Coloured 25mm x 4.2mm Wafer Head Self-Drilling Screws
These 4.2 x 25mm coloured wafer head self-drilling screws are the longer-reach companion to the 19mm, built for fixing panels and sheet materials to metal framework where layered build-ups, insulation backing, or deeper steel sections put the frame further from the panel face. The integrated self-drilling point penetrates steel up to 3.0mm thick without a pilot hole, and the additional 6mm of shank over the 19mm provides the thread engagement that thicker assemblies demand.
The 11mm low-profile wafer head distributes load across a wide bearing surface while sitting close to flush against the panel - keeping head protrusion to a minimum so printed hoarding graphics, branded fascias, and colour-specified panels read cleanly across the fixings. The 4.2mm diameter drives quickly with less material stress than heavier 4.8mm screws, giving clean results at speed across large panel runs.
Manufactured from carbon steel with a bright zinc plated (BZP) base, certified to BS EN 14566 and BS EN 10666 with an Euroclass A1 fire rating. Each screw is powder-coated in-house to a RAL Classic colour standard, so the wafer head colour-matches the panel it sits against - eliminating the row of zinc dots that gives away every fixing point on an otherwise clean installation.
41 RAL Colour-Matched Finishes
Every 4.2 x 25mm wafer head screw is electro-statically powder-coated and oven-cured to a RAL Classic colour standard. The result is a hard, uniform finish bonded directly to the screw head - resistant to scratching, chipping, UV fading, and general site wear. Unlike wet paint, powder coat will not peel, blister, or thin at edges over time, even on exposed hoarding installations subject to weather and repeated panel changes.
With 41 stocked RAL colours spanning whites, greys, blacks, blues, greens, reds, yellows, browns, and purples, these coloured wafer head screws cover the most commonly specified colours across hoarding, signage, framing, and light cladding applications. Whether you are matching RAL 9016 Traffic White printed hoardings, RAL 9005 Jet Black branded panels, RAL 7016 Anthracite Grey facade elements, or RAL 5012 Light Blue corporate graphics, the right colour is available for immediate dispatch.
For our most popular hoarding colours in project-ready packs with dedicated technical specs, see the PanelPro™ HP25-SD branded range - the same self-drilling screw optimised for hoarding procurement. For anything outside those colours, or when ordering per screw to a specific RAL reference, this is the product to use.
Need a RAL colour outside the stocked range? We hold over 400 RAL Classic powders and can coat to any colour on request. Contact us with your RAL reference for availability and lead times.
Common Applications
4.2 x 25mm coloured wafer head self-drilling screws are used wherever a low-profile, colour-matched fix into metal requires deeper thread engagement than the 19mm provides:
- Hoarding on metal frames - panels to steel and aluminium hoarding systems, multi-site installations
- ACM and composite panels - Dibond®, aluminium composite, and rigid boards on metal carriers
- Metal stud framing - deeper stud-to-track connections and layered assemblies
- Signage and fascia systems - sign trays, fascia frames, and branded panel fixings on steel
- Ducting and M&E installations - deeper ductwork sections, cable containment, and services
- Aluminium sub-frames - steel and aluminium box frames where no pre-drill is required
Specification
| Size | 4.2 x 25mm |
| Thread Diameter | 4.2mm |
| Length | 25mm |
| Max Drilling Thickness (MDT) | 3.0mm |
| Head Type | Wafer (low profile) |
| Head Diameter | 11mm |
| Recess Type | Phillips (PH2) |
| Thread Type | Self-tapping |
| Point Type | Self-drilling |
| Material | Carbon steel |
| Base Finish | Bright Zinc Plated (BZP) |
| Coating | RAL Classic powder coat (electrostatic, oven-cured) |
| Standards | BS EN 14566 & BS EN 10666 |
| Fire Classification | Euroclass A1 (non-combustible) |
| Substrates | Light-gauge steel, aluminium, thin sheet metal (up to 3mm) |
| Colours Available | 41 stocked RAL colours (any RAL Classic on request) |
Frequently Asked Questions
When should I use 25mm wafer head self-drilling screws instead of 19mm or 13mm?
The 25mm provides additional thread engagement for layered materials, insulation backing, deeper steel sections, and thicker panel build-ups where the 19mm or 13mm would not reach far enough into the frame. Choose 13mm for the thinnest track stitching with minimal protrusion; 19mm for standard single-skin sheet fixing; and 25mm where there is material build-up between the panel face and the steel, or where greater pull-out resistance is needed.
What thickness of steel can these screws drill through?
The self-drilling point penetrates steel up to 3.0mm thick without a pilot hole. Beyond 3mm, pre-drill the section first. Drill at speed and ease off as the wafer head seats to avoid stripping the metal thread.
What is the difference between these screws and PanelPro HP25-SD?
They are the same 25mm wafer head self-drilling screw. PanelPro™ HP25-SD is our branded hoarding range, sold in project-ready packs with dedicated colour charts and technical specification sheets. This product offers the same screw powder-coated to any of 41 stocked RAL colours - ideal when you need a specific RAL match outside the PanelPro range, or when ordering per screw rather than by the pack.
What is the difference between a wafer head and a flange head screw?
Both head types sit low and distribute load across a wide area, but they differ in profile and application. A wafer head is thinner and flatter - sitting closer to flush against the surface - making it the better choice where minimal head protrusion is critical, such as hoarding panels where graphics need to read cleanly across the fixings. A flange head stands slightly higher with a more pronounced washer effect, providing greater pull-through resistance on thin panels. Choose wafer for hoarding, stitching, and minimal protrusion; flange for panel clamping on trims and cladding.
What driver bit do I need for these screws?
These wafer head screws have a Phillips PH2 recess. Use a standard PH2 driver bit - drill at speed through the steel and ease off as the head seats. Compatible with all cordless drivers and hand screwdrivers.
Powder Coated Self-Drilling Screws
RALfixings specialise in colour-matched visible fixings for the hoarding, signage, and construction sectors. Every self-drilling screw is powder-coated in-house using an electrostatic spray process, then oven-cured at 200°C to produce a hard, even finish that bonds directly to the screw head.
Powder coating outperforms wet paint in every measurable way. The electrostatically charged powder particles wrap around the low-profile wafer head and into the Phillips recess, building a consistent film thickness that liquid paint cannot replicate. On hoarding installations where fixings are visible at regular intervals across printed graphics, batch-to-batch colour consistency is what keeps the finish clean. The cured finish is harder, more flexible, and far more resistant to impact, abrasion, and chemical exposure than paint, standing up to outdoor exposure, repeated handling, and long-term use on site.
Benefits of powder coated self-drilling screws:
- Scratch resistant - hard cured finish withstands handling, installation, and site wear
- Rust resistant - BZP base plus powder coat provides dual corrosion protection
- UV resistant - colour stays true with no fading or chalking
- Weather resistant - will not peel, blister, or crack in exterior conditions
- Colourfast - consistent colour across production runs and pack sizes
Available RAL Colours
4.2 x 25mm coloured wafer head self-drilling screws are stocked in the following 41 RAL Classic colours. Select your colour from the dropdown above, or view the full RALfixings colour guide for additional RAL colours available on request.
- RAL 1013 Oyster White
- RAL 1015 Light Ivory
- RAL 1016 Sulphur Yellow
- RAL 1019 Grey Beige
- RAL 1020 Olive Yellow
- RAL 1023 Traffic Yellow
- RAL 1033 Dahlia Yellow
- RAL 1036 Pearl Gold
- RAL 3002 Carmine Red
- RAL 3004 Purple Red
- RAL 3009 Oxide Red
- RAL 3020 Traffic Red
- RAL 4006 Traffic Purple
- RAL 4007 Violet Purple
- RAL 4010 Telemagenta
- RAL 5003 Sapphire Blue
- RAL 5004 Black Blue
- RAL 5012 Light Blue
- RAL 5013 Cobalt Blue
- RAL 5023 Distant Blue
- RAL 5024 Pastel Blue
- RAL 6003 Olive Green
- RAL 6005 Moss Green
- RAL 6009 Fir Green
- RAL 6012 Black Green
- RAL 6016 Turquoise Green
- RAL 6024 Traffic Green
- RAL 6025 Fern Green
- RAL 6027 Light Green
- RAL 7009 Green Grey
- RAL 7016 Anthracite Grey
- RAL 7032 Pebble Grey
- RAL 7035 Light Grey
- RAL 7038 Agate Grey
- RAL 7042 Traffic Grey A
- RAL 8004 Copper Brown
- RAL 8008 Olive Brown
- RAL 8019 Grey Brown
- RAL 9005 Jet Black
- RAL 9010 Pure White
- RAL 9016 Traffic White
Coloured 25mm x 4.2mm Wafer Head Self-Drilling Screws
These 4.2 x 25mm coloured wafer head self-drilling screws are the longer-reach companion to the 19mm, built for fixing panels and sheet materials to metal framework where layered build-ups, insulation backing, or deeper steel sections put the frame further from the panel face. The integrated self-drilling point penetrates steel up to 3.0mm thick without a pilot hole, and the additional 6mm of shank over the 19mm provides the thread engagement that thicker assemblies demand.
The 11mm low-profile wafer head distributes load across a wide bearing surface while sitting close to flush against the panel - keeping head protrusion to a minimum so printed hoarding graphics, branded fascias, and colour-specified panels read cleanly across the fixings. The 4.2mm diameter drives quickly with less material stress than heavier 4.8mm screws, giving clean results at speed across large panel runs.
Manufactured from carbon steel with a bright zinc plated (BZP) base, certified to BS EN 14566 and BS EN 10666 with an Euroclass A1 fire rating. Each screw is powder-coated in-house to a RAL Classic colour standard, so the wafer head colour-matches the panel it sits against - eliminating the row of zinc dots that gives away every fixing point on an otherwise clean installation.
41 RAL Colour-Matched Finishes
Every 4.2 x 25mm wafer head screw is electro-statically powder-coated and oven-cured to a RAL Classic colour standard. The result is a hard, uniform finish bonded directly to the screw head - resistant to scratching, chipping, UV fading, and general site wear. Unlike wet paint, powder coat will not peel, blister, or thin at edges over time, even on exposed hoarding installations subject to weather and repeated panel changes.
With 41 stocked RAL colours spanning whites, greys, blacks, blues, greens, reds, yellows, browns, and purples, these coloured wafer head screws cover the most commonly specified colours across hoarding, signage, framing, and light cladding applications. Whether you are matching RAL 9016 Traffic White printed hoardings, RAL 9005 Jet Black branded panels, RAL 7016 Anthracite Grey facade elements, or RAL 5012 Light Blue corporate graphics, the right colour is available for immediate dispatch.
For our most popular hoarding colours in project-ready packs with dedicated technical specs, see the PanelPro™ HP25-SD branded range - the same self-drilling screw optimised for hoarding procurement. For anything outside those colours, or when ordering per screw to a specific RAL reference, this is the product to use.
Need a RAL colour outside the stocked range? We hold over 400 RAL Classic powders and can coat to any colour on request. Contact us with your RAL reference for availability and lead times.
Common Applications
4.2 x 25mm coloured wafer head self-drilling screws are used wherever a low-profile, colour-matched fix into metal requires deeper thread engagement than the 19mm provides:
- Hoarding on metal frames - panels to steel and aluminium hoarding systems, multi-site installations
- ACM and composite panels - Dibond®, aluminium composite, and rigid boards on metal carriers
- Metal stud framing - deeper stud-to-track connections and layered assemblies
- Signage and fascia systems - sign trays, fascia frames, and branded panel fixings on steel
- Ducting and M&E installations - deeper ductwork sections, cable containment, and services
- Aluminium sub-frames - steel and aluminium box frames where no pre-drill is required
Specification
| Size | 4.2 x 25mm |
| Thread Diameter | 4.2mm |
| Length | 25mm |
| Max Drilling Thickness (MDT) | 3.0mm |
| Head Type | Wafer (low profile) |
| Head Diameter | 11mm |
| Recess Type | Phillips (PH2) |
| Thread Type | Self-tapping |
| Point Type | Self-drilling |
| Material | Carbon steel |
| Base Finish | Bright Zinc Plated (BZP) |
| Coating | RAL Classic powder coat (electrostatic, oven-cured) |
| Standards | BS EN 14566 & BS EN 10666 |
| Fire Classification | Euroclass A1 (non-combustible) |
| Substrates | Light-gauge steel, aluminium, thin sheet metal (up to 3mm) |
| Colours Available | 41 stocked RAL colours (any RAL Classic on request) |
Frequently Asked Questions
When should I use 25mm wafer head self-drilling screws instead of 19mm or 13mm?
The 25mm provides additional thread engagement for layered materials, insulation backing, deeper steel sections, and thicker panel build-ups where the 19mm or 13mm would not reach far enough into the frame. Choose 13mm for the thinnest track stitching with minimal protrusion; 19mm for standard single-skin sheet fixing; and 25mm where there is material build-up between the panel face and the steel, or where greater pull-out resistance is needed.
What thickness of steel can these screws drill through?
The self-drilling point penetrates steel up to 3.0mm thick without a pilot hole. Beyond 3mm, pre-drill the section first. Drill at speed and ease off as the wafer head seats to avoid stripping the metal thread.
What is the difference between these screws and PanelPro HP25-SD?
They are the same 25mm wafer head self-drilling screw. PanelPro™ HP25-SD is our branded hoarding range, sold in project-ready packs with dedicated colour charts and technical specification sheets. This product offers the same screw powder-coated to any of 41 stocked RAL colours - ideal when you need a specific RAL match outside the PanelPro range, or when ordering per screw rather than by the pack.
What is the difference between a wafer head and a flange head screw?
Both head types sit low and distribute load across a wide area, but they differ in profile and application. A wafer head is thinner and flatter - sitting closer to flush against the surface - making it the better choice where minimal head protrusion is critical, such as hoarding panels where graphics need to read cleanly across the fixings. A flange head stands slightly higher with a more pronounced washer effect, providing greater pull-through resistance on thin panels. Choose wafer for hoarding, stitching, and minimal protrusion; flange for panel clamping on trims and cladding.
What driver bit do I need for these screws?
These wafer head screws have a Phillips PH2 recess. Use a standard PH2 driver bit - drill at speed through the steel and ease off as the head seats. Compatible with all cordless drivers and hand screwdrivers.
Powder Coated Self-Drilling Screws
RALfixings specialise in colour-matched visible fixings for the hoarding, signage, and construction sectors. Every self-drilling screw is powder-coated in-house using an electrostatic spray process, then oven-cured at 200°C to produce a hard, even finish that bonds directly to the screw head.
Powder coating outperforms wet paint in every measurable way. The electrostatically charged powder particles wrap around the low-profile wafer head and into the Phillips recess, building a consistent film thickness that liquid paint cannot replicate. On hoarding installations where fixings are visible at regular intervals across printed graphics, batch-to-batch colour consistency is what keeps the finish clean. The cured finish is harder, more flexible, and far more resistant to impact, abrasion, and chemical exposure than paint, standing up to outdoor exposure, repeated handling, and long-term use on site.
Benefits of powder coated self-drilling screws:
- Scratch resistant - hard cured finish withstands handling, installation, and site wear
- Rust resistant - BZP base plus powder coat provides dual corrosion protection
- UV resistant - colour stays true with no fading or chalking
- Weather resistant - will not peel, blister, or crack in exterior conditions
- Colourfast - consistent colour across production runs and pack sizes
Available RAL Colours
4.2 x 25mm coloured wafer head self-drilling screws are stocked in the following 41 RAL Classic colours. Select your colour from the dropdown above, or view the full RALfixings colour guide for additional RAL colours available on request.
- RAL 1013 Oyster White
- RAL 1015 Light Ivory
- RAL 1016 Sulphur Yellow
- RAL 1019 Grey Beige
- RAL 1020 Olive Yellow
- RAL 1023 Traffic Yellow
- RAL 1033 Dahlia Yellow
- RAL 1036 Pearl Gold
- RAL 3002 Carmine Red
- RAL 3004 Purple Red
- RAL 3009 Oxide Red
- RAL 3020 Traffic Red
- RAL 4006 Traffic Purple
- RAL 4007 Violet Purple
- RAL 4010 Telemagenta
- RAL 5003 Sapphire Blue
- RAL 5004 Black Blue
- RAL 5012 Light Blue
- RAL 5013 Cobalt Blue
- RAL 5023 Distant Blue
- RAL 5024 Pastel Blue
- RAL 6003 Olive Green
- RAL 6005 Moss Green
- RAL 6009 Fir Green
- RAL 6012 Black Green
- RAL 6016 Turquoise Green
- RAL 6024 Traffic Green
- RAL 6025 Fern Green
- RAL 6027 Light Green
- RAL 7009 Green Grey
- RAL 7016 Anthracite Grey
- RAL 7032 Pebble Grey
- RAL 7035 Light Grey
- RAL 7038 Agate Grey
- RAL 7042 Traffic Grey A
- RAL 8004 Copper Brown
- RAL 8008 Olive Brown
- RAL 8019 Grey Brown
- RAL 9005 Jet Black
- RAL 9010 Pure White
- RAL 9016 Traffic White
Delivery & Shipping Terms
1. Where We Deliver
We currently ship to addresses within the United Kingdom only.
If you require delivery outside the UK, this must be arranged in advance. Where international delivery is agreed:
- You are fully responsible for all import duties, taxes, and customs charges, including any fees for customs paperwork.
- RALfixings accepts no liability for customs delays or additional costs associated with international shipments.
2. Delivery Timescales
Our products fall into two categories: in-stock and made-to-order (bespoke) items.
In-Stock Items
- Usually dispatched within 1–2 working days.
- Delivery typically takes 1–3 working days from the dispatch date.
Powder Coated / Made-to-Order Items
- Typically dispatched within 3–5 working days, but may take up to 10 working days during busy periods.
- Delivery typically takes 1–3 working days after dispatch.
All quoted times are estimates, not guarantees. Delivery times may be affected by stock availability, courier performance, weather, or other factors beyond our control.
3. Shipping Costs
- Shipping charges are based on order weight and destination.
- The exact shipping cost will be shown at checkout before payment.
- Additional shipping charges may apply to remote areas or multiple consignments.
4. Tracking and Responsibility
All orders are shipped via tracked courier services to ensure maximum security and visibility.
Once your order has been dispatched:
- You will receive an order dispatch email letting you know your order is on it's way, and another email from Royal Mail or the chosen courier with your tracking information. If you have supplied a UK phone number you may also recieve a tracking text from Royal Mail or the chosen courier.
- Responsibility for the goods passes to you upon dispatch.
- RALfixings is not liable for loss or damage in transit. Please contact the courier directly with your tracking number if issues arise.
5. Missed Deliveries or Delays
If your parcel cannot be delivered and is returned to us:
- We can resend it, but an additional delivery charge will apply.
- We are not responsible for courier delays or failed delivery attempts.
If your order hasn’t arrived within the estimated delivery window, please contact us as soon as possible at info@ralfixings.com.
Order Amendments & Cancellations
Changing an Order
We begin preparing orders quickly — especially made-to-order items.
- If you need to amend your order, please contact us within 24 hours or as soon as possible.
- After this period, it may be too late to make changes as your order may already be in production or dispatched.
- If you wish to add items, and your order hasn’t yet shipped, we may be able to combine them. Otherwise, a new order (and delivery charge) will apply.
Returns & Refunds
1. Your Right to Cancel – B2C Customers Only
Under the Consumer Contracts Regulations 2013, B2C customers have the right to cancel certain purchases made online within 14 days of delivery.
However, this does not apply to:
- Bespoke or made-to-order goods — including all powder coated screws and fixings manufactured specifically for your order.
If your order includes stocked items only, you may cancel and return those goods within 14 days of receipt. You must:
- Inform us in writing via email within 14 days.
- Return the goods at your own cost, in their original condition and packaging.
- Ensure the items are received by us within 30 days of delivery.
We recommend using a tracked and insured delivery service for any returns, as we are not responsible for items lost or damaged in return transit.
2. Faulty or Incorrect Items
If you receive goods that are:
- Faulty, or
- Incorrectly supplied (e.g. wrong size, colour, or product)
Please notify us within 30 days of receiving the goods.
We will:
- Replace the items where possible, or
- Issue a refund if replacement is not appropriate.
You may be asked to return the faulty items for inspection before a refund or exchange is processed.
Once screws have been installed or used, they cannot be returned or refunded, unless faulty.
3. Refund Processing
- Refunds (where applicable) are processed within 5 working days of receiving the returned items.
- Refunds are only issued to the original payment method.
- Refunds cannot be made to a different card or by other means.
- Delivery charges are non-refundable unless your entire order was cancelled before dispatch or the goods were faulty or incorrect.
Returns Address
To return items, please send them to:
FAO: Jon Lett
RALfixings Ltd
26a Queens Road
Knaphill
Surrey
GU212DX
B2B Orders & Restocking Fee
The rights described above apply primarily to consumers (B2C). If you are a business customer (B2B), statutory cancellation rights under the Consumer Contracts Regulations do not apply.
Returns from business customers are accepted at our sole discretion, and only if agreed in writing before the goods are returned.
All authorised B2B returns are subject to a 15% restocking fee, which will be deducted from the final refund amount. This fee covers the cost of inspection, repackaging, and administrative processing.
Returned goods must be:
- In resaleable, unused condition
- In their original packaging
- Returned at the buyer’s expense via a tracked delivery service
We do not accept returns of any bespoke or made-to-order products under any circumstances unless the item is faulty.
What our customers say
Posted by Jaffe on 17th Jan 2025
Does what it says on the tin. Quality screws with nice paint that doesn't chip and matches the colour we need. Will use RALfixings again when I need coloured screws
Posted by Pro X on 26th Nov 2024
Fantastic quality - perfect for our install.
SIMPLE TEST - CAN YOU SEE THIS?
If you see this, the partial is loading.
Coloured 25mm x 4.2mm Wafer Head Self-Drilling Screws
These 4.2 x 25mm coloured wafer head self-drilling screws are the longer-reach companion to the 19mm, built for fixing panels and sheet materials to metal framework where layered build-ups, insulation backing, or deeper steel sections put the frame further from the panel face. The integrated self-drilling point penetrates steel up to 3.0mm thick without a pilot hole, and the additional 6mm of shank over the 19mm provides the thread engagement that thicker assemblies demand.
The 11mm low-profile wafer head distributes load across a wide bearing surface while sitting close to flush against the panel - keeping head protrusion to a minimum so printed hoarding graphics, branded fascias, and colour-specified panels read cleanly across the fixings. The 4.2mm diameter drives quickly with less material stress than heavier 4.8mm screws, giving clean results at speed across large panel runs.
Manufactured from carbon steel with a bright zinc plated (BZP) base, certified to BS EN 14566 and BS EN 10666 with an Euroclass A1 fire rating. Each screw is powder-coated in-house to a RAL Classic colour standard, so the wafer head colour-matches the panel it sits against - eliminating the row of zinc dots that gives away every fixing point on an otherwise clean installation.
41 RAL Colour-Matched Finishes
Every 4.2 x 25mm wafer head screw is electro-statically powder-coated and oven-cured to a RAL Classic colour standard. The result is a hard, uniform finish bonded directly to the screw head - resistant to scratching, chipping, UV fading, and general site wear. Unlike wet paint, powder coat will not peel, blister, or thin at edges over time, even on exposed hoarding installations subject to weather and repeated panel changes.
With 41 stocked RAL colours spanning whites, greys, blacks, blues, greens, reds, yellows, browns, and purples, these coloured wafer head screws cover the most commonly specified colours across hoarding, signage, framing, and light cladding applications. Whether you are matching RAL 9016 Traffic White printed hoardings, RAL 9005 Jet Black branded panels, RAL 7016 Anthracite Grey facade elements, or RAL 5012 Light Blue corporate graphics, the right colour is available for immediate dispatch.
For our most popular hoarding colours in project-ready packs with dedicated technical specs, see the PanelPro™ HP25-SD branded range - the same self-drilling screw optimised for hoarding procurement. For anything outside those colours, or when ordering per screw to a specific RAL reference, this is the product to use.
Need a RAL colour outside the stocked range? We hold over 400 RAL Classic powders and can coat to any colour on request. Contact us with your RAL reference for availability and lead times.
Common Applications
4.2 x 25mm coloured wafer head self-drilling screws are used wherever a low-profile, colour-matched fix into metal requires deeper thread engagement than the 19mm provides:
- Hoarding on metal frames - panels to steel and aluminium hoarding systems, multi-site installations
- ACM and composite panels - Dibond®, aluminium composite, and rigid boards on metal carriers
- Metal stud framing - deeper stud-to-track connections and layered assemblies
- Signage and fascia systems - sign trays, fascia frames, and branded panel fixings on steel
- Ducting and M&E installations - deeper ductwork sections, cable containment, and services
- Aluminium sub-frames - steel and aluminium box frames where no pre-drill is required
Specification
| Size | 4.2 x 25mm |
| Thread Diameter | 4.2mm |
| Length | 25mm |
| Max Drilling Thickness (MDT) | 3.0mm |
| Head Type | Wafer (low profile) |
| Head Diameter | 11mm |
| Recess Type | Phillips (PH2) |
| Thread Type | Self-tapping |
| Point Type | Self-drilling |
| Material | Carbon steel |
| Base Finish | Bright Zinc Plated (BZP) |
| Coating | RAL Classic powder coat (electrostatic, oven-cured) |
| Standards | BS EN 14566 & BS EN 10666 |
| Fire Classification | Euroclass A1 (non-combustible) |
| Substrates | Light-gauge steel, aluminium, thin sheet metal (up to 3mm) |
| Colours Available | 41 stocked RAL colours (any RAL Classic on request) |
Frequently Asked Questions
When should I use 25mm wafer head self-drilling screws instead of 19mm or 13mm?
The 25mm provides additional thread engagement for layered materials, insulation backing, deeper steel sections, and thicker panel build-ups where the 19mm or 13mm would not reach far enough into the frame. Choose 13mm for the thinnest track stitching with minimal protrusion; 19mm for standard single-skin sheet fixing; and 25mm where there is material build-up between the panel face and the steel, or where greater pull-out resistance is needed.
What thickness of steel can these screws drill through?
The self-drilling point penetrates steel up to 3.0mm thick without a pilot hole. Beyond 3mm, pre-drill the section first. Drill at speed and ease off as the wafer head seats to avoid stripping the metal thread.
What is the difference between these screws and PanelPro HP25-SD?
They are the same 25mm wafer head self-drilling screw. PanelPro™ HP25-SD is our branded hoarding range, sold in project-ready packs with dedicated colour charts and technical specification sheets. This product offers the same screw powder-coated to any of 41 stocked RAL colours - ideal when you need a specific RAL match outside the PanelPro range, or when ordering per screw rather than by the pack.
What is the difference between a wafer head and a flange head screw?
Both head types sit low and distribute load across a wide area, but they differ in profile and application. A wafer head is thinner and flatter - sitting closer to flush against the surface - making it the better choice where minimal head protrusion is critical, such as hoarding panels where graphics need to read cleanly across the fixings. A flange head stands slightly higher with a more pronounced washer effect, providing greater pull-through resistance on thin panels. Choose wafer for hoarding, stitching, and minimal protrusion; flange for panel clamping on trims and cladding.
What driver bit do I need for these screws?
These wafer head screws have a Phillips PH2 recess. Use a standard PH2 driver bit - drill at speed through the steel and ease off as the head seats. Compatible with all cordless drivers and hand screwdrivers.
Powder Coated Self-Drilling Screws
RALfixings specialise in colour-matched visible fixings for the hoarding, signage, and construction sectors. Every self-drilling screw is powder-coated in-house using an electrostatic spray process, then oven-cured at 200°C to produce a hard, even finish that bonds directly to the screw head.
Powder coating outperforms wet paint in every measurable way. The electrostatically charged powder particles wrap around the low-profile wafer head and into the Phillips recess, building a consistent film thickness that liquid paint cannot replicate. On hoarding installations where fixings are visible at regular intervals across printed graphics, batch-to-batch colour consistency is what keeps the finish clean. The cured finish is harder, more flexible, and far more resistant to impact, abrasion, and chemical exposure than paint, standing up to outdoor exposure, repeated handling, and long-term use on site.
Benefits of powder coated self-drilling screws:
- Scratch resistant - hard cured finish withstands handling, installation, and site wear
- Rust resistant - BZP base plus powder coat provides dual corrosion protection
- UV resistant - colour stays true with no fading or chalking
- Weather resistant - will not peel, blister, or crack in exterior conditions
- Colourfast - consistent colour across production runs and pack sizes
Available RAL Colours
4.2 x 25mm coloured wafer head self-drilling screws are stocked in the following 41 RAL Classic colours. Select your colour from the dropdown above, or view the full RALfixings colour guide for additional RAL colours available on request.
- RAL 1013 Oyster White
- RAL 1015 Light Ivory
- RAL 1016 Sulphur Yellow
- RAL 1019 Grey Beige
- RAL 1020 Olive Yellow
- RAL 1023 Traffic Yellow
- RAL 1033 Dahlia Yellow
- RAL 1036 Pearl Gold
- RAL 3002 Carmine Red
- RAL 3004 Purple Red
- RAL 3009 Oxide Red
- RAL 3020 Traffic Red
- RAL 4006 Traffic Purple
- RAL 4007 Violet Purple
- RAL 4010 Telemagenta
- RAL 5003 Sapphire Blue
- RAL 5004 Black Blue
- RAL 5012 Light Blue
- RAL 5013 Cobalt Blue
- RAL 5023 Distant Blue
- RAL 5024 Pastel Blue
- RAL 6003 Olive Green
- RAL 6005 Moss Green
- RAL 6009 Fir Green
- RAL 6012 Black Green
- RAL 6016 Turquoise Green
- RAL 6024 Traffic Green
- RAL 6025 Fern Green
- RAL 6027 Light Green
- RAL 7009 Green Grey
- RAL 7016 Anthracite Grey
- RAL 7032 Pebble Grey
- RAL 7035 Light Grey
- RAL 7038 Agate Grey
- RAL 7042 Traffic Grey A
- RAL 8004 Copper Brown
- RAL 8008 Olive Brown
- RAL 8019 Grey Brown
- RAL 9005 Jet Black
- RAL 9010 Pure White
- RAL 9016 Traffic White
Recommended applications
The longer-reach companion to the 19mm wafer head, built for colour-matched fixing into metal framework where layered build-ups, insulation backing, or deeper steel sections put the frame further from the panel face. The additional 6mm of shank over the 19mm provides the thread engagement that thicker assemblies demand, while the same low-profile wafer head keeps fixings discreet against printed graphics and branded panels.
The integrated self-drilling point penetrates steel up to 3.0mm without a pilot hole. The 11mm wafer head distributes load across a wide bearing surface while sitting close to flush. The 4.2mm diameter drives quickly with less material stress than heavier 4.8mm screws. Drive with a PH2 Phillips bit — drill at speed and ease off as the head seats to avoid stripping.
For standard single-skin sheet fixing where the shorter reach is sufficient, the 19mm wafer head is the more economical choice. For the thinnest track stitching with minimal protrusion, use the 13mm. Where panel clamping force matters more than minimal protrusion, consider our flange head self-tapping screws.
Suitable for
In Stock
| Bulk Discount | ||
|---|---|---|
| 200+ | ||
| 500+ | ||
| 1000+ | ||
| 2000+ | ||
| 5000+ | ||
