Coloured 25mm x 4.2mm Wafer Head Self-Tapping Screws
These 25mm x 4.2mm coloured wafer head self-tapping screws are the longer-reach companion to the 19mm, built for fixing panels and graphics boards into deeper timber frames where the additional 6mm of thread engagement makes the difference between a secure hold and a screw that barely grips the frame behind the panel. Thicker panel build-ups, deeper timber battens, and taller hoardings subject to wind loading all demand the reach that the 25mm provides.
The sharp point and 60° self-tapping thread drive directly into softwood battens and stud frames without pre-drilling, and the wafer low-profile head distributes load across a wide bearing surface while sitting flatter against the panel than pan or countersunk heads. On hoarding installations, signage systems, and printed graphics boards, this keeps head protrusion to a minimum so the fixings sit discreetly against the finished surface.
Manufactured from carbon steel with a bright zinc plated (BZP) base and finished in a durable RAL powder coat, each screw head is colour-matched to the panel it sits against. Where fixings are visible across printed hoarding graphics, branded fascias, or colour-specified panels, a colour-matched wafer head disappears into the work - keeping the finish clean and the fixings discreet across the full installation.
41 RAL Colour-Matched Finishes
Every 25mm wafer head screw is electrostatically 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, shopfitting, and graphics applications. Whether you are matching RAL 9016 Traffic White printed hoardings, RAL 9005 Jet Black branded panels, RAL 1015 Light Ivory heritage schemes, or RAL 7016 Anthracite Grey signage frames, 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 branded range - the same self-tapping 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-tapping screws are used wherever a low-profile, colour-matched fix into timber or thin sheet requires deeper thread engagement than the 19mm provides:
- Hoarding on deeper timber frames - taller hoardings, wind-exposed perimeter boards, thicker panel build-ups
- Signage and graphics - large-format printed boards and graphics panels on deep timber battens
- ACM and composite panels - Dibond® and rigid composite boards on timber substructures
- Drywall and partitioning - deeper track fixing and partition framing
- Shopfitting and fit-out - double-skin panels, display systems, and thicker build-up trims
- Ducting and light cladding - deeper ductwork sections, trunking covers, and panel trims
Specification
| Size | 4.2 x 25mm |
| Thread Diameter | 4.2mm |
| Length | 25mm |
| Head Type | Wafer (low profile) |
| Recess Type | Phillips (PH2) |
| Thread Type | 60° self-tapping |
| Point Type | Sharp point |
| Material | Carbon steel |
| Base Finish | Bright Zinc Plated (BZP) |
| Coating | RAL Classic powder coat (electrostatic, oven-cured) |
| Standard | BS 4174:1972 |
| Substrates | Softwood timber, plastics, thin sheet metal |
| Colours Available | 41 stocked RAL colours (any RAL Classic on request) |
Frequently Asked Questions
When should I use 25mm wafer head self-tapping screws instead of 19mm?
The 25mm provides 6mm of additional thread engagement for thicker panel build-ups, deeper timber battens, and assemblies where the 19mm would not reach far enough into the frame behind the panel. Choose 19mm for standard single-skin panels on shallow timber battens; 25mm where the timber frame is deeper, the panel is thicker, or where greater pull-out resistance is needed - for example on taller hoardings or wind-exposed installations.
What is the difference between self-tapping and self-drilling wafer head screws?
A self-tapping screw has a sharp point that forms its own thread as it is driven into the substrate - it works directly into timber, plastics, and thin sheet metal without pre-tapping, but needs a pilot hole in harder metals. A self-drilling screw has an integrated drill point (Tek point) that cuts its own hole before the thread engages, so no pilot hole is required even in steel. Choose self-tapping wafer heads for timber frame hoardings and thin sheet; self-drilling wafer heads for steel and aluminium framework.
What is the difference between these screws and PanelPro HP25?
They are the same 25mm wafer head self-tapping screw. PanelPro™ HP25 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 driver bit do I need for these screws?
These wafer head screws have a Phillips PH2 recess. Use a standard PH2 driver bit at controlled speed - apply firm, steady pressure for a positive drive. Compatible with all cordless drivers and hand screwdrivers.
What materials can these screws fix into?
The sharp point and 60° self-tapping thread drive directly into softwood timber, plastics, and thin sheet metal without pre-drilling. The 25mm length provides deep engagement into timber battens and stud frames. For harder metals or thicker steel, a pilot hole is recommended. For steel and aluminium frameworks where no pilot hole is required, use our self-drilling wafer head screws instead.
Powder Coated Self-Tapping Screws
RALfixings specialise in colour-matched visible fixings for the hoarding, signage, and construction sectors. Every self-tapping 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, 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-tapping screws:
- Scratch resistant - hard cured finish withstands handling, installation, and panel changes
- 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 - RAL colour-matched finish maintains consistency over time
Available RAL Colours
4.2 x 25mm coloured wafer head self-tapping 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-Tapping Screws
These 25mm x 4.2mm coloured wafer head self-tapping screws are the longer-reach companion to the 19mm, built for fixing panels and graphics boards into deeper timber frames where the additional 6mm of thread engagement makes the difference between a secure hold and a screw that barely grips the frame behind the panel. Thicker panel build-ups, deeper timber battens, and taller hoardings subject to wind loading all demand the reach that the 25mm provides.
The sharp point and 60° self-tapping thread drive directly into softwood battens and stud frames without pre-drilling, and the wafer low-profile head distributes load across a wide bearing surface while sitting flatter against the panel than pan or countersunk heads. On hoarding installations, signage systems, and printed graphics boards, this keeps head protrusion to a minimum so the fixings sit discreetly against the finished surface.
Manufactured from carbon steel with a bright zinc plated (BZP) base and finished in a durable RAL powder coat, each screw head is colour-matched to the panel it sits against. Where fixings are visible across printed hoarding graphics, branded fascias, or colour-specified panels, a colour-matched wafer head disappears into the work - keeping the finish clean and the fixings discreet across the full installation.
41 RAL Colour-Matched Finishes
Every 25mm wafer head screw is electrostatically 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, shopfitting, and graphics applications. Whether you are matching RAL 9016 Traffic White printed hoardings, RAL 9005 Jet Black branded panels, RAL 1015 Light Ivory heritage schemes, or RAL 7016 Anthracite Grey signage frames, 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 branded range - the same self-tapping 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-tapping screws are used wherever a low-profile, colour-matched fix into timber or thin sheet requires deeper thread engagement than the 19mm provides:
- Hoarding on deeper timber frames - taller hoardings, wind-exposed perimeter boards, thicker panel build-ups
- Signage and graphics - large-format printed boards and graphics panels on deep timber battens
- ACM and composite panels - Dibond® and rigid composite boards on timber substructures
- Drywall and partitioning - deeper track fixing and partition framing
- Shopfitting and fit-out - double-skin panels, display systems, and thicker build-up trims
- Ducting and light cladding - deeper ductwork sections, trunking covers, and panel trims
Specification
| Size | 4.2 x 25mm |
| Thread Diameter | 4.2mm |
| Length | 25mm |
| Head Type | Wafer (low profile) |
| Recess Type | Phillips (PH2) |
| Thread Type | 60° self-tapping |
| Point Type | Sharp point |
| Material | Carbon steel |
| Base Finish | Bright Zinc Plated (BZP) |
| Coating | RAL Classic powder coat (electrostatic, oven-cured) |
| Standard | BS 4174:1972 |
| Substrates | Softwood timber, plastics, thin sheet metal |
| Colours Available | 41 stocked RAL colours (any RAL Classic on request) |
Frequently Asked Questions
When should I use 25mm wafer head self-tapping screws instead of 19mm?
The 25mm provides 6mm of additional thread engagement for thicker panel build-ups, deeper timber battens, and assemblies where the 19mm would not reach far enough into the frame behind the panel. Choose 19mm for standard single-skin panels on shallow timber battens; 25mm where the timber frame is deeper, the panel is thicker, or where greater pull-out resistance is needed - for example on taller hoardings or wind-exposed installations.
What is the difference between self-tapping and self-drilling wafer head screws?
A self-tapping screw has a sharp point that forms its own thread as it is driven into the substrate - it works directly into timber, plastics, and thin sheet metal without pre-tapping, but needs a pilot hole in harder metals. A self-drilling screw has an integrated drill point (Tek point) that cuts its own hole before the thread engages, so no pilot hole is required even in steel. Choose self-tapping wafer heads for timber frame hoardings and thin sheet; self-drilling wafer heads for steel and aluminium framework.
What is the difference between these screws and PanelPro HP25?
They are the same 25mm wafer head self-tapping screw. PanelPro™ HP25 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 driver bit do I need for these screws?
These wafer head screws have a Phillips PH2 recess. Use a standard PH2 driver bit at controlled speed - apply firm, steady pressure for a positive drive. Compatible with all cordless drivers and hand screwdrivers.
What materials can these screws fix into?
The sharp point and 60° self-tapping thread drive directly into softwood timber, plastics, and thin sheet metal without pre-drilling. The 25mm length provides deep engagement into timber battens and stud frames. For harder metals or thicker steel, a pilot hole is recommended. For steel and aluminium frameworks where no pilot hole is required, use our self-drilling wafer head screws instead.
Powder Coated Self-Tapping Screws
RALfixings specialise in colour-matched visible fixings for the hoarding, signage, and construction sectors. Every self-tapping 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, 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-tapping screws:
- Scratch resistant - hard cured finish withstands handling, installation, and panel changes
- 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 - RAL colour-matched finish maintains consistency over time
Available RAL Colours
4.2 x 25mm coloured wafer head self-tapping 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 Brian F on 18th Dec 2024
We use tonnes of these and RALfixings never let us down.
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Coloured 25mm x 4.2mm Wafer Head Self-Tapping Screws
These 25mm x 4.2mm coloured wafer head self-tapping screws are the longer-reach companion to the 19mm, built for fixing panels and graphics boards into deeper timber frames where the additional 6mm of thread engagement makes the difference between a secure hold and a screw that barely grips the frame behind the panel. Thicker panel build-ups, deeper timber battens, and taller hoardings subject to wind loading all demand the reach that the 25mm provides.
The sharp point and 60° self-tapping thread drive directly into softwood battens and stud frames without pre-drilling, and the wafer low-profile head distributes load across a wide bearing surface while sitting flatter against the panel than pan or countersunk heads. On hoarding installations, signage systems, and printed graphics boards, this keeps head protrusion to a minimum so the fixings sit discreetly against the finished surface.
Manufactured from carbon steel with a bright zinc plated (BZP) base and finished in a durable RAL powder coat, each screw head is colour-matched to the panel it sits against. Where fixings are visible across printed hoarding graphics, branded fascias, or colour-specified panels, a colour-matched wafer head disappears into the work - keeping the finish clean and the fixings discreet across the full installation.
41 RAL Colour-Matched Finishes
Every 25mm wafer head screw is electrostatically 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, shopfitting, and graphics applications. Whether you are matching RAL 9016 Traffic White printed hoardings, RAL 9005 Jet Black branded panels, RAL 1015 Light Ivory heritage schemes, or RAL 7016 Anthracite Grey signage frames, 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 branded range - the same self-tapping 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-tapping screws are used wherever a low-profile, colour-matched fix into timber or thin sheet requires deeper thread engagement than the 19mm provides:
- Hoarding on deeper timber frames - taller hoardings, wind-exposed perimeter boards, thicker panel build-ups
- Signage and graphics - large-format printed boards and graphics panels on deep timber battens
- ACM and composite panels - Dibond® and rigid composite boards on timber substructures
- Drywall and partitioning - deeper track fixing and partition framing
- Shopfitting and fit-out - double-skin panels, display systems, and thicker build-up trims
- Ducting and light cladding - deeper ductwork sections, trunking covers, and panel trims
Specification
| Size | 4.2 x 25mm |
| Thread Diameter | 4.2mm |
| Length | 25mm |
| Head Type | Wafer (low profile) |
| Recess Type | Phillips (PH2) |
| Thread Type | 60° self-tapping |
| Point Type | Sharp point |
| Material | Carbon steel |
| Base Finish | Bright Zinc Plated (BZP) |
| Coating | RAL Classic powder coat (electrostatic, oven-cured) |
| Standard | BS 4174:1972 |
| Substrates | Softwood timber, plastics, thin sheet metal |
| Colours Available | 41 stocked RAL colours (any RAL Classic on request) |
Frequently Asked Questions
When should I use 25mm wafer head self-tapping screws instead of 19mm?
The 25mm provides 6mm of additional thread engagement for thicker panel build-ups, deeper timber battens, and assemblies where the 19mm would not reach far enough into the frame behind the panel. Choose 19mm for standard single-skin panels on shallow timber battens; 25mm where the timber frame is deeper, the panel is thicker, or where greater pull-out resistance is needed - for example on taller hoardings or wind-exposed installations.
What is the difference between self-tapping and self-drilling wafer head screws?
A self-tapping screw has a sharp point that forms its own thread as it is driven into the substrate - it works directly into timber, plastics, and thin sheet metal without pre-tapping, but needs a pilot hole in harder metals. A self-drilling screw has an integrated drill point (Tek point) that cuts its own hole before the thread engages, so no pilot hole is required even in steel. Choose self-tapping wafer heads for timber frame hoardings and thin sheet; self-drilling wafer heads for steel and aluminium framework.
What is the difference between these screws and PanelPro HP25?
They are the same 25mm wafer head self-tapping screw. PanelPro™ HP25 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 driver bit do I need for these screws?
These wafer head screws have a Phillips PH2 recess. Use a standard PH2 driver bit at controlled speed - apply firm, steady pressure for a positive drive. Compatible with all cordless drivers and hand screwdrivers.
What materials can these screws fix into?
The sharp point and 60° self-tapping thread drive directly into softwood timber, plastics, and thin sheet metal without pre-drilling. The 25mm length provides deep engagement into timber battens and stud frames. For harder metals or thicker steel, a pilot hole is recommended. For steel and aluminium frameworks where no pilot hole is required, use our self-drilling wafer head screws instead.
Powder Coated Self-Tapping Screws
RALfixings specialise in colour-matched visible fixings for the hoarding, signage, and construction sectors. Every self-tapping 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, 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-tapping screws:
- Scratch resistant - hard cured finish withstands handling, installation, and panel changes
- 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 - RAL colour-matched finish maintains consistency over time
Available RAL Colours
4.2 x 25mm coloured wafer head self-tapping 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 self-tapping screw, built for fixing panels and graphics boards into deeper timber frames where the additional 6mm of thread engagement makes the difference. Thicker panel build-ups, deeper timber battens, and taller hoardings subject to wind loading all demand the reach that the 25mm provides.
The sharp point and 60° self-tapping thread drive directly into softwood battens and stud frames without pre-drilling. The wafer low-profile head distributes load across a wide bearing surface while sitting flatter against the panel than pan or countersunk heads. The 4.2mm diameter drives quickly with minimal material stress. Drive with a PH2 Phillips bit at controlled speed.
For standard single-skin panels on shallow timber battens where the shorter reach is sufficient, the 19mm wafer head self-tapping screw is the more economical choice. For steel and aluminium frameworks where no pilot hole is required, use our self-drilling wafer head screws. 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+ | ||
