A4 SS *BRN* TX25 RSD CSK Deck Screws 5.0x50

A4 SS TX25 Raised Decking Screws 5.0mm x 50mm Burnished

Premium decking screw with reduced diameter head

Milling ribs and cutting point for easy insertion

Made from burnished brown A4 stainless steel

ORDER BY 3PM FOR NEXT DAY DELIVERY (MON-FRI)*

ORDER BY 3PM FOR NEXT DAY DELIVERY*

FREE STANDARD DELIVERY ON ORDERS OVER £100*

FREE STANDARD DELIVERY OVER £100*

Description
Delivery

RSD Countersunk Head Timber Screws with Cutting Point and Milling Ribs – A2 & A4 Stainless Steel

High-performance timber screws with a countersunk head, designed for strong, clean fixing in wood with reduced installation effort. Available in A2 and A4 stainless steel to suit both general outdoor and more aggressive environments.

Why Choose RSD Countersunk Head Timber Screws?

Key features

• Countersunk head for a flush, tidy finish in timber
• Cutting point helps reduce splitting and improves thread start
• Milling ribs on the shank lower driving resistance
• Ribs under the head assist clean countersinking
• Torx (TX) drive for secure bit grip and efficient torque transfer
• Stainless steel options: A2 for general use, A4 for higher corrosion resistance

Typical applications

• Timber framing and structural joinery
• Decking, fencing and landscaping timber
• Cladding and external woodwork
• Garden buildings, pergolas and outdoor structures
• Coastal or exposed sites where stainless steel is required

Practical benefits

These screws are designed to speed up installation while maintaining a reliable hold. The cutting point improves penetration and reduces the chance of timber splitting. Milling ribs reduce torque, making driving easier and helping the screw pull materials together effectively. Ribs beneath the head support smooth countersinking for a neat surface finish.

Choice of stainless grade allows the fixing to match the environment, with A4 providing increased protection in coastal and high-moisture conditions.

RSD Countersunk Head Timber Screws FAQ's

What are RSD countersunk timber screws?
They are wood screws with a countersunk head, cutting point and milling ribs, designed to improve driving performance and reduce splitting in timber.

Do these screws need pre-drilling?
In many softwoods and some hardwoods, pre-drilling is not required. For dense hardwoods, pilot holes are still recommended.

What drive type do these screws use?
They use a Torx (TX) drive, which gives better bit engagement and reduces cam-out during installation.

Which stainless grade should I choose?
A2 stainless steel suits most general outdoor applications. A4 should be used in coastal areas or where exposure to moisture and corrosive conditions is higher.

Are these suitable for hardwood?
Yes, the cutting point and milling ribs improve performance in hardwood, though pre-drilling may be needed in very dense timber.

Specifics

Thread diameter (d): 5mm
Overall length (l): 50mm
Thread length (b): 30mm
Head diameter (dk): 7.5mm
Head height (k)t: 3.45mm
Torx recess (TX): TX25
Material: A4 Stainless steel

technical line drawing of a2 stainless steel self drilling torx drive timber screws

Delivery Terms

Orders over £100 will qualify for free 2-3 working day delivery*. Orders under £100 will be subject to a carriage charge - please see below for our delivery options.

We offer a number of different nationwide* services. Please see below for our delivery options.

*Please note that orders to the Isle of Wight, the Isle of Man, the Scottish Isles, the Scottish Highlands, Northern Ireland and the Channel Isles will incur a carriage surcharge.

*Long items greater than or equal to 1.5M in length will be subject to a length surcharge of £12. This surcharge is per shipment, and not per item.

Orders placed before 15:00 with next working day/timed services, Saturday & Royal Mail Special Delivery services will be dispatched the same day (Monday to Friday). Orders placed with any of these services after 15:00 will not be dispatched until the next working day. Orders placed on Saturdays, Sundays or bank holidays will be dispatched on the next working day. Next working day means Monday - Friday, excluding bank holidays. Orders placed with any of the aforementioned services will not be delivered on a Saturday or Sunday. For Saturday deliveries, select 'Saturday Delivery' in the basket.

We aim to despatch all orders with standard services within 2 working days, as long as all of the items are in stock.

Delivery Services

We offer the following delivery services:

Royal Mail standard tracked (3-5 working days) £4.99^^
Royal Mail 24 tracked (1-3 working days) £5.99^^
R/Mail Special Delivery next working day by 1pm^ £14.99^^
R/Mail Special Delivery next working day by 9am^ £39.98^^
Standard courier 2-3 working days £6.98
Express 1-2 working working day^ £8.99
Next working day by 13:00^ £10.99
Next working day by 11:00^ £14.99
DPD Saturday delivery^ £9.98

^Orders placed before 15:00 with next working day/timed services, Saturday & Royal Mail Special Delivery services will be dispatched the same day (Monday to Friday). Orders placed after 15:00 will not be dispatched until the next working day. Orders placed on Saturdays, Sundays or bank holidays will be dispatched on the next working day. Next working day means Monday - Friday, excluding bank holidays. Orders placed with any of the aforementioned services will not be delivered on a Saturday or Sunday. For Saturday deliveries, select 'Saturday Delivery' in the basket.

^^Royal Mail services are only offered to basket weights up to and including 2 kilos only. The 1pm & 9am Special Delivery times are for UK mainland only and will vary for Northern Ireland, Highlands & Islands. Please view the Royal Mail website for full details.

Please note that orders to the Isle of Wight, the Isle of Man, the Scottish Isles, the Scottish Highlands, Northern Ireland and the Channel Isles will incur a carriage surcharge.

Long items greater than or equal to 1.5M in length will be subject to a length surcharge of £12. This surcharge is per shipment, and not per item.

Collection

All orders are available for collection from our stores. Collection orders will normally be ready within 2 hours of the order being placed, as long as all items are in stock at the time of order.

Van Delivery

TC Fixings offers a free van delivery service to Saffron Walden and the surrounding villages.