K2 Self-Tapping Screw 6x38mm A2 Stainless Steel (Pack of 500)

The trade pack of K2's 6 × 38 mm thread-tapping screw – 500 in a box, which is the quantity a roof of any size actually consumes. It is a non-cutting screw, so it forms its own thread rather than drilling a slug of swarf onto the roof.

Approved for sheet from 0.4 mm to 1.25 mm in both steel and aluminium, in A2 stainless with an EPDM seal. It carries abZ, ETA and MCS certification, which is the one that matters on a UK domestic install.

Where it is used

This is the fixing for K2's trapezoidal sheet metal roof details, including BasicClip. The EPDM washer seals the penetration as the screw pulls down, so the fixing and the weatherproofing are the same operation.

Check the sheet gauge before ordering rather than after: below 0.4 mm the screw has too little material to form a thread in, and above 1.25 mm it is outside what K2 approve.

Pack of 500, or singly

This page is the 500 pack. The identical screw is also stocked as a single unit for topping up a van stock or finishing a job, and that is linked below. Work out the count from the fixing centres in the K2 layout and buy the pack if the job needs more than a couple of hundred – the per-screw cost is lower in the box.

Order alongside

• K2 Self-Tapping Screw 6x38 (single)

  The same screw sold one at a time, for topping up rather than buying another 500.

• K2 BasicRail BasicClip

  The trapezoidal roof clip this screw is certified with.

• K2 Self-Drilling Screw 6.8x140mm

  The long self-drilling alternative, where the fixing has to reach a rafter through battens.

• K2 Basic Rail 22, 2.5m

  The base rail used with BasicClip on a trapezoidal sheet roof.