• Self-drilling No.2 Reduced point with a tapered shank. It cuts its own hole, so you skip the pre-drill step.
• 16mm EPDM sealing washer included. It squashes down under the head and seals the fixing against rain.
• Hex head takes an 8mm socket. Easy to drive with a nut runner or impact driver.
• Case and core hardened carbon steel for the bite you need to drill thin steel.
• 60 degree tapered self-tapping thread, fully threaded, so it grips both sheets.
• Exterior Silver Organic finish. 500 hours salt spray and a Corrosion Rating of 3.
• Approved to BS EN 10666 (DIN 7504).

• Stitching metal roofing sheets together at the side lap.
• Joining cladding sheets sheet-to-sheet where the panels overlap.
• Closing side laps on profiled steel to keep the run weathertight.
• Any thin sheet-to-sheet metal fixing up to 1.6mm combined thickness.

• Brand: TIMCO
• Material: Case & core hardened carbon steel
• Finish: Zinc & Clear (silver, exterior)
• Head type: Hex (8mm socket)
• Point: Self-drilling (through steel up to 1.6mm)
• Sealing washer: 16mm EPDM (included)
• Substrate: Sheet steel to sheet steel (lap stitching)
• Use: Stitching metal roofing and cladding laps
• Corrosion rating: 3 (exterior)
• Pack: Box

What is a stitching screw?

It's a short self-drilling screw that joins two thin metal sheets together at the point where they overlap. On a roof or cladding run that overlap is the side lap. The screw stitches the two skins tight so the joint doesn't gap or rattle.

What's the difference between sheet-to-sheet and sheet-to-purlin fixings?

Sheet-to-sheet stitching screws hold two metal sheets to each other at the lap. They're short. Sheet-to-purlin (or sheet-to-timber) fixings are longer and hold the sheet down onto the frame below. These stitching screws are the sheet-to-sheet type. Use a longer fixing for the purlin.

What's the maximum thickness these will drill?

1.6mm combined. That's both sheets added together at the lap. Go over that and the No.2 point may struggle to drill through cleanly.

What does the EPDM washer do?

The 16mm EPDM washer is a rubber-bonded washer under the head. As you drive the screw home it compresses and forms a seal around the fixing. That keeps water out of the hole, which matters on an exterior roof or wall.

Do I need to pre-drill?

No. The self-drilling point cuts its own hole through thin steel, so you can drive straight in. Keep the speed between 1,000 and 1,800 RPM and let the point do the work.

What socket do I need to drive them?

An 8mm socket fits the hex head. A nut runner or an impact driver with a socket bit works well.