DIN 7504 Washer Hex Self-Drilling Screws (Form K)
We supply DIN 7504 K washer hex self-drilling screws - hexagon head with an integral washer flange - from 3.5mm to 6.3mm diameter. The hardened drill point cuts its own hole in sheet steel and taps the thread in one operation; the hex head takes a socket driver for fast powered assembly.
Also known as: hex washer head self drilling screw, din 7504 k, tek screw hex, hex head self driller, washer flange tek screw.
DIN 7504 dimensions
| Diameter/Gauge | Head diameter (d1 max) | Head height (k max) | A/F (s max) |
|---|---|---|---|
| 3.5mm/6g | 8.30mm | 3.45mm | 5.50mm |
| 3.9mm/7g | 8.30mm | 3.45mm | 5.50mm |
| 4.2mm/8g | 8.80mm | 4.25mm | 7.00mm |
| 4.8mm/10g | 10.50mm | 4.45mm | 8.00mm |
| 5.5mm/12g | 11.00mm | 5.45mm | 8.00mm |
| 6.3mm/14g | 13.20mm | 6.45mm | 10.00mm |
Form K — A2 Stainless Steel
| Diameter/Gauge | Head diameter (d1 max) | Head height (k max) | A/F (s max) |
|---|---|---|---|
| 3.5mm/6g | 8.30mm | 3.40mm | 5.50mm |
| 3.9mm/7g | 8.30mm | 3.40mm | 5.50mm |
| 4.2mm/8g | 8.80mm | 4.10mm | 7.00mm |
| 4.8mm/10g | 10.50mm | 4.30mm | 8.00mm |
| 5.5mm/12g | 11.00mm | 5.40mm | 8.00mm |
| 6.3mm/14g | 13.50mm | 5.90mm | 10.00mm |
Materials & strength
Drill point
The fluted drill point cuts its own pilot hole in sheet steel, then the thread taps in behind it - a one-operation fixing.
Washer hex head
The integral flange under the hex spreads the clamping load and the external hex takes a socket driver - the standard pattern for sheet-to-steel and cladding work.
Stainless steel A2
A2 stainless listed from 3.5mm to 6.3mm for corrosion resistance.
Steel zinc plated
Zinc plated finish on hardened carbon steel.
Related specificationsWhat is a washer hex (form K) self-drilling screw?
The DIN 7504 variant with a hexagon head and integral washer flange. It is driven with a socket rather than a recess bit, which suits high-volume powered fixing of sheet to steel framing.
Why choose the hex head over pan or countersunk forms?
The socket drive resists cam-out under the higher torque of drilling into steel, and the flange spreads load on the sheet. Pan and countersunk forms suit fixings where a low or flush head is needed.
What sizes are available?
A2 stainless is listed from 3.5mm to 6.3mm diameter. A2 stainless self-drilling washer head screws are available to similar dimensions; where standard conformance is required, confirm with us. Send us your requirement and we will quote sizes and finishes to suit.
Need DIN 7504 in a non-standard size or material?
Send us your drawing — specials quoted within 24 hours.