DIN 963 Slotted Countersunk Machine Screws
We supply DIN 963 slotted countersunk machine screws in A2 and A4 stainless steel from M1 to M16, plus steel 4.8 zinc plated and a range of brass and nylon. Slotted countersunk machine screws sit flush with the surface and take a plain screwdriver, a traditional pattern still specified across electrical, instrument and restoration work.
Also known as: slotted csk, slotted countersunk screw, csk slotted machine screw, flat head slotted screw, countersunk slot screw.
DIN 963 dimensions
| Diameter | Pitch | Head diameter | Head depth | Slot width |
|---|---|---|---|---|
| M1 | 0.25mm | 1.9mm | 0.6mm | 0.25mm |
| M1.6 | 0.35mm | 3.0mm | 0.96mm | 0.4mm |
| M2 | 0.4mm | 3.8mm | 1.2mm | 0.5mm |
| M2.5 | 0.45mm | 4.7mm | 1.5mm | 0.6mm |
| M3 | 0.5mm | 5.6mm | 1.65mm | 0.8mm |
| M4 | 0.7mm | 7.5mm | 2.2mm | 1.0mm |
| M5 | 0.8mm | 9.2mm | 2.5mm | 1.2mm |
| M6 | 1.0mm | 11.0mm | 3.0mm | 1.6mm |
| M8 | 1.25mm | 14.5mm | 4.0mm | 2.0mm |
| M10 | 1.5mm | 18.0mm | 5.0mm | 2.5mm |
| M12 | 1.75mm | 22.0mm | 6.0mm | 3.0mm |
| M14 | 2.0mm | 25.0mm | 7.0mm | 3.0mm |
| M16 | 2.0mm | 29.0mm | 8.0mm | 4.0mm |
| M18 | 2.5mm | 33.0mm | 9.0mm | 4.0mm |
| M20 | 2.5mm | 36.0mm | 10.0mm | 5.0mm |
Materials & strength
Steel 4.8
Property class 4.8 - minimum tensile strength 400 N/mm2. Zinc plated as standard. The general-purpose choice for light assembly and enclosure work.
Stainless A2 (304)
Supplied to class A2-50. Good general corrosion resistance for indoor and sheltered external use.
Stainless A4 (316)
Supplied to class A4-50. Molybdenum-bearing grade for marine, chloride and chemical environments - specify A4 anywhere salt is involved.
Related specificationsIs DIN 963 still a current standard?
DIN 963 has been superseded by ISO 2009. The standards are closely related, although dimensional or technical differences may exist. If your drawing specifies DIN 963, send us the requirement and we can identify the appropriate product.
Is DIN 963 available in brass?
Yes - DIN 963 slotted countersunk screws are available in brass and nylon, alongside A2 and A4 stainless steel and steel 4.8 zinc plated.
What sizes do DIN 963 slotted countersunk screws come in?
The dimension table covers M1 to M20, with A2 and A4 stainless steel available from M1 to M16. Larger and non-standard sizes can be quoted on request.
Need DIN 963 in a non-standard size or material?
Send us your drawing — specials quoted within 24 hours.