DIN 933 Hex Head Setscrews
We supply DIN 933 fully threaded hex setscrews in high tensile grades 8.8, 10.9 and 12.9 and stainless steel A2 and A4, from M4 to M48. Thread runs the full length to the head, so the setscrew clamps effectively in tapped holes and thin assemblies where a part-threaded bolt would run out of usable thread.
Also known as: hex setscrew, set screw, fully threaded bolt, hexagon setscrew, tap bolt.
DIN 933 dimensions
| Diameter | Pitch | Head depth (k) | Across flats (s) |
|---|---|---|---|
| M4 | 0.7mm | 2.8mm | 7mm |
| M5 | 0.8mm | 3.5mm | 8mm |
| M6 | 1.0mm | 4mm | 10mm |
| M7 | 1.0mm | 4.8mm | 11mm |
| M8 | 1.25mm | 5.3mm | 13mm |
| M10 | 1.5mm | 6.4mm | 17mm |
| M12 | 1.75mm | 7.5mm | 19mm |
| M14 | 2mm | 8.8mm | 22mm |
| M16 | 2mm | 10mm | 24mm |
| M18 | 2.5mm | 11.5mm | 27mm |
| M20 | 2.5mm | 12.5mm | 30mm |
| M22 | 2.5mm | 14mm | 32mm |
| M24 | 3.0mm | 15mm | 36mm |
| M27 | 3.0mm | 15mm | 41mm |
| M30 | 3.5mm | 18.7mm | 46mm |
| M33 | 3.5mm | 21mm | 50mm |
| M36 | 4mm | 22.5mm | 55mm |
| M39 | 4mm | 25mm | 60mm |
| M42 | 4.5mm | 26mm | 65mm |
| M45 | 4.5mm | 28mm | 70mm |
| M48 | 5mm | 30mm | 75mm |
Materials & strength
Steel grades 8.8, 10.9 & 12.9
Property class 8.8 (minimum tensile strength 800 N/mm2) for general and structural work; 10.9 and 12.9 for higher clamp loads.
Stainless A2 & A4
Supplied in grades 50, 70 and 80. A2 for general use, A4 for marine and chemical exposure.
Related specificationsWhat is the difference between a setscrew and a bolt?
In UK trade usage a setscrew is threaded along its full length and a bolt has a plain shank below the head. DIN 933 is the fully threaded pattern; its part-threaded partner is DIN 931. The terms are often mixed in practice, so if a drawing is ambiguous, check whether full thread matters for the joint.
What do the steel grades 8.8, 10.9 and 12.9 mean?
The numbers describe the fastener's property class. The first number multiplied by 100 gives its nominal tensile strength in N/mm2; the second indicates the ratio of yield strength to tensile strength. So an 8.8 fastener has a nominal tensile strength of 800 N/mm2, with 10.9 and 12.9 representing progressively higher-strength classes.
How does DIN 933 compare with ISO 4017?
DIN 933 and ISO 4017 both cover fully threaded hexagon head screws, and the same caution applies as with DIN 931 and ISO 4014: the standards are closely related, but dimensional differences exist at some sizes, including across-flats. Where a drawing specifies a particular designation, quote to that designation rather than substituting automatically.
Is DIN 933 available in stainless steel?
Yes - DIN 933 setscrews are available in A2 and A4 stainless steel across a wide range of metric sizes, alongside the high tensile steel grades. Send us the drawing callout and we'll quote from the correct standard.
Need DIN 933 in a non-standard size or material?
Send us your drawing — specials quoted within 24 hours.