FASTENER STANDARD
ISO 4028
Hexagon socket set screws with dog point
This document specifies the characteristics of hexagon socket set screws with dog point, with metric coarse pitch threads M1,6 to M30 for steel and M1,6 to M24 for stainless steel, and with product grade A. Set screws are not intended for use under tensile load. If, in certain cases other specifications are requested, hardness classes and stainless steel grades can be selected from ISO 898-5 or ISO 3506-3, and dimensional options from ISO 888, ISO 965-1 or ISO 4753.
2003 · currentISO 4028 dimensional reference
Hexagon socket set screws with dog point
| Thread size | Pitch (mm) | Socket (mm) | keyEngagementShortMin | keyEngagementLongMin | pointDiameterMax | pointDiameterMin | pointLengthShortMin | pointLengthShortMax | pointLengthLongMin | pointLengthLongMax | shortLengthLimit |
|---|---|---|---|---|---|---|---|---|---|---|---|
| M3 | 0.5 | 1.5 | 1.2 | 2 | 2 | 1.75 | 0.75 | 1 | 1.5 | 1.75 | 5 |
| M4 | 0.7 | 2 | 1.5 | 2.5 | 2.5 | 2.25 | 1 | 1.25 | 2 | 2.25 | 6 |
| M5 | 0.8 | 2.5 | 2 | 3 | 3.5 | 3.2 | 1.25 | 1.5 | 2.5 | 2.75 | 6 |
| M6 | 1 | 3 | 2 | 3.5 | 4 | 3.7 | 1.5 | 1.75 | 3 | 3.25 | 8 |
| M8 | 1.25 | 4 | 3 | 5 | 5.5 | 5.2 | 2 | 2.25 | 4 | 4.3 | 10 |
| M10 | 1.5 | 5 | 4 | 6 | 7 | 6.64 | 2.5 | 2.75 | 5 | 5.3 | 12 |
| M12 | 1.75 | 6 | 4.8 | 8 | 8.5 | 8.14 | 3 | 3.25 | 6 | 6.3 | 16 |
| M16 | 2 | 8 | 6.4 | 10 | 12 | 11.57 | 4 | 4.3 | 8 | 8.36 | 20 |
| M20 | 2.5 | 10 | 8 | 12 | 15 | 14.57 | 5 | 5.3 | 10 | 10.36 | 25 |