DIN 7991 M3
Countersunk head screw,hex drive
- Thread M3 × 0.5
- Hex key 2 mm
- Tap drill Ø 2.5 mm
Dimensions and tolerances (mm)
| min | nom. | max | |
|---|---|---|---|
| d | |||
| dk | |||
| k | |||
| s | |||
| t |
Values per DIN 7991:1986.
In bold: the value shown in the table on the standard page.
Mechanical properties
No strength table for this screw: its head is lower or countersunk, so it carries less than a full head, and the usual rule for that (80 % of the load of a full head) has one source only.
Standard threads (mm)
| P | d₂ | d₃ | |
|---|---|---|---|
| M3Coarse (most common) | 0.50 | 2.675 | 2.387 |
Profile per ISO 68-1 · tolerance class 6g
Standard lengths (mm)
Length l measured from the top of the head.
Screws up to about 12 mm are fully threaded.Longer ones are threaded for b = 12 mm.
Partly verified data
We have checked part of this data against reliable sources. The values marked with a have fewer sources than we require: use them as a guide and check them (they may not appear in this view).MechLab Geek accepts no liability for any use of this data or its consequences. Check it before you use it. Legal notice.Spotted a mistake? Let us know.
References
- DIN 7991:1986 Hexagon socket countersunk head cap screws
- ISO 68-1:1998 ISO general purpose screw threads — Basic profile — Part 1: Metric screw threads