DIN 7984 M8
Socket head cap screw with low head,hex drive
- Thread M8 × 1.25
- Hex key 5 mm
- Tap drill Ø 6.8 mm
Dimensions and tolerances (mm)
| min | nom. | max | |
|---|---|---|---|
| d | |||
| dk | |||
| k | |||
| s | |||
| t |
Values per DIN 7984:2022-03.
In bold: the value shown in the table on the standard page.
Not fully verified
Design and assembly (mm)
- Tap drillDIN 336, coarse thread
- Ø 6.8
- Clearance holeISO 273, dh by fit
- close Ø 8.4normal Ø 9.0loose Ø 10.0
| Under the head | Ø d1 | t1 |
|---|---|---|
| Ø 15.0 (not fully verified) | 5.6 (not fully verified) |
Not fully verified
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 | |
|---|---|---|---|
| M8Coarse (most common) | 1.25 | 7.188 | 6.466 |
| M8 × 1Fine | 1.00 | 7.350 | 6.773 |
Profile per ISO 68-1 · tolerance class 6g
Standard lengths (mm)
Length l measured from under the head.
Screws up to about 22 mm are fully threaded.Longer ones are threaded for b = 22 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 7984:2022-03 Hexagon socket head cap screws with low head with reduced loadability
- ISO 68-1:1998 ISO general purpose screw threads — Basic profile — Part 1: Metric screw threads
- DIN 336:2003 Diameters of drills for minor diameters of tapped threads
- ISO 273:1979 Fasteners — Clearance holes for bolts and screws
- DIN 974-1:2008 Diameters of counterbores - Manufacturing dimensions - Part 1: Hexagon socket head cap screws and screws with cheese head or pan head