This product guide contains the specification for metric threaded socket head button screws as available from Westfield Fasteners. The basis of this specification is the DIN standard DIN 7981.
Thread Size | 2.2 (no.2) | 2.9 (no.4) | 3.5 (no.6) | 3.9 (no.7) | 4.2 (no.8) | 4.8 (no.10) | 5.5 (no.12) | 6.3 (no.14) | ||
---|---|---|---|---|---|---|---|---|---|---|
p | 0.8 | 1.1 | 1.3 | 1.3 | 1.4 | 1.6 | 1.8 | 1.8 | ||
a | max | 0.8 | 1.1 | 1.3 | 1.3 | 1.4 | 1.6 | 1.8 | 1.8 | |
dk | max=nom | 4.2 | 5.6 | 6.9 | 7.5 | 8.2 | 9.5 | 10.8 | 12.5 | |
min | 3.9 | 5.3 | 6.54 | 7.14 | 7.84 | 9.14 | 10.37 | 12.07 | ||
k | max=nom | 1.8 | 2.2 | 2.6 | 2.8 | 3.05 | 3.55 | 3.95 | 4.55 | |
min | 1.55 | 1.95 | 2.35 | 2.55 | 2.75 | 3.25 | 3.65 | 4.25 | ||
r | max | 0.3 | 0.4 | 0.5 | 0.5 | 0.6 | 0.7 | 0.8 | 0.9 | |
rf | = | 3.4 | 4.4 | 5.4 | 5.8 | 6.2 | 7.2 | 8.2 | 9.5 | |
Cross Recess | Cross Recess No. | 1 | 2 | 3 | ||||||
Type Z | m = | 2.4 | 2.9 | 3.9 | 4.1 | 4.3 | 4.7 | 6.2 | 6.7 | |
Penetration Depth min | 1.1 | 1.58 | 1.47 | 1.7 | 1.88 | 2.28 | 2.51 | 3.02 | ||
Penetration Depth max | 1.35 | 1.83 | 1.93 | 2.16 | 2.34 | 2.74 | 2.97 | 3.48 | ||
y max | Type C | 2 | 2.6 | 3.2 | 3.5 | 3.7 | 4.3 | 5 | 6 | |
Type F | 1.6 | 2.1 | 2.5 | 2.7 | 2.8 | 3.2 | 3.6 | 3.6 |
Nominal Length | Type C | |
---|---|---|
min | max | |
4.5 | 3.7 | 5.3 |
6.5 | 5.7 | 7.3 |
9.5 | 8.7 | 10.3 |
13 | 12.2 | 13.8 |
16 | 15.2 | 16.8 |
19 | 18.2 | 19.8 |
22 | 21.2 | 22.8 |
25 | 24.2 | 25.8 |
32 | 30.7 | 33.3 |
38 | 36.7 | 39.3 |