Socket Screw Dimensions
Printable shop wall chart: Socket Screw Dimensions. Free letter-size PDF to print and post at the counter; 25 x 36 inch poster version available.
| Size | Head diameter | Head height | Hex key |
|---|---|---|---|
| #6 | 0.226 | 0.138 | 7/64 |
| #8 | 0.270 | 0.164 | 9/64 |
| #10 | 0.312 | 0.190 | 5/32 |
| 1/4 | 0.375 | 0.250 | 3/16 |
| 5/16 | 0.469 | 0.312 | 1/4 |
| 3/8 | 0.562 | 0.375 | 5/16 |
| 1/2 | 0.750 | 0.500 | 3/8 |
| 5/8 | 0.938 | 0.625 | 1/2 |
| 3/4 | 1.125 | 0.750 | 5/8 |
| 1 | 1.500 | 1.000 | 3/4 |
Metric (ISO 4762 / DIN 912), mm
| Size | Head diameter | Head height | Hex key |
|---|---|---|---|
| M3 | 5.5 | 3 | 2.5 |
| M4 | 7 | 4 | 3 |
| M5 | 8.5 | 5 | 4 |
| M6 | 10 | 6 | 5 |
| M8 | 13 | 8 | 6 |
| M10 | 16 | 10 | 8 |
| M12 | 18 | 12 | 10 |
| M16 | 24 | 16 | 14 |
| M20 | 30 | 20 | 17 |
Maximum/basic head dimensions. Head height equals nominal diameter on standard socket head cap screws. ASME B18.3 and ISO 4762 are the product (dimension) standards; ASTM A574 and ISO 898-1 class 12.9 are the material/strength standards.
These tables carry the same figures as the printed sheet below.
The printed sheet
25 x 36 inch poster version
For the full-size shop poster, tell us where to send it.
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Text version of this sheet
SOCKET HEAD CAP
BUTTON HEAD
FLAT HEAD
Socket head cap screws · head diameter, head height and hex key
Inch (ASME B18.3 / ASTM A574), in
Size
Head diameter
Head height
Hex key
#6
0.226
0.138
7/64
#8
0.270
0.164
9/64
#10
0.312
0.190
5/32
1/4
0.375
0.250
3/16
5/16
0.469
0.312
1/4
3/8
0.562
0.375
5/16
1/2
0.750
0.500
3/8
5/8
0.938
0.625
1/2
3/4
1.125
0.750
5/8
1
1.500
1.000
3/4
Metric (ISO 4762 / DIN 912), mm
Size
Head diameter
Head height
Hex key
M3
5.5
3
2.5
M4
7
4
3
M5
8.5
5
4
M6
10
6
5
M8
13
8
6
M10
16
10
8
M12
18
12
10
M16
24
16
14
M20
30
20
17
Maximum/basic head dimensions. Head height equals nominal diameter on standard socket head cap screws. ASME B18.3 and ISO 4762 are the product (dimension) standards; ASTM A574
and ISO 898-1 class 12.9 are the material/strength standards.
The Fastener App | TheFastenerApp.com
Fastener Guide reference FG-C82790 · thefastenerapp.com/fastener-guide/wall-charts/socket-screw-dimensions · © The Fastener App. Reference only — verify the current governing standard, drawing and manufacturer data before specifying or installing.
