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Standard Type – Cold Formed
| BLANK | M | BSW BSF |
UNC UNF |
e | h | D | g | m | |
| AA | M3 M4 |
1/8 5/32 |
(5-40) 6-32 |
Min Max |
17.70 19.20 |
8.20 9.40 |
7.40 8.20 |
1.80 2.20 |
2.80 3.20 |
| XA | M3 M4 M5 |
5/32 3/16 |
6-32 8-32 |
Min Max |
20.00 22.00 |
9.00 10.20 |
8.30 9.30 |
2.30 2.70 |
3.80 4.20 |
| A | M5 | 3/16 (7/32) |
8-32 10-24 10-32 |
Min Max |
21.00 23.00 |
9.90 11.10 |
9.00 10.00 |
2.40 2.80 |
3.80 4.20 |
| AB | (M5E) M6E |
1/4E | 1/4E | Min Max |
24.00 26.00 |
11.60 12.80 |
10.00 11.00 |
2.80 3.20 |
4.00 4.60 |
| B | M6 (M7) |
1/4 | 1/4 | Min Max |
25.80 27.80 |
12.30 13.50 |
11.40 12.40 |
2.80 3.20 |
4.60 5.20 |
| C | M8 | 5/16 | 5/16 | Min Max |
29.30 31.30 |
14.20 15.40 |
13.00 14.00 |
3.10 3.50 |
5.10 5.70 |
| XC | M4/M5 M6/M8 |
1/4 5/16 |
1/4 5/16 |
Min Max |
34.80 36.80 |
15.90 17.10 |
12.20 13.20 |
3.10 3.50 |
5.10 5.70 |
| D | M10 | 3/8 | 3/8 | Min Max |
34.10 36.50 |
16.60 18.00 |
14.60 16.00 |
3.70 4.30 |
5.90 6.70 |
| E | M12 | 7/16 1/2 |
7/16 1/2 |
Min Max |
46.20 48.80 |
21.30 23.30 |
19.60 21.40 |
4.60 5.40 |
7.40 8.40 |
| EE | M14 M16 |
(9/16) 5/8 |
(9/16) 5/8 |
Min Max |
63.30 66.70 |
29.30 32.30 |
24.00 26.00 |
6.00 7.00 |
10.00 11.20 |
| F | M18 M20 |
3/4 | 3/4 | Min Max |
64.80 68.20 |
29.70 32.70 |
28.30 30.30 |
6.70 7.70 |
11.60 12.80 |
Heavy Type – Cold Formed
| BLANK | M | BSW BSF |
UNC UNF |
e | h | D | g | m | |
| A | M3 P M4 P |
1/8 P 5/32 P |
(5-40 P) 6-32 P |
Min Max |
21.00 23.00 |
9.90 11.10 |
9.00 10.00 |
2.40 2.80 |
3.80 4.20 |
| B | M5 P | 3/16 P | 10-24 P 10-32 P |
Min Max |
25.80 27.80 |
12.30 13.50 |
11.40 12.40 |
2.80 3.20 |
4.60 5.20 |
| C | M6 P | 1/4 P | 1/4 P | Min Max |
29.30 31.30 |
14.20 15.40 |
13.00 14.00 |
3.10 3.50 |
5.10 5.70 |
| D | M8 P | 5/16 P | 5/16 P | Min Max |
34.10 36.50 |
16.60 18.00 |
14.60 16.00 |
3.70 4.30 |
5.90 6.70 |
| E | M10 P | 3/8 P | 3/8 P | Min Max |
46.20 48.80 |
21.30 23.30 |
19.60 21.40 |
4.60 5.40 |
7.40 8.40 |
| EE | M12 P | 1/2 P | 1/2 P | Min Max |
63.30 66.70 |
29.30 32.30 |
24.00 26.00 |
6.00 7.00 |
10.00 11.20 |
| F | M14 P M16 P |
9/16 P 5/8 P |
9/16 P 5/8 P |
Min Max |
64.80 68.20 |
29.70 32.70 |
28.30 30.30 |
6.70 7.70 |
11.60 12.80 |
Light Type – Cold Formed
| BLANK | M | BSW BSF |
UNC UNF |
e | h | D | g | m | |
| A | M6 L | 1/4 L | 1/4 L | Min Max |
21.00 23.00 |
9.90 11.10 |
9.00 10.00 |
2.40 2.80 |
3.80 4.20 |
| B | M8 L | 5/16 L | 5/16 L | Min Max |
25.80 27.80 |
12.30 13.50 |
11.40 12.40 |
2.80 3.20 |
4.60 5.20 |
| DE | M12 L | 7/16 L 1/2 L |
7/16 L 1/2 L |
Min Max |
40.70 43.30 |
19.50 21.50 |
18.20 19.80 |
3.80 4.60 |
6.00 7.00 |
Materials
Steel (Fe) – Brass (OT 63) – Stainless Steel AISI 304 (A2) – Stainless Steel AISI 316 (A4) – Aluminium
Tolerances
Metric Thread class 6G
Whitworth Thread medium class
American Standard Thread class 2B
Dimensions
Unquoted parts in this document are not binding. Gamma Officine Meccaniche S.p.A. reserves the possibility to change, modify or eliminate products or dimensions without prior notice.
Notes
Different threading can be performed on the same blank. For example: Blank “B” threaded “M4″ or Blank “E” threaded “5/16″.
