Bolt Size Standard Recommended CS Dia. Head Range
#0 (0.060") 82° Imp
130.0 thou
3.30 mm
110-130 thou
2.80-3.30 mm
#1 (0.073") 82° Imp
160.0 thou
4.06 mm
140-160 thou
3.55-4.06 mm
#2 (0.086") 82° Imp
190.0 thou
4.83 mm
162-190 thou
4.11-4.83 mm
#4 (0.112") 82° Imp
225.0 thou
5.71 mm
207-225 thou
5.25-5.72 mm
#6 (0.138") 82° Imp
279.0 thou
7.09 mm
255-279 thou
6.48-7.10 mm
#8 (0.164") 82° Imp
332.0 thou
8.43 mm
304-332 thou
7.72-8.45 mm
#10 (0.190") 82° Imp
385.0 thou
9.78 mm
352-385 thou
8.94-9.80 mm
1/4" (0.250") 82° Imp
507.0 thou
12.88 mm
463-507 thou
11.76-12.90 mm
5/16" (0.312") 82° Imp
635.0 thou
16.13 mm
581-635 thou
14.75-16.15 mm
3/8" (0.375") 82° Imp
762.0 thou
19.35 mm
697-762 thou
17.70-19.40 mm
1/2" (0.500") 82° Imp
1017.0 thou
25.83 mm
931-1017 thou
23.65-25.85 mm
5/8" (0.625") 82° Imp
1250.0 thou
31.75 mm
1145-1250 thou
29.10-31.75 mm
3/4" (0.750") 82° Imp
1500.0 thou
38.10 mm
1385-1500 thou
35.20-38.10 mm
M2 90° Metric
173.2 thou
4.40 mm
149-173 thou
3.80-4.40 mm
M2.5 90° Metric
216.5 thou
5.50 mm
185-216 thou
4.70-5.50 mm
M3 90° Metric
248.0 thou
6.30 mm
216-248 thou
5.50-6.30 mm
M4 90° Metric
330.7 thou
8.40 mm
295-331 thou
7.50-8.40 mm
M5 90° Metric
393.7 thou
10.00 mm
362-394 thou
9.20-10.00 mm
M6 90° Metric
496.1 thou
12.60 mm
433-496 thou
11.00-12.60 mm
M8 90° Metric
681.1 thou
17.30 mm
590-681 thou
15.00-17.30 mm
M10 90° Metric
826.8 thou
21.00 mm
720-827 thou
18.30-21.00 mm
M12 90° Metric
1023.6 thou
26.00 mm
866-1024 thou
22.00-26.00 mm
M16 90° Metric
1259.8 thou
32.00 mm
1142-1260 thou
29.00-32.00 mm
M20 90° Metric
1574.8 thou
40.00 mm
1417-1575 thou
36.00-40.00 mm