FASTENERS Metric Bolts & Screws 5
REFERENCE CHART — DETERMINING THREAD LENGTHS METRIC
There is a formula for calculating minimum length on threads on any given metric cap screw. It is as follows: Minimum thread length equals twice the basic thread diameter plus 6mm for screw lengths up to 125 mm long, twice the basic thread diameter plus 12 mm for screw lengths between 125 mm and 200 mm long, and twice the basic thread diameter plus 25 mm for screw lengths over 200 mm long.
1
LENGTH STANDARDS FOR FULL OR PARTIAL THREADS
Capscrew Diameter
M4
M5
M6
M7
M8
M10
Fully Threaded Max. Length*
25
30
30
30
35
40
Capscrew Diameter
M12
M14
M16
M18
M20
M24
Fully Threaded Max. Length*
45
50
55
60
65
75
*These lengths and longer = partially threaded
REFERENCE CHART — METRIC
METRIC THREAD PITCH
LENGTH
Metric mm
Inch Approx.
Metric mm
Inch Approx.
Thread Pitch
BOLT SIZE
Coarse Thread
Fine Thread
Fine Thread
1
70 75 80 85 90
3/64” 1/16” 5/64” 3/32”
2-3/4”
1.5
3”
0.25 0.25 0.25
M1
2
3-3/16” 3-3/8”
M1.1 M1.2 M1.4 M1.6 M1.8 M2.2 M2.5 M2
2.5
0.3
3 4 5 6
1/8”
3-1/2”
0.35 0.35
100 110 120 130 140 150 160 170 180 190 200 220 240 260 270 280 300 320 340 360 380 400 420 440 460 480 500
5/32” 3/16”
4”
0.4
4-3/8” 4-3/4”
0.45 0.45
1/4” 1/4”
6.5
5”
0.5 0.6 0.7
M3
8
5/16”
5-1/2”
M3.5
0.35
0.5
M4
9.5
3/8” 3/8” 1/2” 1/2”
6”
0.75
M4.5
10 12 13 14 16 18 19 20 22 25 30 32 35 36 38 40 45 50 55 60 65
6-1/4” 6-3/4”
0.8
0.5 .75
M5 M6 M7 M8 M9
1 1
.5
7”
1.25 1.25
1 1
.75
9/16”
7-1/2”
5/8”
8”
1.5 1.5
1.25
1
M10 M11 M12 M14 M16 M18 M20 M22 M24 M27 M30 M33 M36 M39 M42 M45 M48 M52 M56 M60 M64 M68
1
11/16”
8-3/4” 9-9/16 10-1/4” 10-3/4”
1.75
1.5 1.5 1.5
1.25 1.25
3/4” 3/4” 7/8”
2 2
1 1 1
2.5 2.5 2.5
2
1.5
1”
11” 12”
2 2 2 2 2 3
1.5 1.5 1.5 1.5
1-3/16” 1-1/4” 1-3/8” 1-7/16” 1-1/2” 1-9/16”
3 3
12-1/2” 13-1/2” 14-1/4”
3.5 3.5
4 4
15”
4.5 4.5
15-3/4” 16-1/2” 17-3/8”
1-3/4”
5 5
2”
5.5 5.5
2-3/16” 2-3/8” 2-9/16”
18” 19” 20”
6 6
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