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Material Strengths (Part 1)

Material strength for industrial machine screws from Leland Powell Fasteners is listed below by grade, type and class and separated into 60,000 psi, 75,000 psi and 120,000 psi.

Material Strength - 60,000 psi
J82 60M or Grade 1 or Class 4.8
Size
Dia.
Stress
Area
Tensile
Str.
Lbs
Proof Load Str.
Lbs
Dry Parts K=.2
Lubricated Parts K=.15
Min Break Str. (in/lbs)
Max Torque Value (in/lbs)
Min Break Str, (in/lbs)
Max
Torque
Value (in/lbs)
8-32
0.1640
0.01400
840
462
20.7
11.4
15.5
8.5
10-24
0.1900
0.01750
1,050
578
29.9
16.5
22.4
12.3
10-32
0.1900
0.02000
1,200
660
34.2
18.8
25.7
14.1
1/4-20
0.2500
0.03180
1,908
1,049
71.6
39.4
53.7
29.5
1/4-28
0.2500
0.03637
2,182
1,200
81.8
45.0
61.4
33.8
5/16-18
0.3125
0.05240
3,144
1,729
147.4
81.1
110.5
60.8
5/16-24
0.3125
0.05800
3,480
1,914
163.1
89.7
122.3
67.3
3/8-16
0.3750
0.07750
4,650
2,558
261.6
143.9
196.2
107.9
3/8-24
0.3750
0.08780
5,268
2,897
296.3
163.0
222.2
122.2
7/16-14
0.4375
0.10630
6,378
3,508
418.6
230.2
313.9
172.7
7/16-20
0.4375
0.11870
7,122
3,917
467.4
257.1
350.5
192.8
M3.5x0.6
0.1380
0.01051
631
347
13.1
7.2
9.8
5.4
M4x0.7
0.1575
0.01349
809
445
19.1
10.5
14.3
7.9
M5x0.8
0.1970
0.02201
1,321
726
39.0
21.5
29.3
16.1
M6x1.0
0.2360
0.03116
1,869
1,028
66.2
36.4
49.6
27.3
M7x1.0
0.2755
0.04473
2,684
1,476
110.9
61.0
83.2
45.8
M8x1.25
0.3150
0.05673
3,404
1,872
160.8
88.5
120.6
66.3
M10x1.5
0.3940
0.08990
5,394
,2967
318.8
175.3
239.1
131.5
M12x1.75
0.4720
0.13067
7,840
4,312
555.1
305.3
416.3
229.0
Material Strength - 75,000 psi
Grade 2 or Class 5.8
Size
Dia.
Stress
Area
Tensile
Str.
Lbs
Proof Load Str.
Lbs
Dry Parts K=.2
Lubricated Parts K=.15
Min Break Str. (in/lbs)
Max Torque Value (in/lbs)
Min Break Str, (in/lbs)
Max
Torque
Value (in/lbs)
8.32
0.1640
0.01400
1,050
788
25.8
19.4
19.4
14.5
10-24
0.1900
0.01750
1,313
984
37.4
28.1
28.1
21.0
10-32
0.1900
0.02000
1,500
1,125
42.8
32.1
32.1
24.0
1/4-20
0.2500
0.03180
2,385
1,789
89.4
67.1
67.1
50.3
1/4-28
0.2500
0.03637
2,728
2,046
102.3
76.7
76.7
57.5
5/16-18
0.3125
0.05240
3,930
2,948
184.2
138.2
138.2
103.6
5/16-24
0.3125
0.05800
4,350
3,263
203.9
152.9
152.9
114.7
3/8-16
0.3750
0.07750
5,813
4,359
327.0
245.2
245.2
183.9
3/8-24
0.3750
0.08780
6,585
4,939
370.4
277.8
277.8
208.4
7/16-14
0.4375
0.10630
7,973
5,979
523.2
392.4
392.4
294.3
7/16-20
0.4375
0.11870
8,903
6,677
584.2
438.2
438.2
328.6
M3.5x0.6
0.1380
0.01051
788
591
16.3
12.2
12.2
9.2
M4x0.7
0.1575
0.01349
1,012
759
23.9
17.9
17.9
13.4
M5x0.8
0.1970
0.02201
1,651
1,238
48.8
36.6
36.6
27.4
M6x1.0
0.2360
0.03116
2,337
1,752
82.7
62.0
62.0
46.5
M7x1.0
0.2755
0.04473
3,355
2,516
138.6
104.0
104.0
78.0
M8x1.25
0.3150
0.05673
4,255
3,191
201.0
150.8
150.8
113.1
M10x1.5
0.3940
0.08990
6,743
5,057
398.5
298.9
298.9
224.1
M12x1.75
0.4720
0.13067
9,800
7,350
693.9
520.4
520.4
390.3
Material Strength - 120,000 psi
J82 120M or Grade 5 or Grade 5.1 or J81
or J1237 Type 2 or Class 8.8
Size
Dia.
Stress
Area
Tensile
Str.
Lbs
Proof Load Str.
Lbs
Dry Parts K=.2
Lubricated Parts K=.15
Min Break Str. (in/lbs)
Max Torque Value (in/lbs)
Min Break Str, (in/lbs)
Max
Torque
Value (in/lbs)
8-32
0.1640
0.01400
1,680
1,176
41.3
28.9
31.0
21.7
10-24
0.1900
0.01750
2,100
1,470
59.9
41.9
44.9
31.4
10-32
0.1900
0.02000
2,400
1,680
68.4
47.9
51.3
35.9
1/4-20
0.2500
0.03180
3,816
2,671
143.1
100.2
107.3
75.1
1/4-28
0.2500
0.03637
4,364
3,055
163.7
114.6
122.7
85.9
5/16-18
0.3125
0.05240
6,288
4,402
294.8
206.3
221.1
154.7
5/16-24
0.3125
0.05800
6,960
4,872
326.3
228.4
244.7
171.3
3/8-16
0.3750
0.07750
,9300
6,510
523.1
366.2
392.3
274.6
3/8-24
0.3750
0.08780
10,536
7,375
592.7
414.9
444.5
311.1
7/16-14
0.4375
0.10630
12,756
8,929
837.1
586.0
627.8
439.5
7/16-20
0.4375
0.11870
14,244
9,971
934.8
654.3
701.1
490.8
M3.5x0.6
0.1380
0.01051
1,261
883
26.1
18.3
19.6
13.7
M4x0.7
0.1575
0.01349
1,619
1,133
38.2
26.8
28.7
20.1
M5x0.8
0.1970
0.02201
2,641
1,849
78.0
54.6
58.5
41.0
M6x1.0
0.2360
0.03116
3,739
2,617
132.3
92.6
99.3
69.5
M7x1.0
0.2755
0.04473
5,368
3,758
221.8
155.3
166.4
116.5
M8x1.25
0.3150
0.05673
6,808
4,765
321.7
225.2
241.2
168.9
M10x1.5
0.3940
0.08990
10,788
7,552
637.6
446.3
478.2
334.7
M12x1.75
0.4720
0.13067
15,680
10,976
1110.2
777.1
832.6
582.8

Go the Material Strength (Part 2)

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