Material
Strengths (Part 2)
Material strength for industrial machine screws from Leland Powell Fasteners is listed below by grade, type and class and is separated into 130,000 psi and 150,000.
Material
Strength - 130,000 psi
Class 9.8 |
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 |
1,820 |
1,274 |
44.8 |
31.3 |
33.6 |
23.5 |
10-24 |
0.1900 |
0.01750 |
2,275 |
1,593 |
64.8 |
45.4 |
48.6 |
34.0 |
10-32 |
0.1900 |
0.02000 |
2,600 |
1,820 |
74.1 |
51.9 |
55.6 |
38.9 |
1/4-20 |
0.2500 |
0.03180 |
4,134 |
2,894 |
155.0 |
108.5 |
116.3 |
81.4 |
1/4-28 |
0.2500 |
0.03637 |
4,728 |
3,310 |
177.3 |
124.1 |
133.0 |
93.1 |
5/16-18 |
0.3125 |
0.05240 |
6,812 |
4,768 |
319.3 |
223.5 |
239.5 |
167.6 |
5/16-24 |
0.3125 |
0.05800 |
7,540 |
5,278 |
353.4 |
247.4 |
265.1 |
185.6 |
3/8-16 |
0.3750 |
0.07750 |
10,075 |
7,053 |
566.7 |
396.7 |
425.0 |
297.5 |
3/8-24 |
0.3750 |
0.08780 |
11,414 |
7,990 |
642.0 |
449.4 |
481.5 |
337.1 |
7/16-14 |
0.4375 |
0.10630 |
13,819 |
9,673 |
906.9 |
634.8 |
680.2 |
476.1 |
7/16-20 |
0.4375 |
0.11870 |
15,431 |
10,802 |
1012.7 |
708.9 |
759.5 |
531.6 |
M3.5x0.6 |
0.1380 |
0.01051 |
1,366 |
956 |
28.3 |
19.8 |
21.2 |
14.8 |
M4x0.7 |
0.1575 |
0.01349 |
1,754 |
1,228 |
41.4 |
29.0 |
31.1 |
21.8 |
M5x0.8 |
0.1970 |
0.02201 |
2,861 |
2,003 |
84.6 |
59.2 |
63.4 |
44.4 |
M6x1.0 |
0.2360 |
0.03116 |
4,050 |
2,835 |
143.4 |
100.4 |
107.5 |
75.3 |
M7x1.0 |
0.2755 |
0.04473 |
,5815 |
4,071 |
240.3 |
168.2 |
180.2 |
126.2 |
M8x1.25 |
0.3150 |
0.05673 |
7,375 |
5,162 |
348.5 |
243.9 |
261.3 |
182.9 |
M10x1.5 |
0.3940 |
0.08990 |
11,687 |
8,181 |
690.7 |
483.5 |
518.0 |
362.6 |
M12x1.75 |
0.4720 |
0.13067 |
16,987 |
11,891 |
1202.7 |
841.9 |
902.0 |
631.4 |
Material
Strength - 150,000 psi
Class 10.9 or Grade 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 |
2,100 |
1,680 |
51.7 |
41.3 |
38.7 |
31.0 |
10-24 |
0.1900 |
0.01750 |
2,625 |
2,100 |
74.8 |
59.9 |
56.1 |
44.9 |
10-32 |
0.1900 |
0.02000 |
3,000 |
2,400 |
85.5 |
68.4 |
64.1 |
51.3 |
1/4-20 |
0.2500 |
0.03180 |
4,770 |
3,816 |
178.9 |
143.1 |
134.2 |
107.3 |
1/4-28 |
0.2500 |
0.03637 |
5,456 |
4,364 |
204.6 |
163.7 |
153.4 |
122.7 |
5/16-18 |
0.3125 |
0.05240 |
7,860 |
6,288 |
368.4 |
294.8 |
276.3 |
221.1 |
5/16-24 |
0.3125 |
0.05800 |
8,700 |
6,960 |
407.8 |
326.3 |
305.9 |
244.7 |
3/8-16 |
0.3750 |
0.07750 |
11,625 |
9,300 |
653.9 |
523.1 |
490.4 |
392.3 |
3/8-24 |
0.3750 |
0.08780 |
13,170 |
10,536 |
740.8 |
592.7 |
555.6 |
444.5 |
7/16-14 |
0.4375 |
0.10630 |
15,945 |
12,756 |
1046.4 |
837.1 |
784.8 |
627.8 |
7/16-20 |
0.4375 |
0.11870 |
17,805 |
14,244 |
1168.5 |
934.8 |
876.3 |
701.1 |
M3.5x0.6 |
0.1380 |
0.01051 |
1,577 |
1,261 |
32.6 |
26.1 |
24.5 |
19.6 |
M4x0.7 |
0.1575 |
0.01349 |
2,024 |
1,619 |
47.8 |
38.2 |
35.9 |
28.7 |
M5x0.8 |
0.1970 |
0.02201 |
3,302 |
2,641 |
97.6 |
78.0 |
73.2 |
58.5 |
M6x1.0 |
0.2360 |
0.03116 |
4,673 |
3,739 |
165.4 |
132.3 |
124.1 |
99.3 |
M7x1.0 |
0.2755 |
0.04473 |
6,710 |
5,368 |
277.3 |
221.8 |
208.0 |
166.4 |
M8x1.25 |
0.3150 |
0.05673 |
8,510 |
6,808 |
402.1 |
321.7 |
301.6 |
241.2 |
M10x1.5 |
0.3940 |
0.08990 |
13,485 |
10,788 |
797.0 |
637.6 |
597.7 |
478.2 |
M12x1.75 |
0.4720 |
0.13067 |
19,601 |
15,680 |
1387.7 |
1110.2 |
1040.8 |
832.6 |
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to Material Strengths (Part 1)
|
