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Chapter 7
Steel Fasteners
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MECHANICAL PROPERTIES
OF CARBON STEEL BOLTING & OTHER FASTNERS
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Full Sizea |
Machine Specimensb |
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SAE |
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Tensile |
Yield |
Tensile |
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Surface |
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J429 |
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Nominal Size |
Strength |
Strength |
Strength |
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Hardness |
Core |
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Grade |
Products |
Diameter in |
ksi |
ksi |
ksi |
% El |
% R.A. |
HR30N |
Hardness |
| 1 |
B, Sc, St |
1/4 thru 1 1/2 |
60 |
36 |
60 |
18 |
35 |
--- |
70-100 HRB |
| 2 |
B, Sc, St |
1/4 thru 3/4 |
74 |
57 |
74 |
18 |
35 |
--- |
80-100 HRB |
| 2 |
B, Sc, St |
>3/4 thru 1 1/2 |
60 |
36 |
60 |
18 |
35 |
--- |
70-100 HRB |
| 4 |
St |
1/4 thru 1 1/2 |
115 |
100 |
115 |
10 |
35 |
--- |
22-32 HRC |
| 5 |
B, Sc, St |
1/4 thru 1 |
120 |
92 |
120 |
14 |
35 |
54 |
25-34 HRC |
| 5 |
B, Sc, St |
>1 thru 1 1/2 |
105 |
81 |
105 |
14 |
35 |
50 |
19-30 HRC |
| 5.1 |
Se, B, Sc |
No. 6 thru 5/8 |
120 |
--- |
--- |
--- |
--- |
59.5 |
25-40 HRC |
| 5.2 |
B, Sc |
1/4 thru 1 |
120 |
92 |
120 |
14 |
35 |
56 |
26-36 HRC |
| 7 |
B, Sc |
1/4 thru 1 1/2 |
133 |
115 |
133 |
12 |
35 |
54 |
28-34 HRC |
| 8 |
B, Sc, St |
1/4 thru 1 1/2 |
150 |
130 |
150 |
12 |
35 |
58.6 |
33-39 HRC |
| 8.1 |
St |
1/4 thru 1 1/2 |
150 |
130 |
150 |
10 |
35 |
--- |
32-38 HRC |
| 8.2 |
B, Sc |
1/4 thru 1 |
150 |
130 |
150 |
10 |
35 |
58.6 |
33-39 HRC |
| a.
Full size bolts, screws, studs and screw & washer assemblies; for proof load
requirements see SAE J429 Table 1. |
| b.
Mchine test specimens of bolts, screws and studs. |
| c.
Other requirements apply, see SAE J 429 Table 1 footnotes for details. |
| B
- Bolts; Sc - Screws; St - Studs; Se - Screw & Washer assembly. |
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