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- Identification of Most Commonly Used Grades of Bolts -

Use Standard Torque Settings When Specific Values Are Not Specified.
(C) = Coarse thread, (F) = Fine thread

Hardness è

No lines = Grade 3

No lines = Grade 3 bolt

3 lines = Grade 5

3 lines = Grade 5 bolt

6 lines = Grade 8

6 lines = Grade 8 bolt

Stainless Steel /
Special Alloy
Stainless Steel / Special Alloy bolts

Bolt Size

â

Material: Low Carbon Steel. Tensile Strength: 85,000 p.s.i. (Low Strength)

Material: Medium Carbon Steel, Tempered. Tensile Strength: 120,000 p.s.i. (Medium Strength)

Material: Medium Carbon Alloy Steel, Quenched and Tempered. Tensile Strength: 150,000 p.s.i. (High Strength)

18-8 [304] Stainless Steel

 
 1/4-20 (C)
 1/4-28 (F)
5/16-18 (C)
5/16-24 (F)
 3/8-16 (C)
 3/8-24 (F)
7/16-14 (C)
7/16-20 (F)
 1/2-13 (C)
 1/2-20 (F)
9/16-12 (C)
9/16-18 (F)
 5/8-11 (C)
 5/8-18 (F)
 3/4-10 (C)
 3/4-16 (F)

 70 in. lb./ 6 ft. lb.
 85 in. lb./ 7 ft. lb.
150 in. lb./13 ft. lb.
165 in. lb./14 ft. lb.
260 in. lb./22 ft. lb.
300 in. lb./25 ft. lb.
 35 ft. lb.
 45 ft. lb.
 50 ft. lb.
 70 ft. lb.
 75 ft. lb.
100 ft. lb.
110 ft. lb.
140 ft. lb.
150 ft. lb.
200 ft. lb.

115 in. lb./10 ft. lb.
140 in. lb./12 ft. lb.
250 in. lb./21 ft. lb.
270 in. lb./23 ft. lb.
 35 ft. lb.
 40 ft. lb.
 55 ft. lb.
 75 ft. lb.
 80 ft. lb.
105 ft. lb.
125 ft. lb.
165 ft. lb.
180 ft. lb.
230 ft. lb.
245 ft. lb.
325 ft. lb.

165 in. lb./14 ft. lb.
200 in. lb./17 ft. lb.
350 in. lb./29 ft. lb.
 30 ft. lb.
 50 ft. lb.
 60 ft. lb.
 80 ft. lb.
105 ft. lb.
115 ft. lb.
165 ft. lb.
175 ft. lb.
230 ft. lb.
260 ft. lb.
330 ft. lb.
350 ft. lb.
470 ft. lb.

 14 ft. lb.
 17 ft. lb.
 29 ft. lb.
 35 ft. lb.
 58 ft. lb.
 69 ft. lb.
 98 ft. lb.
110 ft. lb.
145 ft. lb.
160 ft. lb.
200 ft. lb.
220 ft. lb.
280 ft. lb.
310 ft. lb.
490 ft. lb.
530 ft. lb.

Compliments of Brian Miller