Torque Ratings for Grade 5 and Grade 8 Fasteners
To determine what fastener is right for the job, you must be able to identify what grade fastener and torque rating you are using. Fasteners are graded by tensile strength and are easily identified by the number of slash marks on the head of the fastener. Torque is measured in foot pounds.
- Grade 5 fasteners have 3 lines or markings on the head resembling the shape of a “Y"
- Grade 8 fasteners have 6 lines or markings on the head as displayed in the figure below
Thread Size | SAE GRADE 575% YIELD STRENGTH (PSI) =69000 | SAE GRADE 875% YIELD STRENGTH (PSI) = 98000 | ||
---|---|---|---|---|
PLAINFT. LBS. | ZINC PLATEDFT. LBS. | PLAINFT. LBS. | ZINC PLATEDFT. LBS. | |
1/4 - 20 | 9 | 10 | 13 | 14 |
1/4 - 28 | 10 | 12 | 15 | 16 |
5/16 - 18 | 19 | 21 | 27 | 29 |
5/16 - 24 | 21 | 23 | 30 | 33 |
3/8 - 16 | 33 | 37 | 47 | 52 |
3/8 - 24 | 38 | 42 | 54 | 59 |
7/16 - 14 | 53 | 59 | 76 | 83 |
7/16 - 24 | 60 | 66 | 85 | 93 |
1/2 - 13 | 82 | 90 | 116 | 127 |
1/2 - 20 | 92 | 101 | 131 | 144 |
9/16 - 12 | 118 | 129 | 167 | 184 |
9/16 - 18 | 131 | 144 | 186 | 205 |
5/8 - 11 | 162 | 179 | 231 | 254 |
5/8 - 14 | 184 | 202 | 261 | 287 |
3/4 - 10 | 288 | 317 | 409 | 450 |
3/4 - 16 | 322 | 354 | 457 | 503 |
SAE Grade 575% Yield Strength (PSI) = 69000
Plainft. lbs.: 9
Zinc Platedft. lbs.: 10
SAE Grade 875% Yield Strength (PSI) = 98000
Plainft. lbs.: 13
Zinc Platedft. lbs.: 14
Thread Size: 1/4 - 28
SAE Grade 575% Yield Strength (PSI) = 69000
Plainft. lbs.: 10
Zinc Platedft. lbs.: 12
SAE Grade 875% Yield Strength (PSI) = 98000
Plainft. lbs.: 15
Zinc Platedft. lbs.: 16
Thread Size: 5/16 - 18
SAE Grade 575% Yield Strength (PSI) = 69000
Plainft. lbs.: 19
Zinc Platedft. lbs.: 21
SAE Grade 875% Yield Strength (PSI) = 98000
Plainft. lbs.: 27
Zinc Platedft. lbs.: 29
Thread Size: 5/16 - 24
SAE Grade 575% Yield Strength (PSI) = 69000
Plainft. lbs.: 21
Zinc Platedft. lbs.: 23
SAE Grade 875% Yield Strength (PSI) = 98000
Plainft. lbs.: 30
Zinc Platedft. lbs.: 33
Thread Size: 3/8 - 16
SAE Grade 575% Yield Strength (PSI) = 69000
Plainft. lbs.: 33
Zinc Platedft. lbs.: 37
SAE Grade 875% Yield Strength (PSI) = 98000
Plainft. lbs.: 47
Zinc Platedft. lbs.: 52
Thread Size: 3/8 - 24
SAE Grade 575% Yield Strength (PSI) = 69000
Plainft. lbs.: 38
Zinc Platedft. lbs.: 42
SAE Grade 875% Yield Strength (PSI) = 98000
Plainft. lbs.: 54
Zinc Platedft. lbs.: 59
Thread Size: 7/16 - 14
SAE Grade 575% Yield Strength (PSI) = 69000
Plainft. lbs.: 53
Zinc Platedft. lbs.: 59
SAE Grade 875% Yield Strength (PSI) = 98000
Plainft. lbs.: 76
Zinc Platedft. lbs.: 83
Thread Size: 7/16 - 24
SAE Grade 575% Yield Strength (PSI) = 69000
Plainft. lbs.: 60
Zinc Platedft. lbs.: 66
SAE Grade 875% Yield Strength (PSI) = 98000
Plainft. lbs.: 85
Zinc Platedft. lbs.: 93
Thread Size: 1/2 - 13
SAE Grade 575% Yield Strength (PSI) = 69000
Plainft. lbs.: 82
Zinc Platedft. lbs.: 90
SAE Grade 875% Yield Strength (PSI) = 98000
Plainft. lbs.: 116
Zinc Platedft. lbs.: 127
Thread Size: 1/2 - 20
SAE Grade 575% Yield Strength (PSI) = 69000
Plainft. lbs.: 92
Zinc Platedft. lbs.: 101
SAE Grade 875% Yield Strength (PSI) = 98000
Plainft. lbs.: 131
Zinc Platedft. lbs.: 144
Thread Size: 9/16 - 12
SAE Grade 575% Yield Strength (PSI) = 69000
Plainft. lbs.: 118
Zinc Platedft. lbs.: 129
SAE Grade 875% Yield Strength (PSI) = 98000
Plainft. lbs.: 167
Zinc Platedft. lbs.: 184
Thread Size: 9/16 - 18
SAE Grade 575% Yield Strength (PSI) = 69000
Plainft. lbs.: 131
Zinc Platedft. lbs.: 144
SAE Grade 875% Yield Strength (PSI) = 98000
Plainft. lbs.: 186
Zinc Platedft. lbs.: 205
Thread Size: 5/8 - 11
SAE Grade 575% Yield Strength (PSI) = 69000
Plainft. lbs.: 162
Zinc Platedft. lbs.: 179
SAE Grade 875% Yield Strength (PSI) = 98000
Plainft. lbs.: 231
Zinc Platedft. lbs.: 254
Thread Size: 5/8 - 14
SAE Grade 575% Yield Strength (PSI) = 69000
Plainft. lbs.: 184
Zinc Platedft. lbs.: 202
SAE Grade 875% Yield Strength (PSI) = 98000
Plainft. lbs.: 261
Zinc Platedft. lbs.: 287
Thread Size: 3/4 - 10
SAE Grade 575% Yield Strength (PSI) = 69000
Plainft. lbs.: 288
Zinc Platedft. lbs.: 317
SAE Grade 875% Yield Strength (PSI) = 98000
Plainft. lbs.: 409
Zinc Platedft. lbs.: 450
Thread Size: 3/4 - 16
SAE Grade 575% Yield Strength (PSI) = 69000
Plainft. lbs.: 322
Zinc Platedft. lbs.: 354
SAE Grade 875% Yield Strength (PSI) = 98000
Plainft. lbs.: 457
Zinc Platedft. lbs.: 503