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According to ASME B18.2.1, bolt length shall be the distance measured parallel to the axis of the bolt from the bearing surface of the head to the extreme end of the bolt, including the point if the bolt is pointed. The length tolerances for bolts are listed in below tables.
Nominal Length, L | Nominal Size | ||
1/4" ~ 3/8" | 7/16" & 1/2" | 9/16" ~ 3/4" | |
L ≤ 1“ | +0.02 −0.03 | +0.02 −0.03 | +0.02 −0.03 |
1" < L ≤ 2-1/2" | +0.02 −0.04 | +0.04 −0.06 | +0.06 −0.08 |
2-1/2" < L ≤ 4" | +0.04 −0.06 | +0.06 −0.08 | +0.08 −0.10 |
4" < L ≤ 6" | +0.06 −0.10 | +0.08 −0.10 | +0.10 −0.10 |
L > 6" | +0.10 −0.18 | +0.12 −0.18 | +0.14 −0.18 |
Nominal Length, L | Nominal Size | ||
7/8" & 1" | 1-1/8" ~ 1-1/2" | ≥ 1-1/2" | |
L ≤ 1“ | ... ... | ... ... | ... ... |
1" < L ≤ 2-1/2" | +0.08 −0.10 | +0.12 −0.12 | +0.18 −0.18 |
2-1/2" < L ≤ 4" | +0.10 −0.14 | +0.16 −0.16 | +0.20 −0.20 |
4" < L ≤ 6" | +0.12 −0.16 | +0.18 −0.18 | +0.22 −0.22 |
L > 6" | +0.16 −0.20 | +0.22 −0.22 | +0.24 −0.24 |