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ASME B18.2.1 Length Tolerances for Bolts
July 19, 2019
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.
Length Tolerances for Nominal Sizes 1/4″ to 3/4″
| 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 |
Length Tolerances for Nominal Sizes 7/8″ to 1-1/2″ and Over
| 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 |
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