» Technical » ASME B18.2.1 Length Tolerances for Bolts

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
*All values are in inch.

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
*All values are in inch.

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