ASME B18.2.1 Length Tolerance Chart for Bolts and Screws

Length Tolerances for Bolts

Nomianal Length Nominal Size
1/4 to 3/8 7/16 and 1/2 9/16 to 3/4 7/8 to 1 1 1/8 to 1 1/2 Over 1 1/2
Up to 1 in., incl. +0.02
-0.03		 +0.02
-0.03		 +0.02
-0.03		 ...
...		 ...
...		 ...
...
Over 1 in. to 2 1/2 in., incl. +0.02
-0.04		 +0.04
-0.06		 +0.06
-0.08		 +0.08
-0.10		 +0.12
-0.12		 +0.18
-0.18
Over 2 1/2 in. to 4 in., incl. +0.04
-0.06		 +0.06
-0.08		 +0.08
-0.10		 +0.10
-0.14		 +0.16
-0.16		 +0.20
-0.20
Over 4 in. to 6 in., incl. +0.06
-0.10		 +0.08
-0.10		 +0.10
-0.10		 +0.12
-0.16		 +0.18
-0.18		 +0.22
-0.22
Longer than 6 in. +0.10
-0.18		 +0.12
-0.18		 +0.14
-0.18		 +0.16
-0.20		 +0.22
-0.22		 +0.24
-0.24

Length Tolerances for Screws

Nomianal Length Nominal Size
1/4 to 3/8 7/16 and 1/2 9/16 to 3/4 7/8 to 1 1 1/8 to 1 1/2 Over 1 1/2
Up to 1 in., incl. +0.00
-0.03		 +0.00
-0.03		 +0.00
-0.03		 ...
...		 ...
...		 ...
...
Over 1 in. to 2 1/2 in., incl. +0.00
-0.04		 +0.00
-0.06		 +0.00
-0.08		 +0.00
-0.10		 +0.00
-0.12		 +0.00
-0.18
Over 2 1/2 in. to 4 in., incl. +0.00
-0.06		 +0.00
-0.08		 +0.00
-0.010		 +0.00
-0.14		 +0.00
-0.16		 +0.00
-0.20
Over 4 in. to 6 in., incl. +0.00
-0.10		 +0.00
-0.10		 +0.00
-0.10		 +0.00
-0.16		 +0.00
-0.18		 +0.00
-0.22
Longer than 6 in. +0.00
-0.18		 +0.00
-0.18		 +0.00
-0.18		 +0.00
-0.20		 +0.00
-0.22		 +0.00
-0.24