B/Standard Bolt Torque Specifications — Standard Bolt Torque Specifications How to Determine Bolt Strength, page 2

B-2

STANDARD BOLT TORQUE SPECIFICATIONS

STANDARD BOLT TORQUE SPECIFICATIONS
HOW TO DETERMINE BOLT STRENGTH

Hexagon
head bolt

Mark

Bolt
head No.

4-
5-
6-
7-

Class

4T
5T
6T
7T

Stud bolt

Mark

No mark

Class

4T

No mark

4T

Hexagon
flange bolt
w/washer
hexagon bolt

No mark

4T

Grooved

6T

Hexagon
head bolt

Two
protruding
lines

5T

Hexagon
flange bolt
w/washer
hexagon bolt

Two
protruding
lines

6T

Welded bolt

4T

Hexagon
head bolt

Three
protruding
lines

7T