B/Standard Bolt Torque Specifications, page 2

STANDARD BOLT TORQUE SPECIFICATIONS

HOW TO DETERMINE BOLT STRENGTH

Hexagon head bolt
[Diagram of hexagon bolt with "4" marking]
Mark    Class
4-      4T
5-      5T
Bolt head No. 6-      6T
7-      7T
8-      8T
9-      9T
10-     10T
11-     11T

[Diagram of hexagon bolt]
No mark    4T

Hexagon flange bolt w/ washer hexagon bolt
[Diagram of hexagon flange bolt]
No mark    4T

Hexagon head bolt
[Diagram of hexagon bolt with two protruding lines]
Two protruding lines    5T

Hexagon flange bolt w/ washer hexagon bolt
[Diagram of hexagon flange bolt with two protruding lines]
Two protruding lines    6T

Hexagon head bolt
[Diagram of hexagon bolt with three protruding lines]
Three protruding lines    7T

Hexagon head bolt
[Diagram of hexagon bolt with four protruding lines]
Four protruding lines    8T

Stud bolt
[Diagram of stud bolt]
No mark    4T

[Diagram of grooved stud bolt]
Grooved    6T

Welded bolt
[Diagram of welded bolt]
4T