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Cap Head Bolts

Cap Head Bolts

The wide head on these bolts provides a large bearing surface for distributing loads.

Hex

Also known as structural bolts, these bolts have an extra-wide bearing surface for better load distribution. The head can be turned with a wrench or countersunk to hold in place while threading on a nut.

A325 Plain Steel

1/2"-13

5/8"-11

3/4"-10

7/8"-9

1"-8

1 1/8"-7

1 1/4"-7

A490 Plain Steel

5/8"-11

3/4"-10

7/8"-9

1"-8

1 1/8"-7

A325 Galvanized Steel

1/2"-13

5/8"-11

3/4"-10

7/8"-9

1"-8

1 1/8"-7

1 1/4"-7

Grade 8 Plain Alloy Steel

1/4"-20

5/16"-18

3/8"-16

7/16"-14

1/2"-13

1/2"-20

5/8"-11

5/8"-18

3/4"-10

3/4"-16

1"-8

Grade 8 Zinc Plated Alloy Steel

1/4"-20

5/16"-18

3/8"-16

7/16"-14

1/2"-13

5/8"-11

Square

Compared to hex heads, square heads are easier to grip with a wrench and easier to align with materials being fastened. They can also be countersunk to hold in place while threading on a nut.

18-8 Stainless Steel

1/2"-13

3/4"-10

4140 Steel — Black Oxide Grade 5

1/2"-13

3/4"-10

3/8"-16

5/8"-11

Alloy Steel — Plain Grade 8

3/4"-10

Steel — Black Oxide Grade 5

1/2"-13

3/8"-16

5/8"-11

T-Head

Fit these T-head bolts into T-slots for a secure hold. They're commonly used in clamping applications.

4140 Steel — Black Oxide Grade 8

1"-8

Steel — Black Oxide Grade 5

1"-8

1/2"-13

3/4"-10

Steel — Plain Grade 5

1/2"-13

3/4"-10

3/8"-16

Socket Tip

Also known as Una Drive bolts, these bolts have a socket tip that accepts a hex wrench. They're commonly used for freight car assembly and maintenance.

Steel — Zinc Plated Grade A325

5/8"-11

Camrail

Designed for freight car assembly and repair, Camrail bolts form a secure joint.

Lubricated Grade 8 Alloy Steel

3/4"-10

7/8"-9