Carriage Bolts

Carriage bolts are round-head fasteners for joining soft wood, plastic, and metal components in pre-drilled assemblies. Their smooth, slot-free heads and square necks support fastening work with nuts, making them useful for commercial assembly, maintenance, repair, and fastener-stocking needs.

Product Display:
Helpful Buying Guide

Carriage Bolt Buying Guide

Compare carriage bolts by the thread and length required for the assembly, then confirm the material, finish, head style, and pack quantity that fit the work planned. The represented selection includes inch UNC sizes and an M12 metric size, with steel, zinc-finished steel, and stainless steel options.

Visual Guide

Popular examples in this category

1/2-13 x 6 in. 18-8 Stainless Steel Round Head Carriage Bolts, Pack of 251/2-13 x 6 in. 18-8 Stainless Steel Round Head Carriage Bolts, Pack of 25WBB21989211/4-20 x 3/4 in. Round Head Zinc-Plated Steel Carriage Bolts, 250-Pack1/4-20 x 3/4 in. Round Head Zinc-Plated Steel Carriage Bolts, 250-PackWBB21009815/8-11 x 6-1/2 in. Round Head Steel Carriage Bolts, Grade 5, Pack of 255/8-11 x 6-1/2 in. Round Head Steel Carriage Bolts, Grade 5, Pack of 25WBB21989241/4-20 x 2-1/2 in. Steel Zinc CR+3 Round Head Carriage Bolts, 100-Pack1/4-20 x 2-1/2 in. Steel Zinc CR+3 Round Head Carriage Bolts, 100-PackWBB2101182
Use Cases

Join pre-drilled components

Carriage bolts are represented for fastening soft wood, plastic, and metal components. They are used with compatible nuts to complete bolted connections.

How to Choose

Match size before material

Start with the required thread and bolt length, such as 1/4-20, 3/8-16, 7/16-14, 1/2-13, 5/8-11, or M12-1.75. Confirm that the selected size matches the pre-drilled assembly and compatible nut.

Applications

Support assembly and repair work

Available pack counts support different purchasing needs, from 10-piece installation or replenishment quantities to 25-, 50-, 100-, and 250-count packs for repeated fastening, maintenance, and inventory needs.

Additional Information

Understand the carriage-bolt design

The broad round head helps reduce pull-through in soft wood, plastic, and metal. A square neck grips the substrate to help keep the bolt from turning as the nut is tightened.

1/4-20 to 5/8-11Inch thread range represented

Multiple UNC thread sizes are available for matching fastening requirements.

M12-1.75Metric size represented

A 100 mm metric carriage-bolt option is included in the selection.

10 to 250Pack quantities represented

Choose from quantities suited to replenishment, projects, or inventory needs.

Steel or stainless steelConstruction options

The range includes steel, zinc-finished steel, 18-8 stainless steel, and 304 stainless steel products.

Comparison Guide

Compare represented carriage-bolt options

Use this overview to narrow options by thread format, material or finish, and available sizes or pack quantities.

Product typeThread and size examplesMaterial, finish, and quantity examples
Inch-thread steel carriage bolts1/4-20 x 3/4 in.; 1/4-20 x 1-1/2 in.; 1/4-20 x 2-1/2 in.; 3/8-16 x 1-1/2 in.Steel with zinc CR+3 finish; individual, 100-pack, and 250-pack options represented
Grade 5 steel carriage bolts7/16-14 x 1-1/4 in.; 7/16-14 x 1-1/2 in.; 1/2-13 x 1 in.; 5/8-11 x 6-1/2 in.Zinc-plated or zinc-finished steel options; 25- or 50-pack options represented
Stainless steel and metric carriage bolts3/8-16 x 5 in.; 3/8-16 x 6 in.; 1/2-13 x 6 in.; M12-1.75 x 100 mm18-8 or 304 stainless steel options, plus a zinc-plated steel metric option; 10-, 25-, and 50-pack options represented
Planning Guide

Plan the right fit before choosing

1. Confirm thread and length

Select the fastening size your assembly requires

Carriage bolts must match the thread requirement and the planned bolt length for the connection. The represented inch-thread options range from 1/4-20 through 5/8-11, with lengths from 3/4 inch to 6-1/2 inches. An M12-1.75 x 100 mm option is also represented.

  • Match UNC thread sizes with compatible nuts.
  • Compare the listed bolt length with the planned assembly requirement.
  • Use the specified metric size when the assembly calls for M12-1.75 x 100 mm hardware.
2. Compare construction and finish

Choose steel or stainless steel based on the listed product configuration

The selection includes steel carriage bolts, steel bolts with zinc CR+3 or zinc-plated finishes, and 18-8 or 304 stainless steel options. Stainless steel products are represented with corrosion resistance and long-lasting durability, while zinc-finished steel options provide the specified finished surface.

  • Choose 18-8 or 304 stainless steel when those listed material properties are needed.
  • Select zinc CR+3 or zinc-plated steel when the specified finish is required.
  • Verify the grade designation where it is listed, including Grade 5 options.
3. Plan quantity for the job

Buy the pack count that suits installation or inventory needs

Pack sizes in the represented range include 10, 25, 50, 100, and 250 bolts. Smaller packs can suit installation or replenishment, while larger counts can help support repeat fastening and inventory stocking.

  • 10-count packs are represented for installation or replenishment.
  • 25- and 50-count packs support planned assembly, maintenance, and repair work.
  • 100- and 250-count packs support stocking and repeated fastening needs.
FAQ

Common questions before buying

What materials can these carriage bolts fasten?

Represented products are intended for fastening soft wood, plastic, and metal components in pre-drilled assemblies.

Why do carriage bolts have a square neck?

The square neck grips the substrate to help keep the bolt from turning while the nut is tightened.

What thread types are represented?

The selection includes UNC inch threads from 1/4-20 through 5/8-11, plus an M12-1.75 metric option.

What pack sizes are available?

Represented quantities include individual bolts and packs of 10, 25, 50, 100, and 250.

Helpful Buying Guide

Carriage Bolt Buying Guide

Compare carriage bolts by the thread and length required for the assembly, then confirm the material, finish, head style, and pack quantity that fit the work planned. The represented selection includes inch UNC sizes and an M12 metric size, with steel, zinc-finished steel, and stainless steel options.

Visual Guide

Popular examples in this category

1/2-13 x 6 in. 18-8 Stainless Steel Round Head Carriage Bolts, Pack of 251/2-13 x 6 in. 18-8 Stainless Steel Round Head Carriage Bolts, Pack of 25WBB21989211/4-20 x 3/4 in. Round Head Zinc-Plated Steel Carriage Bolts, 250-Pack1/4-20 x 3/4 in. Round Head Zinc-Plated Steel Carriage Bolts, 250-PackWBB21009815/8-11 x 6-1/2 in. Round Head Steel Carriage Bolts, Grade 5, Pack of 255/8-11 x 6-1/2 in. Round Head Steel Carriage Bolts, Grade 5, Pack of 25WBB21989241/4-20 x 2-1/2 in. Steel Zinc CR+3 Round Head Carriage Bolts, 100-Pack1/4-20 x 2-1/2 in. Steel Zinc CR+3 Round Head Carriage Bolts, 100-PackWBB2101182
Use Cases

Join pre-drilled components

Carriage bolts are represented for fastening soft wood, plastic, and metal components. They are used with compatible nuts to complete bolted connections.

How to Choose

Match size before material

Start with the required thread and bolt length, such as 1/4-20, 3/8-16, 7/16-14, 1/2-13, 5/8-11, or M12-1.75. Confirm that the selected size matches the pre-drilled assembly and compatible nut.

Applications

Support assembly and repair work

Available pack counts support different purchasing needs, from 10-piece installation or replenishment quantities to 25-, 50-, 100-, and 250-count packs for repeated fastening, maintenance, and inventory needs.

Additional Information

Understand the carriage-bolt design

The broad round head helps reduce pull-through in soft wood, plastic, and metal. A square neck grips the substrate to help keep the bolt from turning as the nut is tightened.

1/4-20 to 5/8-11Inch thread range represented

Multiple UNC thread sizes are available for matching fastening requirements.

M12-1.75Metric size represented

A 100 mm metric carriage-bolt option is included in the selection.

10 to 250Pack quantities represented

Choose from quantities suited to replenishment, projects, or inventory needs.

Steel or stainless steelConstruction options

The range includes steel, zinc-finished steel, 18-8 stainless steel, and 304 stainless steel products.

Comparison Guide

Compare represented carriage-bolt options

Use this overview to narrow options by thread format, material or finish, and available sizes or pack quantities.

Product typeThread and size examplesMaterial, finish, and quantity examples
Inch-thread steel carriage bolts1/4-20 x 3/4 in.; 1/4-20 x 1-1/2 in.; 1/4-20 x 2-1/2 in.; 3/8-16 x 1-1/2 in.Steel with zinc CR+3 finish; individual, 100-pack, and 250-pack options represented
Grade 5 steel carriage bolts7/16-14 x 1-1/4 in.; 7/16-14 x 1-1/2 in.; 1/2-13 x 1 in.; 5/8-11 x 6-1/2 in.Zinc-plated or zinc-finished steel options; 25- or 50-pack options represented
Stainless steel and metric carriage bolts3/8-16 x 5 in.; 3/8-16 x 6 in.; 1/2-13 x 6 in.; M12-1.75 x 100 mm18-8 or 304 stainless steel options, plus a zinc-plated steel metric option; 10-, 25-, and 50-pack options represented
Planning Guide

Plan the right fit before choosing

1. Confirm thread and length

Select the fastening size your assembly requires

Carriage bolts must match the thread requirement and the planned bolt length for the connection. The represented inch-thread options range from 1/4-20 through 5/8-11, with lengths from 3/4 inch to 6-1/2 inches. An M12-1.75 x 100 mm option is also represented.

  • Match UNC thread sizes with compatible nuts.
  • Compare the listed bolt length with the planned assembly requirement.
  • Use the specified metric size when the assembly calls for M12-1.75 x 100 mm hardware.
2. Compare construction and finish

Choose steel or stainless steel based on the listed product configuration

The selection includes steel carriage bolts, steel bolts with zinc CR+3 or zinc-plated finishes, and 18-8 or 304 stainless steel options. Stainless steel products are represented with corrosion resistance and long-lasting durability, while zinc-finished steel options provide the specified finished surface.

  • Choose 18-8 or 304 stainless steel when those listed material properties are needed.
  • Select zinc CR+3 or zinc-plated steel when the specified finish is required.
  • Verify the grade designation where it is listed, including Grade 5 options.
3. Plan quantity for the job

Buy the pack count that suits installation or inventory needs

Pack sizes in the represented range include 10, 25, 50, 100, and 250 bolts. Smaller packs can suit installation or replenishment, while larger counts can help support repeat fastening and inventory stocking.

  • 10-count packs are represented for installation or replenishment.
  • 25- and 50-count packs support planned assembly, maintenance, and repair work.
  • 100- and 250-count packs support stocking and repeated fastening needs.
FAQ

Common questions before buying

What materials can these carriage bolts fasten?

Represented products are intended for fastening soft wood, plastic, and metal components in pre-drilled assemblies.

Why do carriage bolts have a square neck?

The square neck grips the substrate to help keep the bolt from turning while the nut is tightened.

What thread types are represented?

The selection includes UNC inch threads from 1/4-20 through 5/8-11, plus an M12-1.75 metric option.

What pack sizes are available?

Represented quantities include individual bolts and packs of 10, 25, 50, 100, and 250.

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