Round head, square neck locks in fittings
The rounded head sits smooth on the outside face, and the square neck seats in the fitting's square hole so the bolt cannot spin as the nut goes on.
Bolts & Fittings
Carriage Bolt
Carriage Bolt is a round-headed bolt with a square neck under the head that locks into square holes of fence fittings so the bolt cannot turn while the nut is tightened. In fencing it fixes tension bands, brace bands and rail ends to chain-link posts and pales to palisade rails. It is also known as a coach bolt or carriage bolt. Specify the diameter, length, finish and the quantity you need.
At a glance
Carriage Bolt at a glance.
5/16 and 3/8 in for fence fittings
1/4 to 1/2 in (M6 to M12), 1-1/4 to 12 in (25 to 300 mm) long, UNC or metric coarse thread, Grade 2 or Grade 5 (Class 4.6 or 8.8), hot dip galvanized.
Attaches tension and bracing components
Fixes tension bands and brace bands to terminal posts, rail ends to posts, and palisade pales to their rails.
Square neck locks the bolt in place
Push the carriage bolt through the fitting hole; the square neck seats and prevents rotation. Thread the nut onto the exposed end and tighten. The bolt remains fixed while the nut draws components together under tension, securing bands and fittings against movement.
Choosing between
Carriage bolt or machine bolt.
Both bolt fencing steel assemblies. The head design determines where you can place the wrench and how securely the bolt locks in place.
Common applications
Where it is used.
Tension band fastening in chain-link fence
Clamp tension bands and the tension bar to terminal posts so the edge of the mesh stays fixed.
Palisade pale attachment to rails
Secure vertical pales to horizontal angle rails in palisade systems with pale bolts and shear nuts.
Brace band and rail-end hardware
Fix brace bands and rail ends to posts, where the smooth head faces out and the square neck stops the bolt turning.
Questions answered
Common questions.
What else is a carriage bolt called?
In the US it's a carriage bolt. Spanish-speaking buyers call it a bullone testa tonda con quadro sottotesta.
What sizes are carriage bolts for chain-link fittings?
Carriage bolts for chain-link fencing typically run 5/16 or 3/8 inch diameter, the standard sizes for attaching tension bands and brace bands to terminal posts. Available in 1/4 to 1/2 inch (M6 to M12) diameters, 1-1/4 to 12 inches long, in Grade 2 or Grade 5 material, hot dip galvanized.
In chain-link, palisade and gate hardware
Carriage Bolt fixes the bands and fittings of the chain-link fence framework, the pales of palisade fencing, and gate hardware.
Explore fencing systems ↗Carriage Bolt specifications
Carriage Bolt configuration
ParameterUS / PrimaryMetric / Additional
Size1/4-1/2 in (5/16 and 3/8 in for fence fittings)M6-M12
Length1-1/4-12 in25-300 mm
HeadRound head, square neckMushroom head, square neck
ThreadUNC coarseMetric coarse
GradeGrade 2, Grade 5Class 4.6, 8.8
FinishHot Dip GalvanisedHot Dip Galvanised
Fencing Systems
Related components
Palisade Fence
Palisade Fence
Pale profile: D section or W section; triple pointed, single point, round top, notched round top or flat top · Pale thickness: 2.0, 2.5, 3.0 mm; up to 4.0 mm
Specifications
Fencing Components
Barbed Wire Arm
Size: 14 G x 1-5/8, 1-7/8, 2, 2-3/8, 2-1/2 in post / — · Type: 3-strand 45° arm, 3-strand vertical arm, 6-strand V arm
Specifications
Fencing Components
Tension Bar
Size: 3/16 x 5/8, 3/16 x 3/4, 1/4 x 3/4 in / 20 x 5, 25 x 5 mm · Length: For 3-12 ft fences; 2 in shorter than the fabric / 0.9-3.6 m; 50 mm shorter than the fabric
Specifications