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Square Neck Carriage Bolts Wholesale

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Square Neck Carriage Bolts Manufacturers

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Introduction

Square Neck Carriage Bolts (often called coach bolts) are distinguished by their smooth, dome-shaped head and a small square section immediately beneath the head. This square neck is designed to be pulled into the material (typically wood or soft metal) upon tightening the nut, preventing the bolt from rotating. This feature allows for single-wrench installation, making them indispensable for security, woodworking, and decorative applications where the final appearance requires a smooth, round head free of driver slots.

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Specification

Head Style

Round Dome Head
Locking Method

Square Neck (Anti-Rotation)
Standard

ASME B18.5, DIN 603
Material Options

Low Carbon Steel, Stainless Steel (304), Brass
Key Advantage

Single Wrench Installation, Smooth Finish

Applications

  • Wood Construction: Decking, fencing, playground equipment, and wooden furniture assembly.

  • Security Fastening: Used on external hardware (like door hinges) where the smooth head prevents unbolting from the outside.

  • Vehicle Bodywork: Used in trailer beds and utility vehicle assembly.

  • Architectural Metalwork: For visually appealing, smooth finished connections.

Advantages

  • Anti-Theft/Tamper: The smooth, round head provides no external driving point for removal.

  • Aesthetic Finish: Ideal for visible connections where a smooth, dome-shaped head is preferred.

  • One-Hand Installation: Once the square neck is seated, only a single wrench is needed on the nut side.

  • Reduced Damage: Less likely to splinter wood compared to a standard hex bolt head upon seating.

Payment & Shipping

We offer mixed shipments of various diameters and lengths. Payment via TT or DA (Documents Against Acceptance) is available. Carriage bolts are bulk packaged in sacks or crates, with galvanizing and stainless steel options clearly segregated.

FAQ

  • Q: Do I need to drill a square hole for the neck?
  • A: No. You only drill a round hole slightly larger than the bolt shank. The square neck is designed to be drawn into the softer material (wood or thin metal) by the tightening of the nut, broaching its own square recess to lock the bolt.
  • Q: Is there a risk of the bolt stripping out of the wood?
  • A: In soft wood, there is a risk of the square neck stripping if overtightened. It is crucial to use a washer under the nut and stop tightening as soon as the nut is snug and the square neck is fully seated to avoid crushing the wood fibers.

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Steady-Ind

Steady-Ind - Pursue quality and cast high-quality goods.

STEADY manufactures over a thousands different types of blind rivet nut in steel,aluminium and stainless steel,thread size from M3-M16 in metric and UNC #6-32 to UNC 1/2-13 in inch. High advantage in stainless steel blind rivets both for open and sealed type, mutigrip,monobolt and other structural rivets. As China Square Neck Carriage Bolts Manufacturers and Square Neck Carriage Bolts Factory, we focus on "one stop shopping" and with advantage of large production capacity , consistent quality, competitive prices, punctual delivery and goods serverices before and after sales, STEADY has become one of the leading blind fasteners manufacuture & supplier in Asia.

About Us Steady-Ind
Recommended LINS: Square Head Set Screws High Tensile Structural Bolts 10.9 Full Thread Grade 8.8 Hex Bolts Stainless Steel 316 U-Bolts