Steel Carriage Bolt

Stainless steel carriage bolts, also known as coach bolts or round head square neck bolts, are a type of fastener with unique features and wide applications2. Here is a brief introduction:

Structural Characteristics

Round Head + Square Neck: The bolt has a smooth, dome - shaped round head (without slots, so it can't be tightened with a screwdriver) and a square neck below the head4. The square neck is slightly larger than the threaded diameter and is used to prevent the bolt from rotating when installed4. It needs to be tightened with a nut from the other side to achieve a quick and stable connection6.

Full - Thread or Half - Thread Screw: The screw part is threaded. According to requirements, it can be designed as a full - thread (the entire screw has threads) or half - thread (the tail of the screw has no threads).

Galvanized carriage bolts are a type of fastener designed with a rounded head, a square neck beneath the head, and a threaded shaft, featuring a galvanized coating for enhanced corrosion resistance. Here is a detailed introduction:

Structural Features

Similar to standard carriage bolts, their key structural elements include:

A smooth, dome-shaped round head (no slots, so they cannot be tightened with screwdrivers) to avoid sharp edges and ensure safety in exposed applications.

A square neck directly below the head, which fits into a pre-drilled square hole in the connected material or is clamped by a wrench, preventing the bolt from rotating when the nut is tightened-critical for stable connections.

A fully or partially threaded shank, designed to mate with nuts for secure fastening of two or more components.

Iron carriage bolts are a type of traditional fastener crafted from carbon steel, characterized by their distinct structural design and versatility in general-purpose fastening scenarios. Here is a detailed introduction:

Structural Features

Iron carriage bolts retain the classic design of carriage bolts, with key structural elements that ensure reliable performance:

Round, smooth head: A dome-shaped head with no slots or recesses, which eliminates sharp edges and reduces the risk of snagging or injury in exposed applications.

Integral square neck: Directly beneath the head, a square neck (with side length slightly larger than the thread diameter) prevents the bolt from rotating when the nut is tightened. This neck either fits into a pre-drilled square hole in the material or is clamped by a wrench, ensuring stable installation.

Threaded shank: The cylindrical shaft below the square neck is fully or partially threaded, designed to mate with nuts for securing multiple components together.