The main difference between Carriage Bolt 304 Stainless Steel and Square Neck Carriage Bolts lies in their design and functionality.

Carriage Bolt 304 Stainless Steel: This type of carriage bolt is made from 304 stainless steel, which is a highly corrosion-resistant and durable material. The carriage bolt has a domed head with a square shoulder underneath, which prevents it from turning when tightening the nut. It is typically used in applications where aesthetics and resistance to rust or corrosion are important, such as outdoor furniture, marine equipment, or areas with high moisture content.

Square Neck Carriage Bolts: Square neck carriage bolts are also known as coach bolts or round head square neck bolts. They have a square neck section directly beneath the head, which is designed to fit into a square hole or slot in the material being fastened. This square neck prevents the bolt from rotating during installation, making it easier to tighten the nut. Square neck carriage bolts are commonly used in woodworking and construction projects, where a secure and stable connection is required.

While both types of bolts have a similar purpose of fastening materials together, the Carriage Bolt 304 Stainless Steel is preferred for its corrosion resistance and aesthetic appeal, while Square Neck Carriage Bolts are chosen for their stability and ease of installation in woodworking and construction applications.