DIN608 CARRIAGE BOLTS

Our Carriage Bolts are designed for fastening applications where secure installation, anti-rotation performance, and a clean finished appearance are equally important. Featuring a smooth, rounded head and a square neck beneath the head, the bolt is designed to resist rotation during tightening when properly seated in the mating material, helping simplify installation while providing a neat exposed surface. This makes carriage bolts, also commonly known as coach bolts or round head square neck bolts, a practical choice for woodworking, furniture, fencing, decking, brackets, metal fabrication, agricultural equipment, machinery, and various construction and maintenance applications.

1035 and 1045 Steel for Different Applications

Our Carriage Bolts are manufactured from 1035 and 1045 carbon steel, providing buyers with practical material options for different fastening requirements. 1035 carbon steel is well suited to general-purpose fastening where a balance of strength, manufacturability, and cost efficiency is required, while 1045 carbon steel provides a higher-strength option for applications requiring improved mechanical performance.

Available metric property classes include 4.8, 6.8, 8.8, and 10.9 according to ISO 898-1, while inch-series products are available in SAE J429 Grade 2, Grade 5, and Grade 8. This broad grade selection allows buyers to specify the appropriate mechanical performance for everything from general-purpose assemblies to more demanding structural and mechanical applications.

Smooth Round Head and Square Neck Design

The defining feature of a Carriage Bolt is its smooth domed head and square neck. Unlike conventional hex head bolts, the rounded head provides a low-profile, finished appearance while the square neck helps prevent the bolt from turning when the nut is tightened from the opposite side.

This design can be particularly useful where access to the bolt head is limited or where a protruding hexagonal head is undesirable. It also creates a cleaner appearance for visible fastening points, making Carriage Bolts popular in wood-to-wood, wood-to-metal, and metal-to-metal assemblies. For manufacturers and contractors, this combination of functional anti-rotation performance and clean appearance makes Carriage Bolts a versatile fastening component rather than simply an alternative bolt head style.

DIN and ASME Standard Options

Our Carriage Bolts are available according to internationally recognized specifications, including DIN 603, DIN 608, and ASME B18.5, supporting both metric and inch-series fastening requirements. These standards provide recognized dimensional references for carriage bolt products and help customers select compatible components for their existing assemblies and production systems.

The available size range covers M5 to M20 for metric applications and approximately #10 to 3/4" for inch-series applications. This allows the product range to cover small hardware and furniture applications as well as larger fastening requirements in construction, equipment, fencing, and structural assemblies.

Black, Zinc-Plated and Hot-Dip Galvanized Finishes

Different applications require different levels of surface protection, so our Carriage Bolts are available in Black, Zinc Plated (ZP), and Hot-Dip Galvanized (HDG) finishes.

A Flexible Sourcing Solution for OEM and Wholesale Buyers

With 1035 and 1045 carbon steel, multiple ISO and SAE strength grades, DIN and ASME standards, metric and inch sizes, and three surface finish options, our Carriage Bolts provide a flexible sourcing solution for manufacturers, hardware distributors, construction suppliers, importers, and wholesalers.