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Carriage Bolts

DIN 603 Carriage Bolts, Coach Bolts or Cup Square Bolts are listed below. Characterised by a flat mushroom or dome head, with a square section under the head to ensure the bolt does not rotate once fitted correctly. Available in A2 and A4 grade stainless steel, Bright Zinc Plated steel grades 4.6 and 8.8, and now in brass. Used primarily in wood constructions but not to be confused with Coach Screws, Carriage bolts are secured by the use of a nut and do not cut thread when tightening into position.
Fastener Material Key
A2 Stainless Steel - Also known as grade 304 or 18/8. A general purpose grade of stainless steel.
A4 Stainless Steel - Also known as grade 316 or 18/8/3. A higher corrosion resistant, marine grade of stainless steel.
Brass - Offers an attractive, corrosion resistant finish.
Bright Zinc Plated (BZP) Steel - Non-stainless standard steel grade offering a basic level of corrosion resistance.
Bright Zinc Plated (BZP) Class 8 High Tensile Steel - The general purpose high tensile grade for screws and bolts, with a basic level of corrosion resistance.