8.8 Zinc Plated Steel 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.

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Fastener Material Key
A2	A2 Stainless Steel - Also known as grade 304 or 18/8. A general purpose grade of stainless steel.
A4	A4 Stainless Steel - Also known as grade 316 or 18/8/3. A higher corrosion resistant, marine grade of stainless steel.
Brass	Brass - Offers an attractive, corrosion resistant finish.
BZP	Bright Zinc Plated (BZP) Steel - Non-stainless standard steel grade offering a basic level of corrosion resistance.
BZP-8.8	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.

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Coach Bolts DIN 603 in Bright Zinc Plated (BZP) Class 8 High Tensile Steel

Coach Bolts DIN 603 in Bright Zinc Plated (BZP) Class 8 High Tensile Steel

Generally used in timber to timber and timber to metal construction, these bolts incorporate a square neck to grip the hole in the timber when fitting, and therefore negates the need for any drive recess to be included on top of the head. Supplied to DIN 603. Please note that thread lengths stated are a minimum; In some cases a full thread will be supplied where a partial threaded shank is indicated in the specification. Nuts are supplied seperately, unlike the mild steel versions available elsewhere on the site.

BZP-8.8

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