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Home   /   12.9 Zinc Flaked Steel Cap Screws Metric

12.9 Zinc Flaked Steel Cap Screws Metric

Socket head cap screws have a cylindrical head shape, with an internal drive. Unlike hex head bolts, no external clearance is needed for installation, making them perfect for recessed or tight spaces. Used extensively on modern machinery, an allen / hex or torx key is required for installation.
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.
A4-80
A4-80 Stainless Steel - Identical corrosion resistance to A4-70 but with a higher tensile strength equivalent to that of 8.8 high tensile steel.
BO-12.9
Black Oxide High Tensile Steel Class 12.9 - A high tensile non-stainless grade with a black oxide finish offering limited corrosion resistance.
BZP-12.9
Bright Zinc Plated (BZP) Class 12 High Tensile Steel - A higher tensile non-stainless grade for screws and bolts, with a basic level of corrosion resistance.
Duplex
Duplex Stainless Steel 1.4462 - A type of stainless steel which has greater corrosion resistance than A4 / 316 and a high tensile strength of minimum 700 N/mm2. Also known as 318LN.
Nylon
Plastic (Nylon Polyamide) - A tough lightweight plastic, strong at low temperatures, with excellent resistance to chemicals, and features favourable sliding friction behaviour.
ZnFlk-12.9
Organic Zinc Flake Coated Class 12 High Tensile Steel - A higher tensile non-stainless grade for screws and bolts. Coated with superior mechanically applied zinc with corrosion resistance lasting 480 hours in the salt spray test.

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