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Socket Screws

Socket screws or socket bolts are fasteners that are tightened or loosened with an Allen Key or socket, also widely referred to as a Hex (Hexagonal) Socket Key. The Allen Key is inserted into a Hexagonal Socket within the screw or bolt. Allen Bolts or Screws come with various head styles including Cap Heads, Button Heads and Countersunk Heads, each prefixed commonly with the word Socket or Allen. Allen Sets or Grub Screws tend to refer to screws without a head, where the Allen key socket is integrated with the screw thread.
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
Black Oxide Class 12+ High Tensile Steel - A high tensile non-stainless grade with a black oxide finish offering limited corrosion resistance.
BO-10.9
Black Oxide High Tensile Steel Class 10.9 - A high tensile non-stainless grade with a black oxide finish offering limited corrosion resistance.
BZP
Bright Zinc Plated (BZP) Steel - Non-stainless standard steel grade offering a basic level of corrosion resistance.
BZP-10.9
Bright Zinc Plated (BZP) Class 10 High Tensile Steel - A high strength non-stainless grade for screws and bolts, with a basic level of 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.
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.
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.
MZP
Mechanically Plated Zinc Steel - Mechanically applied zinc plating, useful to help prevent hydrogen embrittlement.
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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