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Socket Cap Screws

Also known as an Allen screw or Allen bolt, or simply a cap screw. Socket Head Cap screws are a more modern alternative standard machine fastener to the standard hexagon headed bolt or setscrew, as found on much modern machinery. A hex key (otherwise known as an Allen key) is required to fit these fasteners.
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.
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.
Black oxide high tensile steel class 12+ - a high tensile non-stainless grade with a black oxide finish offering limited corrosion resistance
Bright Zinc Plated (BZP) Steel - non-stainless standard steel grade offering a basic level of corrosion resistance.
Bright Zinc Plated (BZP) high tensile steel class 12 - a higher tensile non-stainless grade for screws and bolts, with a basic level of corrosion resistance.
Nylon (polyamide) - a tough lightweight plastic, tough at low temperaures, with excellent resistance to chemicals and features a favourable sliding friction behaviour.