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Allen Bolts

Allen Bolts, Allen Screws and Allen Sets all describe fasteners that are tightened or loosened with an Allen Key, 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.
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 high tensile steel class 12+ - 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) high tensile steel class 12 - a higher tensile non-stainless grade for screws and bolts, with a basic level of corrosion resistance.
MZP
Mechanically Plated Zinc Steel - mechanically plated to help prevent hydrogen embrittlement
Nylon
Nylon (polyamide) - a tough lightweight plastic, tough at low temperaures, with excellent resistance to chemicals and features a favourable sliding friction behaviour.

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