Number... Glossary of Fastener and Fixing Terminology

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12 POINT BOLTS AND NUTS

Bolt or screw whose cross section of its head is in the shape of a 12 pointed star, also called 12 point bolts. Product

18/8 STAINLESS STEEL FASTENERS

18.8 is specified for British Inch it is equivalent to Stainless steel A2 is specified for metric fasteners, American Inch fasteners use the equivalent 304 stainless material specification. It contains 18% Chromium and 8% nickel and is an austenitic steel and is non-magnetic. The chromium provides a corrosion and oxidation resistance, however it can tarnish. 

18/10 STAINLESS STEEL FASTENERS

Contains 18% Chromium and 10% nickel and is an austenitic steel. The chromium provides a corrosion and oxidation resistance, however it can tarnish. 

304 STAINLESS STEEL FASTENERS

Stainless steel A2 is specified for metric fasteners, American Inch fasteners use the equivalent 304 stainless material specification and 18.8 for British Inch.  It contains 18% Chromium and 8% nickel and is an austenitic steel and is non-magnetic. The chromium provides a corrosion and oxidation resistance, however it can tarnish. 

316 STAINLESS STEEL FASTENERS

Stainless steel material A4 is also called type 316 and is required for marine conditions where you need more resistance to corrosion. Adding molybdenum (2-3%) to the mix provides this extra resistance.

316 is austenitic, non-magnetic, the molybdenum increases the corrosion resistance to withstand attack from many industrial chemicals and solvents and chlorides.

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