Stainless Steel Fasteners

Stainless steel fastener products are available in a wide range with grades A2 and A4 being the most popular. Higher tensile grades of A2-70 and A4-80 stainless steel have become the norm.

The Stainless steel fastener range includes Metric Coarse, Metric Fine, UNC, UNF, BSW, BSF and BA.  

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Class  A2    USA Grade  304

Grade A2 is an Austenitic grade of stainless steel, it has excellent resistance to atmospheric corrosion except in severe marine and industrial environments.

Oxidation resistance is satisfactory for use up to 850ºC. Resistance to nitric acid and other oxidising chemicals is excellent.

Resistance to other mineral and organic acids is good within limits of temperature and concentration. Generally unsuitable for solutions of hydrochloric acid and chlorides, particularly if evaporation at high temperatures occurs. 

This grade can be described as non-magnetic except when heavily cold worked. It is not hardenable by heat treatment, but is greatly strengthened by cold working. High strength and toughness at sub-zero temperatures down to minus 250ºC.

Significant stress relaxation above 575ºC. 

Applications

Civil and chemical engineering food processing, medical and brewing equipment and many types of domestic appliances, Cryogenic equipment, special purpose building and masonry fixings. 

 

Class  A4    USA Grade  316

Grade A4 is also an Austentic grade of stainless steel, it has a higher corrosion resistance than A2 grade in many chemical environments, including contact with dilute sulphuric acid, and acetic acid over a wide range of temperature and concentration. Resistance to atmospheric staining and pitting in industrial and urban areas, and also is suitable for marine conditions but not immersed in sea water.

Oxidation resistance is satisfactory for use up to 800ºC. Resistance to nitric acid and other oxidising chemicals is excellent. Resistance to other mineral and organic acids is good within certain limits of temperature and concentration. Generally unsuitable for solutions of hydrochloric acid and chlorides, particularly if evaporation at high temperatures occurs. Satisfactory oxidation resistance up to 800ºC.

Significant stress relaxation above 600ºC. 

Applications

Fasteners for boat deck fittings, chemical plant, swimming pools, dye vats, fertiliser, rayon and sewage treatment plants. Dairy equipment. Medical sterilising equipment. 

 

 

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