FASTENERS - INSIGHTS

SS Fasteners benefits.

2026-09-27T00:57:56.218-07:00

2026-02-23T02:21:01.673-08:00

Magnetism in Stainless Steel

2026-02-20T03:04:00.000-08:00

2026-02-18T03:11:00.000-08:00

A4 fasteners are made from marine-grade stainless steel (typically AISI 316). They’re chosen when strength must be combined with excellent corrosion resistance.

Key Benefits

Superior corrosion resistance
- Excellent performance in saltwater, coastal, and marine environments
- Highly resistant to chlorides, acids, and industrial chemicals
Ideal for harsh conditions
- Suitable for outdoor, chemical, and high-humidity applications
- Performs well where A2 (304) fasteners may corrode
Good mechanical strength
- Common strength class: A4-70 (≈700 MPa tensile strength)
- Reliable for structural and load-bearing assemblies
High temperature resistance
- Maintains properties at elevated temperatures better than carbon steel
Low maintenance & long service life
- No need for protective coatings or frequent replacement
- Reduces lifecycle cost despite higher initial price
Non-magnetic (generally)
- Useful in electrical, electronic, and sensitive equipment installations
Clean & aesthetic finish
- Preferred in food processing, pharmaceutical, and architectural uses

Typical Applications

Marine & offshore equipment
Chemical plants and refineries
Coastal buildings and infrastructure
Food & dairy processing machinery
Medical and pharmaceutical equipment

A4-80

2026-02-18T03:08:00.000-08:00

Acceptable PPM Levels

2022-12-23T01:08:00.000-08:00

If a customer assembles 20 000 screws per day
and the batch has a PPM value of 500 it means that there
is 10 defect parts in the batch. This causes 10 stops in
the automatic assemblage. If each stop takes 5 minutes
to correct it will take 50 minutes each day to rectify. The
cost will be enormous.

Marking on SS screws.

2012-01-29T22:29:00.000-08:00

Hexagon and Hex Socket Screws from nominal diameter M5 must be marked.The marking must show the steel group, the property class and the manufacturer's mark.

SS-A2

2011-09-30T01:58:00.001-07:00

Stainless Steel of Type A2 is most frequently used. They are, however, unsuitable for use in non-oxidizing acids and media containing chlorides (like swimming pools, salt water etc.)

A2-70

2011-09-26T10:29:00.000-07:00

'70' in A2-70 stainless steel stands for 700N/mm2 tensile strength.

Electroplating Risks

2011-08-17T20:45:00.000-07:00

Fasteners above 8.8 grade should never be electro-plated due to the high risk of Hydrogen Embrittlement.

Split Lock Washers

2011-08-15T23:54:00.000-07:00

Split lock washers DIN127B are useless for property class 8.8 and above. If you are using it there is no benefit to the design.

Stainless Steel Fasteners

2010-03-04T21:52:00.001-08:00

Switch to Stainless Steel fasteners where ever possible. Specially for sizes below M6. This will solve all the problems related to corrosion and plating.

Fasteners Awareness

2009-10-22T01:59:00.000-07:00

Try to reduce the number of fastener types in new designs.
Use standard fasteners only, as far as possible.