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Stainless Steel Bolts Supplier in Kolkata
Stainless steel fasteners are used where corrosion resistance, clean appearance or hygiene matters. Selection should be based on the service environment as well as the required mechanical properties; stainless steel is not automatically suitable for every chemical, marine or structural application.
Stainless steel bolt grades and corrosion notes
Stainless steel bolts are selected for corrosion resistance, clean appearance, and hygiene-sensitive areas. The most common buying distinction is between SS 304 and SS 316, with A2-70 and A4-80 terminology often used for metric stainless fasteners.
| Common supply | SS hex bolts, socket screws, machine screws, nuts, plain washers, spring washers, and threaded fasteners |
|---|---|
| Grades handled | SS 202, SS 304, SS 316, A2-70, A4-70, and A4-80 as per requirement |
| Reference standards | DIN 933, DIN 931, DIN 934, ISO 3506, ASTM stainless material references where required |
| Finishes | Natural stainless, passivated, polished, and application-specific finishes |
| Use cases | Chemical plants, food equipment, marine-adjacent areas, water treatment, outdoor fabrication, and architectural fittings |
Procurement checks before ordering
- Use SS 316 or A4 grades for more corrosive or marine-adjacent conditions; SS 304 is not the answer for every environment.
- Avoid carbon steel contamination during storage and installation of stainless fasteners.
- Use anti-seize where galling risk is high, especially in stainless nut-bolt assemblies.
- Confirm whether magnetic response is acceptable; some stainless grades may show slight magnetism after cold working.
Frequently asked questions
Which is better, SS 304 or SS 316 bolts?
SS 316 offers better corrosion resistance in chloride and harsher environments, while SS 304 is commonly used for general stainless applications.
Do stainless bolts need matching stainless nuts?
For best corrosion performance, use compatible stainless nuts and washers instead of mixing with carbon steel hardware.
Can you supply A2 and A4 stainless fasteners?
A2 and A4 stainless fasteners can be supplied subject to size, grade, and stock availability.
Stainless Steel Nuts & Bolts
Stainless Steel Nuts & Bolts
Stainless Steel Bolts
