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ISO 9001:2015 · ASTM A193/A194/A320 · Grades 304 to 904L

Stainless Steel Fasteners Manufacturer, Supplier & Exporter of Premium Industrial Fasteners

We manufacture a complete range of stainless steel fasteners in grades 304, 304L, 316, 316L, 310, 321, 347, 410, 420, 904L and 17-4 PH for food, marine, chemical, and high-temperature applications.
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10

Grades

60

Products

-196°C

Min Temp

1150°C

Max Temp

485 MPa

Min tensile strength · SS 316L per ASTM A193 B8M

Good–Excellent

Passive oxide film · grade-dependent chloride resistance

7.98 g/cm³

Density (avg) · austenitic Fe-Cr-Ni alloy

The corrosion-resistant workhorse explained

What is Stainless Steel Fasteners?

Stainless steel is an iron-chromium alloy family containing a minimum of 10.5% chromium, which forms a passive oxide layer providing corrosion resistance across a wide range of environments. The fastener grades — including 304, 316L, 310, 321 and 904L — span from general-purpose food-industry service through to high-temperature furnace and highly corrosive acid plant applications. Stainless steel fasteners are the industry standard for applications requiring moderate corrosion resistance combined with good mechanical properties at an economical cost. Grade 316L (UNS S31603) with 2–3% molybdenum is the most widely specified grade for marine, pharmaceutical and chemical service, while SS 310 (UNS S31000) with 24–26% chromium is preferred for high-temperature furnace and heat-treating applications above 870°C.
PropertySpecification
Base ElementIron (Fe)
Cr Content11–26%
Ni Content0–28%
Max Service Temperature1150°C (SS 310)
Density7.75–7.99 g/cm³
ASTM StandardsA193, A194, A276, A320

Stainless Steel grades — which do you need?

Multiple fastener grades and material grades exist for Stainless Steel Fasteners, each tailored to specific engineering applications and loads. Variations in mechanical properties, corrosion resistance, temperature capability, and strength influence material selection for industrial fasteners; comparing the available grades helps identify options aligned with operating environment, industry, and engineering requirements.

Grade UNS Cr % Key Property Max Temp Best Application
SS 316L UNS S31603 16–18% Mo + low carbon 800°C Marine, chemical View grade
SS 304 / 304L UNS S30400 18–20% General purpose 870°C Food processing View grade
SS 310 UNS S31000 24–26% Heat resistant 1150°C Industrial furnaces View grade
SS 321 UNS S32100 17–19% Ti stabilized 870°C Aerospace exhaust View grade
SS 347 UNS S34700 17–19% Nb stabilized 900°C High-temp plants View grade
SS 410 UNS S41000 11.5–13.5% High strength 650°C Valves, turbines View grade
SS 420 UNS S42000 12–14% Wear resistant 650°C Cutlery, tools View grade
SS 904L UNS N08904 19–23% Acid resistant 400°C Desalination View grade
SS 17-4 PH UNS S17400 15–17.5% Precipitation hardened 315°C Aerospace, shafts View grade
SS 2205 (Duplex) UNS S32205 21–23% Duplex strength 300°C Offshore, marine View grade
SS 17-4 PH
SS 2205 (Duplex)
SS 304 / 304L / 304H
SS 310 / 310S
SS 316 / 316L / 316Ti
SS 321
SS 347 / 347H
SS 410 / 416
SS 420
SS 904L

Stainless Steel Fasteners — International Standards & Material Certifications

Stainless Steel Fasteners from RealBolt Engineering Industries are manufactured to ASME SA-193 B8/B8M, SA-194 Grade 8/8M, SA-320 B8M, and ISO 3506-1/3506-2. All batches ship with EN 10204 MTC 3.1; third-party 3.2 certification, NACE MR0175, and PMI (XRF) testing are available on request for all stainless steel grades.
Standards
DIN 931 DIN 933 DIN 960 DIN 961 DIN 912 DIN 6912 DIN 7984 DIN 7985 DIN 7991 DIN 965 DIN 938 DIN 939 DIN 976-1 DIN 934 DIN 939 DIN 980 DIN 982 DIN 985 DIN 439 DIN 315 DIN 1587 DIN 125A DIN 126 DIN 127 DIN 128 ISO 4014 ISO 4017 ISO 8676 ISO 8765 ISO 4762 ISO 10642 ISO 14579 ISO 4032 ISO 4161 ISO 7040 ISO 7089 ISO 7090 ISO 7092 ISO 7093 ASME B18.2.1 ASME B18.3 ASME B18.6.3 ASME B18.31.2 ASME B18.2.2 ASME B18.21.1 EN ISO 4014 EN ISO 4017 EN ISO 4762 EN ISO 4032 EN ISO 7089 BS EN ISO 4014 BS EN ISO 4017 BS EN ISO 4032 BS 1768 BS 3692 BS 4190 BS 4320 IS 1363 IS 1364 IS 1367 IS 12427 UNI 5737 UNI 5739 UNI 5588 UNI 6592 UNI 6593 CSN 021101 CSN 021103 CSN 021123 PN 82101 PN 82105 PN 82144
Certifications
ISO 9001:2015 NACE MR0175 NABL Lab PED 2014/68/EU MTC 3.1 / 3.2

Stainless Steel Fasteners Applications — Industries & Use Cases

Stainless Steel Fasteners from RealBolt Engineering Industries are specified by engineers and procurement teams across demanding industries where passive oxide film corrosion protection across food, pharmaceutical, marine, and high-temperature service is critical to fastener performance and service life. Primary end-use sectors for Stainless Steel Fasteners include food and dairy processing, pharmaceutical and biotech, marine and offshore, chemical processing, oil and gas, and power generation — click each industry below to see specific application details and recommended grades.
SS 304 and 316L fasteners are standard in food processing equipment, dairy vessels, brewery tanks and pharmaceutical reactors where cleanliness, passivation and CIP/SIP resistance are required. Surface finish Ra ≤ 0.8 µm available.
SS 316L (Mo 2–3%) is specified for marine deck fittings, boat hardware and coastal infrastructure. For higher chloride resistance, 904L (Mo 4–5%) is preferred in desalination plants and offshore modules.
SS 317L (Mo 3–4%) and 904L serve dilute acid environments where 316L is borderline. SS 316Ti and 347 resist sensitization in high-temperature welded assemblies. SS 310 is preferred in oxidizing high-temperature atmospheres to 1150°C.
ASTM A193 B8M (316L) stud bolts are standard for process flanges. A320 L7M serves cryogenic service to -196°C. SS 410 (A193 B6) provides higher strength for steam turbine and valve bolting.
SS 310 and 321 fasteners are used in radiant tube supports, furnace internals, steam reformers and heat-treating equipment where scaling resistance above 870°C is required.

Stainless Steel vs Duplex Steel vs Carbon Steel

This comparison table supports engineers and procurement managers in selecting between Stainless Steel, Duplex Steel, and Carbon Steel Fasteners based on chloride stress corrosion cracking resistance, maximum service temperature, minimum tensile strength, NACE MR0175 sour gas compliance, and relative material cost — from general-purpose Grade 304 through to offshore-qualified Duplex 2205. Use this data to make an informed alloy selection for your specific operating environment, design code, and budget — or contact RealBolt’s technical team for a project-specific recommendation.
Property SS 316L Duplex 2205 Carbon Steel 8.8
Max service temp 800°C 300°C 200°C
Chloride SCC resistance Moderate Excellent N/A
Tensile strength (min) 485 MPa 620 MPa 800 MPa
Density 7.98 g/cm3 7.82 g/cm3 7.85 g/cm3
Relative cost Medium Medium-High Lowest
NACE MR0175 compliant Conditional Yes No

Verdict: SS 316L is the standard for moderate corrosion resistance. Duplex 2205 is chosen for chloride-heavy or offshore environments. Carbon Steel 8.8 is the economical choice for dry indoor applications with applied protection.

Need Stainless Steel fasteners? Get a competitive price today.

Partner with RealBolt Engineering Industries for certified Stainless Steel Fasteners backed by full EN 10204 material test reports, competitive pricing, and reliable global delivery from our Mumbai facility. Our technical team supports grade selection across SS 304, 316L, 310, 321, 347, 904L, and 17-4 PH and supplies ASTM A193 B8M stud bolts with A194 8M nuts, cryogenic A320 B8M fasteners, and custom-machined specials in sizes M6–M100 with full EN 10204 3.1/3.2 MTR documentation. Request a quote today and receive a competitive price within 24 hours.
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Stainless Steel Fasteners — Common Questions Answered by Our Technical Team

Browse the expert answers below to the most frequently asked questions about Stainless Steel Fasteners — covering SS 304 vs 316L selection, chloride corrosion guidance, ASTM A193 B8M and B8 standards, sensitization in 321 vs 347 grades, maximum operating temperatures, galvanic compatibility, and documentation including NACE MR0175 and EN 10204 3.1/3.2 certifications. If your question is not answered here, contact the RealBolt technical team directly for grade-specific guidance, project support, and competitive pricing on Stainless Steel Fasteners.
SS 304 (UNS S30400) is the standard austenitic grade for general corrosion resistance. SS 316L (UNS S31603) adds 2–3% molybdenum and lower carbon, providing significantly better chloride and pitting corrosion resistance. Choose 316L for marine, chemical and pharmaceutical environments; 304 for dry, indoor or mild corrosion conditions.
SS 316L has limited seawater resistance — it can pit in stagnant seawater above 25°C. For continuous seawater immersion, we recommend Duplex 2205, Super Duplex 2507, Cupro Nickel 70/30 or Titanium Grade 2. For splash zone and intermittent seawater, SS 316L with regular maintenance is acceptable.
SS 316L retains tensile properties to approximately 800°C but is susceptible to sensitization (intergranular corrosion) between 425–860°C in the presence of corrosives. For continuous high-temperature service, use SS 321 (Ti-stabilised), SS 347 (Nb-stabilised) or SS 310 above 870°C.
Yes. We supply ASTM A193 Grade B8M stud bolts paired with ASTM A194 Grade 8M heavy hex nuts — the standard combination for process flanges in stainless steel service. Available in continuous thread, double-end and tap-end stud bolt configurations.

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