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SS 321 Threaded Rods Manufacturer & Exporter in India

Explore SS 321 Threaded Rods Manufacturer & Exporter in India manufactured for demanding industrial applications with reliable strength, corrosion resistance and compliance with international standards.
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-196

Min Temp

870

Max Temp

🌡

870

Suitable for continuous service up to approximately 870°C under typical operating conditions.

⚡

620

Typical tensile strength around 620 MPa depending on product form and heat treatment.

🛡

Very Good

Very Good corrosion resistance in a wide range of industrial environments.

⚖

8

Typical density is approximately 8.0 g/cm³.

Product Overview

What are SS 321 Threaded Rods?

SS 321 threaded rods are high-temperature, titanium-stabilized austenitic stainless steel fasteners manufactured from UNS S32100 bar stock conforming to ASTM A479 or ASTM A193 Grade B8T. The addition of titanium (Ti) prevents intergranular corrosion during welding and high-temperature service, making SS 321 threaded rods ideal for bolted joints exposed to temperatures up to 870°C (1600°F).

These rods are widely specified for use in exhaust manifolds, heat exchangers, furnace equipment, and chemical process piping where resistance to scaling, oxidation, and carbide precipitation is critical. SS 321 threaded rods are available in metric and inch sizes, fully threaded along their length, and supplied with EN 10204 3.1 certification for full traceability.

Quick Specifications

MaterialStainless Steel 321
UNS NumberS32100
DIN Number1.4541
Material StandardASTM A479 / ASTM A193 B8T
Rod Standard (Metric)DIN 975 / DIN 976
Rod Standard (Inch)ASME B18.31.3
Thread FormISO Metric / UNC / UNF
Diameter RangeM6-M64 / ¼"-2½"
Tensile Strength515 MPa (75 ksi) min
Yield Strength205 MPa (30 ksi) min
HardnessMax 223 HB / 95 HRB
? All material certified by NABL-accredited laboratory. PMI and IGC test available on request.

Complete the Fastener Set

Other SS 321 Fastener Products Available from RealBolt

RealBolt also manufactures the complete SS 321 fastener range from certified stainless steel bar stock, including SS 321 Bolts, SS 321 Nuts, SS 321 Screws, SS 321 Washers, and SS 321 Studs. All SS 321 fastener types are produced to ASTM with full EN 10204 MTC 3.1/3.2 documentation.
SS 321 Bolts
SS 321 Nuts
SS 321 Screws
SS 321 Washers
SS 321 Studs

Technical Data

SS 321 Threaded Rods Dimensions, Sizes & Thread Standards

SS 321 Threaded Rods are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 975 (fully threaded) / DIN 976 (studs) / ASME B18.31.3. Custom cut lengths available in 10mm increments. Inch sizes per ASTM F593 and ASME B18.31.3.

Threaded Rod Dimensions - Metric (DIN 975)

Size (M)Pitch (mm)Rod Length (mm)Thread Type
M61.01000 / 2000Full
M81.251000 / 2000Full
M101.51000 / 2000Full
M121.751000 / 2000Full
M162.01000 / 2000Full
M202.51000 / 2000Full
M243.01000 / 2000Full
M303.51000 / 2000Full
M364.01000 / 2000Full
M424.51000 / 2000Full
M485.01000 / 2000Full
M565.51000 / 2000Full
M646.01000 / 2000Full

Dimensional & Material Standards

StandardCoversThread
DIN 975Threaded rods, full threadMetric
DIN 976Stud bolts, cut lengthsMetric
ASME B18.31.3Threaded rods, inch/metricUNC/UNF/Metric
ASTM F593Stainless steel rodsUNC/UNF
Material StandardRequirement
ASTM A479Bar/rod - UNS S32100
ASTM A193 B8THigh-temp fasteners
EN 10088-3Stainless steel rod
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

SS 321 Chemical Composition

SS 321 Threaded Rods are manufactured from an iron-chromium-nickel alloy with chromium (16–26%), nickel (8–28%), and grade-specific molybdenum additions per ASTM and ASTM A193/A194. Chromium content governs the self-healing passive oxide film; molybdenum (2–6%) enhances chloride pitting resistance; and carbon content determines sensitization risk in welded assemblies.

Chemical Composition per ASTM A479 / A193 B8T

ElementComposition (%)
Chromium (Cr)17.0-19.0
Nickel (Ni)9.0-12.0
Titanium (Ti)5xC min, 0.70 max
Carbon (C)0.08 max
Manganese (Mn)2.00 max
Silicon (Si)1.00 max
Phosphorus (P)0.045 max
Sulfur (S)0.030 max
Iron (Fe)Balance
? All heats verified by NABL-accredited spectrometry. IGC and PMI available on request.

Why SS 321 Alloy Composition Matters for Threaded Rods

Titanium Stabilization
Titanium binds carbon, preventing chromium carbide precipitation at grain boundaries. This ensures SS 321 threaded rods resist intergranular corrosion after welding or high-temperature exposure, unlike SS 304 or 316.
High-Temperature Strength
The austenitic structure and Ti addition allow SS 321 rods to maintain mechanical properties and oxidation resistance up to 870°C, making them ideal for exhaust, furnace, and heat exchanger bolting.
Weldability
SS 321 rods can be welded without risk of sensitization, eliminating the need for post-weld heat treatment in most applications.

Fastener Performance

SS 321 Threaded Rods Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for SS 321 Threaded Rods per ASTM. SS 321 threaded rods achieve 620 MPa tensile strength, with hardness, yield, and elongation values verified by NABL-accredited testing and reported in the EN 10204 MTC.

Rod SizeDry (Nm)Lubricated (Nm)Clamp Load (kN)
M12705625
M1617013650
M2034027280
M24590472120
M301200960190
M3621001680275
M4233002640370
M4848003840480
?? Anti-galling: Use molybdenum-based or PTFE anti-seize. Lubricated values assume K=0.16. Avoid over-torquing to prevent thread galling in austenitic stainless steel.

Industry Applications

SS 321 Threaded Rods Applications — Industries & End Uses

SS 321 Threaded Rods from RealBolt are specified across food and dairy, pharmaceutical, marine, chemical processing, and oil and gas where very good corrosion resistance and 620 MPa tensile strength are required for reliable fastener performance. Click each industry below for detailed application examples.
SS 321 threaded rods are widely used for bolting in refinery heaters, reformers, and process piping where high-temperature resistance and immunity to intergranular corrosion are required. ASTM A193 B8T is the standard for heater and exchanger bolting.
Threaded rods for exhaust manifolds, ductwork, and furnace assemblies in power plants and industrial heating systems. SS 321 maintains strength and resists scaling at elevated temperatures, outperforming SS 304 in thermal cycling.
Used for bolted connections in acid and alkali process lines, reactors, and pressure vessels where resistance to organic acids and oxidizing environments is needed. SS 321 rods are preferred over SS 304/316 for nitric acid service.
SS 321 threaded rods are specified for aircraft engine mounts, exhaust clamps, and structural assemblies exposed to vibration and high heat. AMS 5645 and ASTM A479 standards apply.

SS 321 Threaded Rods Standards & International Certifications

SS 321 Threaded Rods from RealBolt Engineering Industries are manufactured to internationally recognised fastener dimensional standards covering thread form, tolerances, strength grades, and quality requirements. Every batch ships with EN 10204 MTC 3.1/3.2, IS 12427 compliance, ISO 3506 material certification, NACE MR0175, and PMI (XRF) reports — available on request for all orders.
Standards
DIN 975 DIN 976-1 ASME B18.31.2 IS 1367 IS 1364 IS 12427
Certifications
ISO 9001:2015PED 2014/68/EUNABL LabEN 10204 3.1 / 3.2

Buy SS 321 Threaded Rods from India's Leading Manufacturer — Get a Competitive Quote Today

Partner with RealBolt — India’s leading manufacturer of certified SS 321 Threaded Rods — for competitive pricing, EN 10204 MTC 3.1/3.2 documentation, and fast Mumbai dispatch. Standard sizes are ex-stock; custom dimensions accepted with 2–3 week lead time. Request your quote today.
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Answers for Buyers

SS 321 Threaded Rods — Frequently Asked Questions

Browse expert answers to common questions about SS 321 Threaded Rods from RealBolt — covering ASTM A193/A194 grades, chloride resistance, temperature limits, sensitization, sizes, and MTC documentation. Contact our technical team directly for project-specific guidance on SS 321 threaded rods selection and pricing.
SS 321 threaded rods are manufactured to DIN 975 (metric full thread), DIN 976 (studs), ASME B18.31.3 (inch and metric), and ASTM F593 (inch). Material is supplied per ASTM A479 or ASTM A193 B8T for high-temperature service. Custom thread forms (UNC, UNF, BSW, BSF) and cut lengths are available on request.
Use a molybdenum-based or PTFE anti-seize compound (such as Molykote 1000 or Loctite LB 8014) on threads and nut faces to prevent galling. Avoid copper-based anti-seize in chloride or high-temperature environments. Reduce torque by 20% when lubricated.
Yes – SS 321 threaded rods are stabilized with titanium, allowing continuous service up to 870°C (1600°F) without risk of intergranular corrosion or loss of mechanical strength. They are the preferred choice for furnace, exhaust, and heater bolting over SS 304/316.
No MOQ for standard sizes (M8-M30) in stock – single rods can be supplied for urgent needs. Custom diameters or cut lengths have a minimum order of 10 kg. Price breaks are available at 25, 100, and 500 rods.

Industrial Cities We Serve:

  • Ahmedabad
  • Aurangabad
  • Bengaluru
  • Chennai
  • Coimbatore
  • Faridabad
  • Gandhidham
  • Greater Noida
  • Gurugram
  • Hazira
  • Hosur
  • Hyderabad
  • Jamnagar
  • Jamshedpur
  • Ludhiana
  • Mumbai
  • Mundra
  • Mysuru
  • Nagpur
  • Nashik
  • Navi Mumbai
  • Noida
  • Pune
  • Rajkot
  • Sanand
  • Surat
  • Thane
  • Tiruppur
  • Vadodara
  • Visakhapatnam

Countries We Export To:

  • US
  • Canada
  • Mexico
  • Germany
  • UK
  • France
  • Italy
  • Spain
  • Netherlands
  • Belgium
  • Poland
  • Sweden
  • Norway
  • Denmark
  • Turkey
  • UAE
  • Saudi Arabia
  • Qatar
  • Oman
  • Kuwait
  • Bahrain
  • South Africa
  • Egypt
  • Nigeria
  • Australia
  • New Zealand
  • Singapore
  • Malaysia
  • Indonesia
  • Thailand
  • Vietnam
  • South Korea
  • Japan
  • Brazil