+912267437972

+919022636025

enquiry@real-bolt.com

Contact Us

SS 347 / 347H Threaded Rods Manufacturer & Exporter in India

Explore SS 347 / 347H Threaded Rods Manufacturer & Exporter in India manufactured for demanding industrial applications with reliable strength, corrosion resistance and compliance with international standards.
Request a Quote
View Products

-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 347 / 347H Threaded Rods?

SS 347 / 347H threaded rods are high-temperature, stabilized austenitic stainless steel fasteners manufactured from UNS S34700/S34709 bar stock conforming to ASTM A193 and ASTM A276. Alloyed with columbium (niobium), these rods resist intergranular corrosion and maintain mechanical strength at elevated temperatures, making them ideal for high-stress, high-temperature bolted connections.

347H is the high-carbon version, offering improved creep resistance above 550°C. Both grades are widely specified for threaded rod applications in refinery, petrochemical, and power generation sectors where standard 304/316 stainless steel would fail due to carbide precipitation or thermal fatigue.

Quick Specifications

MaterialStainless Steel 347 / 347H
UNS NumberS34700 / S34709
DIN Number1.4550 / 1.4961
Material StandardASTM A193 / ASTM A276
Threaded Rod StandardDIN 975 / DIN 976 / ISO 898-1
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 reports available on request.

Complete the Fastener Set

Other SS 347 / 347H Fastener Products Available from RealBolt

RealBolt also manufactures the complete SS 347 / 347H fastener range — SS 347 / 347H Bolts, SS 347 / 347H Nuts, SS 347 / 347H Screws, SS 347 / 347H Washers, SS 347 / 347H Studs — from certified bar stock per ASTM with full EN 10204 MTC 3.1/3.2 documentation and fast Mumbai dispatch.
SS 347 / 347H Bolts
SS 347 / 347H Nuts
SS 347 / 347H Screws
SS 347 / 347H Washers
SS 347 / 347H Studs

Technical Data

SS 347 / 347H Threaded Rods Dimensions, Sizes & Thread Standards

SS 347 / 347H Threaded Rods are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 975 (full thread) / DIN 976 (studs) / ISO 898-1. Custom lengths up to 3 meters. Inch sizes available per ASTM A193 and ASME B18.31.3.

Threaded Rod Dimensions - Metric (DIN 975)

Size (M)Pitch (mm)Rod Length (mm)Thread Type
M61.01000 / 2000 / 3000Full
M81.251000 / 2000 / 3000Full
M101.51000 / 2000 / 3000Full
M121.751000 / 2000 / 3000Full
M162.01000 / 2000 / 3000Full
M202.51000 / 2000 / 3000Full
M243.01000 / 2000 / 3000Full
M303.51000 / 2000 / 3000Full
M364.01000 / 2000 / 3000Full
M424.51000 / 2000 / 3000Full
M485.01000 / 2000 / 3000Full
M565.51000 / 2000 / 3000Full
M646.01000 / 2000 / 3000Full

Dimensional & Material Standards

StandardCoversThread
DIN 975Threaded rods, full threadMetric
DIN 976Stud bolts, double endMetric
ISO 898-1Mechanical propertiesMetric
ASME B18.31.3Threaded rods, inchUNC/UNF
ASTM A193High-temp fastenersUNC/UNF
Material StandardRequirement
ASTM A193 B8 Class 1/2SS 347/347H threaded rods
ASTM A276Bar/rod - S34700/S34709
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

SS 347 / 347H Chemical Composition

SS 347 / 347H 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 A276

Element347 (%)347H (%)
Chromium (Cr)17.0-19.017.0-19.0
Nickel (Ni)9.0-13.09.0-13.0
Carbon (C)0.08 max0.04-0.10
Manganese (Mn)2.00 max2.00 max
Silicon (Si)1.00 max1.00 max
Phosphorus (P)0.045 max0.045 max
Sulfur (S)0.030 max0.030 max
Columbium + Tantalum (Nb+Ta)10xC-1.010xC-1.0
Iron (Fe)BalanceBalance
? All heats verified by NABL-accredited spectrometry. PMI and IGC test reports available on request.

Why SS 347 / 347H Alloy Composition Matters for Threaded Rods

Columbium Stabilization — Prevents Sensitization
Columbium (niobium) additions prevent chromium carbide precipitation at grain boundaries, ensuring SS 347 / 347H threaded rods resist intergranular corrosion after welding or prolonged high-temperature exposure.
347H — High Carbon for Creep Strength
The higher carbon content in 347H improves creep resistance and mechanical stability above 550°C, making it the preferred choice for threaded rods in superheater and reheater assemblies.
Austenitic Structure — Non-Magnetic & Tough
The fully austenitic microstructure ensures excellent toughness, ductility, and non-magnetic properties, even at cryogenic temperatures, making these rods suitable for a wide range of demanding environments.

Fastener Performance

SS 347 / 347H Threaded Rods Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for SS 347 / 347H Threaded Rods per ASTM. SS 347 / 347H 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)
M12705628
M1617013657
M2034027289
M24590472128
M301200960210
M3621001680305
M4233002640420
M4848003840570
?? Anti-galling: Use molybdenum-based or PTFE anti-seize. Lubricated values assume K=0.16. Avoid copper-based anti-seize in chloride or high-temp service.

Industry Applications

SS 347 / 347H Threaded Rods Applications — Industries & End Uses

SS 347 / 347H 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 347 / 347H threaded rods are widely used for bolting in reformer tube supports, catalyst baskets, and process piping in hydrogen, ammonia, and ethylene plants. Their resistance to polythionic acid and high-temperature oxidation makes them ideal for critical bolted joints in sulfur and hydroprocessing units.
Threaded rods for superheater, reheater, and economizer assemblies in coal-fired and combined cycle power plants. 347H grade is preferred for high-pressure steam lines and turbine casings due to its superior creep strength and resistance to thermal fatigue.
Used in heat exchanger tie rods, reactor vessel closures, and agitator assemblies where resistance to organic acids, chlorides, and cyclic thermal loading is required. SS 347 / 347H rods outperform 304/316 in environments prone to sensitization.
SS 347 / 347H threaded rods are specified for jet engine test stands, exhaust ducting, and furnace fixtures where high-temperature stability and non-magnetic properties are essential. AMS 5646 and ASTM A193 B8 Class 2 compliance available.

SS 347 / 347H Threaded Rods Standards & International Certifications

SS 347 / 347H 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 347 / 347H Threaded Rods from India's Leading Manufacturer — Get a Competitive Quote Today

Partner with RealBolt — India’s leading manufacturer of certified SS 347 / 347H 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.
022-6743-7972
+91 90226 36025
Email Us

Answers for Buyers

SS 347 / 347H Threaded Rods — Frequently Asked Questions

Browse expert answers to common questions about SS 347 / 347H 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 347 / 347H threaded rods selection and pricing.
SS 347 / 347H threaded rods are supplied to DIN 975 (metric full thread), DIN 976 (studs), ISO 898-1, and ASME B18.31.3 (inch). Material is produced per ASTM A193 B8 Class 1 (347) and Class 2 (347H), with full traceability and EN 10204 3.1/3.2 certification. Custom thread forms (UNC, UNF, BSW) are available on request.
Use a high-temperature molybdenum-based or PTFE anti-seize compound for SS 347 / 347H threaded rods, especially in steam or corrosive service. Avoid copper-based anti-seize in chloride or sulfur environments to prevent galvanic corrosion. Apply to threads and nut faces to prevent galling and ensure accurate preload.
Yes – both SS 347 and 347H are specifically designed for high-temperature service. 347H, with its higher carbon content, offers superior creep resistance above 550°C, making it ideal for boiler, furnace, and superheater bolting. Both grades resist intergranular corrosion after welding or thermal cycling.
No MOQ for standard metric sizes (M10-M36) available ex-stock. Custom diameters, cut lengths, or inch threads typically require a 10 kg minimum. We accept single-piece orders for urgent maintenance and offer price breaks at 50, 200, and 500 pieces.

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