SS 304 / 304L / 304H Threaded Rods Manufacturer & Exporter in India

Explore SS 304 / 304L / 304H Threaded Rods Manufacturer & Exporter in India manufactured for demanding industrial applications with reliable strength, corrosion resistance and compliance with international standards.

-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 304 / 304L / 304H Threaded Rods?

SS 304 / 304L / 304H threaded rods are austenitic stainless steel fasteners manufactured from UNS S30400, S30403, and S30409 bar stock conforming to ASTM A276 and ASTM A479. The 18% chromium and 8% nickel composition delivers reliable corrosion resistance across a broad range of industrial environments, while the three sub-grades address distinct service requirements – standard, low-carbon, and high-carbon stabilised variants.

Grade 304L limits carbon to 0.030% max, eliminating sensitisation risk in welded assemblies without post-weld heat treatment. Grade 304H, with carbon held at 0.04-0.10%, provides superior creep strength above 425°C and is the preferred choice for elevated-temperature pressure vessel and boiler applications per ASME Section VIII. All three grades are widely specified under ASTM A193 and ASME B18.31.3 for general industrial, chemical, and structural threaded rod applications worldwide.

Quick Specifications

Material	SS 304 / 304L / 304H
UNS Number	S30400 / S30403 / S30409
DIN Number	1.4301 / 1.4307 / 1.4948
Material Standard	ASTM A276 / ASTM A479 / ASTM A193
Threaded Rod Standard (Metric)	DIN 975 / DIN 976 / ISO 4032
Threaded Rod Standard (Inch)	ASME B18.31.3 / ASTM F1554
Thread Form	ISO Metric / UNC / UNF
Diameter Range	M6-M100 / ¼"-4"
Tensile Strength (304)	515 MPa (75 ksi) min
Yield Strength (304)	205 MPa (30 ksi) min
Hardness	Max 92 HRB / 201 HB

? All material certified by NABL-accredited laboratory. PMI and heat traceability available on request.

Complete the Fastener Set

Other SS 304 / 304L / 304H Fastener Products Available from RealBolt

RealBolt also manufactures the complete SS 304 / 304L / 304H fastener range from certified bar stock per ASTM, including Bolts, Nuts, Screws, Washers, and Studs in all standard configurations. All SS 304 / 304L / 304H fastener types ship with EN 10204 MTC 3.1/3.2 documentation and are available in standard sizes and custom-machined specials.

SS 304 / 304L / 304H Bolts

SS 304 / 304L / 304H Nuts

SS 304 / 304L / 304H Screws

SS 304 / 304L / 304H Washers

SS 304 / 304L / 304H Studs

Technical Data

SS 304 / 304L / 304H Threaded Rods Dimensions, Sizes & Thread Standards

SS 304 / 304L / 304H Threaded Rods are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 975 (full-length thread) / DIN 976 (stud with plain shank) / ASME B18.31.3. Custom lengths available in 5 mm increments. Inch dimensions per ASTM F1554 and ASME B18.31.3.

Threaded Rod Dimensions - Metric (DIN 975 / DIN 976)

Size (M)	Pitch (mm)	Tolerance Class	Standard Length (mm)	Max Custom Length (mm)
M6	1.0	6g	1000	3000
M8	1.25	6g	1000	3000
M10	1.5	6g	1000	3000
M12	1.75	6g	1000	3000
M16	2.0	6g	1000	3000
M20	2.5	6g	1000	3000
M24	3.0	6g	1000	3000
M30	3.5	6g	1000	3000
M36	4.0	6g	1000	3000
M42	4.5	6g	1000	3000
M48	5.0	6g	1000	3000
M56	5.5	6g	1000	3000
M64	6.0	6g	1000	3000
M72	6.0	6g	1000	3000
M80	6.0	6g	1000	3000
M100	6.0	6g	1000	3000

Dimensional & Material Standards

Standard	Covers	Thread
DIN 975	Threaded rod, full thread, 1 m / 2 m / 3 m	Metric
DIN 976-1	Stud bolts with plain shank	Metric
ISO 4032	Hex nuts for threaded rods	Metric
ASME B18.31.3	Continuous threaded rod, inch	UNC/UNF
ASTM F1554	Anchor bolts and threaded rods	UNC
ASME B1.1	Unified inch screw threads	UNC/UNF
ASME B1.13M	Metric screw threads	Metric

Material Standard	Requirement
ASTM A276	Stainless steel bar and shapes
ASTM A479	Stainless steel bar for pressure vessels
ASTM A193 B8 / B8L / B8H	Alloy steel bolting for high-temp service
EN 10204 3.1	Mill test certificate
EN 10204 3.2	TPI-witnessed MTC

Material Chemistry

SS 304 / 304L / 304H Chemical Composition

SS 304 / 304L / 304H 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 / A479

Element	Grade 304 (%)	Grade 304L (%)	Grade 304H (%)
Carbon (C)	0.08% max	0.030% max	0.04-0.10%
Chromium (Cr)	18.0-20.0%	18.0-20.0%	18.0-20.0%
Nickel (Ni)	8.0-10.5%	8.0-12.0%	8.0-10.5%
Manganese (Mn)	2.0% max	2.0% max	2.0% max
Silicon (Si)	0.75% max	0.75% max	0.75% max
Phosphorus (P)	0.045% max	0.045% max	0.045% max
Sulphur (S)	0.030% max	0.030% max	0.030% max
Nitrogen (N)	0.10% max	0.10% max	0.10% max
Iron (Fe)	Balance	Balance	Balance

? All heats verified by NABL-accredited spectrometry. PMI and full chemical traceability available on request.

Why SS 304 / 304L / 304H Alloy Composition Matters for Threaded Rods

304L — Low Carbon for Weld-Zone Integrity

By capping carbon at 0.030%, grade 304L prevents chromium carbide precipitation at grain boundaries during welding. Threaded rods cut into welded assemblies or anchor plates retain full corrosion resistance in the heat-affected zone without requiring post-weld annealing.

304H — Elevated Carbon for Creep Resistance

The controlled carbon range of 0.04–0.10% in grade 304H significantly improves creep and stress-rupture strength above 425°C. This makes 304H threaded rods the correct choice for ASME Section VIII pressure vessel nozzle connections and high-temperature heat exchanger tie rods.

18Cr-8Ni — Passive Film Stability

The 18% chromium content forms a self-repairing passive oxide layer that resists atmospheric corrosion, mild acids, and food-grade environments. Combined with 8–10.5% nickel for austenite stability, SS 304 threaded rods maintain structural integrity across temperatures from -196°C to 870°C in non-sensitising service.

Fastener Performance

SS 304 / 304L / 304H Threaded Rods Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for SS 304 / 304L / 304H Threaded Rods per ASTM. SS 304 / 304L / 304H 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.

Tightening Torque Reference - SS 304 Threaded Rods (Metric, Class 6g)

Rod Size	Dry (Nm)	Lubricated (Nm)	Clamp Load (kN)
M8	14	11	7
M10	28	22	14
M12	48	38	22
M16	118	94	54
M20	230	184	87
M24	400	320	124
M30	800	640	198
M36	1380	1104	288

?? Anti-galling: SS 304 threaded rods are prone to galling under high torque. Always use PTFE-based or molybdenum disulphide anti-seize lubricant. Lubricated values assume K=0.17. Never dry-torque stainless steel rods at high speed.

Industry Applications

SS 304 / 304L / 304H Threaded Rods Applications — Industries & End Uses

SS 304 / 304L / 304H 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.

Construction & Structural Engineering

SS 304 threaded rods are the standard fastening element for suspended ceiling systems, curtain wall cladding anchors, structural steel connections, and concrete anchor bolt assemblies. Their corrosion resistance eliminates the need for protective coatings in interior and semi-exposed environments, reducing long-term maintenance costs on commercial and industrial building projects.

Food Processing & Pharmaceutical Equipment

Grade 304L threaded rods are specified for hygienic equipment frames, conveyor support structures, tank mounting assemblies, and clean-room racking systems. The low-carbon variant ensures weld-zone integrity when rods are incorporated into welded stainless steel frames, and the smooth passive surface resists bacterial adhesion in compliance with FDA and EHEDG guidelines.

Chemical & Water Treatment Plants

SS 304 and 304L threaded rods are widely used in water treatment filter housings, chemical dosing skid frames, pipe support hangers, and pump base plate assemblies. Their resistance to dilute acids, alkalis, and chlorinated water at ambient temperature makes them a cost-effective alternative to duplex or nickel alloy fasteners in low-to-moderate corrosivity service.

HVAC, Plumbing & MEP Services

Threaded rods in SS 304 are the preferred choice for pipe hanger systems, duct support trapeze assemblies, and mechanical equipment mounting in commercial HVAC installations. Compliance with MSS SP-58 and NFPA 13 hanger standards makes them directly interchangeable with carbon steel rods while providing superior corrosion resistance in humid plant rooms and rooftop installations.

SS 304 / 304L / 304H Threaded Rods Standards & International Certifications

SS 304 / 304L / 304H 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 / 3.2ASME Section VIII

Buy SS 304 / 304L / 304H Threaded Rods from India's Leading Manufacturer — Get a Competitive Quote Today

Partner with RealBolt — India’s leading manufacturer of certified SS 304 / 304L / 304H 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.

Answers for Buyers

SS 304 / 304L / 304H Threaded Rods — Frequently Asked Questions

Browse expert answers to common questions about SS 304 / 304L / 304H 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 304 / 304L / 304H threaded rods selection and pricing.

What is the difference between SS 304, 304L, and 304H threaded rods?

The three grades share the same 18Cr-8Ni base composition but differ in carbon content and resulting performance. Grade 304 (C max 0.08%) is the general-purpose option for most structural and industrial applications. Grade 304L (C max 0.030%) is specified wherever threaded rods will be incorporated into welded assemblies, as the ultra-low carbon prevents sensitisation and intergranular corrosion in the heat-affected zone without post-weld heat treatment. Grade 304H (C 0.04-0.10%) is the ASME Code-approved choice for service above 425°C, where the controlled higher carbon content delivers superior creep and stress-rupture strength. For ambient-temperature structural applications, 304 or 304L are interchangeable. For pressure vessel and boiler service above 425°C, always specify 304H per ASME Section VIII.

What thread standards are available for SS 304 threaded rods?

SS 304 / 304L / 304H threaded rods are available in ISO metric threads per DIN 975 and DIN 976-1 (tolerance class 6g), unified inch threads (UNC and UNF) per ASME B18.31.3 and ASME B1.1, and BSW / BSF Whitworth threads on request. Standard metric lengths are 1 m, 2 m, and 3 m. Custom lengths up to 3 m are cut to order in 5 mm increments. Left-hand thread, fine-pitch metric, and BSPP thread forms are available with 10-15 working day lead time.

Are SS 304 threaded rods prone to galling, and how can it be prevented?

Yes – austenitic stainless steels including SS 304 are susceptible to galling (cold welding of mating thread surfaces) under high contact pressure and rotational friction. To prevent galling when assembling SS 304 threaded rods with stainless steel nuts, always apply a PTFE-based thread lubricant or molybdenum disulphide anti-seize compound to the threads before assembly. Tighten nuts slowly using a calibrated torque wrench rather than an impact driver. Using a dissimilar-material nut (e.g., SS 316 nut on a 304 rod) also reduces galling risk. Reduce published dry torque values by approximately 20% when using lubricant.

What certifications and test reports are supplied with SS 304 / 304L / 304H threaded rods?

All threaded rods are supplied with an EN 10204 3.1 Mill Test Certificate as standard, covering chemical composition, mechanical properties, and heat number traceability. EN 10204 3.2 TPI-witnessed certificates are available on request for pressure vessel and nuclear applications. Additional documentation available includes NABL-accredited laboratory test reports, positive material identification (PMI) reports, dimensional inspection reports per DIN 975 / ASME B18.31.3, and REACH / RoHS compliance declarations for export to EU markets.

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Ahmedabad
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