Home About Products ⤷ Flanges ⤷ Fasteners ⤷ Special Fasteners ⤷ Stud Bolts ⤷ Foundation Bolts ⤷ Pipes & Fittings Industries ⤷ Oil & Gas ⤷ Shipbuilding ⤷ Petrochemical ⤷ Construction Resources ⤷ Product Weight Calculator ⤷ Technical Library ⤷ FAQ ⤷ Certificates Quality & Standards ⤷ Quality ⤷ Standards Gallery Blog Contact
Product Category

Industrial Stud Bolt Manufacturer Chennai

Stainless steel and high tensile studs for critical pipe flange connections. As a leading Industrial Stud Bolt Manufacturer Chennai, we produce ASTM A193 full-thread stud bolts and ASTM A194 heavy hex nuts for all ASME B16.5 flanged joints, Class 150 to Class 2500.

GradeB7 · B7M · B8 · B8M · L7
StandardASTM A193 / A194
Size Range¼" – 4" (M6–M100)
Flange Classes150 · 300 · 600 · 900 · 1500 · 2500
NACEB7M / 2HM Available
Product Overview

High-Performance Stud Bolts for ASME B16.5 Flanged Joints

Looking for reliable stud bolts for critical pipe flange connections? As a leading Industrial Stud Bolt Manufacturer Chennai, Mishkat Pipe Fittings Co. manufactures highly precise ASTM A193 full-thread stud bolts and ASTM A194 heavy hex nuts. Bad stud bolts in pressure piping can result in horrific leaks and plant shutdowns.

Our purpose-built studs support severe thermal expansion, high mechanical loads and high-energy fluid pressures. We deliver fully tested stud sets that keep your industrial piping installations leak-free and secure.

✓ ASTM A193 / A194 Compliant ✓ EN 10204 3.1 MTC Available ✓ NACE MR0175 Grades Stocked
Stud bolts manufactured by Mishkat Pipe Fittings Co.
Product Range

High-Performance Stud Bolts for ASME B16.5 Flanged Joints

Mishkat Pipe Fittings Co. manufactures complete stud bolt sets designed for pressure piping and heavy equipment. We supply full-thread studs pre-matched to ASME B16.5 flange specifications from Class 150 to Class 2500. Our Chennai facility uses German thread-rolling machinery to produce uniform threads that ensure even torque distribution during flange assembly.

ASTM A193 Grade B7 and 2H Heavy Hex Nuts

We produce Grade B7 chromium-molybdenum alloy steel studs paired with Grade 2H heavy hex nuts. These standard sets handle high-pressure process steam, oil lines, and gas flow up to 450°C.

NACE-Compliant B7M and 2HM Stud Sets

Our team supplies Grade B7M studs and 2HM nuts for sour service environments containing corrosive hydrogen sulfide gas. These sets prevent stress corrosion cracking in critical refinery systems.

Fully Pre-Matched Flange Bolt Sets

We simplify your site assembly by supplying correctly sized stud bolt and nut packages. Simply share your flange size, pressure class, and material grade, and we supply ready-to-install sets.

High Tensile

Superior Product Standards from a High Tensile Stud Bolt Manufacturer Chennai

High-pressure steam lines and heavy refineries demand fasteners with high yield strength. Working with an expert High Tensile Stud Bolt Manufacturer Chennai ensures your flanged pipe joints resist pressure spikes and thermal shock. We manufacture high-tensile studs from heat-treated alloy steel that meet exact ASTM strength classes.

Every high-tensile stud batch undergoes hardness testing, tensile load checks, and precise dimensional inspection. We issue EN 10204 Type 3.1 Mill Test Certificates with every delivery to prove metal purity and mechanical performance.

Corrosion Resistance

Maximum Corrosion Resistance from a Stainless Steel Stud Bolt Manufacturer Chennai

Chemical plants offshore platforms and marine facilities need long term protection for stainless steel. Mishkat Pipe Fittings Co, As one of the Top Stainless Steel Stud Bolt Manufacturer Chennai make ASTM A193 Grade B8 (304 stainless steel) and Grade B8M (316 stainless steel) Stud Bolt. Grade B8M studs resist pitting and crevice corrosion in acidic and salt water environments.

We offer specialized surface coatings for carbon steel studs. Choose PTFE fluoropolymer, hot-dip galvanizing, or zinc-nickel plating to protect your studs from chemical attack and atmospheric rust.

Factory Direct

Factory-Direct Supply from a Trusted Stud Bolt Supplier Chennai

Maintaining tight project schedules requires dependable material supply and steady factory dispatch. Choosing a dedicated Stud Bolt Supplier Chennai like Mishkat Pipe Fittings Co. gives you immediate access to large stock reserves and quick order processing.

1. Proven Industrial Experience

We supply top energy, infrastructure, and chemical firms across India. Our client roster includes IOCL, BPCL, HPCL, ONGC, L&T Hydrocarbon, Siemens, and CPCL.

2. German Thread-Rolling Technology

Our studs feature smooth, rolled threads rather than cut threads. Rolled threads offer higher fatigue resistance, better grain structure, and easier nut movement during installation.

3. Complete Material Traceability

We track raw material bar stock from steel mills to final packaging. Every stud bolt bears clear grade markings and heat numbers for full quality verification.

4. Custom Diameters and Cut Lengths

We manufacture non-standard stud lengths and custom thread pitches to match specialized valve bodies, pumps, and custom pressure vessels.

Partnership

Why Partner with an Industrial Stud Bolt Manufacturer Chennai?

Select Mishkat Pipe Fittings Co. as your Industrial Stud Bolt Manufacturer Chennai to safeguard your piping investments and cut plant maintenance costs:

Relying on an established Industrial Stud Bolt Manufacturer Chennai guarantees safety and long-term durability for all high-pressure piping projects.

Industries

Key Industries Served

Mishkat Pipe Fittings Co. delivers tested stud bolts to major industrial sectors:

Petrochemical and Oil Refineries

Grade B7, B7M, and B8M studs for high-pressure process lines and heat exchangers.

Fertilizer and Chemical Plants

Stainless steel stud sets for aggressive acid pipelines and storage tanks.

Power Generation Units

High-tensile alloy studs for high-pressure steam turbines and boiler piping.

Water Treatment and Marine

Corrosion-resistant stainless and galvanized studs for sea water piping systems.
Types & Grades

Stud Bolt Configurations

Click a configuration below to view its full specifications and technical data.

Full Thread Studs
Image coming soon
Material Grades

ASTM A193 / A194 Grade Reference

Mechanical properties for common grades at ambient temperature. For elevated-temperature properties, refer to ASTM A193 Table 4.

ASTM GradeBase MaterialMin Yield (MPa)Min UTS (MPa)Nut GradeTypical Application
A193 B7Cr-Mo Alloy Steel724862A194 2HHigh-temp & high-pressure service
A193 B7MCr-Mo (low hardness)552690A194 2HMH₂S / sour service (NACE MR0175)
A193 L7Alloy (low-temp)724862A194 4Cryogenic / low-temperature
A193 L7MAlloy LT (low-hardness)552690A194 4Low-temp + sour service
A193 B8 Cl.1AISI 304 Stainless207517A194 8Corrosive / chemical service
A193 B8 Cl.2AISI 304 SS (strain-hard)448690A194 8Elevated-temp corrosive
A193 B8M Cl.1AISI 316 Stainless207517A194 8MHigh-corrosion / cryogenic
A193 B8M Cl.2AISI 316 SS (strain-hard)448690A194 8MHigher-temp corrosive
A193 B55Cr-0.5Mo Alloy551793A194 3Very high temperature (500°C+)

Source: ASTM A193 / A194. Values shown for bolts ≤64mm diameter. B7M/L7M for NACE service must comply with NACE MR0175/ISO 15156 hardness limits.

Bolting Data

Stud Bolt Sizes by Flange Class

Required stud diameter and nominal length per ASME B16.5 flange size and pressure class. All threads UNC (Unified National Coarse).

NPS FlangeClass 150Class 300Class 600Class 900No. Bolts (Cl.150)
½"½"×60mm⅝"×75mm⅝"×80mm⅝"×80mm4
¾"½"×70mm¾"×85mm¾"×90mm¾"×90mm4
1"½"×75mm¾"×90mm¾"×100mm¾"×100mm4
1½"½"×85mm¾"×100mm¾"×115mm¾"×115mm4
2"⅝"×95mm⅝"×105mm⅝"×120mm⅝"×125mm4
3"⅝"×110mm¾"×125mm¾"×150mm1"×195mm4
4"⅝"×115mm⅞"×140mm⅞"×165mm1⅛"×235mm8
6"¾"×130mm¾"×160mm¾"×200mm1⅜"×300mm8
8"¾"×145mm⅞"×185mm⅞"×230mm1⅜"×350mm8
10"⅞"×160mm1"×210mm1"×265mm1⅝"×415mm12
12"⅞"×175mm1⅛"×235mm1⅛"×295mm1⅝"×475mm12
16"1"×210mm1¼"×285mm1¼"×360mm2"×600mm16
20"1⅛"×240mm1¼"×335mm1¼"×440mm2¼"×720mm20
24"1¼"×265mm1½"×385mm1½"×520mm2½"×860mm20

Stud lengths shown are nominal including 2 × heavy hex nut height. Always verify against ASME B16.5 Appendix E for exact installed lengths. Mishkat supplies pre-packaged stud + 2 heavy hex nut sets sized to your flange class.

Compliance

Standards & Certifications

ASTM A193
Alloy Steel Bolting
Covers B7, B7M, L7, B8, B8M grades for high-temp and pressure service piping.
ASTM A194
Nuts for Bolting
2H, 2HM, 8, 8M, 4 heavy hex nut grades to pair with A193 studs.
ASME B18.31.2
Stud Bolts
Dimensional standard for stud bolts — UNC threads, chamfer, point geometry.
NACE MR0175
Sour Service
B7M / 2HM requirements for use in H₂S-containing environments. ISO 15156 equivalent.
EN 10204 3.1
Material Certificate
MTC with chemical and mechanical test data certified by the manufacturer's QC.
ISO 9001:2015
Quality System
Mishkat quality management system — Cert No. QMS/23N1031.
Material Grades

Grades & Materials

Alloy Steel (most common)
ASTM A193 B7 (Cr-Mo)ASTM A193 B7M (NACE)ASTM A193 L7 (Low-Temp)ASTM A193 L7M (LT+NACE)A193 B5 (5Cr-0.5Mo)A193 B16 (Cr-Mo-V)
Stainless Steel
ASTM A193 B8 Cl.1 (SS 304)ASTM A193 B8 Cl.2 (SS 304 SH)ASTM A193 B8M Cl.1 (SS 316)ASTM A193 B8M Cl.2 (SS 316 SH)A193 B8T (SS 321)A193 B8C (SS 347)
Nuts — ASTM A194
Grade 2H (CS Heavy Hex)Grade 2HM (NACE)Grade 8 (SS 304)Grade 8M (SS 316)Grade 4 (Low-Temp)
FAQs

Frequently Asked Questions

Q1: What is the main difference between Grade B7 and Grade B8 stud bolts?
Grade B7 is a heat-treated chromium-molybdenum alloy steel built for high-temperature and high-pressure service. Grade B8 is made from austenitic stainless steel, providing superior resistance to chemical rust and organic acids.
Q2: What information do I need to order pre-matched flange stud bolt sets?
Simply provide your pipe flange Nominal Pipe Size (NPS), pressure class (such as Class 150 or Class 300), flange material, and operating temperature. We calculate the exact stud diameter, total length, and nut combination.
Q3: How quickly can I get a Stud Bolt Supplier Chennai to deliver my standard stud bolts?
We hold substantial stocks of standard stud sets of ASTM A193 B7 and A194 2H, in most of the common flange sizes. Standard delivery is 24 to 48 hours and for custom lengths or coated studs it depends on a short production lead time only.
Q4: Do you provide test certificates for your stud bolts?
Yes, all orders would include EN 10204 Type 3.1 Mill Test Certificates (MTC) indicating raw material heat number, chemical analysis of the material, mechanical tensile strength and hardness test.
Q5: Can you supply PTFE fluoropolymer coated stud bolts for chemical plants?
Yes, as a specialized Stainless Steel Stud Bolt Manufacturer Chennai, we provide blue PTFE fluoropolymer coated studs. This low-friction coating protects carbon steel studs from aggressive chemical spills and prevents nut seizing during repairs.
Get In Touch

Contact Mishkat Pipe Fittings Co. Today

Get high-strength, precision-threaded stud bolts delivered directly from our Chennai plant. Contact Mishkat Pipe Fittings Co. today for instant price quotes and expert technical support.

Need a Complete Bolt Set?

Tell us your flange NPS, pressure class and material group — we'll supply the correctly sized stud bolt + nut set, ready to install.

WhatsApp
Also From Mishkat

Related Products

Related Product
Flanges
ASME B16.5 Weld Neck, Slip-On, Blind flanges — supply flanges and matching stud bolt sets together.
→Related Product
Fasteners
Hex bolts, heavy hex nuts, washers and threaded rods for structural and general industrial use.
→Related Product
Special Fasteners
Eye bolts, U-bolts, hook bolts and custom-engineered fasteners to drawing.
→Related Product
Foundation Bolts
L-type, J-type anchor bolts for machinery bases and structural installations.
→