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ASTM A193 Grade B16 Bolts Manufacturer & Exporter in India

Explore ASTM A193 Grade B16 Bolts 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 ASTM A193 Grade B16 Bolts?

ASTM A193 Grade B16 bolts are high-strength alloy steel fasteners engineered for use in high-pressure, high-temperature bolted flange connections. Manufactured from chromium-molybdenum-vanadium steel, these bolts are quenched and tempered to achieve a minimum tensile strength of 860 MPa (125 ksi). B16 bolts are specifically designed for service in power generation, petrochemical, and refinery applications where elevated temperatures up to 593°C (1100°F) are encountered.

ASTM A193 B16 bolts are the industry standard for Class 900-2500 ASME B16.5 and B16.47 flanges, heat exchangers, and pressure vessels. They are supplied with full traceability and mechanical test certification, ensuring compliance with ASME, PED, and NACE MR0175 requirements for critical bolted joints.

Quick Specifications

MaterialAlloy Steel (Cr-Mo-V)
UNS NumberK32045
DIN Number1.7711
Material StandardASTM A193 Grade B16
Bolt Standard (Metric)DIN 931 / DIN 933 / ISO 898-1
Bolt Standard (Inch)ASME B18.2.1
Thread FormISO Metric / UNC / UNF
Diameter RangeM6-M100 / ¼"-4"
Tensile Strength860 MPa (125 ksi) min
Yield Strength690 MPa (100 ksi) min
HardnessMax 35 HRC / 321 HB
? All bolts supplied with EN 10204 3.1 certification. Third-party inspection available.

Complete the Fastener Set

Other ASTM A193 Grade B16 Fastener Products Available from RealBolt

RealBolt also manufactures the complete ASTM A193 Grade B16 fastener range — ASTM A193 Grade B16 Nuts, ASTM A193 Grade B16 Screws, ASTM A193 Grade B16 Washers, ASTM A193 Grade B16 Studs, ASTM A193 Grade B16 Threaded Rods — from certified bar stock per ASTM with full EN 10204 MTC 3.1/3.2 documentation and fast Mumbai dispatch.
ASTM A193 Grade B16 Nuts
ASTM A193 Grade B16 Screws
ASTM A193 Grade B16 Washers
ASTM A193 Grade B16 Studs
ASTM A193 Grade B16 Threaded Rods

Technical Data

ASTM A193 Grade B16 Bolts Dimensions, Sizes & Thread Standards

ASTM A193 Grade B16 Bolts are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 931 (partial thread) / DIN 933 (full thread) / ISO 898-1. Custom lengths in 5mm increments. Inch dimensions available per ASME B18.2.1. All ASTM A193 Grade B16 bolts dimensions conform to applicable DIN, ISO, and ASME B18 standards.

Hex Bolt Dimensions - Metric (DIN 931 / ISO 898-1)

Size (M)Pitch (mm)A/F (mm)Head Ht (mm)Min L (mm)Max L (mm)
M61.0104.010200
M81.25135.312250
M101.5176.416300
M121.75197.520400
M162.02410.025500
M202.53012.530600
M243.03615.040600
M303.54618.750800
M364.05522.5601000
M424.56526.0801000
M485.07530.01001200
M565.58535.01201500
M646.09540.01402000
M726.010545.01602000
M806.011550.01802500
M1006.014563.02003000

Dimensional & Material Standards

StandardCoversThread
DIN 931Hex bolts, partial threadMetric
DIN 933Hex bolts, full threadMetric
ISO 898-1Mechanical propertiesMetric
ASME B18.2.1Hex & heavy hex boltsUNC/UNF
ASME B16.5Stud bolts for flangesUNC
MSS SP-75Stud bolts, high-pressureUNC
Material StandardRequirement
ASTM A193 B16Alloy steel bar/rod
ASTM A962General requirements
NACE MR0175Sour service =35 HRC
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

ASTM A193 Grade B16 Chemical Composition

ASTM A193 Grade B16 Bolts are manufactured from chromium-molybdenum alloy steel with Cr (0.8–1.1%), Mo (0.15–0.65%), and vanadium additions in B16 grades, controlled per ASTM and ASME SA-193. Cr-Mo additions raise hardenability and creep rupture strength for pressure vessel service; vanadium in B16 extends the allowable service temperature to 538°C.

Chemical Composition per ASTM A193 B16

ElementComposition (%)
Carbon (C)0.37-0.49
Manganese (Mn)0.65-1.10
Phosphorus (P)0.035 max
Sulfur (S)0.040 max
Silicon (Si)0.15-0.35
Chromium (Cr)0.75-1.20
Molybdenum (Mo)0.15-0.25
Vanadium (V)0.28-0.33
Nickel (Ni)0.25 max
Copper (Cu)0.20 max
? All heats verified by NABL-accredited spectrometry. PMI available on request.

Why ASTM A193 Grade B16 Alloy Composition Matters for Bolts

Cr-Mo-V Alloy — High-Temperature Strength
The combination of chromium, molybdenum, and vanadium in ASTM A193 B16 steel provides exceptional creep resistance and tensile strength at temperatures up to 593°C, making these bolts ideal for high-pressure steam and hydrocarbon service.
Controlled Carbon & Vanadium — Hardenability
Tightly controlled carbon and vanadium content ensures uniform hardenability and mechanical properties throughout the bolt, critical for large-diameter and long-length fasteners used in pressure vessel and flange assemblies.
Low Phosphorus & Sulfur — Improved Toughness
Low P and S levels reduce the risk of embrittlement and improve impact toughness, ensuring reliable performance in cyclic loading and thermal shock conditions.

Fastener Performance

ASTM A193 Grade B16 Bolts Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for ASTM A193 Grade B16 Bolts per ASTM. ASTM A193 Grade B16 bolts achieve 620 MPa tensile strength, with hardness, yield, and elongation values verified by NABL-accredited testing and reported in the EN 10204 MTC.

Bolt SizeDry (Nm)Lubricated (Nm)Clamp Load (kN)
M121108838
M1627021680
M20540432126
M24930744182
M3018601488289
M3632402592420
M4251604128578
M4876506120760
?? Anti-galling: Use molybdenum-based anti-seize (Molykote 1000). Lubricated values assume K=0.15. Avoid copper-based anti-seize for high-temperature service.

Industry Applications

ASTM A193 Grade B16 Bolts Applications — Industries & End Uses

ASTM A193 Grade B16 Bolts from RealBolt are specified across oil and gas pressure vessels, power generation, and petrochemical where very good corrosion resistance and 620 MPa tensile strength are required for reliable fastener performance. Click each industry below for detailed application examples.
ASTM A193 Grade B16 stud bolts and nuts are the default choice for ASME B16.5/B16.47 Class 900-2500 flanged connections, refinery reactors, and high-pressure separators. Their high strength and temperature resistance ensure leak-free performance in hydrocarbon and steam service.
B16 hex bolts and stud bolts are specified for steam turbine casings, HRSG ducting, and superheater header flanges in combined cycle and fossil fuel power plants. Their creep resistance and mechanical stability at 500°C+ make them ideal for critical bolted joints.
Used for pressure vessel closures, heat exchanger channel covers, and reactor manways in FCC, hydrocracker, and reformer units. B16 bolts withstand cyclic thermal loading and aggressive process media where standard B7 bolts are insufficient.
ASTM A193 B16 bolts are used in high-pressure chemical reactors, autoclaves, and process piping systems handling hot acids, amines, and solvents. Their alloy composition resists embrittlement and maintains strength in harsh chemical environments.

ASTM A193 Grade B16 Bolts Standards & International Certifications

ASTM A193 Grade B16 Bolts 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, hardness test certificate, dimensional inspection report, and proof load test records — available on request for all orders.
Standards
DIN 931 DIN 933 DIN 960 DIN 961 DIN 6914 ISO 4014 ISO 4017 ISO 8676 ISO 8765 ASME B18.2.1 EN 14399 EN 15048 EN ISO 4014 EN ISO 4017 BS EN ISO 4014 BS 3692 BS 4190 IS 1363 IS 1364 IS 3757 SAE J429 UNI 5737 UNI 5739 CSN 021101 PN 82101
Certifications
ISO 9001:2015NACE MR0175NABL LabPED 2014/68/EUMTC 3.1 / 3.2

Buy ASTM A193 Grade B16 Bolts from India's Leading Manufacturer — Get a Competitive Quote Today

Partner with RealBolt — India’s leading manufacturer of certified ASTM A193 Grade B16 Bolts — 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

ASTM A193 Grade B16 Bolts — Frequently Asked Questions

Browse expert answers to common questions about ASTM A193 Grade B16 Bolts from RealBolt — covering ASTM A193 grade, proof load, creep ratings, cryogenic L7 limits, coating options, and EN 10204 documentation. Contact our technical team directly for project-specific guidance on ASTM A193 Grade B16 bolts selection and pricing.
ASTM A193 Grade B16 bolts are available to DIN 931 (metric partial thread), DIN 933 (metric full thread), ISO 898-1, and ASME B18.2.1 (inch hex and heavy hex). Stud bolts are supplied per ASME B16.5 or MSS SP-75 for flange applications. Custom thread forms (BSW, BSF, Whitworth) can be manufactured on request with short lead times.
Use molybdenum-based anti-seize compound (such as Molykote 1000 or Loctite LB 8012) for B16 bolts, especially in high-temperature service. Apply to threads and nut bearing face. Reduce torque values by 20% for lubricated assembly. Avoid copper-based anti-seize for applications above 400°C.
Yes – ASTM A193 B16 bolts can be supplied to meet NACE MR0175/ISO 15156 requirements for sour gas service, provided the maximum hardness does not exceed 35 HRC. Specify NACE compliance at order placement for full documentation and testing.
No formal MOQ for standard sizes (M12-M36) held in stock – single pieces can be supplied for urgent maintenance. Custom sizes or coatings may require a 10 kg minimum. Stud bolt sets for ASME B16.5 flanges are supplied by the set with no minimum. Quantity discounts at 50, 200, and 500 pcs.

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
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  • 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
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  • Malaysia
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