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ASTM A193 Grade B16 Screws Manufacturer & Exporter in India

Explore ASTM A193 Grade B16 Screws 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 Screws?

ASTM A193 Grade B16 screws are high-strength alloy steel fasteners manufactured for use in high-pressure, high-temperature bolting applications. Produced from chromium-molybdenum-vanadium steel, these screws are quenched and tempered to achieve superior mechanical properties, including a minimum tensile strength of 860 MPa (125 ksi). ASTM A193 B16 screws are engineered for critical service in petrochemical, power generation, and refinery piping systems, especially where elevated temperatures up to 593°C (1100°F) are encountered.

These screws are specified for bolting pressure vessels, valves, flanges, and fittings in environments where standard B7 fasteners may not provide adequate strength or creep resistance. All material is fully traceable and supplied with EN 10204 3.1 or 3.2 certification for demanding EPC and maintenance projects.

Quick Specifications

MaterialAlloy Steel (Cr-Mo-V)
UNS NumberK32045
DIN Number1.7711
Material StandardASTM A193 Grade B16
Screw Standard (Metric)DIN 912 / ISO 4762 / DIN 933
Screw Standard (Inch)ASME B18.2.1 / B18.3
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 material certified by NABL-accredited laboratory. Heat treatment and mechanical test reports included.

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 Bolts, ASTM A193 Grade B16 Nuts, 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 Bolts
ASTM A193 Grade B16 Nuts
ASTM A193 Grade B16 Washers
ASTM A193 Grade B16 Studs
ASTM A193 Grade B16 Threaded Rods

Technical Data

ASTM A193 Grade B16 Screws Dimensions, Sizes & Thread Standards

ASTM A193 Grade B16 Screws are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 912 (socket head cap), DIN 933 (hex head full thread), ISO 4762, and ASME B18.2.1. Custom lengths available in 5mm increments. Inch sizes per ASME B18.3 and B18.2.1.

Socket Head Cap Screw Dimensions - Metric (DIN 912 / ISO 4762)

Size (M)Pitch (mm)Head Dia (mm)Head Ht (mm)Hex Socket (mm)Min L (mm)Max L (mm)
M61.0106.0510200
M81.25138.0612250
M101.51610.0816300
M121.751812.01020400
M162.02416.01425500
M202.53020.01730600
M243.03624.01940600
M303.54530.02250800
M364.05436.027601000
M424.56342.032801000
M485.07248.0361001200
M565.58456.0411201500
M646.09664.0461402000

Dimensional & Material Standards

StandardCoversThread
DIN 912Socket head cap screwsMetric
DIN 933Hex head screws, full threadMetric
ISO 4762Socket head cap screwsMetric
ASME B18.2.1Hex & heavy hex screwsUNC/UNF
ASME B18.3Socket head cap screwsUNC/UNF
Material StandardRequirement
ASTM A193 B16Alloy steel, quenched & tempered
ASTM A962General fastener requirements
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

ASTM A193 Grade B16 Chemical Composition

ASTM A193 Grade B16 Screws 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 and chemical test reports available on request.

Why ASTM A193 Grade B16 Alloy Composition Matters for Screws

Cr-Mo-V Alloy — High-Temperature Strength
Chromium, molybdenum, and vanadium combine to provide ASTM A193 B16 screws with exceptional strength retention at temperatures up to 593°C (1100°F), making them ideal for steam, hydrocarbon, and process plant bolting.
Controlled Carbon & Manganese
Precise carbon and manganese levels ensure a balance of ductility and toughness, reducing the risk of brittle fracture in high-stress environments.
Low Phosphorus & Sulfur
Strict limits on phosphorus and sulfur minimize the risk of embrittlement and improve weldability, ensuring reliable performance in critical bolted joints.

Fastener Performance

ASTM A193 Grade B16 Screws Mechanical Properties & Torque Reference

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

Screw SizeDry (Nm)Lubricated (Nm)Clamp Load (kN)
M121108845
M1627021690
M20540432140
M24930744200
M3018501480320
M3632002560460
M4251004080620
M4876006080800
?? Anti-galling: Use molybdenum-based anti-seize (Molykote 1000). Lubricated values assume K=0.16. Avoid copper-based anti-seize for high-temperature service.

Industry Applications

ASTM A193 Grade B16 Screws Applications — Industries & End Uses

ASTM A193 Grade B16 Screws 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 screws are the standard for bolting high-pressure piping, valves, and flanges in refinery and petrochemical plants, especially in hydrocracker, reformer, and catalytic cracking units where elevated temperatures and pressures are present.
Used for turbine casing bolting, HRSG ductwork, and steam piping connections in fossil fuel and combined cycle power plants, where high strength and creep resistance are required at temperatures up to 593°C.
Critical for bolting wellhead assemblies, manifolds, and pressure control equipment in upstream oil & gas, where sour gas and high-pressure, high-temperature (HPHT) conditions demand reliable alloy steel fasteners.
Specified for reactor closures, heat exchanger channel covers, and pressure vessel nozzles in chemical plants handling aggressive media and requiring high-strength, temperature-resistant bolting.

ASTM A193 Grade B16 Screws Standards & International Certifications

ASTM A193 Grade B16 Screws 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 84 DIN 85 DIN 912 DIN 913 DIN 914 DIN 915 DIN 916 DIN 6912 DIN 7984 DIN 7985 DIN 7991 DIN 965 ISO 4762 ISO 10642 ISO 14579 ASME B18.3 ASME B18.6.3 EN ISO 4762 IS 1363 IS 1367 SAE J933 SAE J1199
Certifications
ISO 9001:2015PED 2014/68/EUNABL LabMTC 3.1 / 3.2

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

Partner with RealBolt — India’s leading manufacturer of certified ASTM A193 Grade B16 Screws — 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 Screws — Frequently Asked Questions

Browse expert answers to common questions about ASTM A193 Grade B16 Screws 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 screws selection and pricing.
ASTM A193 Grade B16 screws are available to DIN 912 (socket head cap), DIN 933 (hex head full thread), ISO 4762, ASME B18.2.1 (inch hex), and ASME B18.3 (inch socket head). Custom thread forms (UNC, UNF, metric fine) and special lengths can be supplied on request with short lead times.
Use a molybdenum-based anti-seize compound (such as Molykote 1000 or Loctite LB 8012) for assembly. Apply to threads and under the screw head. For high-temperature service, avoid copper-based anti-seize to prevent galvanic corrosion and softening at elevated temperatures.
Yes – ASTM A193 B16 screws are specifically designed for high-temperature bolting applications up to 593°C (1100°F). Their Cr-Mo-V alloy composition ensures strength retention and resistance to creep and relaxation under sustained loads at elevated temperatures.
No formal MOQ for standard sizes (M12-M36) held in stock – we supply from single pieces for urgent maintenance. Custom sizes or non-standard threads typically require a 10 kg minimum. Quantity discounts are available 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