ASTM A193 Grade B7 Screws Manufacturer & Exporter in India

Explore ASTM A193 Grade B7 Screws 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 ASTM A193 Grade B7 Screws?

ASTM A193 Grade B7 screws are high-strength alloy steel fasteners manufactured from quenched and tempered chromium-molybdenum steel, typically conforming to AISI 4140/4142. Designed for bolting pressure vessels, valves, flanges, and fittings for high-temperature or high-pressure service, these screws deliver reliable mechanical performance in demanding environments. B7 screws are widely specified in petrochemical, power generation, and process industries due to their excellent tensile strength, hardness, and resistance to hydrogen embrittlement.

All ASTM A193 Grade B7 screws are supplied with full traceability, mechanical test reports, and are available in a wide range of thread forms and dimensions to suit both metric and inch-based assemblies.

Quick Specifications

Material	Alloy Steel (AISI 4140/4142)
UNS Number	K11597
DIN Number	1.7225
Material Standard	ASTM A193 Grade B7
Screw Standard (Metric)	DIN 912 / DIN 933 / ISO 4762
Screw Standard (Inch)	ASME B18.2.1 / B18.3
Thread Form	ISO Metric / UNC / UNF
Diameter Range	M6-M100 / ¼"-4"
Tensile Strength	860 MPa (125 ksi) min
Yield Strength	720 MPa (105 ksi) min
Hardness	Max 35 HRC / 321 HB

? All screws supplied with EN 10204 3.1 certification. Third-party inspection available on request.

Complete the Fastener Set

Other ASTM A193 Grade B7 Fastener Products Available from RealBolt

RealBolt also manufactures the complete ASTM A193 Grade B7 fastener range — ASTM A193 Grade B7 Bolts, ASTM A193 Grade B7 Nuts, ASTM A193 Grade B7 Washers, ASTM A193 Grade B7 Studs, ASTM A193 Grade B7 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 B7 Bolts

ASTM A193 Grade B7 Nuts

ASTM A193 Grade B7 Washers

ASTM A193 Grade B7 Studs

ASTM A193 Grade B7 Threaded Rods

Technical Data

ASTM A193 Grade B7 Screws Dimensions, Sizes & Thread Standards

ASTM A193 Grade B7 Screws are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 912 (socket head), 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)
M6	1.0	10	6.0	5	10	100
M8	1.25	13	8.0	6	12	120
M10	1.5	16	10.0	8	16	150
M12	1.75	18	12.0	10	20	200
M16	2.0	24	16.0	14	25	250
M20	2.5	30	20.0	17	30	300
M24	3.0	36	24.0	19	40	350
M30	3.5	45	30.0	22	50	400
M36	4.0	54	36.0	27	60	500
M42	4.5	63	42.0	32	80	600
M48	5.0	72	48.0	36	100	800
M56	5.5	85	56.0	41	120	1000
M64	6.0	95	64.0	46	140	1200

Dimensional & Material Standards

Standard	Covers	Thread
DIN 912	Socket head cap screws	Metric
DIN 933	Hex head screws, full thread	Metric
ISO 4762	Socket head cap screws	Metric
ASME B18.2.1	Hex & heavy hex screws	UNC/UNF
ASME B18.3	Socket head cap screws	UNC/UNF

Material Standard	Requirement
ASTM A193 B7	Alloy steel, quenched & tempered
ASTM A320 L7	Low temp variant
ASTM A194 2H	Heavy hex nuts
EN 10204 3.1	Mill test certificate
EN 10204 3.2	TPI-witnessed MTC

Material Chemistry

ASTM A193 Grade B7 Chemical Composition

ASTM A193 Grade B7 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 B7

Element	Composition (%)
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
Nickel (Ni)	0.25 max
Copper (Cu)	0.25 max

? All heats spectro-tested and certified. Full traceability to melt and heat number.

Why ASTM A193 Grade B7 Alloy Composition Matters for Screws

Cr-Mo Alloying — High Strength & Toughness

Chromium and molybdenum additions provide the hardenability and tempering response needed for B7 screws to achieve high tensile and yield strength, even in large diameters.

Low Phosphorus & Sulfur — Clean Steel

Strict limits on P and S ensure ductility and resistance to embrittlement, making B7 screws suitable for cyclic loading and pressure vessel applications.

Quenched & Tempered Microstructure

The specified chemistry enables effective heat treatment, resulting in a tempered martensitic structure for optimal strength and toughness balance.

Fastener Performance

ASTM A193 Grade B7 Screws Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for ASTM A193 Grade B7 Screws per ASTM. ASTM A193 Grade B7 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 Size	Dry (Nm)	Lubricated (Nm)	Clamp Load (kN)
M12	110	88	45
M16	270	216	90
M20	530	424	140
M24	920	736	205
M30	1800	1440	320
M36	3200	2560	460
M42	5100	4080	650
M48	7500	6000	850

?? Anti-galling: Use molybdenum-based or graphite anti-seize. Lubricated values assume K=0.15. Avoid copper-based anti-seize in hydrogen service.

Industry Applications

ASTM A193 Grade B7 Screws Applications — Industries & End Uses

ASTM A193 Grade B7 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.

Oil & Gas - Pressure Vessels & Flanges

ASTM A193 Grade B7 screws are the industry standard for bolting pressure vessels, heat exchangers, and ASME B16.5/B16.47 flanges in upstream and downstream oil & gas facilities. Their high strength and hydrogen embrittlement resistance make them ideal for sour gas and high-pressure applications.

Power Generation - Boilers & Turbines

Used for turbine casing assembly, boiler manways, and steam piping flanges, B7 screws provide reliable performance at elevated temperatures and under cyclic loading in thermal and nuclear power plants.

Chemical & Petrochemical Plants

Critical for reactor closures, process piping, and pressure vessel nozzles in chemical plants, refineries, and fertilizer units where high mechanical strength and consistent quality are essential.

Water Treatment & Desalination

Specified for high-pressure pump assemblies, filter housings, and flange connections in desalination and water treatment plants, where robust mechanical properties and traceability are required.

ASTM A193 Grade B7 Screws Standards & International Certifications

ASTM A193 Grade B7 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 9001:2015EN 10204 3.1PED 2014/68/EUIBR ApprovedTPI Inspection

Buy ASTM A193 Grade B7 Screws from India's Leading Manufacturer — Get a Competitive Quote Today

Partner with RealBolt — India’s leading manufacturer of certified ASTM A193 Grade B7 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.

Answers for Buyers

ASTM A193 Grade B7 Screws — Frequently Asked Questions

Browse expert answers to common questions about ASTM A193 Grade B7 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 B7 screws selection and pricing.

What standards are available for ASTM A193 Grade B7 screws?

ASTM A193 Grade B7 screws are available to DIN 912 (socket head), DIN 933 (hex head full thread), ISO 4762, ASME B18.2.1 (hex head), and ASME B18.3 (socket head). Custom thread forms (UNC, UNF, metric fine) and special lengths can be supplied with short lead times.

What anti-seize compound should be used with B7 screws?

Use a molybdenum-based or graphite anti-seize compound for B7 screws, especially in high-temperature or cyclic service. Avoid copper-based anti-seize in hydrogen or sour gas environments to prevent embrittlement. Apply to threads and bearing surfaces to reduce galling and ensure accurate preload.

Are ASTM A193 Grade B7 screws suitable for high-temperature service?

Yes, B7 screws are rated for continuous service up to 450°C (840°F). For higher temperatures, consider ASTM A193 Grade B16 or stainless steel grades. Always verify application requirements and consult with our technical team for guidance.

What is the minimum order quantity (MOQ) for ASTM A193 Grade B7 screws?

No MOQ for standard sizes (M12-M36) in stock – single piece supply available for urgent needs. Custom sizes or coatings may require a minimum batch of 10 kg. Bulk discounts apply at 50, 200, and 500 pieces.

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