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ASTM A193 B7 Threaded Rods for Flange Bolting

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Introduction

ASTM A193 B7 threaded rods are chromium-molybdenum alloy steel studs, quenched and tempered for high-temperature and high-pressure bolting. The material is usually AISI 4140 or 4142, and the grade carries a minimum tensile strength of 125 ksi and a minimum yield of 105 ksi in sizes up to 2.5 inches. They are cut to length and threaded along the full body, then used with ASTM A194 2H heavy hex nuts on pipe flanges, valves and pressure vessels.

Shanghai Soverchannel Industrial Co., Ltd. produces B7 rods and studs in diameters from 1/4 inch to 4 inch and metric equivalents, using cold-heading and rolling lines in its Nantong Jinzhai Hardware plant, with material certificates and mechanical test reports on request.

Specification

Specification

StandardASTM A193 Grade B7
MaterialAISI 4140 or 4142 chromium-molybdenum alloy steel
Heat treatmentQuenched and tempered
Tensile strength125 ksi minimum (up to 2.5 inch diameter)
Yield strength105 ksi minimum (up to 2.5 inch diameter)
ThreadUNC, 8UN, metric coarse or fine, Class 2A
LengthUp to 4.8 m for rods, cut-to-length studs to drawing
Mating nutASTM A194 Grade 2H heavy hex nut
Surface finishPlain, zinc plated, hot-dip galvanized, PTFE coated
DocumentsMill test certificate, hardness and tensile reports

Advantages

Applications

Machinery Assembly

Frames, gearbox housings, motor mounts and guards where a full thread gives maximum engagement.

Equipment Maintenance

Replacement bolts for pumps, conveyors and crushers, ordered by standard number and class.

Steel Framing

Brackets, base plates and light structural connections.

Automotive Chassis

Cross-members, subframe brackets and suspension mounts where class 8.8 is specified.

Agricultural Machinery

Implement frames and hitch assemblies exposed to dirt and vibration.

Core Features

  1. Hex head: standard wrench sizes allow fast tightening with common tools.
  2. Quenched and tempered core: delivers the 800 MPa tensile level required for class 8.8.
  3. Rolled thread: improves fatigue performance compared with cut threads.
  4. Gauge-checked threads: go and no-go gauges confirm fit before packing.

Frequently Asked Questions

What is the difference between DIN 933 and DIN 931?
DIN 933 is fully threaded, while DIN 931 has a plain shank section. Use DIN 933 for short grips or tapped holes, and DIN 931 when the unthreaded shank should carry shear load.
Is DIN 933 the same as ISO 4017?
Dimensions are very close and the two are used interchangeably in most orders. State both numbers on the purchase order and the drawing to avoid confusion at inspection.
Can I get class 8.8 bolts with a hot-dip galvanized finish?
Yes. Class 8.8 is generally accepted for hot-dip galvanizing. Nuts must then be tapped oversize so the thread still assembles.
What documents can be supplied with an order?
Material certificates, mechanical test reports and coating thickness records can be provided for each batch when requested at the quotation stage.
Why Global B2B Buyers Choose Our Fasteners

EN 10204 3.1 MTC

Every batch comes with full traceability, including material certificates, tensile strength, and hardness test reports to ensure smooth project acceptance.

500+ Tons/Month Capacity

Direct supply from our Nantong Jinzhai Hardware plant. Standard sizes (M8-M24) are kept in stock for 3-7 days rapid dispatch.

100% Thread Gauge Check

Strict go/no-go gauge inspection after thread rolling guarantees perfect 6g tolerance fit, eliminating the risk of stripped threads.

OEM/ODM Flexibility

Support custom lengths, special head shapes, fine threads, and head marking (Logo/Grade) with fast CAD drawing confirmation.

Export Standard Packaging Pallet

Export-Standard Packaging & Logistics

We understand the harsh conditions of international shipping. Our packaging is designed to prevent rust, damage, and customs delays.

  • ISPM 15 Fumigation-Free Wooden Pallets: Meets global customs quarantine requirements for hassle-free clearance.
  • Heavy-Duty Cartons + Inner PE Liner: Double protection against high humidity and salt spray during ocean freight.
  • Customized Shipping Marks: Clear, durable labels with your company info, item number, and quantity for easy warehouse counting.
  • Transparent Packing Data: We provide exact CBM, GW, and carton dimensions in the quotation to help you calculate shipping costs accurately.
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About Us
Shanghai Soverchannel Industrial Co., Ltd.
Shanghai Soverchannel Industrial Co., Ltd. is a manufacturer integrating R&D, production, and sales, focusing on providing high-precision non-standard and standard fastening solutions for customers. China ASTM A193 B7 Threaded Rods for Flange Bolting ManufacturersOEM/ODM ASTM A193 B7 Threaded Rods for Flange Bolting Manufacturers and China ASTM A193 B7 Threaded Rods for Flange Bolting Manufacturers. The company has been deeply engaged in the automotive fastener industry for many years. It owns its own manufacturing plant, Nantong Jinzhai Hardware Co., Ltd., and has accumulated solid technical strength and rigorous quality control experience.

Our main products cover various high-quality bolts, nuts, steel processing parts, welding components, and customized special-shaped parts. China ASTM A193 B7 Threaded Rods for Flange Bolting Manufacturers. Relying on advanced production equipment and a full-process inspection system, we are not only capable of mass-producing high-standard parts but also excel in customizing non-standard bolts and complex special-shaped components according to specific customer requirements. Over the years, we have always adhered to technology-driven development and earned trust through quality, becoming a reliable partner for numerous customers in the automotive and industrial fields.
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