Fastener Product Specifications | ASTM, DIN & ISO

Product Details

ASTM A193 Grade B7 is an alloy-steel bolting grade used for pressure vessels, valves, flanges, fittings and other high-temperature, high-pressure or special-purpose service covered by the purchase specification. This product is supplied as a full-thread stud with two ASTM A194 Grade 2H heavy hex nuts when that combination is specified.

What the buyer should confirm

Contract-specified editions of ASTM A193/A193M, ASTM A194/A194M and the applicable flange or joint standard.
Diameter, thread series and fit, end-to-end length, chamfered end form, nut quantity and nut grade.
Plain, black, zinc, hot-dip galvanized or fluoropolymer coating only when compatible with the service and project specification.
Heat-number traceability, MTC content, inspection scope, marking and packing.

Coating and lubrication change thread fit and the torque-tension relationship. They must be agreed together with the mating nuts and the approved assembly procedure.

Selection & Use Steps

Identify the joint, service temperature, pressure, corrosion exposure and governing project specification.
Confirm B7 material, diameter, thread series, length definition and the required A194 2H nuts.
Select surface condition and lubricant as one bolting system; confirm coating allowance and free nut run.
Review the MTC, heat number, dimensions, thread condition, markings and coating before release.
Install only to the flange or joint engineer’s approved tightening method and sequence; do not use an unverified generic torque chart.

Technical Drawing

All-thread stud drawing showing end-to-end length and effective thread length

The drawing distinguishes end-to-end length L from effective thread length B (thread-to-thread). Thread-to-thread is not thread pitch. Both ends are flat chamfered ends, not conical points.

Confirm diameter, pitch or threads per inch, thread tolerance, chamfer, coating allowance and nut engagement on the approved manufacturing drawing.

Application Environment

Typical applications include bolted flanges, valves, fittings and pressure-equipment joints where the project calls for ASTM A193 B7. Suitability depends on the full joint design, operating temperature and pressure, corrosion exposure, coating system and assembly procedure.

For wet, marine, chemical or otherwise corrosive exposure, do not assume bare B7 is adequate. The project engineer must select a compatible coating, material alternative or corrosion-control system.

Installation & Handling Precautions

Keep studs and nuts matched by specified grade, size, thread and coating system.
Check that nuts run freely by hand before installation; do not force coated or damaged threads.
Protect threads, chamfers, markings and traceability during transport and storage.
Control lubricant and coating condition because both affect preload.
Use the approved cross-pattern or multi-pass procedure for the actual flange joint; reject unidentified or damaged components.

RFQ Checklist

ASTM A193/A193M B7 and ASTM A194/A194M 2H, including required standard edition
Diameter and thread: UNC, 8UN or project-specified series
End-to-end length, effective thread length and end chamfer
Two nuts per stud or other set configuration
Surface condition, coating, lubricant and colour requirement
Quantity, MTC, heat-number traceability, inspection and marking
Flange list, BOM, approved drawing, packing and destination

Product reference gallery

Form and finish reference; final compliance follows order documents.

Ordering framework

Confirm the specification before quotation.

This product page identifies the available product family and basic supply range. Final compliance depends on the exact standard, grade, dimensions, finish, mating components, tests and documents stated on the purchase order or approved drawing.

01Standard and editionState the governing product standard, drawing or approved equivalent.

02Grade and classConfirm material grade, property class, condition and any supplementary requirement.

03Size and threadDiameter, pitch or TPI, thread series, fit or tolerance and handedness where applicable.

04Length and geometryOverall or effective length, head or end style, thread length and drawing dimensions.

05Finish and assemblyCoating standard, thickness or color, lubrication and mating-part compatibility.

06Quantity and evidenceLot quantity, packing, marking, MTC, inspection scope and destination requirements.

Request this product with a complete specification.

Product · standard · grade · size · finish · quantity · documents · destination

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ASTM A193 B7 Stud Bolt with A194 2H Nuts