Fastener Product Specifications | ASTM, DIN & ISO

Product Details

ASTM A193 Grade B8M is stainless-steel bolting based on Type 316 stainless steel. ASTM A193 includes B8 and B8M grades; B8 is based on Type 304 stainless steel, while B8M is based on Type 316 stainless steel. The required class and condition must be stated because Class 1 and Class 2 are not interchangeable descriptions.

Selection points

Confirm B8M grade, class, diameter, thread series, stud length and mating nut grade.
Evaluate chloride exposure, temperature, joint design and the risk of galvanic interaction with other metals.
Specify passivation, lubricant or other surface requirement only when required by the project.
Confirm MTC, heat identity, marking, inspection and packing.

Stainless appearance alone does not prove grade or condition. Procurement should rely on the specified standard, traceability and required inspection documents.

Selection & Use Steps

Confirm the service environment, governing standard and corrosion requirements.
Select B8M grade and the required class/condition; confirm diameter, thread and end-to-end length.
Specify compatible nuts, washers, lubricant and any passivation requirement.
Verify material documents, heat identity, dimensions and thread condition before assembly.
Install with an approved stainless-bolting procedure that controls lubrication, tightening and galling risk.

Technical Drawing

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

The drawing shows a full-thread stud with flat chamfered ends. L is end-to-end length; B is effective thread length measured thread-to-thread. B is not thread pitch.

Confirm thread series, tolerance, chamfer, class/condition and mating-nut engagement on the approved drawing and purchase order.

Application Environment

B8M is selected where Type 316 stainless steel is specified for the bolting system. Actual suitability depends on chloride level, temperature, crevice conditions, mating materials and cleaning or maintenance regime.

Type 316 stainless steel is not automatically suitable for every marine, chemical or high-temperature environment. The project material specification remains controlling.

Installation & Handling Precautions

Do not mix B8M classes or substitute B8 for B8M without written engineering approval.
Use clean, compatible lubricants and controlled assembly practices to reduce stainless-thread galling.
Keep stainless parts free from carbon-steel contamination during storage and handling.
Confirm mating nut grade, thread fit and free nut run before installation.
Do not apply a generic torque value; use the approved procedure for the actual lubrication and joint.

RFQ Checklist

ASTM A193/A193M Grade B8M and required class/condition
Diameter, thread series, end-to-end length and chamfer
Mating nut grade and quantity per stud
Plain/passivated condition, lubricant and any coating requirement
Quantity, MTC, heat traceability, PMI or inspection if contractually required
Application, 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 B8M Stud Bolt