Fastener Product Specifications | ASTM, DIN & ISO

Product Details

ASTM A320 Grade B8M is Type 316 stainless-steel bolting for low-temperature service covered by ASTM A320/A320M. A320 also includes alloy-steel grades such as L7; it is incorrect to treat A320 as only L7 or only stainless steel. The required B8M class/condition and project impact-testing requirements must be confirmed on the purchase order.

Buyer decisions

Required ASTM A320/A320M edition, B8M class/condition and any specified low-temperature test requirement.
Diameter, thread series, rod or stud length, end condition and mating nut grade.
Plain/passivated condition, compatible lubricant and project-specific surface requirement.
MTC, heat-number traceability, test reports, marking and packing.

Selection & Use Steps

Confirm the minimum design metal temperature and governing project specification.
Select A320 B8M and the required class/condition; state any impact-test or supplementary requirement.
Confirm dimensions, thread, end form, mating nuts, surface condition and lubricant.
Review material and test documentation, markings, dimensions and threads before release.
Install with the approved low-temperature joint procedure while controlling cleanliness, lubrication and galling.

Technical Drawing

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

The full-thread reference drawing uses L for end-to-end length and B for effective thread length. The ends are flat with chamfers. Low-temperature material/test requirements belong in the purchase specification and MTC, not in an assumed drawing note.

Application Environment

This product is intended for projects that specify ASTM A320 B8M for low-temperature bolting. Material selection must consider the minimum design metal temperature, corrosion environment, chloride exposure, mating materials and the joint engineer’s requirements.

Installation & Handling Precautions

Do not substitute A193 B8M or another A320 grade without written approval.
Verify class/condition and all required low-temperature test documentation before installation.
Control cleanliness and lubrication to reduce stainless-thread galling.
Keep material identity and heat traceability intact.
Use the approved tightening procedure; torque depends on joint, coating and lubrication.

RFQ Checklist

ASTM A320/A320M Grade B8M and required edition
Class/condition and specified impact-test or supplementary requirements
Diameter, thread series, end-to-end length and chamfer
Mating nut grade, surface condition and lubricant
Quantity, MTC, heat/test traceability, inspection and marking
Minimum design metal temperature, 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 A320 B8M All Thread Rod