ASTM A193 Grade B7 Specifications
BS 4168-8 defines dimensional requirements for the fastener form shown on this page. ASTM A193 Grade B7 defines the alloy-steel material, heat treatment and mechanical properties; the dimensional standard defines geometry, thread form, tolerances and related product details.
When ordering, state the standard and revision, nominal diameter, thread pitch or threads per inch, length, thread class, required coating, quantity and inspection documentation. Pair Grade B7 bolting with a compatible nut grade such as ASTM A194 Grade 2H when the joint specification requires it.
Dimensions and requirements can change between standard editions. Confirm the latest published standard, service temperature, corrosion conditions and project specification before final selection. See the Grade B7 mechanical properties, chemical composition and contact page for technical or quotation support.
A reliable enquiry defines the finished component, not only the material grade. State the governing dimensional standard, nominal diameter, thread form and pitch, length convention, quantity, surface finish and required delivery condition. Include a drawing when a standard leaves more than one configuration open or when ends, points, drilled features, reduced shanks or non-standard thread lengths are involved.
Confirm the specified B7 material grade, the design temperature and pressure context, and any project material specification. Identify the compatible nut and washer grades. If sour, low-temperature or other special service applies, the responsible engineer should approve the material and supplementary requirements.
Name the dimensional standard and revision, thread class or tolerance, and whether dimensions are checked before or after coating. A coating can affect thread fit and friction, so specify the complete coating system, lubricant condition and mating parts together.
State the certificate type, heat and manufacturing-lot traceability, marking, mechanical tests, chemical analysis and any dimensional or nondestructive examination reports. Additional testing must be invoked before production with its method, sampling and acceptance criteria.
For related decisions, review the material specification, mechanical properties, coating guide, thread guide and testing and certification guide. Technical values should always be verified against the current governing standard and approved project documents.