説明
316-series stainless steel flange bolting
ASTM A193 B8M Class 2 Stud Bolts with A194 Grade 8M Nuts
Factory-direct supply of common market sizes and order-specific assemblies for flange, valve and pressure-equipment joints. We review the complete bolting description before confirming supply.
簡単な回答
ASTM A193 B8M Class 2 identifies strain-hardened austenitic stainless steel bolting within ASTM A193/A193M. It is commonly paired with ASTM A194 Grade 8M nuts when the design and purchase specification call for this combination. B8M is associated with a 316-series stainless composition, while “Class 2” is a strength-condition designation and must not be omitted from the RFQ.
ASTM A193/A193M covers bolting for pressure vessels, バルブ, flanges and fittings in high-temperature, high-pressure or other special-purpose service. ASTM A194/A194M covers compatible high-pressure or high-temperature nuts. The applicable edition, 寸法, thread series and design code remain purchase-order requirements.
Product and ordering specification
| 製品 | Stud bolts supplied with ASTM A194 Grade 8M hex nuts; nut and washer quantity as ordered |
|---|---|
| Bolting specification | ASTM A193/A193M, Grade B8M, クラス 2; ordered edition governs |
| Nut specification | ASTM A194/A194M, Grade 8M; style and dimensions as specified |
| Common requirements | ASTM A962/A962M where invoked by the product specification or purchase order |
| Product forms | Fully threaded studs or double-end studs, depending on the drawing and application |
| サイズ範囲 | Standard/common market diameters and lengths; state inch or metric dimensions and do not mix systems |
| スレッド | UNC, 8UN, metric or project-specific thread as ordered; fit and class must be stated |
| 表面状態 | Plain/passivated or order-specific lubricant/coating where technically suitable and confirmed |
| Packaging | Common market and export packaging options, including cartons, cases, bags or order-specific protection |
| Lead time | As fast as 7 working days after technical and commercial confirmation; actual timing varies by size, quantity and inspection scope |
The photographs show representative stainless steel studs and nuts. 学年, クラス, 寸法, marking and documentation are confirmed for the specific order rather than inferred from appearance.
How the bolting set is defined
stud bolt
+
hex nuts
+
thread · length · finish
For a reliable quotation, the material grades must be accompanied by the dimensional and service information. A stud may be measured overall or by effective thread/engagement convention depending on the drawing. Nut height, across-flats dimensions, thread fit and washer requirements also need to match the selected bolting system.
Why Class 2 must be stated explicitly
Grade identifies material family
B8M identifies the molybdenum-bearing austenitic stainless bolting grade. It is not a complete strength or dimensional description.
Class identifies condition
クラス 2 designates a strain-hardened condition under the ordered ASTM requirements. Do not substitute Class 1 とクラス 2 without engineering and purchaser approval.
Diameter affects requirements
Applicable mechanical-property requirements can depend on nominal diameter and the ordered edition. The final acceptance values should be read from that edition.
Documents confirm the order
Required certification, ヒートトレーサビリティ, test reporting and supplementary requirements must be stated in the RFQ and confirmed before production.
Matching ASTM A194 Grade 8M nuts
Grade 8M is the austenitic stainless nut grade normally specified with B8M bolting when the selected design calls for this pairing. Nut style, 寸法, スレッドシリーズ, class of fit and surface condition should be ordered together with the studs. ASTM A194/A194M does not allow grade substitution simply because another nut appears similar; any alternative requires purchaser and engineering review.
Stainless steel threaded assemblies can be sensitive to galling. Lubricant, インストール速度, 表面状態, nut engagement and tightening method influence assembly behavior. Torque values should come from the project bolting procedure or qualified engineering calculation, not from a generic product-page number.
Inspection and documentation options
Identity and marking
Review grade/class marking, サイズ, heat or lot identity and purchase-order traceability as required.
Dimensions and threads
Check diameter, 長さ, スレッドシリーズ, pitch, fit, nut dimensions and assembly quantity against the drawing or order.
Material documentation
Material certificates and test reports are supplied only to the agreed order scope. State the required document type in the RFQ.
Additional inspection
PMI, 追試, third-party inspection and special marking are order-specific and require confirmation.
代表的な用途
This bolting combination may be specified for stainless or corrosion-resistant flange joints, バルブ, 圧力容器, heat exchangers and process equipment. Typical sectors include chemical processing, 水処理, food and beverage systems, pharmaceutical equipment, marine-related service and general industrial piping.
Application examples do not guarantee suitability. 温度, 塩化物への曝露, process chemistry, gasket system, フランジ材質, design pressure, cyclic loading and installation practice all influence the final selection.
見積依頼チェックリスト
- ASTM A193/A193M edition, B8M Class 2 and quantity
- スタッド径, overall length and fully threaded or double-end form
- Thread standard, series/pitch, class of fit and right- or left-hand requirement
- ASTM A194 Grade 8M nut quantity, style and dimensional standard
- Washer requirement and material, 該当する場合
- 無地, passivated, lubricated or project-specific surface condition
- 使用温度, environment and governing design code
- マーキング, トレーサビリティ, 証明書, testing and third-party inspection scope
- Packaging, 行き先, quantity and required delivery date
よくある質問
What does ASTM A193 B8M Class 2 mean?
B8M identifies a 316-series austenitic stainless bolting grade. クラス 2 identifies the strain-hardened condition required by the ordered ASTM A193/A193M edition.
Are ASTM A194 Grade 8M nuts required with B8M Class 2 studs?
Grade 8M is the usual matching stainless nut grade when specified by the design. The governing code, purchaser specification and engineering review decide the final assembly.
Can you supply inch and metric sizes?
We can supply standard/common market inch and metric configurations. The RFQ must clearly state one dimensional system, thread standard, diameter and length.
What is the fastest lead time?
Lead time can be as fast as 7 working days after technical and commercial confirmation. Size, 量, material availability, inspection and packaging determine the actual schedule.
What packaging is available?
Common market and export packaging can be provided, including cartons, bags, wooden cases and order-specific protection. The final method is confirmed with the quotation.
Request a B8M Class 2 stud bolt quotation
Send the diameter, 長さ, 糸, nut/washer quantity, 表面状態, ドキュメント, 梱包, quantity and destination. We will confirm the available supply configuration and schedule.
