Stud Bolt — A193 B7 / B8M

Description Stud Bolt Supplier India | ASTM A193 B7 B8M | ASME B16.5 | Class 150–2500 | KELOR Supplier: Krishna Industries (KELOR) – Ahmedabad, Gujarat, India Established: 2017 | GSTIN: 24AKLPP6499B1ZT | IEC: AKLPP6499B MOQ: 10 Nos | Metric: M10–M72 | Inch: ½”–3″ Flange Standard: ASME B16.5 Class 150 to 2500 | ASME B16.47 Series A & B Grades: B6, B7, B7M, L7, L7M, B8, B8M, B8T, B16, SS304, SS316, SS321, A2-50, A4-50, A4-70, 4.6, 8.8, 10.9, 12.9 Introduction – Stud Bolt Supplier India Krishna Industries (KELOR), based in Ahmedabad, Gujarat, India, is a trusted B2B supplier of Stud Bolts sourced from verified Indian manufacturers. We supply Stud Bolts conforming to ASTM A193 — grades B7, B7M, L7, L7M, B8, B8M, B8T, B6, B16 — and stainless steel grades SS304, SS316, SS321, A2-50, A4-50, A4-70 — and commercial grades 4.6, 8.8, 10.9, 12.9 — in Metric sizes M10 to M72 and Inch sizes ½” to 3″, with Yellow Zinc, Cad Plated, Teflon Blue, Zinc Plated, and Plain Finish coatings. A Stud Bolt is the universally specified fastener for ASME B16.5 and ASME B16.47 pipe flange joints across Indian EPC, oil and gas, petrochemical, refinery, power, chemical, and process piping projects. It consists of a fully threaded rod — with chamfered ends — used with two heavy hex nuts to clamp pipe flanges together, compress the gasket, and create a pressure-tight joint. Unlike bolts with heads, stud bolts allow equal torque application from both ends — critical for accurate gasket seating and reliable pressure-tight flange joints. When an Indian EPC project BOM, material requisition (MR), or piping specification sheet says “Stud Bolt A193 B7 / A194 2H” — this is the exact product. Krishna Industries supplies matched stud bolt and nut sets — the A193 grade stud bolt paired with the correct A194 nut grade — ready for direct flange assembly. Krishna Industries supplies Stud Bolts to EPC contractors, piping purchase managers, plant maintenance MRO teams, oil and gas project buyers, refinery procurement departments, pressure vessel fabricators, and bulk fastener buyers across Gujarat and PAN India. What Is a Stud Bolt — How Does It Differ From Other Fasteners? EPC purchase managers working across multiple projects frequently deal with three similar but distinct fastener types. Here is a clear comparison to eliminate ordering errors: Feature Stud Bolt Double Ended Stud Full Threaded Stud Threading Fully threaded — chamfered ends Threaded both ends — plain shank middle Fully threaded — entire length Shank No plain shank — full threads Plain unthreaded centre section No plain shank — full threads Nuts Required Two nuts — one each end One nut — one end engages equipment Two nuts or custom engagement ASME Standard ✅ ASME B16.5 / B16.47 pipe flanges Equipment bolting — tapped holes Non-ASME, structural, custom length Indian EPC BOM ✅ “Stud bolt A193 B7 / A194 2H” Pump/valve body bolting “All thread rod” or “full threaded stud” Torque Application Both ends — uniform gasket seating One end fixed — one end torqued Flexible — custom engagement Typical Use All pipe-to-pipe ASME flange joints Flange-to-equipment tapped hole joints Structural, non-pressure, custom If your BOM says “stud bolt” for pipe flange connections — you need this product. Krishna Industries also supplies Double Ended Studs and Full Threaded Studs — confirm your requirement before ordering and we will ensure correct supply. Complete Grade and Material Guide ASTM A193 Stud Bolt Grades — With Matched A194 Nut Stud Bolt Grade Material Tensile Strength Matched Nut Grade Service / Application B6 Martensitic SS 410 125 ksi (862 MPa) A194 Gr 6 Moderate corrosion high strength — valve body, pump flanges B7 Cr-Mo Alloy Steel (4140/4142) 125 ksi (862 MPa) A194 Gr 2H ✅ Most common — all ASME CS pipe flanges, standard Indian EPC spec B7M Cr-Mo (controlled hardness) 105 ksi (724 MPa) A194 Gr 2HM Sour gas / H2S — NACE MR0175 compliant — refinery and offshore L7 Cr-Mo Alloy Steel (low temp) 125 ksi (862 MPa) A194 Gr 4 Low temperature (-100°F / -73°C) — LNG, cryogenic piping L7M Cr-Mo (low temp NACE) 105 ksi (724 MPa) A194 Gr 4 / 2HM Low temperature sour gas combined — offshore cryogenic B8 Austenitic SS304 (CF8) 75 ksi (517 MPa) A194 Gr 8 Corrosion-resistant — SS304 pipe flange joints, food, chemical B8M Austenitic SS316 (CF8M) 75 ksi (517 MPa) A194 Gr 8M Higher corrosion — SS316 flanges, chemical, pharma, coastal B8T Austenitic SS321 (Ti stabilised) 75 ksi (517 MPa) A194 Gr 8T High temp austenitic — SS321 piping, heat exchangers B16 Cr-Mo-V Alloy Steel 150 ksi (1034 MPa) A194 Gr 7 Very high temp / pressure — power plant boiler, steam flanges Stainless Steel Metric Grades Grade Material Proof Load Compatible Nut Best For SS304 / A2-50 AISI 304 / EN 1.4301 500 MPa A2 hex nut General corrosion-resistant SS flange joints SS316 / A4-50 AISI 316 / EN 1.4401 500 MPa A4 hex nut Chloride-resistant — chemical plant, coastal SS316 / A4-70 AISI 316 / EN 1.4401 700 MPa A4 hex nut Higher strength SS316 — offshore, pharmaceutical, high load SS321 AISI 321 / EN 1.4541 — SS321 hex nut High temp — titanium stabilised, no sensitisation Commercial Carbon Steel Grades Grade Tensile Strength Typical Application 4.6 400 / 240 MPa Non-critical general bolting, light structural 8.8 800 / 640 MPa Structural steel, machinery, general industrial flanges 10.9 1000 / 900 MPa High-load structural, automotive, heavy machinery 12.9 1200 / 1080 MPa Critical high-load applications, tooling, heavy flanges Coating Options Coating Corrosion Protection Best For Indian Project Use Yellow Zinc Good — 96–200 hrs salt spray General EPC piping — most common in India Standard spec for B7 stud bolts on most Indian projects Zinc Plated Moderate — 72–96 hrs salt spray Indoor or sheltered service Indoor plant flanges, sheltered installations Cad Plated Excellent — aerospace / defence grade Aerospace, defence, offshore critical Offshore, defence, high humidity environments Teflon Blue (PTFE) Excellent anti-galling torque control SS stud bolts, chemical plant, controlled torque B8M, A4-70 stud bolts on chemical and pharma plant flanges Plain Finish None — bare metal High temp service, customer-applied coating B16 high temp flanges, further processed by buyer Technical Specifications – Stud Bolt Parameter Specification Product Type Stud Bolt — fully threaded, chamfered ends, two heavy hex nuts Material Standard ASTM A193 / A193M | DIN 976 | IS 1367 Nut Standard ASTM A194 / A194M Flange Standard ASME B16.5 Class 150 / 300 / 600 / 900 / 1500 / 2500 Large Bore Flange ASME B16.47 Series A (MSS SP-44) and Series B (API 605) Thread Form Inch: UNC (ASME B1.1) | Metric: ISO coarse (ASME B1.13M) Metric Size Range M10 to M72 Inch Size Range ½” to 3″ Thread Coverage Full length — chamfered ends Length Per ASME B16.5 table for each flange class and nominal bore, or custom Testing Standard ASTM A193 / A194 | API 6A | IS 1367 Marking Grade symbol and manufacturer mark per ASTM A193 MOQ 10 Nos (studs) | Sets of stud 2 nuts available HSN Code 73181500 ASME B16.5 Flange Class to Stud Bolt Grade Reference This is the most searched reference for EPC piping purchase managers ordering stud bolts. Use this table to confirm correct grade for your flange class and service: Flange Material ASME Class Service Stud Bolt Grade Nut Grade Carbon Steel (A105 / WPB) Class 150 – 2500 General process A193 B7 A194 2H Carbon Steel Class 150 – 2500 Sour / H2S service (NACE) A193 B7M A194 2HM Carbon Steel (Low Temp) Class 150 – 600 Low temperature / LNG A193 L7 A194 Gr 4 SS304 (F304 / CF8) Class 150 – 1500 Corrosion-resistant A193 B8 A194 Gr 8 SS316 (F316 / CF8M) Class 150 – 1500 Chemical, pharma, coastal A193 B8M A194 Gr 8M SS321 (F321) Class 150 – 600 High temp austenitic A193 B8T A194 Gr 8T Alloy Steel (P11/P22) Class 600 – 2500 High temp / high pressure A193 B7 A194 2H Chrome-Moly (P91) Class 900 – 2500 Very high temp power plant A193 B16 A194 Gr 7 Always verify against your project piping specification (PMS / piping class sheet) before ordering. Krishna Industries can confirm correct grade from your flange class, service temperature, and fluid — WhatsApp with your piping spec details. All Material Variants — Full Keyword Coverage Krishna Industries supplies the following Stud Bolt variants for Indian EPC, oil and gas, and industrial projects: ASTM A193 B7 stud bolt supplier India yellow zinc. A193 B7 A194 2H stud bolt nut set supplier Ahmedabad. ASTM A193 B7M stud bolt NACE MR0175 sour service supplier India. A193 B7M A194 2HM NACE stud bolt supplier Gujarat. A193 B8 SS304 stud bolt supplier India. A193 B8M SS316 stud bolt chemical plant supplier Ahmedabad. A193 B8M A194 8M stud bolt nut set supplier India. A193 B8T SS321 stud bolt high temperature India. A193 B16 stud bolt power plant boiler supplier India. A193 L7 low temperature stud bolt LNG cryogenic India. SS304 A2-50 stud bolt metric supplier India. SS316 A4-70 stud bolt pharmaceutical plant supplier Ahmedabad. Grade 8.8 stud bolt M16 M20 M24 M30 supplier India. Stud bolt ASME B16.5 Class 150 supplier India. Stud bolt Class 300 Class 600 supplier Ahmedabad. Stud bolt Class 900 Class 1500 Class 2500 supplier India. B7 stud bolt yellow zinc coated bulk EPC supply India. B8M stud bolt Teflon blue anti-galling chemical plant India. Stud bolt metric M10 M16 M20 M24 M30 M36 M48 M64 M72 India. Stud bolt inch ½ inch to 3 inch ASME supplier Ahmedabad Gujarat. Applications in Indian Industries ASME B16.5 pipe-to-pipe flange joints — all pressure classes (150 to 2500) ASME B16.47 large diameter flange bolting — Series A and B Oil and gas pipeline flange joints — upstream, midstream, downstream Refinery process piping flange connections — all units Petrochemical plant piping — all flange classes and service conditions Pressure vessel nozzle and manway flange bolting Heat exchanger shell and channel flange connections Pump and compressor suction and discharge flange bolting Valve body to piping flange connections — gate, globe, ball, check, control valves LNG and cryogenic plant piping flange joints (L7 grade) Sour gas / H2S service pipeline flanges (B7M — NACE MR0175) Power plant boiler and steam piping flange joints (B16 grade) Chemical plant SS316 process piping flanges (B8M, A4-70) Pharmaceutical plant SS316 and SS304 utility piping flanges EPC project complete piping BOM fastener supply EPC Contractors — Bulk Stud Bolt Supply Stud Bolts are the highest volume fastener in every EPC piping project — thousands to tens of thousands of sets across multiple grades, classes, and sizes. Krishna Industries is equipped for complete EPC piping fastener BOM supply: Complete piping BOM fastener supply — all grades and sizes in one consolidated order Matched stud bolt nut sets — A193 stud A194 nut correct grade pairing MTC for all ASTM A193 grades — heat-wise chemical and mechanical properties NACE MR0175 compliance certificate for B7M and L7M grades Hardness test certificates for sour service grades Third party inspection available — TUV, BV, Lloyd’s on request GST invoices — GSTIN: 24AKLPP6499B1ZT — for full input tax credit E-way bill and delivery challan for PAN India transport Fast dispatch from Ahmedabad — 2 to 5 working days standard grades Project-rate bulk pricing for large EPC quantities As a multi-product B2B supplier, Krishna Industries consolidates Stud Bolts with Full Threaded Studs, Double Ended Studs, Hex Bolts, Heavy Hex Nuts, Washers, Pipe Flanges, Pipe Fittings, and Valves in single orders — one supplier, one invoice, one dispatch for complete EPC project piping material procurement. Purchase Managers and MRO Buyers MOQ 10 Nos per line item — accessible for maintenance replacement quantities Stud bolt nut sets supplied together — no separate sourcing of nuts needed Exact spec matching — grade, coating, size, length confirmed per ASME class before supply Heat-wise MTC provided — required for plant QC and maintenance records NACE certification on request for sour service replacements Consistent batch quality from verified manufacturers Fast repeat order processing — share previous PO or BOM line for quickest turnaround GST invoice with full documentation for accounts compliance PAN India Supply Coverage Maharashtra — Mumbai, Pune, Navi Mumbai, Nashik, Aurangabad, Nagpur Gujarat — Ahmedabad, Surat, Vadodara, Rajkot, Bharuch, Ankleshwar, Vapi, Dahej Rajasthan — Jaipur, Jodhpur, Udaipur, Kota, Bhilwara Delhi NCR — Delhi, Noida, Gurgaon, Faridabad, Ghaziabad Tamil Nadu — Chennai, Coimbatore, Madurai, Tirupur, Salem Karnataka — Bangalore, Hubli, Mysore, Belgaum, Mangalore Telangana and Andhra Pradesh — Hyderabad, Vizag, Vijayawada, Kakinada Madhya Pradesh — Indore, Bhopal, Jabalpur, Pithampur Punjab and Haryana — Ludhiana, Amritsar, Chandigarh, Panipat West Bengal — Kolkata, Durgapur, Asansol, Haldia Odisha, Jharkhand, Chhattisgarh — all industrial zones Export supply available FOB Mundra / JNPT for UAE, Saudi Arabia, Vietnam, and other markets. IEC registered exporter — IEC: AKLPP6499B. Quality and Documentation Heat-wise Material Test Certificate (MTC) — ASTM A193 chemical composition and mechanical properties NACE MR0175 / ISO 15156 compliance certificate — B7M and L7M grades Hardness test certificate for sour service and controlled hardness grades Third party inspection — TUV / Bureau Veritas / Lloyd’s on request ASTM A193 grade marking on every stud bolt per standard GST invoice — GSTIN: 24AKLPP6499B1ZT Industrial packaging — grade, size, heat number, coating clearly marked E-way bill and delivery challan for PAN India transport Related Products from Krishna Industries (KELOR) Double Ended Stud — plain shank centre, threaded both ends — for tapped hole bolting Full Threaded Stud — 100% full length thread — for structural and custom length applications Heavy Hex Nut A194 — matched nut grades for all A193 stud bolt grades Plain Washer / Spring Washer — complete fastener set supply Pipe Flange — Slip-on, Weld Neck, Blind, SORF — complete flange joint supply Wafer Check Valve / Butterfly Valve — pipeline valves with flange bolting fasteners All available from Krishna Industries — single GST invoice, consolidated PAN India dispatch. Frequently Asked Questions 1. What is a stud bolt? A stud bolt is a fully threaded fastener with chamfered ends — used with two heavy hex nuts to bolt pipe flanges together per ASME B16.5 and B16.47. It is the standard fastener for all ASME pressure-rated pipe flange joints in Indian EPC, oil and gas, petrochemical, and process piping projects. 2. What is A193 B7 with A194 2H? This is the most commonly specified stud bolt set in Indian EPC piping BOMs. A193 B7 is the stud bolt grade — chromium-molybdenum high-strength alloy steel rated for 125 ksi tensile. A194 2H is the matched heavy hex nut. Together this is the standard fastener set for carbon steel ASME pipe flanges Class 150 through Class 2500 in general process service. 3. What grade for sour gas / H2S service? A193 B7M with A194 2HM — NACE MR0175 / ISO 15156 compliant. Controlled hardness prevents hydrogen-induced cracking in H2S environments. Krishna Industries supplies with NACE compliance certificate. 4. What grade for SS316 pipe flanges? A193 B8M (SS316) with A194 8M heavy hex nut. This is the correct stud bolt for SS316 flanges in chemical plant, pharmaceutical, and coastal service. For higher strength requirement — A4-70 grade is available. 5. What is the difference between stud bolt and double ended stud? Stud bolt is fully threaded end-to-end with chamfered ends — used with two nuts for pipe-to-pipe flange joints. Double ended stud has a plain shank in the middle with threads only at both ends — used where one end screws into a tapped hole in equipment (pump, valve body) and nut engages the other end. 6. Can I get matched stud bolt and nut sets? Yes — matched sets of A193 stud bolt A194 heavy hex nut (correct grade pairing) supplied together. Specify if you need studs only, nuts only, or complete sets. 7. What sizes are available? Metric M10 to M72 and Inch ½” to 3″ — covering all ASME B16.5 and B16.47 flange sizes from 15mm (½”) to 600mm (24″) nominal bore and beyond. 8. What coating for Indian EPC projects? Yellow Zinc (yellow passivate) is the standard coating specified in most Indian EPC project material requisitions for B7 stud bolts. Teflon Blue is standard for SS316 (B8M, A4-70) stud bolts in chemical and pharmaceutical plant flange joints. 9. Do you supply NACE compliance certificates? Yes — NACE MR0175 / ISO 15156 compliance certificates available for B7M and L7M grades. Hardness test reports on request. 10. What is the MOQ? MOQ is 10 Nos per line item. Full piping BOM-based bulk orders welcome with project-rate pricing. 11. Can I order stud bolts together with flanges, fittings, and valves? Yes — Krishna Industries supplies stud bolts, pipe flanges, pipe fittings, valves, and all other piping materials in consolidated single orders — single GST invoice, single dispatch. Share your complete piping BOM for one consolidated quotation. 12. How quickly can you dispatch? Standard grades B7 and B8M in common sizes — 2 to 5 working days from Ahmedabad. Special grades, large sizes, or NACE-certified material — contact us for lead time confirmation. Conclusion The Stud Bolt supplied by Krishna Industries (KELOR) is the ASME B16.5 standard pipe flange fastener — available in ASTM A193 B6, B7, B7M, L7, L7M, B8, B8M, B8T, B16, Stainless Steel SS304, SS316, SS321, A2-50, A4-50, A4-70, and commercial grades 4.6, 8.8, 10.9, 12.9 — Metric M10 to M72 and Inch ½” to 3″ — Yellow Zinc, Cad Plated, Teflon Blue, Zinc Plated, and Plain Finish coatings — supplied with matched A194 heavy hex nuts. Sourced from verified Indian manufacturers with heat-wise MTC, NACE compliance certificates, and complete GST documentation. Fast PAN India dispatch from Ahmedabad. For EPC contractors, piping purchase managers, oil and gas project buyers, MRO teams, and bulk fastener buyers — contact Krishna Industries (KELOR), your trusted Stud Bolt supplier in Ahmedabad, Gujarat, India. Share your piping BOM or flange class list for bulk pricing within 24 hours.