Double Ended Stud

Description Double Ended Stud | B7 B8M SS304 SS316 | M10–M72 | ½”–3″ | Supplier India Supplier: Krishna Industries (KELOR) – Ahmedabad, Gujarat, India Established: 2017 | GSTIN: 24AKLPP6499B1ZT | IEC: AKLPP6499B MOQ: 10 Nos | Metric Size: M10–M72 | Inch Size: ½”–3″ 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 – Double Ended Stud Supplier India Krishna Industries (KELOR), based in Ahmedabad, Gujarat, India, is a trusted B2B supplier of Double Ended Studs sourced from verified Indian manufacturers. We supply Double Ended Studs across all major material grades — ASTM A193 B7, B7M, B8, B8M, B8T, B6, B16, Stainless Steel 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 Double Ended Stud — also called a Stud Bolt — is a headless fastener with threads at both ends and a plain (unthreaded) shank in the middle. It is the standard fastener for ASME B16.5 and ASME B16.47 pipe flange joints across Indian EPC, oil and gas, petrochemical, power, chemical, and process piping projects. One threaded end engages the flange or equipment, and a nut is torqued onto the other threaded end to clamp the joint. The double ended stud design — with controlled thread length at each end and a defined plain shank — allows precise bolt stress calculation, uniform load distribution across the flange gasket, and accurate torquing per flange assembly procedures. This is why double ended studs are the mandatory fastener type for all ASME pressure-rated pipe flanges in Indian EPC project specifications. Also referred to as: Stud Bolt, Double End Stud, Tap End Stud, Equal Leg Stud, ASME Stud Bolt — all referring to the same product used for pipe flange bolting across Indian process industries. Double Ended Stud vs Full Threaded Stud — Critical Difference for EPC Buyers EPC purchase managers and piping material engineers must understand this difference before ordering — wrong fastener type on a pressure flange joint is a serious quality non-conformance: Feature Double Ended Stud (Stud Bolt) Full Threaded Stud (All Thread Rod) Threading Both ends only — plain shank in middle 100% full length threaded — no plain shank Shank Plain / unthreaded centre section No plain shank — threaded end to end ASME Standard ✅ ASME B16.5 / B16.47 pipe flange standard Not standard for ASME pressure flanges Flange Bolting ✅ Correct for all ASME pressure-rated pipe flanges Used for non-ASME flanges, structural, custom Bolt Stress Control ✅ Precise — defined thread and shank length Less precise for pressure flange torquing Cut to Length Fixed per ASME flange class and nominal bore Cut to any custom length from bar Indian EPC Spec ✅ Standard — specified in all Indian piping BOMs Used for non-piping structural and general use Typical Use Pipe flanges, pressure vessels, pumps, valves Structural bolting, equipment, custom connections Rule for EPC purchase managers: If your BOM says “stud bolt” for pipe flange bolting — order Double Ended Stud (plain shank, threaded both ends). If it says “all thread rod” or “full threaded stud” — order Full Threaded Stud. Krishna Industries supplies both — contact us to confirm correct type before ordering. Complete Grade and Material Guide — All Available Variants ASTM A193 High Tensile and High Temperature Grades Grade Material Tensile Strength Compatible Nut Best For Typical Application B6 Martensitic SS 410 125 ksi (862 MPa) A194 Gr 6 Moderate corrosion high strength Valve body flanges, pump casings, moderate chemical B7 Cr-Mo Alloy Steel (4140/4142) 125 ksi (862 MPa) A194 Gr 2H Most widely used — high strength, high temp All ASME pipe flanges, pressure vessels — standard Indian EPC spec B7M Cr-Mo (controlled hardness) 105 ksi (724 MPa) A194 Gr 2HM Sour gas / H2S — NACE MR0175 compliant Sour gas pipelines, offshore refinery H2S flanges L7 Cr-Mo Alloy Steel (low temp) 125 ksi (862 MPa) A194 Gr 4 Low temperature — (-100°F / -73°C) rated LNG, cryogenic, low-temp process piping flanges L7M Cr-Mo (low temp NACE) 105 ksi (724 MPa) A194 Gr 4 / 2HM Low temp sour gas combined Offshore cryogenic sour gas service B8 Austenitic SS304 (A2) 75 ksi (517 MPa) A194 Gr 8 Corrosion-resistant — general chemical Chemical plant, food processing SS304 flange joints B8M Austenitic SS316 (A4) 75 ksi (517 MPa) A194 Gr 8M Higher corrosion — chloride and aggressive media Chemical plant, pharmaceutical, coastal, chloride service B8T Austenitic SS321 (Ti stabilised) 75 ksi (517 MPa) A194 Gr 8T High temp — sensitisation resistant High temp chemical, heat exchangers, SS321 piping B16 Cr-Mo-V Alloy Steel 150 ksi (1034 MPa) A194 Gr 7 Very high temp and pressure Power plant steam flanges, boilers, high temp pressure vessels Stainless Steel Metric Grades (DIN / ISO) Grade Material Proof Load Compatible Nut Best For Typical Application SS304 / A2-50 AISI 304 / EN 1.4301 500 MPa A2 hex nut General corrosion-resistant service Food processing, water treatment, general industrial SS flanges SS316 / A4-50 AISI 316 / EN 1.4401 500 MPa A4 hex nut Chloride-resistant — standard grade Chemical plant, coastal, moderate corrosive media flanges SS316 / A4-70 AISI 316 / EN 1.4401 700 MPa A4 hex nut Chloride-resistant higher strength High-load chemical flanges, offshore, pharmaceutical GMP SS321 AISI 321 / EN 1.4541 — SS321 hex nut High temp — Titanium stabilised High temperature flanges, heat exchangers, SS321 piping systems Commercial Carbon Steel Grades (IS / DIN / ISO) Grade Tensile Strength Best For Typical Application 4.6 400 / 240 MPa Low load, general service Non-critical bolting, general construction 8.8 800 / 640 MPa Medium-high load — most common Structural steel, machinery, industrial equipment 10.9 1000 / 900 MPa High load structural and industrial Heavy structural, automotive, high-load flanges 12.9 1200 / 1080 MPa Highest tensile — critical applications Critical structural, tooling, heavy machinery Coating Options Coating Corrosion Protection Best For Typical Use Yellow Zinc Good — 96–200 hrs salt spray General industrial — most common in India ASME pipe flange bolting, EPC piping projects Zinc Plated Moderate — 72–96 hrs salt spray Indoor / sheltered industrial service Indoor plant equipment, general assembly Cad Plated Excellent — aerospace and defence grade Aerospace, defence, high humidity Aerospace, defence, critical offshore flanges Teflon Blue (PTFE) Excellent anti-galling torque control SS fasteners, chemical service, controlled torque Chemical plant, SS316 flange joints, anti-seize service Plain Finish None — bare metal High temp service or customer-applied coating High temperature flanges, customer further processing Technical Specifications – Double Ended Stud Parameter Specification Product Type Double Ended Stud (Stud Bolt — plain shank, threaded both ends) Thread Form Metric ISO coarse / fine | Inch UNC / UNF Metric Size Range M10 to M72 Inch Size Range ½” to 3″ Thread Length As per ASME B16.5 / B16.47 flange class and nominal bore, or custom Shank Plain / unthreaded centre section Flange Standard ASME B16.5 Class 150 to Class 2500 | ASME B16.47 Series A and B Material Standard ASTM A193 / A193M (B grades), DIN 939, IS 1367 Testing Standard ASTM A193 / A194, IS 1367, ASME B18.31.2 Compatible Nuts ASTM A194 — Grade specific (2H for B7, 8M for B8M — see grade table) MOQ 10 Nos HSN Code 73181500 ASME Flange Class Guide — Which Grade Stud Bolt for Your Flange? EPC piping engineers and purchase managers use this as a quick reference for stud bolt grade selection against ASME flange class: ASME Flange Class Typical Stud Bolt Grade Compatible Nut Grade Service Class 150 — Carbon Steel B7 (A193) 2H (A194) General process service — most common Indian EPC spec Class 300 — Carbon Steel B7 (A193) 2H (A194) Higher pressure process service Class 600 and above B7 (A193) 2H (A194) High pressure — refinery, petrochemical Class 150 — SS304 Flange B8 (A193) 8 (A194) SS304 pipe flange corrosion-resistant service Class 150 — SS316 Flange B8M (A193) 8M (A194) SS316 flange — chemical, pharmaceutical, coastal Sour Service — Any Class B7M (A193) 2HM (A194) H2S / sour gas — NACE MR0175 mandatory Low Temperature — Any Class L7 (A193) 4 (A194) LNG, cryogenic, sub-zero service High Temp Steam — Power Plant B16 (A193) 7 (A194) Boiler, steam, power plant high temp flanges Always verify stud bolt grade against your project piping specification sheet or flange data sheet. Krishna Industries can assist with grade confirmation before order — WhatsApp or email with your flange class, service, and temperature for fastest response. All Material Variants — Full Keyword Coverage Krishna Industries supplies the following Double Ended Stud and Stud Bolt variants for Indian EPC and industrial projects: ASTM A193 B7 double ended stud yellow zinc coated supplier India. A193 B7 stud bolt with A194 2H nut set supplier Ahmedabad. A193 B7M double ended stud NACE sour service supplier India. A193 B8 SS304 double ended stud supplier Gujarat. A193 B8M SS316 double ended stud chemical plant supplier India. A193 B8M stud bolt A194 8M nut set supplier Ahmedabad. A193 B8T SS321 high temperature stud bolt India. A193 B16 double ended stud power plant boiler flange India. SS304 double ended stud A2-50 metric supplier India. SS316 A4-70 double ended stud chemical flange supplier Ahmedabad. Grade 8.8 double ended stud M10 to M72 supplier India. Grade 10.9 double end stud bulk supply EPC India. Yellow zinc double ended stud B7 ASME B16.5 supplier India. Teflon blue coated double ended stud SS316 anti-galling India. ASME B16.5 stud bolt supplier Ahmedabad Gujarat India. Stud bolt with heavy hex nut B7 2H set supplier India. Double ended stud metric M10 M16 M20 M24 M30 M36 M48 M64 M72 India. Double ended stud inch half inch to 3 inch ASME supplier India. Stud bolt Class 150 Class 300 Class 600 supplier India EPC. Applications in Indian Industries ASME B16.5 pipe flange bolting — Class 150, 300, 600, 900, 1500, 2500 ASME B16.47 large diameter flange bolting — Series A and B Pressure vessel nozzle and manway flange bolting Heat exchanger channel and shell flange connections Pump casing and suction / discharge flange bolting Compressor body and piping flange connections Valve body bonnet bolting — gate, globe, ball, check valves Reactor vessel flange connections — chemical and petrochemical Steam boiler and superheater flange joints (B16 grade) LNG and cryogenic process piping flange joints (L7 grade) Sour gas and H2S service pipeline flanges (B7M — NACE) Pharmaceutical plant SS316 piping flange joints (B8M, A4-70) EPC piping BOM fastener supply — all grades and classes EPC Contractors — Bulk Double Ended Stud Supply Double Ended Studs are a high-volume line item in every EPC piping BOM — typically hundreds to thousands of sets per project across multiple grades, sizes, and flange classes. Krishna Industries supplies complete EPC fastener packages: BOM-based bulk supply — share piping BOM for consolidated multi-grade quotation Stud bolt and nut sets — matched A193 stud A194 nut supplied together Multiple grades in single order — B7, B8M, L7, NACE grades together MTC for all ASTM A193 grades — chemical composition and mechanical properties NACE compliance certificate for B7M and L7M grades Hardness test report for sour service grades on request GST invoices — GSTIN: 24AKLPP6499B1ZT E-way bill and delivery challan for PAN India transport Fast dispatch from Ahmedabad — standard grades 2 to 5 working days As a multi-product supplier, Krishna Industries consolidates Double Ended Studs with Full Threaded 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 material procurement. Purchase Managers and MRO Buyers MOQ 10 Nos per line item — accessible for maintenance replacement quantities Stud bolt and nut sets available — eliminates separate sourcing of nuts Exact spec matching — grade, coating, size, thread, flange class confirmed before supply MTC provided for ASTM grades — required for plant maintenance QC records Consistent batch quality from verified manufacturers Fast repeat order processing — share previous PO details for quickest turnaround Complete GST invoice 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, Alwar 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. IEC registered exporter — IEC: AKLPP6499B. Quality and Documentation Material Test Certificate (MTC) — ASTM A193 all grades, chemical mechanical properties NACE compliance certificate for B7M and L7M on request Hardness test certificate for sour service grades Dimensional inspection records on request GST invoice — GSTIN: 24AKLPP6499B1ZT Industrial packaging — grade, size, coating, heat number clearly marked E-way bill and delivery challan for PAN India transport Related Products from Krishna Industries (KELOR) Full Threaded Stud — 100% full-length threaded rod for non-ASME and custom length applications Heavy Hex Nut — A194 2H / 8M matched nut sets for double ended studs Pipe Flange — Slip-on, Weld Neck, Blind — complete flange joint supply Pipe Fitting — Elbow, Tee, Reducer, Cap — consolidated order with fasteners Wafer Check Valve — pipeline backflow prevention Butterfly Valve PN10 / PN16 — pipeline isolation valves All available from Krishna Industries — single GST invoice, consolidated PAN India dispatch. Frequently Asked Questions 1. What is a double ended stud? A double ended stud — also called a stud bolt — has threads at both ends with a plain (unthreaded) shank in the middle. It is the standard fastener for ASME B16.5 and B16.47 pipe flange joints. One end engages into the flange or equipment, a nut is torqued on the opposite end to clamp the joint. 2. What is the difference between a double ended stud and a full threaded stud? Double ended stud has a plain shank in the middle — threads only at both ends — ASME B16.5 standard for pipe flange bolting. Full threaded stud is threaded 100% along its entire length — used for non-ASME flanges, structural connections, and custom cut-to-length applications. Using full threaded stud on a pressure flange joint is a quality non-conformance in most Indian EPC project specifications. 3. Which is the most commonly used grade in Indian EPC projects? ASTM A193 B7 with A194 2H heavy hex nut — this is the standard specification for carbon steel pipe flanges (Class 150 to Class 2500) across the vast majority of Indian EPC piping projects in oil and gas, petrochemical, power, and chemical industries. 4. Which grade for sour gas / H2S service? B7M with A194 2HM nut — NACE MR0175 / ISO 15156 compliant. Always specify NACE compliance explicitly when ordering for sour service. Krishna Industries supplies with NACE compliance certificate on request. 5. Can I get stud bolt and nut as a set? Yes — matched stud bolt and nut sets supplied together. Specify grade, size, and whether you need studs only or complete bolt-nut sets. 6. What coating for Indian EPC pipe flange projects? Yellow Zinc (yellow passivate) is the standard in Indian EPC piping projects — specified in most Indian project material requisitions and piping BOMs for B7 grade stud bolts. 7. What coating for SS stud bolts? Teflon Blue (PTFE coated) reduces galling on SS threads, controls torque coefficient, and adds chemical resistance. Standard for B8M and A4-70 stud bolts in chemical and pharmaceutical flange joints. 8. What metric sizes are available? M10 to M72 covering all standard ASME and non-ASME flange sizes used in Indian process industries. 9. What inch sizes are available? ½” to 3″ covering ASME B16.5 and B16.47 flange bolting requirements from small bore to large bore piping. 10. Do you provide NACE compliance certificate? Yes — NACE MR0175 / ISO 15156 compliance certificate available for B7M and L7M grades on request. 11. What is the MOQ? MOQ is 10 Nos per line item. EPC BOM-based bulk orders welcome with project-rate pricing for larger quantities. 12. Can I order stud bolts with flanges and valves in one consolidated order? Yes — Krishna Industries supplies double ended studs, full threaded studs, hex nuts, pipe flanges, pipe fittings, and valves in consolidated single orders — single GST invoice, single dispatch. Share your complete project BOM for one consolidated quotation. Conclusion The Double Ended Stud supplied by Krishna Industries (KELOR) is the standard ASME B16.5 flange bolting 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. Sourced from verified Indian manufacturers with MTC, NACE compliance certificates, and GST documentation. Fast PAN India dispatch from Ahmedabad. For EPC contractors, piping purchase managers, MRO teams, and bulk fastener buyers — contact Krishna Industries (KELOR), your trusted Double Ended Stud and Stud Bolt supplier in Ahmedabad, Gujarat, India. Share your piping BOM or size-grade list for bulk pricing within 24 hours.