Repsol Steel LLP is a trusted stud bolt supplier for buyers across the USA, Europe, Africa, Mexico, and Oman. We supply a comprehensive range of stud bolts — including SS316, SS304, ASTM A193 B7, B7M, B16, ASTM A320 L7, and L7M double-end stud bolts with matching 2H and 2HM nuts — engineered for leak-free sealing in high-pressure and high-temperature flanged joints across Oil & Gas, petrochemical, refinery, power generation, and chemical processing applications.
With over 25 years of combined industry experience and a proven export network, we serve EPC contractors, procurement teams, maintenance engineers, and fabrication units worldwide. Every stud bolt we supply complies with ASTM A193, ASTM A194, ASTM A320, ASME B18.31.2, and ASME B18.2.2 standards, with full material traceability, mechanical test reports, and documentation that meets the requirements of projects in the USA, Europe, Africa, Mexico, and Oman.
Whether you require standard SS316 stud bolts with 2H nuts for a petrochemical plant in Europe, B7 stud bolts with 2H nuts for a refinery in the USA, or B7M stud bolts for a sour service application in Africa or Oman — Repsol Steel LLP delivers the right stud bolt solution, on time, with complete export documentation.
A complete stud bolt portfolio covering SS316, SS304, B7, B7M, B16, L7, and L7M double-end stud bolts with matching 2H and 2HM nuts — engineered for high-pressure and high-temperature flanged joints across global markets.
The most widely specified stud bolts for corrosive and high-temperature service. SS316 stud bolts provide superior corrosion resistance to chlorides and marine environments.
Compliance: ASME B18.31.2, ASTM A193
Nut Pairing: SS316 Hex Nuts
Size Range: ½" to 4"
The most widely specified alloy steel stud bolts for high-pressure and high-temperature flanged joints. B7 stud bolts are used in refinery, petrochemical, and power generation applications.
Compliance: ASTM A193 B7, ASME B18.31.2
Nut Pairing: ASTM A194 2H
Size Range: ½" to 4"
NACE-compliant B7 stud bolts for sour service (H2S) applications. B7M stud bolts are specified where resistance to sulfide stress cracking is required per NACE MR0175 / ISO 15156.
Compliance: ASTM A193 B7M, NACE MR0175
Nut Pairing: ASTM A194 2HM
Size Range: ½" to 4"
High-temperature creep-resistant alloy steel stud bolts for elevated service conditions. B16 stud bolts are used in high-temperature refinery, turbine, and power generation applications.
Compliance: ASTM A193 B16
Nut Pairing: ASTM A194 4 or 7
Size Range: ½" to 4"
Low-temperature alloy steel stud bolts for cryogenic and cold service down to -101°C. L7 stud bolts are used in LNG, low-temperature process, and cold storage applications.
Compliance: ASTM A320 L7, L7M
Nut Pairing: ASTM A194 2H or 2HM
Size Range: ½" to 4"
Cost-effective SS304 stud bolts for general industrial service, plus custom stud bolts in exotic alloys (Monel, Inconel, Hastelloy, Duplex) for highly corrosive applications.
Compliance: ASME B18.31.2
Nut Pairing: SS304 or matched exotic alloy
Size Range: ½" to 4"
Stud bolts are supplied in different materials and grades to suit specific pressure, temperature, and media conditions. The material grade determines the mechanical strength, corrosion resistance, and temperature capability of the stud bolt. We supply stud bolts in the following materials and grades:
All stud bolts we supply are accompanied by Material Test Certificates (MTC) and mechanical test reports confirming the exact grade, mechanical properties, and heat number — ensuring full traceability and compliance with international project specifications. NACE compliance documentation is available for B7M and L7M stud bolts.
| Parameter | Specification |
|---|---|
| Stud Bolt Types | Double-End Stud Bolts (Full Thread), Double-End Stud Bolts (Partial Thread), Tap-End Stud Bolts |
| Materials | Stainless Steel (SS304, SS316, SS321), Alloy Steel (B7, B7M, B16, L7, L7M), Exotic Alloys (Monel, Inconel, Hastelloy, Duplex) |
| Stud Bolt Grades | ASTM A193 B7, B7M, B16; ASTM A320 L7, L7M; SS304, SS316, SS321 |
| Nut Pairing | ASTM A194 2H, 2HM, 4, 7, 8, 8M; SS304, SS316 |
| Size Range (Imperial) | ½" to 4" standard; larger sizes available on request |
| Size Range (Metric) | M12 to M100 standard; larger sizes available on request |
| Length Range | Custom lengths available per project specifications |
| Thread Types | UNC, UNF, BSW, Metric (M) — per ASME B1.1 and ISO 261 |
| Coatings | Plain, Zinc Plated, Hot-Dip Galvanized, Xylan, PTFE, Cadmium, Dacromet, Geomet |
| Standards Compliance | ASTM A193, ASTM A194, ASTM A320, ASME B18.31.2, ASME B18.2.2, NACE MR0175 |
| Export Documentation | Commercial Invoice, Packing List, Bill of Lading, Certificate of Origin, MTC (EN 10204 3.1) |
| Inspection Options | Third-party inspection (SGS, BV, TUV, Intertek) available on request |
Correct stud bolt selection is critical to ensuring a leak-free flanged joint and long-term operational safety. The stud bolt grade, nut grade, and coating must be matched to the operating pressure, temperature, and media. Our technical team recommends evaluating four key factors before finalizing a stud bolt:
If you are unsure which stud bolt specification best suits your application, our technical team is available to review your flange drawings, process data, and project specifications — and recommend the most suitable stud bolt solution.
We specialize in stud bolt supply — offering SS316, SS304, B7, B7M, B16, L7, and L7M double-end stud bolts with matching 2H, 2HM, 4, 7, 8, and 8M nuts. Every stud bolt is manufactured to ASTM and ASME standards.
We supply stud bolts in all major grades — ASTM A193 B7, B7M, B16; ASTM A320 L7, L7M; and SS304, SS316, SS321 — from ½" to 4" as standard, with larger sizes and custom configurations on request.
Every stud bolt batch is backed by Material Test Certificates (MTC) and mechanical test reports, and can be supplied with NACE compliance documentation, dimensional inspection reports, and third-party certification on request.
Non-standard sizes, grades, lengths, and stud bolt configurations are manufactured according to flange drawings, equipment specifications, and project requirements — with quick turnaround times.
We supply stud bolts to clients in the USA, Europe, Africa, Mexico, and Oman — with packaging, documentation, and compliance structured for international procurement.
Our experienced technical team assists with stud bolt selection, bolt and nut grade matching, and installation guidance. Post-supply support includes documentation follow-up and replacement coordination.
Repsol Steel LLP supplies stud bolts to a wide range of process industries across USA, Europe, Africa, Mexico, and Oman — where reliable high-pressure bolting performance is essential.
Stud bolts supplied for wellhead equipment, Christmas trees, pipeline flanges, and high-pressure process piping in upstream, midstream, and downstream operations.
Stud bolts supplied for reactors, heat exchangers, process piping, and storage systems handling hydrocarbons at high pressures and temperatures.
B7 and B16 stud bolts supplied for high-temperature and high-pressure flanged joints in crude distillation, catalytic cracking, and hydroprocessing units.
High-temperature B16 and B7 stud bolts supplied for boilers, steam systems, turbine connections, and high-pressure auxiliary piping in thermal and nuclear power plants.
B7M and L7M stud bolts supplied with 2HM nuts for NACE-compliant sour service applications per NACE MR0175 / ISO 15156.
Exotic alloy stud bolts supplied for subsea wellhead equipment, manifolds, and flowlines per API 17D — with Monel and Inconel for seawater and high-pressure service.
Repsol Steel LLP is recognized as a reliable stud bolt supplier for international procurement teams, EPC contractors, and maintenance projects. Our export documentation, packaging, and standard compliance are structured for smooth cross-border supply to buyers in the USA, Europe, Africa, Mexico, and Oman — ensuring your stud bolts arrive on time, in specification, and ready for installation.
USA: Stud bolt supply for Oil & Gas, petrochemical & refinery projects
Europe: Stud bolts for chemical, refinery & process industries
Africa: Stud bolts for refinery, petrochemical & subsea projects
Mexico: Stud bolt supply for chemical plants & refinery operations
Oman: Stud bolts for Oil & Gas, petrochemical & power projects
All stud bolts are supplied with material certificates, mechanical test reports, NACE compliance documentation (for B7M and L7M), and third-party certification as required by project specifications.
A stud bolt is a threaded rod with threads on both ends (double-end stud) or threads on one end (tap-end stud). Stud bolts are used in flanged joints with through-holes, where they are inserted through the flange holes and secured with nuts on both sides.
We supply stud bolts in ASTM A193 B7, B7M, B16; ASTM A320 L7, L7M; and SS304, SS316, SS321 grades. Exotic alloys including Monel, Inconel, Hastelloy, and Duplex are also available. Nut pairing includes ASTM A194 2H, 2HM, 4, 7, 8, and 8M grades.
A hex bolt has a hexagonal head and is tightened from one side, while a stud bolt has no head and is threaded on both ends, requiring nuts on both sides. Stud bolts are preferred for flanged joints with through-holes because they provide better load distribution and are easier to install in tight spaces.
We supply stud bolts primarily to the USA, Europe, Africa, Mexico, and Oman, serving Oil & Gas, petrochemical, subsea, refinery, power, and chemical processing projects in these regions.
Yes. We offer custom sizes, grades, lengths, and stud bolt configurations based on drawings, equipment specifications, and project requirements — with quick turnaround times for export orders.
Send us your stud bolt specifications, grade requirements, or flange drawings. Our export team will respond within 24 hours with a tailored quotation.
Repsol Steel LLP is a leading manufacturer and stockholder of high-quality piping products, serving the Oil, Gas, Petrochemical, and Nuclear industries with reliable engineering solutions.
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