Repsol Steel LLP is a trusted oil and gas fasteners supplier for buyers across the USA, Europe, Africa, Mexico, and Oman. We supply a comprehensive range of fasteners for the Oil & Gas industry — including ASTM A193 B7, B7M, B16, ASTM A320 L7, L7M bolts and stud bolts, ASTM A194 2H, 2HM, 4, 7 nuts, and hardened washers — engineered for leak-free sealing and reliable bolting performance in upstream, midstream, and downstream applications.
With over 25 years of combined industry experience and a proven export network, we serve EPC contractors, oilfield service companies, procurement teams, and maintenance engineers worldwide. Every oil and gas fastener we supply complies with ASTM A193, ASTM A194, ASTM A320, ASME B18.2.1, ASME B18.31.2, API 6A, API 17D, and NACE MR0175 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 B7 stud bolts with 2H nuts for a wellhead application in the USA, B7M fasteners with 2HM nuts for a sour service refinery in Europe, or L7M fasteners for a low-temperature LNG project in Africa or Oman — Repsol Steel LLP delivers the right oil and gas fastening solution, on time, with complete export documentation.
A complete oil and gas fasteners portfolio covering B7, B7M, B16, L7, L7M bolts and stud bolts with 2H, 2HM, 4, 7, 8, 8M nuts and hardened washers — engineered for upstream, midstream, downstream, and subsea applications across global markets.
The most widely specified alloy steel fasteners for high-pressure and high-temperature Oil & Gas flanged joints. B7 bolts and stud bolts are used in wellhead, pipeline, and refinery applications with 2H nuts.
Compliance: ASTM A193 B7, ASME B18.31.2
Nut Pairing: ASTM A194 2H
Size Range: ½" to 4"
NACE-compliant B7M fasteners for sour service (H2S) applications per NACE MR0175 / ISO 15156. B7M fasteners are used where resistance to sulfide stress cracking is required in oil and gas operations.
Compliance: ASTM A193 B7M, NACE MR0175
Nut Pairing: ASTM A194 2HM
Size Range: ½" to 4"
High-temperature creep-resistant alloy steel fasteners for elevated service conditions. B16 fasteners are used in high-temperature refinery, turbine, and power generation applications with 4 or 7 nuts.
Compliance: ASTM A193 B16
Nut Pairing: ASTM A194 4 or 7
Size Range: ½" to 4"
Low-temperature alloy steel fasteners for cryogenic and cold service down to -101°C. L7 and L7M fasteners 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"
Corrosion-resistant stainless steel fasteners for petrochemical, refinery, and offshore applications. SS316 fasteners provide superior resistance to chlorides and marine environments.
Compliance: ASTM A193, ASME B18.2.1
Nut Pairing: SS316 Hex Nuts
Size Range: ½" to 4"
Exotic alloy fasteners (Monel, Inconel, Hastelloy, Duplex) for highly corrosive, high-temperature, or subsea applications where standard materials are not suitable.
Compliance: ASTM B164, ASTM A453, NORSOK
Applications: Subsea, sour service, high-corrosion
Size Range: ½" to 4"
The Oil & Gas industry is divided into three major segments — upstream, midstream, and downstream — plus subsea & offshore operations. Each segment has specific bolting requirements based on operating pressure, temperature, and media. Repsol Steel LLP supplies fasteners across all segments with material and certification support tailored to each application.
All oil and gas fasteners we supply are accompanied by Material Test Certificates (MTC) and mechanical test reports, with NACE compliance documentation, hardness test reports, and third-party inspection available on request.
| Parameter | Specification |
|---|---|
| Fastener Types | Hex Bolts, Stud Bolts, Hex Nuts, Heavy Hex Nuts, Washers, Custom Fasteners |
| Materials | Alloy Steel (B7, B7M, B16, L7, L7M), Stainless Steel (SS304, SS316, SS321), Exotic Alloys (Monel, Inconel, Hastelloy, Duplex) |
| Bolt Grades | ASTM A193 B7, B7M, B16; ASTM A320 L7, L7M; SS304, SS316, SS321 |
| Nut Grades | 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 |
| 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, A194, A320; ASME B18.2.1, B18.2.2, B18.31.2; API 6A, API 16A, API 17D; NACE MR0175; NORSOK |
| 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 |
| Additional Documentation | Hardness test reports, NACE MR0175 compliance, H2S service documentation available on request |
Correct oil and gas fastener selection is critical to ensuring a leak-free flanged joint and long-term operational safety. The bolt grade, nut grade, material, and coating must be matched to the operating pressure, temperature, and media. Our technical team recommends evaluating four key factors before finalizing an oil and gas fastener:
If you are unsure which oil and gas fastener 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 oil and gas fastening solution.
We specialize in Oil & Gas fastener supply — offering ASTM A193 B7, B7M, B16, ASTM A320 L7, L7M, SS316, and exotic alloy bolts and stud bolts with matched nuts and washers. All fasteners are manufactured to ASTM, ASME, API, and NACE standards.
We supply NACE MR0175 / ISO 15156 compliant B7M and L7M fasteners with 2HM nuts for sour service (H2S) applications. NACE compliance documentation and hardness test reports are provided as standard.
Every oil and gas fastener 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 oil and gas fastener configurations are manufactured according to drawings, equipment specifications, and project requirements — with quick turnaround times for critical Oil & Gas projects.
We supply oil and gas fasteners to clients in the USA, Europe, Africa, Mexico, and Oman — with packaging, documentation, and compliance structured for international Oil & Gas procurement.
Our experienced technical team assists with oil and gas fastener selection, material and grade recommendations, and installation guidance. Post-supply support includes documentation follow-up and replacement coordination.
Repsol Steel LLP supplies oil and gas fasteners across upstream, midstream, downstream, and subsea segments — with materials and certifications tailored to each application.
B7 and B7M fasteners supplied for wellhead equipment, Christmas trees, blowout preventers (BOPs), drilling rigs, and production manifolds. Compliant with API 6A and API 16A.
B7M, L7M, and exotic alloy fasteners supplied for subsea wellhead equipment, manifolds, and flowlines per API 17D — with NACE MR0175 compliance for sour service.
B7 and L7/L7M fasteners supplied for transmission pipelines, compressor stations, metering stations, storage terminals, and LNG facilities.
B7, B16, and SS316 fasteners supplied for oil refineries, petrochemical plants, and gas processing units — for high-temperature and corrosive service.
NACE MR0175 compliant B7M and L7M fasteners with 2HM nuts supplied for sour service applications — with NACE compliance documentation and hardness test reports.
B7M, L7M, and exotic alloy fasteners supplied for FPSOs, FSOs, and offshore marine vessels — with materials and certifications per project specifications.
Repsol Steel LLP is recognized as a reliable oil and gas fasteners supplier for international procurement teams, EPC contractors, oilfield service companies, 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 oil and gas fasteners arrive on time, in specification, and ready for installation.
USA: Oil & Gas fastener supply for upstream, midstream & downstream projects
Europe: Oil & Gas fasteners for refinery, petrochemical & North Sea projects
Africa: Oil & Gas fasteners for upstream, refinery & subsea projects
Mexico: Oil & Gas fastener supply for onshore & offshore operations
Oman: Oil & Gas fasteners for upstream, petrochemical & LNG projects
All oil and gas fasteners are supplied with material certificates, hardness test reports, NACE MR0175 compliance documentation (for sour service), and third-party certification as required by project specifications.
Oil and gas fasteners are bolts, stud bolts, nuts, and washers specifically manufactured for use in upstream, midstream, downstream, and subsea Oil & Gas applications. They comply with ASTM, ASME, API, and NACE standards to meet the demanding pressure, temperature, and media conditions of the industry.
We supply ASTM A193 B7, B7M, B16; ASTM A320 L7, L7M; SS304, SS316, SS321; and exotic alloys (Monel, Inconel, Hastelloy, Duplex). Nut pairing includes ASTM A194 2H, 2HM, 4, 7, 8, and 8M grades.
Yes. We supply NACE MR0175 / ISO 15156 compliant B7M and L7M fasteners with 2HM nuts for sour service (H2S) applications. NACE compliance documentation and hardness test reports are provided as standard.
We supply oil and gas fasteners primarily to the USA, Europe, Africa, Mexico, and Oman, serving upstream, midstream, downstream, and subsea Oil & Gas projects in these regions.
Yes. We offer custom sizes, grades, lengths, and oil and gas fastener configurations based on drawings, equipment specifications, and project requirements — with quick turnaround times for critical Oil & Gas projects.
Send us your fastener specifications, segment requirements, or 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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