Repsol Steel LLP is a trusted stainless steel nuts supplier for buyers across the USA, Europe, Africa, Mexico, and Oman. We supply a comprehensive range of stainless steel nuts — including SS304, SS316, SS321, and Duplex hex nuts, lock nuts, heavy hex nuts, and nylon insert nuts — engineered for corrosion resistance and reliable bolting performance across Oil & Gas, petrochemical, refinery, structural, 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 stainless steel nut we supply complies with ASTM A194, ASME B18.2.2, ASME B18.16.6, and ISO 898-2 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 hex nuts for a petrochemical plant in Europe, SS304 lock nuts for a structural project in the USA, or SS321 heavy hex nuts for a refinery in Africa or Oman — Repsol Steel LLP delivers the right stainless steel nut solution, on time, with complete export documentation.
A complete stainless steel nuts portfolio covering SS304, SS316, SS321, SS347, and Duplex hex nuts, lock nuts, heavy hex nuts, and nylon insert nuts — engineered for corrosion resistance and reliable bolting performance across global markets.
The most widely specified stainless steel nuts for corrosive and high-temperature service. SS316 hex nuts provide superior corrosion resistance to chlorides and marine environments.
Compliance: ASME B18.2.2, ASTM A194
Applications: Petrochemical, refinery, chemical processing
Size Range: ½" to 4"
Cost-effective stainless steel nuts for general industrial applications. SS304 hex nuts provide good corrosion resistance and reliable performance in moderate service conditions.
Compliance: ASME B18.2.2
Applications: General industry, utilities, process piping
Size Range: ½" to 4"
High-temperature stainless steel nuts for elevated service conditions. SS321 hex nuts provide superior thermal stability and oxidation resistance at high temperatures.
Compliance: ASTM A194
Applications: Refinery, power generation, high-temperature piping
Size Range: ½" to 4"
Stainless steel lock nuts and nylon insert nuts for vibration-resistant fastening. Available in SS304 and SS316 for industrial and structural applications.
Compliance: ASME B18.16.6, DIN 985
Materials: SS304, SS316
Size Range: ½" to 4"
Stainless steel heavy hex nuts for high-strength structural and flanged joint applications. Larger head and body than standard hex nuts for higher load capacity.
Compliance: ASME B18.2.2
Materials: SS304, SS316
Size Range: ½" to 4"
High-strength stainless steel nuts for highly corrosive and high-pressure service. Duplex nuts offer superior resistance to stress corrosion cracking.
Compliance: ASTM A182, NORSOK
Applications: Subsea, offshore, chemical processing
Size Range: ½" to 4"
Stainless steel nuts are supplied in different grades to suit specific pressure, temperature, and media conditions. The grade of stainless steel determines the corrosion resistance, mechanical strength, and temperature capability of the nut. We supply stainless steel nuts in the following grades:
All stainless steel nuts we supply are accompanied by Material Test Certificates (MTC) confirming the exact grade, mechanical properties, and heat number — ensuring full traceability and compliance with international project specifications.
| Parameter | Specification |
|---|---|
| Nut Types | Hex Nuts, Heavy Hex Nuts, Lock Nuts, Nylon Insert Nuts, Custom Nuts |
| Stainless Steel Grades | SS304/304L, SS316/316L, SS321, SS347, SS904L, Duplex 2205, Super Duplex 2507 |
| Size Range (Imperial) | ¼" to 4" standard; larger sizes available on request |
| Size Range (Metric) | M6 to M100 standard; larger sizes available on request |
| Thread Types | UNC, UNF, BSW, Metric (M) — per ASME B1.1 and ISO 261 |
| Surface Finish | Plain, Passivated (stainless steel nuts typically supplied plain or passivated) |
| Standards Compliance | ASTM A194, ASME B18.2.2, ASME B18.16.6, ISO 898-2, DIN 934, DIN 985 |
| 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 compliance, H2S service documentation available on request |
Correct stainless steel nut selection is critical to ensuring a leak-free flanged joint, reliable structural connection, and long-term operational safety. The grade, nut type, and thread must be matched to the operating pressure, temperature, and application. Our technical team recommends evaluating four key factors before finalizing a stainless steel nut:
If you are unsure which stainless steel nut specification best suits your application, our technical team is available to review your flange drawings, bolt specifications, and project requirements — and recommend the most suitable stainless steel nut solution.
We specialize in stainless steel nut supply — offering SS304, SS316, SS321, SS347, SS904L, Duplex, and Super Duplex hex nuts, heavy hex nuts, lock nuts, and nylon insert nuts. All nuts are manufactured to ASTM and ASME standards.
We supply stainless steel nuts in all major grades — SS304/304L, SS316/316L, SS321, SS347, SS904L, Duplex 2205, and Super Duplex 2507 — from ¼" to 4" (M6 to M100) as standard, with larger sizes on request.
Every stainless steel nut batch is backed by Material Test Certificates (MTC to EN 10204 3.1) confirming the exact grade, and can be supplied with mechanical test reports, dimensional inspection reports, and third-party certification on request.
Non-standard sizes, grades, and stainless steel nut configurations are manufactured according to drawings, equipment specifications, and project requirements — with quick turnaround times.
We supply stainless steel nuts 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 stainless steel grade selection, nut type recommendations, and installation guidance. Post-supply support includes documentation follow-up and replacement coordination.
Repsol Steel LLP supplies stainless steel nuts to a wide range of process industries across USA, Europe, Africa, Mexico, and Oman — where corrosion resistance and high-temperature bolting performance are essential.
Stainless steel nuts supplied for wellhead equipment, Christmas trees, pipeline flanges, and high-pressure process piping in upstream, midstream, and downstream operations.
Bolting solutions supplied for reactors, heat exchangers, process piping, and storage systems handling hydrocarbons at high pressures and temperatures.
SS316 heavy hex nuts and lock nuts supplied for steel-to-steel connections, foundation anchorage, and structural assemblies.
High-temperature stainless steel nuts supplied for boilers, steam systems, turbine connections, and high-pressure auxiliary piping in thermal and nuclear power plants.
SS316 and SS904L nuts supplied for aggressive chemical and corrosive media applications in reactors, storage tanks, and process equipment.
Duplex and Super Duplex nuts supplied for subsea wellhead equipment, manifolds, and flowlines per API 17D — with superior resistance to seawater and chloride stress corrosion.
Repsol Steel LLP is recognized as a reliable stainless steel nuts 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 stainless steel nuts arrive on time, in specification, and ready for installation.
USA: Stainless steel nut supply for Oil & Gas, petrochemical & structural projects
Europe: Stainless steel nuts for chemical, refinery & process industries
Africa: Stainless steel nuts for refinery, petrochemical & subsea projects
Mexico: Stainless steel nut supply for chemical plants & refinery operations
Oman: Stainless steel nuts for Oil & Gas, petrochemical & power projects
All stainless steel nuts are supplied with Material Test Certificates (MTC to EN 10204 3.1), mechanical test reports, and third-party certification as required by project specifications.
Stainless steel nuts are threaded fasteners manufactured from stainless steel grades such as SS304, SS316, SS321, SS347, and SS904L. They are used with bolts and studs for corrosion resistance and high-temperature bolting in flanged joints, structural connections, and industrial applications.
We supply stainless steel nuts in SS304/304L, SS316/316L, SS321, SS347, SS904L, Duplex 2205, and Super Duplex 2507 grades — selected based on operating pressure, temperature, and media compatibility.
We supply stainless steel hex nuts, heavy hex nuts, lock nuts, nylon insert nuts, and custom nuts — in various grades, sizes, and thread types per project specifications.
We supply stainless steel nuts primarily to the USA, Europe, Africa, Mexico, and Oman, serving Oil & Gas, petrochemical, subsea, refinery, power, structural, and chemical processing projects in these regions.
Yes. We offer custom sizes, grades, lengths, and stainless steel nut configurations based on drawings, equipment specifications, and project requirements — with quick turnaround times for export orders.
Send us your nut specifications, grade 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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