ASTM A194/A194M – Carbon, Alloy & Stainless Steel Nuts for High-Pressure/High-Temperature Service
Dipti Metal Industries ASTM A194 manufactures and ASTM A194 exports heavy hex and hex nuts per ASTM A194/A194M in carbon steel, alloy steel, martensitic stainless, and austenitic stainless grades for high-pressure and/or high-temperature applications. We supply global projects directly from Mumbai stock and quick mill runs with full traceability.
Company Introduction
Dipti Metal Industries is a long-established ASTM A194 manufacturer, ASTM A194 exporter, ASTM A194 supplier, ASTM A194 stockiest, ASTM A194 wholesaler & ASTM A194 distributor of industrial fasteners from Mumbai, India. We specialize in ASTM A194/A194M heavy hex & hex nuts across carbon, alloy and stainless steel grades with full heat & lot traceability.
- EN 10204 3.1/3.2 MTCs, TPI/NDE as specified
- Rapid mill runs + stocked sizes (inch & metric)
- Seaworthy export packing, line-wise tagging, global air/ocean/courier
Why Dipti?
- Project-ready kits: studs + nuts + washers matched to spec
- QA discipline: proof-load, hardness, PMI (stainless)
- Global reach: 190+ countries served with fast documents
Scope & ASTM A194 Supply Range
| Product | Details |
|---|---|
| Heavy Hex Nuts (inch) | 1/4″ to 4″; UNC / 8UN per ASME B18.2.2 |
| Metric Heavy Hex Nuts | M6 to M100; coarse thread 6H per ASME B18.2.4.6M |
| Finishes | As-machined, oiled, passivated (stainless); coatings on request* |
| Docs | EN 10204 3.1/3.2 MTCs, chemistry, hardness, proof-load |
*Coatings (e.g., zinc, cadmium) only when specified; temperature limits and embrittlement control apply.
Typical Uses
- Refinery, petrochem, power & steam systems
- High-temperature flanged joints & pressure vessels
- Pipeline valves, fittings & OEM skids
Grades We Manufacture & Stock
Carbon & Alloy Steel (Heat Treated)
| Grade | Typical Service | Notes |
|---|---|---|
| 2H | High temp / pressure | Quenched & tempered; heavy hex preferred |
| 2HM | Enhanced control | Heat treatment + 100% hardness evaluation per project |
| 7 | High strength | Alloy steel; pairs with A320 L7 studs |
| 7M | Controlled hardness | For pairing with A320 L7M studs |
| 4 | Cr-Mo | Elevated temperature capability |
| 16 | Cr-Mo-V | High temperature service |
Stainless Steel (Martensitic & Austenitic)
| Grade | UNS/Type | Notes |
|---|---|---|
| 6 / 6F | 410 / 416 | Heat treated; 6F is free-machining variant |
| 8 / 8A | 304 (S30400) | Solution treated; “A” types are carbide-solution treated |
| 8C / 8CA | 347 (S34700) | Nb-stabilized; low sensitization risk |
| 8M / 8MA | 316 (S31600) | Mo bearing for chloride resistance |
| 8T / 8TA | 321 (S32100) | Ti-stabilized |
| 8LN / 8LNA, 8MLN / 8MLNA | 304LN / 316LN | N-alloyed for strength |
| 8R / 8RA | XM-19 (S20910) | High strength, corrosion resistant |
| 9C / 9CA | N08367 (AL-6XN) | Super austenitic; Mo & Ni rich |
“A” suffix grades indicate carbide-solution treatment. Strain-hardened options available when specified.
Quality, Heat Treatment & Testing
- Heat treatment per grade (quench & temper / solution treat)
- Proof-load testing (threaded mandrel/bolt) per project scope
- Hardness testing (lot-based; 100% for 2HM/7M when required)
- Marking: grade symbols on nut face; heat & lot traceability
- Dimensions: Heavy Hex by ASME B18.2.2 / B18.2.4.6M
- Threads: UNC / 8UN / Metric coarse; Class 2B or 6H fit
- Coatings on request with embrittlement control (zinc/cadmium, etc.)
- Optional low-temperature impact testing for Grade 4/7/7M when specified
All limits and test quantities are applied as per the latest applicable standard and your PO/QCP. We help map your datasheet to the correct grade, series and test plan.
Nut–Stud Pairing Guidance
| Bolt/Stud Standard | Typical Nut Grade (A194) |
|---|---|
| ASTM A320 L7 | Grade 7 |
| ASTM A320 L7M | Grade 7M |
| High-temp alloy studs (A193 B7/B16 etc.) | 2H / 4 / 16 (per service) |
| Stainless studs (A193 B8/B8M etc.) | 8 / 8M / 8C / 8T family |
We deliver complete kits (studs + nuts + washers) matched by material and class, with line-wise tagging and flange mapping. Ask for packing lists grouped by line numbers and MTO item codes.
🌍 Global Export Coverage
We export to 190+ countries.
View full country list
Africa
Algeria,
Angola,
Benin,
Botswana,
Burkina Faso,
Burundi,
Cabo Verde,
Cameroon,
Central African Republic,
Chad,
Comoros,
Congo (Republic),
Congo (DRC),
Côte d’Ivoire,
Djibouti,
Egypt,
Equatorial Guinea,
Eritrea,
Eswatini,
Ethiopia,
Gabon,
Gambia,
Ghana,
Guinea,
Guinea-Bissau,
Kenya,
Lesotho,
Liberia,
Libya,
Madagascar,
Malawi,
Mali,
Mauritania,
Mauritius,
Morocco,
Mozambique,
Namibia,
Niger,
Nigeria,
Rwanda,
São Tomé & Príncipe,
Senegal,
Seychelles,
Sierra Leone,
Somalia,
South Africa,
South Sudan,
Sudan,
Tanzania,
Togo,
Tunisia,
Uganda,
Zambia,
Zimbabwe
Americas
Antigua & Barbuda,
Argentina,
Bahamas,
Barbados,
Belize,
Bolivia,
Brazil,
Canada,
Chile,
Colombia,
Costa Rica,
Cuba,
Dominica,
Dominican Republic,
Ecuador,
El Salvador,
Grenada,
Guatemala,
Guyana,
Haiti,
Honduras,
Jamaica,
Mexico,
Nicaragua,
Panama,
Paraguay,
Peru,
Saint Kitts & Nevis,
Saint Lucia,
Saint Vincent & the Grenadines,
Suriname,
Trinidad & Tobago,
United States,
Uruguay,
Venezuela
Asia
Afghanistan,
Armenia,
Azerbaijan,
Bahrain,
Bangladesh,
Bhutan,
Brunei,
Cambodia,
China,
Cyprus,
Georgia,
India,
Indonesia,
Iran,
Iraq,
Israel,
Japan,
Jordan,
Kazakhstan,
Kuwait,
Kyrgyzstan,
Laos,
Lebanon,
Malaysia,
Maldives,
Mongolia,
Myanmar,
Nepal,
North Korea,
Oman,
Philippines,
Qatar,
Saudi Arabia,
Singapore,
South Korea,
Sri Lanka,
Syria,
Tajikistan,
Thailand,
Timor-Leste,
Turkey,
Turkmenistan,
United Arab Emirates,
Uzbekistan,
Vietnam,
Yemen
Europe
Albania,
Andorra,
Austria,
Belarus,
Belgium,
Bosnia & Herzegovina,
Bulgaria,
Croatia,
Czechia,
Denmark,
Estonia,
Finland,
France,
Germany,
Greece,
Hungary,
Iceland,
Ireland,
Italy,
Kosovo,
✉️ Request a Quote — ASTM A194/A194M Nuts
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🔗 Related Standards & Matching Bolting
- ASTM A320/A320M Low-Temperature Bolting — pair with A194 Grade 7/7M for L7/L7M studs
- ASME B18.2.2 / B18.2.4.6M — heavy hex dimensions (inch / metric)
Always confirm the latest applicable revision of each standard in your PO.
Contact & Certifications
- EN 10204 3.1/3.2 MTCs with heat & lot traceability
- Proof-load, hardness, PMI (stainless), TPI/NDE on request
- Seaworthy export packing; line-wise bagging & tagging
All data is typical/general. Verify against the latest ASTM/ASME revisions and your purchase order before ordering.