ASTM A194 GR 7 Nuts, ASTM A194 GR 7 Heavy Hex Nuts, GR 7 Nuts & GR 7 Nut Manufacturer and Supplier in Mumbai, India
Unifit Metal Alloys is a manufacturer, supplier, stockist and exporter of ASTM A194 GR 7 Nuts in Mumbai, India, supplying alloy steel nuts for pressure vessels, piping systems, valves, flanges and industrial bolting assemblies. These nuts are selected for fastening connections that require dependable strength, secure tightening and stable performance under demanding operating conditions. We supply different sizes, thread configurations and surface finishes for standard and customized requirements.
ASTM A194 GR 7 Nuts are manufactured from suitable alloy steel and processed to achieve the mechanical properties required for high-strength pressure and mechanical bolting applications. Their sturdy construction enables them to withstand substantial tightening forces and service loads when paired with compatible bolts or studs. These nuts help maintain reliable clamping force and joint stability in demanding fastening assemblies.
ASTM A194 GR 7 Nuts, ASTM A194 GR 7 Heavy Hex Nuts, GR 7 Nuts & GR 7 Nut Bolting Manufacturer and Supplier in Mumbai, India
They are commonly used in oil and gas plants, refineries, petrochemical facilities, pressure vessels, power-generation equipment, process piping, valves, flanged connections and heavy engineering systems. Their strength and durability make them suitable for industrial joints where dependable fastening performance is essential.
ASTM A194 GR 7 Nuts are available in various dimensions, thread forms and surface finishes to accommodate different installation requirements. They can be supplied for fabrication, maintenance, equipment assembly and industrial projects requiring reliable alloy steel fastening components.
Get the Best Quote for ASTM A194 GR 7 Nuts. We Stock ASTM A194 GR 7 Nuts in Various Diameters, Thread Sizes, Specifications and Surface Finishes. Contact Us Today for a Competitive Quote.
ASTM A194 GR 7 Nuts Specification & Supply Parameters
| Parameter | Details |
|---|---|
| Specification | ASTM A194 / ASME SA194 Grade 7 (dual certified) |
| Material Grades | AISI 4140, 4142, 4145, 4140H, 4142H, 4145H |
| Dimension Standard (Inch) | ASME B18.2.2 (hex), ASME B18.2.2 (heavy hex) |
| Dimension Standard (Metric) | ASME B18.2.4.1M, ASME B18.2.4.2M |
| Thread Standard | ASME B1.1 (Unified Inch) / ASME B1.13M (Metric Coarse) |
| Size Range — Inch | ¼″ to 4″ (UNC/UNF) |
| Size Range — Metric | M6 to M100 |
| Heat Treatment | Quenched & Tempered — minimum tempering at 595°C (1100°F) |
| Hardness | 248–327 BHN / 24–35 HRC (completed nuts) |
| NACE Compliance | MR0175 / ISO 15156 (at ≤22 HRC / 238 BHN) |
| Additional Compliance | PED 97/23/EC; ASME BPVC; ISO 15156 |
| Marking | Hot/cold forged: “7”; Machined from bar: “7B” |
| Finish / Coating | Plain, Hot-Dip Galvanized (ASTM A153), Black Oxide, Xylan, PTFE, Zinc Nickel |
| Certification | EN 10204 Type 3.1 MTC; NABL-approved lab reports |
Chemical Composition for ASTM A194 GR 7 Nuts
| Element | Range | Product Variation (±) |
|---|---|---|
| Carbon (C) % | 0.37–0.49 | 0.02 |
| Manganese (Mn) % | 0.65–1.10 | 0.04 |
| Phosphorus (P) % max. | 0.035 | 0.005 over |
| Sulfur (S) % max. | 0.040 | 0.005 over |
| Silicon (Si) % | 0.15–0.35 | 0.02 |
| Chromium (Cr) % | 0.75–1.20 | 0.05 |
| Molybdenum (Mo) % | 0.15–0.25 | 0.02 |
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Dimension Chart of ASTM A194 GR 7 Nuts
| Nominal Size (in) | TPI (UNC) | Width Across Flats (in) | Width Across Corners (in) | Thickness (in) | Bearing Face Dia. (in) |
|---|---|---|---|---|---|
| ½″ | 13 | ⅞ | 1.010 | 31/64 | 0.902 |
| ⅝″ | 11 | 1-1/16 | 1.227 | 39/64 | 1.085 |
| ¾″ | 10 | 1-¼ | 1.443 | 47/64 | 1.269 |
| ⅞″ | 9 | 1-7/16 | 1.660 | 55/64 | 1.453 |
| 1″ | 8 | 1-⅝ | 1.876 | 63/64 | 1.638 |
| 1-⅛″ | 8 | 1-13/16 | 2.093 | 1-7/64 | 1.825 |
| 1-¼″ | 8 | 2 | 2.309 | 1-7/32 | 2.010 |
| 1-⅜″ | 8 | 2-3/16 | 2.526 | 1-11/32 | 2.197 |
| 1-½″ | 8 | 2-⅜ | 2.742 | 1-31/64 | 2.385 |
| 1-¾″ | 5 | 2-¾ | 3.175 | 1-43/64 | 2.760 |
| 2″ | 4.5 | 3-⅛ | 3.608 | 1-⅞ | 3.135 |
| 2-½″ | 4 | 3-⅞ | 4.474 | 2-5/16 | 3.885 |
| 3″ | 4 | 4-⅝ | 5.341 | 2-¾ | 4.635 |
| 4″ | 4 | 6-⅛ | 7.073 | 3-⅝ | 6.135 |
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