ASTM A320 GR L7 Bolts, ASTM A320 GR L7 Stud Bolts, Heavy Hex Bolts & L7 Bolting Supplier in Mumbai, India
Unifit Metal Alloys is a manufacturer, supplier, stockist and exporter of ASTM A320 GR L7 Bolts in Mumbai, India, supplying alloy steel bolting components for low-temperature and high-pressure service. These fasteners are manufactured from chromium-molybdenum alloy steel and are selected for applications where strength, toughness and reliable performance under sub-zero operating conditions are important. We supply different diameters, lengths, thread forms and configurations for standard as well as customized requirements.
ASTM A320 GR L7 Bolts are heat-treated alloy steel fasteners designed to retain suitable mechanical properties when exposed to low temperatures. Their controlled manufacturing and heat-treatment process provides the strength and toughness required for demanding bolted connections. These bolts are commonly used with compatible nuts in flanged joints, pressure equipment and piping assemblies where the fastening system must remain dependable during cold service.
ASTM A320 GR L7 Bolts, ASTM A320 GR L7 Stud Bolts, Heavy Hex Bolts & L7 Bolting Manufacturer and Supplier in Mumbai, India
These fasteners are widely used in oil and gas facilities, petrochemical plants, refineries, cryogenic and low-temperature systems, pressure vessels, pipelines, valves and industrial processing equipment. Grade L7 is particularly suitable for applications where conventional bolting materials may not provide the required toughness at reduced temperatures.
At Unifit Metal Alloys, we supply ASTM A320 GR L7 Bolts in various sizes, lengths, thread configurations and surface finishes. We cater to maintenance requirements, fabrication work, bulk orders and industrial projects.
Get the Best Quote for ASTM A320 GR L7 Bolts. We Stock ASTM A320 GR L7 Bolts in Various Diameters, Lengths, Thread Sizes, Specifications and Surface Finishes. Contact Us Today for a Competitive Quote.
ASTM A320 GR L7 Bolts Specification & Dimensions
| Parameter | Details |
|---|---|
| Standard | ASTM A320 / ASME SA320 Grade L7 |
| Dimensions | ASME B18.2.1 (inch hex bolts), ASME B18.2.3.3M (metric hex), ASME B18.3 (socket cap) |
| Thread standard | ASME B1.1 — 2A/3A Unified Inch; ASME B1.13M — 6h Metric Coarse |
| Size range (inch) | ¼” to 4″ diameter |
| Size range (metric) | M6 to M100 |
| Length range | Custom lengths; standard 1″ to 36″ |
| Heat treatment | Quenched & Tempered — min. tempering temperature 593°C (1100°F) |
| Hardness | 321 HBW maximum / 35 HRC maximum |
| Dual certification | Dual certified as per ASTM & ASME codes |
| Sour service | NACE MR0103 / MR0175 / ISO 15156 compliance (Grade L7M) |
| PED compliance | PED 97/23/EC; Merkblatt AD 2000 W2 |
| Marking | Manufacturer’s ID mark + “L7” symbol marking |
| Finish / coating | Plain, Hot-Dip Galvanized (HDG), Black Oxide, Xylan, PTFE, Zinc Flake, Cadmium (per request) |
| Melt origin | Korea, Japan, Europe, South America (traceable MTR provided) |
Chemical Composition for ASTM A320 GR L7 Bolts
| Element | Carbon (C) | Manganese (Mn) | Phosphorus (P) max | Sulfur (S) max | Silicon (Si) | Chromium (Cr) | Molybdenum (Mo) |
|---|---|---|---|---|---|---|---|
| Grade L7 (%) | 0.38–0.48 | 0.75–1.00 | 0.035 | 0.040 | 0.15–0.35 | 0.80–1.10 | 0.15–0.25 |
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Mechanical Properties of ASTM A320 GR L7 Bolts
| Diameter | Min. Tempering Temp. | Tensile Str. Min (MPa) | Yield Str. Min 0.2% (MPa) | Elongation 4D Min (%) | Reduction of Area Min (%) | Hardness Max |
|---|---|---|---|---|---|---|
| M64 and under | 593°C | 860 | 725 | 16 | 50 | 321 HBW / 35 HRC |
| Over M64 to M100 | 593°C | 795 | 655 | 16 | 50 | 321 HBW / 35 HRC |
| Over M100 to M180 | 593°C | 690 | 515 | 18 | 50 | 321 HBW / 35 HRC |
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ASTM A320 GR L7 Bolts Application Industries
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