ASTM A320 L7 Stud Bolts & Hex Bolts Manufacturer, Exporter & Supplier
ASTM A320 Grade L7 Stud Bolts, ASTM A320 Grade L7 Hex Bolts, Nuts & Washers – ASTM A320 Grade L7 Manufacturer, ASTM A320 Grade L7 Exporter & ASTM A320 Grade L7 Supplier in India
Dipti Metal Industries, founded in 2009 by Mr. Kumpsingh Rajput in Mumbai, India, is a global leader and top ASTM A320 Grade L7 Manufacturer, ASTM A320 Grade L7 Exporter, ASTM A320 Grade L7 Stockist, ASTM A320 Grade L7 Dealer, and wholesaler of ASTM A320 Grade L7 Stud Bolts, ASTM A320 Grade L7 Hex Bolts, Nuts & Washers.
We specialize in supplying high-strength alloy steel fasteners designed for low-temperature and cryogenic applications. With ISO 9001:2015 certification, third-party inspection approvals, large ready stock, and exports to 150+ countries, Dipti Metal Industries is trusted by EPC contractors, OEMs, distributors, and major industries worldwide.
📖 About ASTM A320 Grade L7
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✅ Specification for low-temperature alloy steel fasteners
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✅ Suitable for pressure vessels, flanges, valves, and fittings
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✅ Manufactured by forging, rolling, or strain-hardening
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✅ Quenched & tempered for durability
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✅ Retains strength down to -150°F (-101°C)
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✅ Larger than 1” fasteners use 8UN thread series
🛠 Product Range
We manufacture and supply the complete range of ASTM A320 L7 Fasteners:
🔩 ASTM A320 Grade L7 Stud Bolts (with Heavy Hex Nuts)
🔩 ASTM A320 Grade L7 Hex Bolts (Forged Head)
🔩 Nuts (ASTM A194 Grade 7)
🔩 Washers (Flat, Spring, Hardened)
🔩 Double Ended Studs & Foundation Studs
🔩 Wind Energy & Turbine Fasteners
Thread Types: UNC, UNF, Metric
Size Range: ¼” to 4” (M6 – M100), Length up to 1000 mm
Surface Finish: Plain, Black Oxide, Zinc, Hot Dip Galvanized, PTFE, Nickel, Silver, etc.
🧪 Chemical Composition – ASTM A320 L7
| Element | Content (%) |
|---|---|
| Carbon (C) | 0.08 max |
| Manganese (Mn) | 2.00 max |
| Phosphorus (P) | 0.04 max |
| Sulfur (S) | 0.03 max |
| Silicon (Si) | 1.00 max |
| Nickel (Ni) | 24.00 – 27.00 |
| Chromium (Cr) | 13.50 – 16.00 |
| Molybdenum (Mo) | 1.00 – 1.50 |
| Titanium (Ti) | 1.90 – 2.35 |
| Aluminium (Al) | 0.35 max |
| Vanadium (V) | 0.10 – 0.50 |
| Boron (B) | 0.001 – 0.010 |
⚙ Mechanical Properties – ASTM A320 L7
| Class | Diameter | Heat Treatment | Tensile Strength (min) | Yield Strength (min) | Elongation (%) | Reduction of Area (%) | Hardness |
|---|---|---|---|---|---|---|---|
| A, B & C | ≤ 2½ in (65 mm) | Quenched & Tempered | 130 ksi (895 MPa) | 85 ksi (585 MPa) | 15 | 18 | 24–27 HRC |
| D | ≤ 2½ in (65 mm) | Quenched & Tempered | 130 ksi (895 MPa) | 105 ksi (725 MPa) | 15 | 18 | 24–35 HRC |
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🔎 Charpy V-Notch Impact Tested
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🔎 Stress Rupture Tested
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🔎 Hardness Range: 24–36 HRC
🎨 Coating & Plating Options
We supply ASTM A320 L7 Bolts, Nuts & Washers in multiple coatings for diverse industries:
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Plain ASTM A320 L7 Stud Bolts
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Black Oxide Coated ASTM A320 L7 Bolts
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Zinc Plated ASTM A320 L7 Fasteners
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Cold Galvanized Coated ASTM A320 L7 Stud Bolts
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Hot-Dip Galvanized ASTM A320 L7 Hex Bolts (HDG)
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Sherardized ASTM A320 L7 Nuts & Washers
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PTFE / Xylan Coated ASTM A320 L7 Bolts
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Teflon Coated ASTM A320 L7 Studs
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Epoxy Coated ASTM A320 L7 Fasteners
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Manganese & Zinc Phosphate Coated ASTM A320 L7 Bolts
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Nickel Plated ASTM A320 L7 Hex Bolts
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Silver Plated ASTM A320 L7 Stud Bolts (Cryogenic service)
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Copper Plated ASTM A320 L7 Nuts & Washers
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Chromium Plated ASTM A320 L7 Bolts
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Geomet® Coated ASTM A320 L7 Fasteners
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Dacromet® Coated ASTM A320 L7 Stud Bolts
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Magni® Coated ASTM A320 L7 Hex Bolts
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Ruspert® Coated ASTM A320 L7 Fasteners
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SermaGard® Coated ASTM A320 L7 Bolts & Washers
🌟 Key Advantages
✨ Low-Temperature Toughness – Reliable down to -150°F (-101°C)
✨ High Strength & Integrity – Excellent tensile and yield properties
✨ Corrosion Protection – Coatings extend service life in harsh environments
✨ Versatility – Compatible with ASTM A194 Grade 7 nuts
✨ Certified Quality – ISO, IBR, NACE MR0175, EN 10204 3.1/3.2
🏭 ASTM A320 Grade L7 Applications
⚡ LNG plants & cryogenic services
⚡ Oil & Gas pipelines & offshore rigs
⚡ Refineries & petrochemical plants
⚡ Power plants & nuclear stations
⚡ Boilers, heat exchangers & pressure vessels
⚡ Wind energy towers & turbine foundations
⚡ Refrigeration systems
🌎 ASTM A320 Grade L7 Domestic & Global Supply Network
📍 India Supplies – Mumbai, Bengaluru, Chennai, Hyderabad, Kolkata, Pune, New Delhi, Ahmedabad, Jaipur, Surat, Ludhiana, Vadodara, Nagpur, Raipur, Coimbatore, Indore, Lucknow and more.
🌐 Global Exports – USA, UK, Germany, France, Italy, Saudi Arabia, UAE, Qatar, Oman, Kuwait, Singapore, Australia, Brazil, South Africa, Nigeria, Canada, Mexico, Malaysia, Turkey, Poland, Belgium, and over 45+ countries.
💡 Why Choose Dipti Metal Industries?
🏆 Founded in 2009 by Mr. Kumpsingh Rajput
🏆 ISO 9001:2015 Certified Manufacturer of ASTM A320 Grade L7
🏆 Large ASTM A320 Grade L7 Stock & Quick Dispatch from Mumbai
🏆 Customized Packaging & Coating Options for ASTM A320 Grade L7
🏆 Third-Party Inspection (TPI) Approved ASTM A320 Grade L7 Fasteners
🏆 Export-Ready Documentation & Logistics Support for ASTM A320 Grade L7 Requirements
📞 Contact Us
Looking for a reliable ASTM A320 L7 Stud Bolts, ASTM A320 Grade L7 Hex Bolts, Nuts & Washers Manufacturer & Exporter in India?
📩 Dipti Metal Industries guarantees certified products, competitive pricing, and fast worldwide delivery.
✨ Request Your Free Quote Today!
