Low Temperature Stud Bolt (L7 / L7M)
Asia Bolts Industries LLC manufactures specialized low temperature stud bolts designed for cryogenic services and sub-zero environments. Conforming to ASTM A320 Grade L7 and L7M, these fasteners maintain toughness and prevent brittle fracture at extreme temperatures.
- Standard: ASTM A320 / ASME SA320
- Grades: L7 (Alloy Steel), L7M (Low Yield Strength)
- Impact Testing: Charpy V-Notch at -101°F (-74°C)
- Certification: Saudi Aramco Approved, ISO 9001, MTC EN 10204 3.1
Essential for LNG, cryogenic pipelines, and refrigeration units. Full traceability and impact test reports provided. Stock available in Dubai.
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ASTM A320 Low Temperature Stud Bolts (Grade L7 / L7M)
In cryogenic applications and sub-zero environments, standard carbon steel fasteners become brittle and prone to catastrophic failure. Asia Bolts Industries LLC supplies high-integrity low temperature stud bolts manufactured to ASTM A320 specifications. Grades L7 and L7M are heat-treated alloy steel fasteners designed to retain impact toughness at temperatures as low as -101°F (-74°C).
As a trusted fastener manufacturer in UAE, we serve the LNG, petrochemical, and refrigeration industries with certified low-temperature carbon steel (LTCS) fasteners. Every batch undergoes rigorous Charpy V-Notch impact testing to ensure safety in critical cold service applications.
Technical Specifications
| Product Type | Low Temperature Stud Bolt (Fully Threaded) |
| Standard | ASTM A320 / ASME SA320 |
| Grade L7 | Alloy Steel (4140), Heat Treated |
| Grade L7M | Alloy Steel, Lower Yield Strength (For Sour Service) |
| Temperature Range | Down to -101°F (-74°C) |
| Diameter Range | M12 to M150 (1/4″ to 6″) |
| Length Range | Custom lengths available per ASTM A320 |
| Heat Treatment | Quenched and Tempered |
| Surface Finish | Plain, Phosphate Coated, PTFE Coated, Hot Dip Galvanized |
| Testing | Charpy V-Notch Impact, Hardness, Tensile, PMI, NACE MR0175 |
| Documentation | MTC EN 10204 3.1, Impact Test Reports, COC, COO |
Difference Between L7 and L7M Stud Bolts
Selecting the correct grade is vital for low-temperature safety:
- ASTM A320 L7: Standard low-temperature alloy steel stud bolts. Suitable for general cryogenic services where high strength is required at sub-zero temperatures.
- ASTM A320 L7M: Similar to L7 but with a lower maximum yield strength. Specifically designed for sour service environments (H2S presence) to prevent Stress Corrosion Cracking (SCC) while maintaining low-temperature toughness.
Quality Control & Impact Testing
At Asia Bolts Industries LLC, we understand that toughness is as important as strength in cryogenic services. Our quality assurance protocol includes:
- Charpy V-Notch Impact Testing: Minimum 20 ft-lbs (27 Joules) average at -101°F (-74°C) as per ASTM A320.
- Heat Treatment Verification: Ensuring proper quenching and tempering to achieve required microstructure.
- Hardness Testing: Verification to ensure compliance with NACE MR0175 for sour service (L7M).
- Dimensional Inspection: Thread gauging to ensure proper fit with ASTM A194 Grade 7 or 7M nuts.
Request a Quote for Low Temp Stud Bolts
Ensure safety in your cryogenic applications with certified fasteners. Contact Asia Bolts Industries LLC today for competitive pricing on low temperature stud bolts. Our team is ready to provide impact test reports and material certifications upon request.
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Packaging Information
📦 Standard: Cartons, wooden boxes or pallets based on quantity and customer requirements
🎁 Custom: Polybag + carton on request
🚢 Export: Fumigated pallets available
📋 Each box includes inspection certificate
Delivery Information
📦 Lead Time: Stock items: 1-5 days | Custom manufacturing: 7-30 days
🚢 Shipping Methods: Air freight, sea freight, or land transportation. FOB, CIF, DDP terms available.
📋 Full export documentation provided with every shipment: Commercial Invoice, Packing List, MTC, Bill of Lading, and Certificate of Origin
☑ Saudi Aramco Approved: Recognized vendor for critical upstream and downstream projects.
🔩 Custom Manufacturing: We produce non-standard lengths and diameters based on your drawings.
🏅 Triple ISO + CE Certified: ISO 9001 Quality, ISO 45001 Safety, and ISO 14001 Environmental certification, plus CE marking for European market compliance.
🏭 32,260 sqm Facility: The largest fastener manufacturing complex in the Middle East, equipped with advanced CNC machinery and full in-house production capability.
🔬 In-House Testing Lab: Full material traceability from raw stock to finished product. Tensile, hardness, dimensional, and spectroscopic testing all performed on-site.
🚚 Global Delivery: Shipped to 70+ countries via established logistics networks. Flexible packaging, documentation and third-party inspection support available.
