ASTM A320 Grade L7 hex bolts are alloy-steel bolting components covered by ASTM A320/A320M for specified low-temperature service. Applications may include pressure vessels, valves, flanges, fittings and associated industrial equipment where Grade L7 is required by the project specification.
QISHENG can review the requested dimensions, thread form, surface treatment, mating components, impact-testing requirements and documentation. Applicable test temperature, mechanical requirements and product availability are confirmed against the specified standard edition and written quotation.
Product Parameter (Specification)
| Standard | ASTM A320/A320M | Material | Ferritic Chromium-Molybdenum Alloy Steel (Cr-Mo) |
| Surface Treatment | Plain, zinc plated, hot-dip galvanized or PTFE-coated options, subject to size, specification and application review | Shank | Full thread, Partial thread |
| Grade | L7 | Low-Temp Requirement | Charpy V-Notch Impact Tested at -150°F (-101°C) |
| Unite | Piece,KGS,TON | Size | 1/4″ – 4″ (Metric: M6 – M100) |
| Mating Nuts | Mating nut grade and impact-testing requirements to be confirmed against the project specification and service conditions. | Packing | Bulk cartons with pallet, small boxes in cartons with pallet |
Applications for ASTM A320 Grade L7 Bolting
ASTM A320 Grade L7 bolting may be specified for low-temperature industrial equipment, including pressure vessels, valves, flanges, fittings and associated piping connections. Product suitability depends on the applicable design code, operating temperature, dimensions, mating components, coating, impact-testing requirements and project documentation.
For LNG, petrochemical, cold-region or other specialized applications, the purchaser or project engineer should confirm the required bolting grade, test temperature, impact values and complete assembly specification.
ASTM A320 Grade L7 Application Scenarios
| Industry/Application | Example connection | Product reference | Items to confirm |
| LNG and low-temperature processing | Valves, flanges and piping connections | ASTM A320 Grade L7 where specified | Operating temperature, impact-test requirements, mating nuts and documentation |
| Cold-region industrial equipment | Exposed flanges and bolted equipment | Grade and coating subject to project review | Design temperature, corrosion exposure, coating and maintenance |
| Petrochemical and pressure systems | Pressure vessels, valves and fittings | ASTM A320 Grade L7 where specified | Design code, pressure, temperature, dimensions and testing |
| Cold-storage and industrial facilities | Mechanical equipment and piping connections | Product and grade subject to specification | Environmental exposure, bolt dimensions, finish and assembly requirements |
How to Request a Quote
Tell us the product, specification and quantity you need. Drawings, standards, operating-temperature information or inspection requirements can be provided if available.
- Product and grade: For example, ASTM A320 Grade L7 hex bolt
- Size: Diameter and length
- Quantity: Pieces, kilograms or other purchasing unit
- Optional details: Thread configuration, coating, mating nut, operating temperature, drawings and inspection documents
QISHENG will review the available information and advise what additional details are needed for quotation.
Request a quote for ASTM A320 Grade L7 hex bolts. Tell us the required size, specification and quantity, and include operating-temperature or inspection requirements if available.
