ASTM A320 L7 Stud Bolts | Low-Temperature Pressure Equipment Fasteners
Low-temperature alloy-steel stud bolts for cryogenic and cold-service flanges, valves and pressure equipment.
ASTM A320 L7 is a chromium-molybdenum alloy-steel bolting grade selected for low-temperature service. LOKRON can supply L7 studs with the required impact-test records, matched nuts, heat traceability and project documentation.
Specification and supply scope
| Standard | ASTM A320 / ASME SA320 Grade L7; verify the required class, size and impact-test temperature. |
|---|---|
| Service focus | Low-temperature pressure vessels, valves, piping and hydrocarbon process equipment. |
| Pairing | Project-specified ASTM A194 Grade 4, 7 or compatible nut grade. |
| Testing | Mechanical properties, hardness and Charpy impact testing when required by the purchase specification. |
| Documents | EN 10204 Type 3.1 MTR, impact-test results and inspection records as applicable. |
Typical applications
- âLNG and low-temperature process equipment
- âCryogenic valves and piping flanges
- âStorage and pressure-vessel assemblies
- âOil & gas equipment exposed to cold service
Documentation available
- âHeat/lot traceability
- âTensile, yield and elongation results
- âCharpy impact-test records
- âDimensional and hardness inspection
Related engineering resources
Need a grade, drawing or complete bolting set?
Send the standard, size, quantity, coating and service condition. LOKRON's technical sales team can confirm scope and documentation within 24 hours.
Request a technical quoteFrequently asked questions
What is the main difference between A193 B7 and A320 L7?
L7 is specified for low-temperature service and requires impact testing at the applicable temperature; B7 is more commonly selected for high-temperature/high-pressure service.
Does every L7 order require Charpy testing?
The required impact-test temperature and frequency depend on the purchase specification and applicable standard requirements. Confirm them before quotation.
Can L7 stud bolts be supplied with PED documentation?
Yes, when the grade and order fall within the applicable PED quality scope and the required documentation is specified.