ASTM A320 Grade L7

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.

A320 L7Low-temperature boltingImpact-tested studsPressure equipment

Quick answer

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, 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.
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

✓LNG and low-temperature process equipment
✓Cryogenic valves and piping flanges
✓Storage and pressure-vessel assemblies
✓Oil & gas equipment exposed to cold service

Documentation available

✓Heat/lot traceability
✓Tensile, yield and elongation results
✓Charpy impact-test records
✓Dimensional and hardness inspection

Related engineering resources

L7 complete guide

Review selection, properties and low-temperature service.

Torque calculator

Estimate starting torque from preload and lubrication.

PED grade index

Check the pressure-equipment product scope.

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 quote

Frequently 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.

Engineered for demanding applications

See where LOKRON high-strength fasteners perform: pressure equipment, process plants, power generation and precision vehicle systems.

Industrial valve assembly using precision fasteners

Pressure equipment

Flanges, valves and pressure vessels

Oil and gas process equipment for high-pressure bolting

Oil & gas

Pipeline and high-pressure flange service

Petrochemical

Heat exchangers and process piping

Power generation

High-temperature and critical-duty joints