Unifit Metalloys Inc manufactures and supplies ASTM A320 Grade L7 fasteners that are built for tough jobs in low temperature and high pressure environments. These fasteners are made from alloy steel and go through a special heat treatment to improve strength, toughness and corrosion resistance. You can count on ASTM A320 L7 bolts, nuts studs and screws to hold up even in freezing or cryogenic conditions. That’s why they are widely used in oil and gas power plants, petrochemical sites and heavy engineering work where safety and reliability really matter.
ASTM A320 L7 Hex Head Bolts are made to stay strong even in extreme cold down to minus 150°F or minus 101°C. These bolts are a great choice for arctic environments, LNG plants and other cryogenic applications. Made from alloy steel they offer high tensile and yield strength. The tempering process adds stability so the bolts can handle tough conditions without losing their shape or performance.
ASTM A320 L7 Hex Head Screws go through proper thermal treatment and microstructure control to reduce brittleness and improve fatigue resistance. This makes them a reliable option for pressure vessels, valves, flanges and pipelines. ASTM A320 L7 washers and hex nuts are also known for resisting stress corrosion cracking and hydrogen embrittlement which is important in high pressure environments. Their strength and long life make them a trusted choice for critical applications.
Request QuoteWhat is ASTM A320 Grade L7?
ASTM A320 Grade L7 is a strong alloy steel fastener made with chromium and molybdenum designed for low temperature use. These fasteners go through quenching and tempering which makes them stronger and helps them stay tough even in freezing weather. That is why they are used in places where parts cannot afford to crack or break. ASTM A320 L7 bolts studs and nuts also resist corrosion stress cracking and oxidation which makes them a reliable choice for cold and demanding environments where strength and durability really matter.
These fasteners are used in cryogenic storage tanks, low temperature pipelines, LNG plants, pressure vessels, heat exchangers and industrial valves. They can handle thermal shock and stay strong even in freezing environments which makes them important in oil and gas petrochemical and power generation industries. Whether it is holding pressure parts together or dealing with cryogenic fluids ASTM A320 Grade L7 fasteners are known for their strength reliability and long life in some of the toughest working conditions.
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Types of ASTM A320 L7 Fasteners
ASTM A320 Grade L7 fasteners are made to perform in extremely cold environments and are available in different types to fit a wide range of industrial needs. These fasteners provide strong tensile strength good toughness and resistance to corrosion which makes them ideal for sub zero conditions.
We offer a complete range of ASTM A320 Gr L7 bolts screws and stud bolts designed for use in low temperature and high strength applications across various industries:
- ASTM A320 L7 Structural Bolts
- ASTM A320 L7 Heavy Hex Bolts
- ASTM A320 L7 Hex Bolts
- ASTM A320 L7 Hexagon Head Bolts
- ASTM A320 L7 Machine Bolts
- ASTM A320 Grade L7 T Bolts
- ASTM A320 Gr. L7 Eye Bolt
- ASTM A320 L7 Foundation Bolts
- Alloy Steel A320 Gr L7 J Bolts
- ASTM A320 L7 Button Head Bolt
- ASTM A320 L7 Anchor Bolts
- ASTM A320 L7 Long Bolts
- ASTM A320 L7 Carriage Bolt
- ASTM A320 L7 Elevator Bolt
- ASTM A320 L7 Timber Bolts
- ASTM A320 L7 Square Bolt
- ASTM A320 L7 Metric Bolt
- ASTM A320 L7 Plow Bolts
- Alloy Steel Gr. L7 U Bolts
- ASTM A320 L7 Flange Bolts
- ASTM A320 L7 Socket Set Screw
- ASTM A320 L7 Self Drilling Screw
- ASTM A320 L7 Socket Head Cap Screw
- ASTM A320 L7 Hex Head Screws
- ASTM A320 L7 Wood Screw
- ASTM A320 Gr. L7 Eye Screw
- ASTM A320 Gr. L7 Wing Screw
- ASTM A320 L7 Self Tapping Screws
- ASTM A320 Gr. L7 Roofing Screw
- ASTM A320 L7 Phillips Head Screw
- ASTM A320 L7 Decking Screw
- ASTM A320 L7 Machine Screw
- ASTM A320 L7 Thumb Screw
- ASTM A320 L7 Drywall Screws
- ASTM A320 L7 Chipboard Screw
- ASTM A320 L7 Metric Set Screws
- Alloy Steel L7 Sems Screw
- ASTM A320 L7 Thread Rolling Screw
- ASTM A320 L7 Full Threaded Stud Bolts
- ASTM A320 L7 Half Threaded Stud Bolts
- Alloy Steel ASTM A320 L7 Threaded Rod
- ASTM A320 L7 Double Ended Studs
- ASTM A320 L7 Tap End Stud Bolt
- Alloy Steel ASTM A320 L7 Tie Rods
- Alloy Steel A320 Grade L7 Studs
- ASTM A320 L7 Single End Stud Bolts
- A320 Gr.L7 Reduced Shank Stud Bolt
- A320 L7 Continuous Threaded Stud Bolt
- A320 L7 Partial Threads Stud Bolt
- SA320 / A320 L7 Heavy Stud Bolts
All ASTM A320 Grade L7 fasteners are manufactured and supplied by Unifit Metalloys Inc., conforming to international standards such as ASTM and ASME. We offer standard and customized sizes ensuring precision fit and reliable performance in the most demanding operating environments.
ASTM A320 Grade L7 Chemical Composition
ASTM A320 Grade L7 fasteners are made for use in cold environments where regular fasteners might not hold up. The L7 grade means they are heat treated to improve strength and toughness and to help prevent them from becoming brittle in low temperatures. Their chemical mix is balanced to give steady performance in cryogenic setups like LNG plants, pressure vessels and cold pipelines where reliability really matters.
| Element | Minimum (%) | Maximum (%) |
|---|---|---|
| Carbon (C) | 0.37 | 0.49 |
| Manganese (Mn) | 0.65 | 1.10 |
| Phosphorus (P) | — | 0.035 |
| Sulfur (S) | — | 0.040 |
| Silicon (Si) | 0.15 | 0.35 |
| Chromium (Cr) | 0.75 | 1.20 |
| Molybdenum (Mo) | 0.15 | 0.25 |
The ASTM A320 Grade L7 chemical composition ensures resistance to embrittlement and superior impact performance in sub-zero temperatures.
ASTM A320 Grade L7 Raw Material
The following table outlines the key raw material of ASTM A320 Grade L7 fasteners, crucial for their performance in low-temperature environments.
| Grade | Raw Material Description |
|---|---|
| ASTM A320 L7 | Alloy steel, AISI 4140/4142 quenched and tempered |
ASTM A320 Grade L7 Material Specification for Fasteners
| Specification | Details |
|---|---|
| Specifications | ASTM A320 / ASME SA320 |
| Length | 3mm to 200mm |
| Size | 3/6″ to 2″, M3 – M56, Custom Sizes |
ASTM A320 Grade L7 Mechanical Properties of Fasteners
ASTM A320 Grade L7 fasteners are made to perform well in low temperature conditions. These fasteners are designed to stay strong and reliable even when the temperature drops far below zero. The table below shows the mechanical properties that make ASTM A320 L7 fasteners a good choice for tough applications in freezing environments.
| Size | Tensile Strength (ksi, min) | Yield Strength (ksi, min) | Charpy Impact 20-ft-lbf @ temp | Elongation (%) min | Reduction of Area (%) min | Hardness (max) |
|---|---|---|---|---|---|---|
| Up to 2-½ | 125 | 105 | -150° F | 16 | 50 | C35 |
These mechanical properties ensure ASTM A320 Grade L7 fasteners maintain their integrity and perform reliably in extreme low-temperature environments.
A320 L7 vs. A193 B7 Fasteners – Key Differences
When comparing the differences of A320 L7 and A193 B7 fasteners, it’s essential to consider their unique strengths and optimal use cases.
| Feature | A320 L7 | A193 B7 |
|---|---|---|
| Service Temperature | Low (Cryogenic) | High (Elevated) |
| Applications | LNG, Sub-zero | Boilers, Valves, Steam |
| Material Treatment | Quenched & Tempered | Quenched & Tempered |
| Standard | ASTM A320 | ASTM A193 |
ASTM A320 Grade L7 Fasteners Standards
The ASTM A320 Grade L7 fasteners are crafted in compliance with rigorous industry standards to ensure exceptional performance in low-temperature applications.
| Hexagon Bolt / Set Screws | Stud Bolt | Hexagon Nuts | Socket Cap screws |
|---|---|---|---|
| DIN 931 | BS4882 | DIN 934 | DIN 912 |
| DIN 933 | DIN 976 | BS 1768 | DIN 6912 |
| BS 1768 | BS 1769 | DIN 7984 | |
| UNI 5731 | BS 1083 | ANSI B18.3 | |
| UNI 5739 | BS 3692 | ISO 4762 | |
| ISO 4014 | ISO 4032 | UNI 5931 | |
| ISO 4017 | ISO 4033 | BS 2470 | |
| BS 1769 | ANSI B18.2.2 | BS 4168 | |
| BS 3692 | |||
| ANSI B18.2.1 |
| Socket & Slotted Set Screws | Socket & Slotted Countersunk Screws | Studs | Washers |
|---|---|---|---|
| DIN 913 | DIN 963 | DIN 938 | DIN 125 |
| DIN 914 | DIN 7991 | DIN 939 | DIN 9021 |
Applications of ASTM A320 Grade L7 Fasteners
ASTM A320 Grade L7 fasteners are built for tough environments where things get really cold and strength still matters. They’re used in places where equipment needs to stay reliable no matter how low the temperature drops. You’ll find these fasteners used across industries that can’t afford failure in extreme cold like:
- Heavy Engineering Industries
- Petro-Chemical Industries
- Shipbuilding Industries
- Fertilizer Plants
- Civil Construction Industries
- Power Generation Units (Nuclear, Hydro, or Thermal)
- Civil Industries
- Oil Expansion Projects
- Offshore & Onshore Oil Towers
- Valves
- Pressure Vessels
- Home Fittings
- Pumps
- Railways
- Steel Plants
ASTM A320 Grade L7 Price in India for Fasteners
Unifit Metalloys Inc offers the best prices for ASTM A320 L7 fasteners in India without compromising on quality. Whether you need A320 L7 hex bolts, L7 studs or heavy hex nuts we supply fasteners that meet international standards and perform well in low temperature conditions. Our products are known for their strength, durability and reliable performance even in extreme environments. With fast delivery and technical support we make sure you get the right fasteners on time so your project stays safe, strong and on schedule.
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