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High-strength, low-alloy steel bolts with ASTM A320 Grade L7 are mostly utilised in low-temperature applications. These bolts are frequently used in sectors that are exposed to cryogenic temperatures, such as oil and gas, chemical processing, and power production. Medium carbon alloy steel is used in the production of ASTM A320 L7 bolts, which undergo heat treatment to acquire the necessary mechanical characteristics, such as high tensile strength and toughness at low temperatures. They are commonly found in piping systems, valves, pressure vessels, and flanged connectors. Bolts made of ASTM A320 L7 are rigorously tested to guarantee that they meet ASTM standards. They offer dependable and safe fastening options for important low-temperature applications.
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ASTM A320 L7 Bolts Specifications
| Grade | ASTM A320 : Grade L7, L7M, B8, B8M |
| Dimensions | ASME B18.2.1, B18.3 |
| Head | Hex, Square, Round, Hex flange, Flat, T-head & Triangular etc |
| Manufacturing Process | Wire Drawing, Cold Heading, Insert tapping, Heat Treatment, Surface Plating, Inspection, Packing |
| Form | Nuts, Bolts |
| Types | Hexagon Nuts, Self Locking Nut, Square Nuts, Hexagon Coupling Nuts, Hexagon Castle Nuts, Hexagon Domed Cap Nuts, Hexagon Thin Nuts, U- Bolts, J Bolts, Mushroom Head Square Neck Bolts, Bolts, Stud Bolts, Hex Head Bolts, Socket Hexagon Head Screw Anchor Bolt, T-Head Bolts, Eye Bolt, Foundation Bolts, Structural Bolts etc |
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ASTM A320 L7 Bolts Equivalent Grade
| L7 | AISI 4140/4142 Quenched and tempered |
| L7M | AISI 4145 Quenched and tempered |
| L43 | AISI 4340 Quenched and tempered |
| B8 Class 1 | AISI 304, carbide solution treated |
| B8 Class 2 | AISI 304, carbide solution treated, strain hardened |
| B8M Class 1 | AISI 316, carbide solution treated |
| B8M Class 2 | AISI 316, carbide solution treated, strain hardened |
ASTM A320 L7 Bolts Inventory
ASTM A320 L7 Bolts
ASTM A320 L7 Stud Bolts
ASTM A320 L7 Hex Bolts
ASTM A320 Bolts and Nuts Property Class
| For Bolts & Screws | A2-70, A2-80, A4-70, A4-80, F593C, F593D, F593G, F593H |
| For Nuts | A2-70, A2-80, A4-70, A4-80, F594C, F594D, F594G, F594H, A2-035, A4-040 |
| For SHCS | F837B, F837C, F837E, F837 |
| For Threaded Rods | A2-70, A2-80, A4-70, A4-80, F593C, F593D, F593G, F593H, B8, B8M CL1 & CL2 |
ASTM A320 L7 Bolts Chemical Composition
| Element | L7 (AISI 4140) | L43 (AISI 4340) | B8 (AISI 304) | B8M (AISI 316) |
| Carbon | 0.37 – 0.49% | 0.38 – 0.43% | 0.08% max | 0.08% max |
| Manganese | 0.65 – 1.10% | 0.75 – 1.00% | 2.00% max | 2.00% max |
| Phosphorus, max | 0.035% | 0.035% | 0.045% | 0.045% |
| Sulfur, max | 0.040% | 0.040% | 0.030% | 0.030% |
| Silicon | 0.15 – 0.35% | 0.15 – 0.35% | 1.00% max | 1.00% max |
| Chromium | 0.75 – 1.20% | 0.70 – 0.90% | 18.0 – 20.0% | 16.0 – 18.0% |
| Nickel | 1.65 – 2.00% | 8.0 – 11.0% | 10.0 – 14.0% | |
| Molybdenum | 0.15 – 0.25% | 0.02 – 0.30% | 2.00 – 3.00% |
ASTM A320 L7 Bolts Mechanical Properties
| Grade | Size | Tensile ksi, min | Yield, ksi, min | Elong, %, min | RA % min | Charpy Impact 20-ft-lbf @ temp |
| L7 | Up to 2-1/2 | 125 | 105 | 16 | 50 | -150° F |
| L43 | Up to 4 | 125 | 105 | 16 | 50 | -150° F |
| B8 Class 1 | All | 75 | 30 | 30 | 50 | N/A |
| B8 Class 2 | Up to 3/4 | 125 | 100 | 12 | 35 | N/A |
| 7/8 – 1 | 115 | 80 | 15 | 35 | N/A | |
| 1-1/8 – 1-1/4 | 105 | 65 | 20 | 35 | N/A | |
| 1-3/8 – 1-1/2 | 100 | 50 | 28 | 45 | N/A | |
| B8M Class 1 | All | 75 | 30 | 30 | 50 | N/A |
| B8M Class 2 | Up to 3/4 | 110 | 95 | 15 | 45 | N/A |
| 7/8 – 1 | 100 | 80 | 20 | 45 | N/A | |
| 1-1/8 – 1-1/4 | 95 | 65 | 25 | 45 | N/A | |
| 1-3/8 – 1-1/2 | 90 | 50 | 30 | 45 | N/A |
Available Stock of ASTM A320 L7 Bolts
- ASME SA 320 L7 Hex Domed Cap Nuts
- ASME SA 320 L7 SS J-Bolts
- ASTM A320 L7 Locking Bolts
- ASTM A320 L7 Foundation Bolts
- ASME SA 320 L7 Castle Bolts
- ASTM A320 L7 Carriage Bolt
- ASTM A320 L7 SS Hex Head Bolt
- ASTM A320 L7 Self locking Bolts
- ASTM A320 L7 SS Step Bolt
- ASME SA 320 L7 Eye Bolt
- ASTM A320 L7 SS Elevator Bolt
- ASTM A320 L7 Stud Bolts
- Stainless Steel L7 Shoulder Bolt
- ASTM A320 L7 Lag Bolt
- ASTM A320 L7 Hex Bolt
- ASTM A320 L7 Serrated Flange Bolts
- ASTM A320 L7 Counter sunk Bolt
- ASTM A320 L7 U Bolt
- ASTM A320 L7 Hex Head Bolts
- Stainless Steel L7 Stud Bolts
- ASTM A320 L7 Structural Bolts
- ASTM A320 L7 T-Head Bolts
- ASME SA 320 L7 Round Head Bolts
- ASME SA 320 L7 Anchor Bolts
- ASTM A320 L7 Stove Bolt
- Stainless Steel L7 Mushroom Head Square Neck Bolts
- ASME SA 320 L7 Nylon Insert Bolts
Applications of ASTM A320 L7 Bolts
- Pipeline Engineering
- Marine Industry
- Chemical Industry
- Oil & gas industry
- Mechanical Engineering
- Plant Engineering
- Petrochemical Industry
- Power Industry
- Aerospace
- Food Processing Industry
We maintain ready stock of Stainless Steel ASME SA320 L7 Head Bolts, ASTM A320 L7 Draw Bolts, ASTM A320 L7 Hex Head Bolt, Stainless Steel ASME SA320 L7 Head Bolts, ASTM A320 L7 Square Head Bolts. Get in touch with us with your requirement for quick quote.