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Boltport Fasteners trades a wide range of ASTM A320 Grade L7 Bolts, which are widely used in high end industrial and engineering projects. ASTM A320 Grade L7 Stainless Steel Bolts offer features like Trouble free performance, Precisely-designed, Enhanced service life, Robustness, Accurate size, Corrosion proof, etc. Different in sizes and patterns our premium quality ASTM A320 Grade L7 AS Bolts is greatly demanded in the market for their speculative features & specifications. We also have a team of quality testers who constantly check the quality of our range of ASTM A320 Grade L7 AS Bolts on various parameters to offer defect free range to our clients.
| Thread Diameters : | M6 to M36 |
| Threads Configuration : | ASME B1.1 2A/3A – 2B/3B Inch Unified Threads and B1.13M 6h-6G Metric Coarse Threads |
| Standard Specification for Alloy-Steel and Stainless Steel Bolting for Low-Temperature Service : | The ASTM A320 specification covers alloy steel and stainless steel bolting materials for low temperature service. This standard covers rolled, forged, or strain hardened bars, bolts, screws, studs, and stud bolts used for pressure vessels, valves, flanges, and fittings. Like the ASTM A193 specification, unless otherwise specified, the 8UN thread series is specified on fastener larger than 1” in diameter. |
| 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 | 0.04% | 0.04% | 0.05% | 0.05% |
| Sulfur, max | 0.04% | 0.04% | 0.03% | 0.03% |
| 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% | 0.20 – 0.30% | 2.00 – 3.00% |
| Grade | Size | Tensile, ksi min | Yield, ksi, min | Charpy Impact | Elong, % min | RA, %, min |
|---|---|---|---|---|---|---|
| L7 | up to 21/2 | 125 | 105 | -150° F | 16 | 50 |
| L43 | sup a 4 | 125 | 105 | -150° F | 16 | 50 |
| B8 Class 1 | all | 75 | 30 | N/A | 30 | 50 |
| B8M Class 1 | all | 75 | 30 | N/A | 30 | 50 |
| B8 Class 2 | Up to 3/4 | 125 | 100 | N/A | 12 | 35 |
| 7/8 – 1 | 115 | 80 | N/A | 15 | 35 | |
| 11/8 – 11/4 | 105 | 65 | N/A | 20 | 35 | |
| 13/8 – 11/2 | 100 | 50 | N/A | 28 | 45 | |
| B8M Class 2 | Up to 3/4 | 110 | 95 | N/A | 15 | 45 |
| 7/8 – 1 | 100 | 80 | N/A | 20 | 45 | |
| 11/8 – 11/4 | 95 | 65 | N/A | 25 | 45 | |
| 13/8 – 11/2 | 90 | 50 | N/A |
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ASTM A320 Grade L7 Alloy Steel Bolts are developed with the use of hi-tech machines and instruments at the sound manufacturing unit. ASTM A320 Grade L7 Alloy Steel Bolts is a solid solution alloy that can only be hardened by cold working, where quality is the most important parameter for customer satisfaction. ASTM A320 Grade L7 AS Bolts is often used in chemical processing, transport and storage – tanks, piping, pressure vessels, and heat exchangers. Financial stability, credibility, goodwill and reputation are some of the key parameters that our quality controllers appoint our manufacturing staff for ASTM A320 Grade L7 SS Bolts. Adding lead to the brasses in amounts of 0.5 % to 4 % over ASTM A320 Grade L7 AS Bolts, results in free cutting of free-machining alloys in which the elemental lead is present as uniformly dispersed particles.
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