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TorqBolt Private Limited is a known trader of ASTM A320 L43 (AISI 4340) Bolts, which is used for low-temperature service. Our organization has successfully expanded its business in market owing to the offered elevated quality range of ASTM A320 L43 Nuts, which is inspected on diverse parameters for delivering a defect free range. The offered ASTM A320 L43 Bolts is manufactured by our professionals using sophisticated technology and premium quality of steel. Backed by our vast industrial experience, we have brought forward ASTM A320 L43 Stud Bolts, for our esteemed clients. We are the major steel suppliers with the ability to supply ASTM A320 L43 Washers in both large and small quantities, which are further available in different shapes and sizes. ASTM A320 Table 1 gives Grade L43 properties for diameters up to 4 in [100 mm].
AISI 4340 Fasteners is manufactured from supreme grade material at our well-equipped production unit in conformity to the international standards of quality. Nuts made of Grade L43 must also meet the proof-load requirements for ASTM A194 Grade 4 and 7 nuts and are marked L43. AISI 4340 Bolts has some great features to offer such as Compact design, Superior quality, Longer service life and more. Our AISI 4340 Stud Bolts to Grade L43 are Charpy impact tested at -150 °F [-101 °C], with a minimum average of 20 ft-lbf [27 J] on full-size specimens. Our ranges of AISI 4340 Studs are precisely designed and sturdy in construction. Customers can avail these AISI 4340 Screws in various dimensions and technical specifications.
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Production, Supply, Stock Range of ASTM A320 L43 (AISI 4340)
Thread Diameters : Up to 2-1/2
Threads Configuration : ASME B1.1 2A/3A – 2B/3B Inch Unified Threads and B1.13M 6h-6G Metric Coarse Threads
Certification : Dual Certified As per ASTM & ASME Codes
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. Thread dimensions, finish, marking and certification follow the common requirements of ASTM A962/A962M (ASTM A320 Section 4).
Grades
| ASTM A320 L43 Alloy steel | AISI 4340 Quenched and tempered |
ASTM A320 Grade L43 Chemical Properties
| Element | L43 (AISI 4340) |
|---|---|
| Carbon | 0.38 – 0.43% |
| Manganese | 0.75 – 1.00% |
| Phosphorus, max | 0.04% |
| Sulfur, max | 0.04% |
| Silicon | 0.15 – 0.35% |
| Chromium | 0.70 – 0.90% |
| Nickel | 1.65 – 2.00% |
| Molybdenum | 0.20 – 0.30% |
ASTM A320 Grade L43 Mechanical Properties
| Grade | Size | Tensile, ksi min | Yield, ksi, min | Charpy Impact | Elong, % min | RA, %, min |
|---|---|---|---|---|---|---|
| L43 | sup a 4 | 125 | 105 | -150° F | 16 | 50 |
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