ASTM A320 L7 Stud Bolts This is the most common A320 bolt grade. A320 Grade L7 bolts and threaded studs are manufactured from alloy steel with chromium, manganese, and molybdenum. The bolts undergo a heat treating process to reach their required mechanical properties. L7 threaded studs and short, headed bolts are readily available in the marketplace. These bolts are typically bought and sold in a plain, bare metal finish. L7 bolts are available through 4” in diameter. A320 Grade L7 bolts larger than 1/2″ diameter require a Charpy impact test.
A320 Grade L7 is intended for low-temperature service down to -150° F and has a minimum Charpy impact value of 20-ft-lbf at this temperature.
Savoy Piping Inc. stocks ASTM A320 Stud Bolts from 3/8” - 4” diameter in Imperial Sizes: Plain (black) finish, Teflon Blue, and Cadium Plating. We also stocks B8 and B8M stud bolts. We can also provide larger stud bolts, stud bolts made from different materials (L7, L43, B8M, B8M, , Alloy 20, Monel, Hastelloy, Inconel, Titanium, etc), as well as different coatings. While many of the larger diameter items can be made available for a next-day delivery, some of the special alloys and coatings may be subject to a longer lead time.
| GRADES | |
| ASTM A320 L7 Alloy steel | AISI 4140/4142 Quenched and tempered |
| ASTM A320 L43 Alloy steel | AISI 4340 Quenched and tempered |
| ASTM A320 B8 Class 1 Stainless steel | AISI 304, carbide solution treated |
| ASTM A320 B8M Class 1 Stainless steel | AISI 316, carbide solution treated |
| ASTM A320 B8 Class 2 Stainless steel | AISI 304, carbide solution treated, strain hardened |
| ASTM A320 B8M Class 2 Stainless steel | AISI 316, carbide solution treated, strain hardened |
See Also: ASTM A320 at ASTM.org.
| 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 |
| Element | L7 (AISI 4140) |
| Carbon | 0.37 - 0.49% |
| Manganese | 0.65 - 1.10% |
| Phosphorus, max | 0.035% |
| Sulfur, max | 0.040% |
| Silicon | 0.15 - 0.35% |
| Chromium | 0.75 - 1.20% |
| Nickel | |
| Molybdenum | 0.15 - 0.25% |
| Bolt Grade | Nuts | Washers |
| L7 | A194 Grade 4 or 7 | F436 |
| ASTM A320 L7 Stud Bolts Size Range | 3/8" to 4" Diameter (Imperial & Standard) . |
| ASTM A320 L7 Stud Bolts Types | All Thread, Double End, Single End |
| ASTM A320 L7 Stud Bolts Industry Standards | ANSI – American National Standards Institute: ANSI B 18.2.4 2M, ANSI B 28.2.4 1M DIN: DIN 934, DIN 970 UTS – Unified Thread Standard: UNC, UNF, UNEF, UNS, NPT, NPTF ISO – International Organization for Standardization: ISO 4032, ISO 4033 |
| ASTM A320 L7 Stud Bolts Specification | ASTM A320 / ASME SA320 |
| ASTM A320 L7 Stud Bolts Grades | Carbon Steel: B7, B7M, L7 Stainless Steel:B8, B8 CL2, B8M, B8M CL2, B16 Exotic Alloys: A20, 17-4PH, Monel, Inconel, Incoloy, Hastelloy |
| ASTM A320 L7 Stud Bolts Surface Coating | |
| ASTM A320 L7 Stud Bolts Packaging | Cartoon Box / Wooden Pallet / Wooden Box / Thread Protector |
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For a Standard or Special Fastener, we are at your service! We specialize in Xylan Coated Stud Bolts, those made from Stainless Steel and Non-Ferrous Alloys. Look to Savoy Piping Inc. for fine Products and Reliable Information. Contact us today for All your Fasteners Need
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