ASTM A320 B8 Class 2 Stud Bolts and threaded studs are manufactured from AISI 304 stainless steel. These bolts are heated and then water-quenched through carbide solution treatment, or solution annealing, which ensures the bolts are corrosion resistant. A320 Grade B8 Class 2 bolts are annealed and strain hardened to achieve increased strength characteristics. These bolts do not require an impact test. Grade B8 Bolts are also called B8 Stainless Steel bolts,
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 |
| 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 |
| Element | B8 (AISI 304) |
| Carbon | 0.08% max |
| Manganese | 2.00% max |
| Phosphorus, max | 0.045% |
| Sulfur, max | 0.030% |
| Silicon | 1.00% max |
| Chromium | 18.0 - 20.0% |
| Nickel | 8.0 - 11.0% |
| Molybdenum |
| Bolt Grade | Nuts | Washers |
| L7 | A194 Grade 4 or 7 | F436 |
| L43 | A194 Grade 4 or 7 | F436 |
| B8 Class 1 | A194 Grade 8 | SS304 |
| B8 Class 2 | A194 Grade 8 | SS304 |
| ASTM A320 B8 Class 2 Stud Bolts Size Range | 3/8" to 4" Diameter (Imperial & Standard) . |
| ASTM A320 B8 Class 2 Stud Bolts Types | All Thread, Double End, Single End |
| ASTM A320 B8 Class 2 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 B8 Class 2 Stud Bolts Specification | ASTM A320 / ASME SA320 |
| ASTM A320 B8 Class 2 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 B8 Class 2 Stud Bolts Surface Coating | |
| ASTM A320 B8 Class 2 Stud Bolts Packaging | Cartoon Box / Wooden Pallet / Wooden Box / Thread Protector |
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