ASTM A193 Grade B8T Stainless steel 321 half thread Heavy hex bolts
Heavy hex structural bolts are designed for steel-to-steel structural connections. Consequently, they are typically very short. The A325 and A490 specifications are not intended for general applications, including anchor bolts. In these applications, substitutions of A449 for A325 and A354 grade BD for A490 should be considered.
A193 Grade B7: Alloy steel, AISI 4140 / 4142 quenched and tempered.
A193 Grade B8, Class 1: Stainless steel, AISI 304, carbide solution treated.
A193 Grade B8, Class 2: Stainless steel, AISI 304, carbide solution treated, strain hardened.
A193 Grade B8M, Class 1: Stainless steel, AISI 316, carbide solution treated.
A193 Grade B8M, Class 2: Stainless steel, AISI 316, carbide solution treated, strain hardened.
A193 Grade B16: Alloy steel, chromium-molybdenum-vanadium, quenched and tempered.
NOTE: There are other grades of A193. Those listed here are the ones we receive the most requests for.For information on other types, please contact us.
SIZE: 1/4" - 5", M6 -M100. And 600mm Max length.
THREAD: ASME B1.1 , UNC, UNF, CLASS 2A
FINISHED: Plain, Zinc Plated(Clear/Blue/Yellow/Black), Black oxide, Nickel, Dacromet, H.D.G.
| A193 MECHANICAL PROPERTIES |
| Grade | Size | Tensile, ksi, min | Yield, ksi, min | Elong. % min | RA min | HBW, max | HRC, max |
| B7 | up to 2-1/2" | 125 | 105 | 16 | 50 | 321 | 35 |
| 2-5/8" - 4" | 115 | 95 | 16 | 50 |
| 4-1/8" - 7" | 100 | 75 | 18 | 50 |
| B8 Class 1 | all | 75 | 30 | 30 | 50 | 223 | 35 |
| B8 Class 2 | up to 3/4" | 125 | 100 | 12 | 35 | 321 | 35 |
| 7/8" - 1" | 115 | 80 | 15 | 35 |
| 1-1/8" - 1-1/4" | 105 | 65 | 20 | 35 |
| 1-3/8" - 1-1/2" | 100 | 50 | 28 | 45 |
| B8M Class 1 | all | 75 | 30 | 30 | 50 | 223 | 96 |
| B8M Class 2 | up to 3/4" | 110 | 95 | 15 | 45 | 321 | 35 |
| 7/8" - 1" | 100 | 80 | 20 | 45 |
| 1-1/8" - 1-1/4" | 95 | 65 | 25 | 45 |
| 1-3/8" - 1-1/2" | 90 | 50 | 30 | 45 |
| B16 | under 2-1/2" | 125 | 105 | 18 | 50 | 321 | 35 |
| over 2-1/2" - 4" | 110 | 95 | 17 | 45 |
| over 4" - 8" | 100 | 85 | 16 | 45 |
| A193 CHEMICAL PROPERTIES |
| Element | Grade B7 | Grade B8 | Grade B8M | Grade B16 |
| Carbon | 0.37 - 0.49% | 0.08% max | 0.08% max | 0.36 - 0.47% |
| Manganese | 0.65 - 1.1% | 2.0% max | 2.0% max | 0.45 - 0.7% |
| Phosphorus, max | 0.04% | 0.05% | 0.05% | 0.04% |
| Sulfur, max | 0.04% | 0.03% | 0.03% | 0.04% |
| Silicon | 0.15 - 0.35% | 1.0% max | 1.0% max | 0.15 - 0.35% |
| Chromium | 0.75 - 1.2% | 18.0 - 20.0% | 16.0 - 18.0% | 0.8 - 1.15% |
| Nickel | | 8.0 - 11.0% | 10.0 - 14.0% | |
| Molybdenum | 0.15 - 0.25% | | 2.0 - 3.0% | 0.5 - 0.65% |
| Vanadium | | | | 0.25 - 0.35% |
| Aluminum, max | | | | 0.02% |
| A193 RECOMMENDED HARDWARE |
| Grade | Nut | Washer |
| B7 | A194 Grade 2H | F436 |
| B8 Class 1 | A194 Grade 8 | 304 Stainless |
| B8 Class 2 | A194 Grade 8 | 304 Stainless |
| B8M Class 1 | A194 Grade 8M | 316 Stainless |
| B8M Class 2 | A194 Grade 8M | 316 Stainless |
| B16 | A194 Grade 7 | F436 |
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Stainless Steel 321 Half Thread Heavy Hex Bolts ASTM A193 Grade B8T Images
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