Shanghai Powermax Fastener Co., Ltd.
Shanghai Powermax Fastener Co., Ltd. Quality first, Clients first.
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ASTM A193 Grade B7 Heavy hex bolts with ASTM A194 2H heavy hex nut
Heavy hex cap screws and heavy hex bolts feature a large fastener head for distributing clamping load. These fasteners are used at high pressures and temperatures. Hex cap screws have a washer face underneath the head and are used in precise applications. Heavy hex head bolts are commonly used to make structural connections in buildings, bridges, and railways.
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 |
