ASTM A325 Black Oxide Hex Head Bolts
ASME B18.2.1 black finish ASTM A325 structural heavy hex bolt
Heavy Hex Bolts are designed for use in a variety of high temperature, high strength industrial applications, such as with steel fabrication and general construction. They feature a thicker head than standard or regular hex bolts, and offer a greater bearing surface that distributes the clamping load over a wider area. Heavy hex bolts can be made with a few different materials including low and medium carbon steel, alloy, and stainless steel, and are available plain, hot dipped galvanized, phosphate, zinc or cadmium plated. Some sizes of heavy hex bolts are fully threaded while other sizes offer a smooth shoulder area.
SIZE: 1/4" - 1.1//2", M6 -M36. And 600mm Max length.
STANDARD: ASME B18.2.6
THREAD: ASME B1.1 , UNC, UNF, CLASS 2A
FINISHED: Plain, Zinc Plated(Clear/Blue/Yellow/Black), Black oxide, Nickel, Dacromet, H.D.G.
| A325 Types | |
| TYPE 1 | Medium carbon, carbon boron, or medium carbon alloy steel. |
| TYPE 2 | Withdrawn November 1991. |
| TYPE 3 | Weathering steel. |
| T | Fully threaded A325. (Restricted to 4 times the diameter in length) |
| M | Metric A325. |
| A325 Mechanical Properties | ||||
| Size | Tensile, ksi | Yield, ksi | Elong. %, min | RA %, min |
| 1/2-1" | 120 min | 92 min | 14 | 35 |
| 1.1/8"-1.1/2" | 105 min | 81 min | 14 | 35 |
| A325 Type 1 Chemical Properties | ||
| Heat Analysis | 120ksi, % | 150ksi, % |
| Carbon | 0.30 – 0.52 | 0.30 – 0.48* |
| Manganese | 0.60 min | 0.60 min |
| Phosphorus | 0.035 max | 0.035 max |
| Sulfur | 0.040 max | 0.040 max |
| Silicon | 0.15 – 0.30 | - |
| Boron | 0.003 max | 0.003 max |
| Copper | - | - |
| Nickel | - | - |
| Chromium | - | - |
| Molybdenum | - | - |
| A325 Type 3 Chemical Properties | ||||
| Heat Analysis | 120ksi, % Comp A | 120ksi, % Comp B | 120ksi, % Index | 150ksi, % Index |
| Carbon | 0.33 – 0.40 | 0.38 – 0.48 | 0.30 – 0.52 | 0.30 – 0.53 |
| Manganese | 0.90 – 1.20 | 0.70 – 0.90 | 0.60 min | 0.60 min |
| Phosphorus | 0.035 max | 0.035 max | 0.035 max | 0.035 max |
| Sulfur | 0.040 max | 0.040 max | 0.040 max | 0.040 max |
| Silicon | 0.15 – 0.30 | 0.30 – 0.50 | ||
| Copper | 0.25 – 0.45 | 0.20 – 0.40 | 0.20 – 0.60 | 0.20 – 0.60 |
| Nickel | 0.25 – 0.45 | 0.50 – 0.80 | 0.20 min | 0.20 min |
| Chromium | 0.45 – 0.65 | 0.50 – 0.80 | 0.20 min | 0.20 min |
| Molybdenum | 0.06 max | 0.10 min | 0.10 min | |
| A325 RECOMMENDED HARDWARE | |||
| Type | Finish | Nut | Washer |
| Type 1 | plain | A563 Grade C, C3, D, DH, DH3 | F436 Type 1 |
| galvanized | A563 Grade DH | F436 Type 1 | |
| Type 3 | plain | A563 Grade C3, DH3 | F436 Type 3 |
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