Heavy Hex Bolts A325 Type 1, A325 Structural Bolt

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  • Model No.: A325 Structural Bolt
  • Type: Round Head
  • Head Style: Round
  • Grade: A325 Hex Bolt
  • Finish: Fluorocarbon Coated
  • Trademark: C&N
  • Origin: China
  • Material: High Strength Steel
  • Connection: Common Bolt
  • Standard: DIN, ANSI, JIS, GOST
  • Application: Machinery
  • Specification: ASTM A325
  • Thread Type: Heavy Hex
The ASTM A325 standard specifies high-strength heavy hex structural bolts in sizes ranging from ½ inch to 1½ inches in diameter. These bolts are specifically designed for use in structural connections, where shorter thread lengths are required compared to standard hex bolts. For detailed dimensions, including thread length and other specifications, please visit our Structural Bolts page. This specification applies exclusively to heavy hex structural bolts. If you need similar mechanical properties but with different configurations or thread lengths, refer to Specification A449. It also covers general-purpose bolts, including anchor bolts, and quenched and tempered steel bolts and studs with diameters exceeding 1½ inches. ### A325 Bolt Types | Type | Description | |------|-------------| | **Type 1** | Medium carbon, carbon boron, or medium carbon alloy steel | | **Type 2** | Withdrawn in November 1991 | | **Type 3** | Weathering steel | | **T** | Fully threaded A325 (limited to 4 times the diameter in length) | | **M** | Metric A325 | ### A325 Connection Types | Code | Description | |------|-------------| | **SC** | Slip-critical connection | | **N** | Bearing-type connection with threads included in the shear plane | | **X** | Bearing-type connection with threads excluded from the shear plane | ### A325 Mechanical Properties | Size | Tensile (ksi) | Yield (ksi) | Elongation (%) | RA (%) | |------|---------------|-------------|----------------|--------| | ½ - 1" | 120 min | 92 min | 14 | 35 | | 1-1/8 - 1-1/2" | 105 min | 81 min | 14 | 35 | ### A325 Chemical Properties | Element | Carbon Steel | Carbon Boron Steel | Alloy Steel | Alloy Boron Steel | |---------|--------------|--------------------|-------------|-------------------| | Carbon | 0.30–0.52% | 0.30–0.52% | 0.30–0.52% | 0.30–0.52% | | Manganese (min) | 0.60% | 0.60% | 0.60% | 0.60% | | Phosphorus (max) | 0.040% | 0.040% | 0.035% | 0.035% | | Sulfur (max) | 0.050% | 0.050% | 0.040% | 0.040% | | Silicon | 0.15–0.30% | 0.10–0.30% | 0.15–0.35% | 0.15–0.35% | | Boron | – | 0.0005–0.003% | – | 0.0005–0.003% | | Alloying Elements | – | – | * | * | ### Recommended Hardware For nuts and washers compatible with A325 heavy hex structural bolts, consider the following: - **Nuts**: A194 Grade 2H (a suitable alternative) - **Washers**: F436-1 and F436-3 For a complete list of nut and washer specifications, consult the ASTM A563 Nut Compatibility Chart. --- Let me know if you'd like this tailored for a specific audience or format.

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