Specification of Heavy Hex Structural Bolt:
1. Types: 1, 2, 3, T, M
2. Connection types: SC, N, X
3. Minimum order quantity: 10, 000 pieces

4. Grade: ASTM A325, ASTM A490

Specification of ASTM A325 Heavy Hex Structural Bolt:
1. Types:

2. Connection Types:

3. Chemical Properties:


Recommended Nuts and Washers:

 Specification of ASTM A490 Heavy Hex Structural Bolt:
1. Types:

2. Connection Types:


3. Mechanical Properties: 


4. Chemical Properties：

Notes:
1. The bolts shall not be coated by hot-dip zinc coating, mechanical deposition, or electroplating with zinc due to the potential for hydrogen embrittlement. ASTM has approved coating A490 bolts with Zinc/Aluminum Corrosion Protective Coatings per ASTM F1136 Grade 3, commercially called dacromet. Read more about issues with galvanizing ASTM A490.
2. Each sample representative of the lot shall be magnetic particle inspected for longitudinal discontinuities and transverse cracks.