Strictly speaking, the correct English term for "美制六角螺栓" is Hex Head Screw. However, in many countries and regions, people also commonly refer to it as Hex Head Bolt when describing American standard hex head screws.
If you would like to understand the difference between a Hex Head Screw and a Hex Head Bolt, please refer to the image below.
Hex Head Screw: Typically used in conjunction with pre-threaded holes; certain standards impose stricter requirements regarding tolerances and thread forms.
Hex Head Bolt: Typically used in conjunction with a nut, connecting components by passing through a clearance hole.
In practice, many buyers and suppliers use the terms interchangeably in international trade.
| Item | Hex Head Screw | Hex Head Bolt |
|---|---|---|
| Installation | Threaded hole or nut | Usually with nut |
| Common Usage | Machinery, equipment | Structural fastening |
| Industry Naming | Technical term | Commercial term |
The dimensional standards for Hex Head Screw products are mainly based on ASME specifications. At Meigesi Fastener, our core American standard product range includes bolts, nuts, washers, and threaded rods.
Below is an overview of the standard American fasteners we currently supply.
| Product Type | Standard |
|---|---|
| Bolt | ASME B 18.2.1 Hex Head Screw, Grade 2 |
| Bolt | ASME B 18.2.1 Hex Head Screw, Grade 5 |
| Bolt | ASME B 18.2.1 Hex Head Screw, Grade 8 |
| Bolt | ASME B 18.2.6M Heavy duty Hex Bolt, A325M |
| Bolt | ASME B 18.5 Round Head Carriage Bolt, Grade 2 |
| Bolt | ASME B18.5 Round Head Carriage Bolt, Grade 5 |
| Nut | ASME B 18.16.6, PA6, Grade 2 |
| Nut | ASME B 18.2.2 American Hex Flange Nut, Grade 2 |
| Nut | ASME B 18.2.2 American Hex Nut, Grade 2 |
| Nut | ASME B 18.2.2 American Hex Nut, Grade 5 |
| Nut | ASME B18.2.6M, A563M Class10 |
| Nut | ASME B 18.2.6, A563, Grade D |
| Nut | ASME B 18.2.6, Gr.2H |
| Washer | ASME B18.2.6, ASTMF436 |
| Washer | ASME B 18.21.1 Flat Washer-Type A, N |
| Washer | ASME B 18.21.1 Flat Washer-Type A, W |
| Thread Rod | ASME B 18.31.3 Thread Rod, Grade 2 |
| Thread Rod | ASME B 18.31.3 Thread Rod, Grade 5 |
| Thread Rod | ASME B 18.31.3 Thread Rod, Gr B7 |
In addition, due to manufacturing considerations, for Carriage Bolts under 6 inches, we currently produce fully threaded versions only. For Carriage Bolts over 6 inches, customers can choose between fully threaded or partially threaded options based on project requirements.
At Meigesi Fastener, we are committed to providing high-quality American standard fasteners that meet ASME specifications. Whether you are looking for Hex Head Screws, Hex Head Bolts, nuts, washers, or threaded rods, we offer a wide range of grades, materials, and sizes to suit various applications.
If you are looking for reliable U.S. standard fasteners or need guidance on selecting the most suitable products for your applications, Meigesi Fastener is here to help. Contact us today to discuss your specific requirements and explore our full product range.
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