ASTM BSW UNC Hex Head Bolts, DIN 933 / DIN 931 Imperial Thread Fasteners
Our ASTM BSW UNC hex head bolts are designed for secure fastening in applications that use imperial thread systems or DIN‑standard bolt structures. The hexagonal head provides convenient installation with standard spanners and sockets, making the bolts suitable for both assembly and maintenance work.
This product range is available in steel and stainless steel material options. Steel bolts offer a practical balance of strength, availability, and cost efficiency, while stainless steel options are suitable for applications where corrosion resistance is a higher priority.
With multiple thread standards, strength grades, diameters, and lengths available, these hex bolts are suitable for wholesalers, distributors, OEM customers, engineering contractors, and industrial buyers.
Key Features
- Supports ASTM, BSW, and UNC thread requirements
- DIN 933 and DIN 931 hex bolt configurations available
- Available grades: 4.8, 8.8, and 10.9
- Steel and stainless steel material options
- Imperial thread sizes for international equipment and repair markets
- Hex head design for efficient tightening and removal
- Suitable for machinery, engineering, construction, and industrial maintenance
- Suitable for bulk purchasing, wholesale, and OEM supply
Product Specifications
| Item | Specification |
|---|---|
| Brand | Hotop Fasteners |
| Origin | Handan, Hebei, China |
| Product Type | Hex Head Bolt |
| Standards | ASTM / BSW / UNC / DIN 933 / DIN 931 |
| Available Grades | 4.8 / 8.8 / 10.9 |
| Material Options | Steel / Stainless Steel |
| Surface Finish | Plain Finish |
| Head Type | Hex Head |
| Thread Options | BSW / UNC |
| Common Sizes | 1/4", 5/16", 3/8", 1/2" |
| Common Lengths | 18 mm / 20 mm |
| Application | Machinery, equipment assembly, construction, maintenance, industrial fastening |
Strength Grade Options
| Grade | Product Performance | Typical Use |
|---|---|---|
| Grade 4.8 | Standard mechanical strength | General hardware, light equipment, routine assembly |
| Grade 8.8 | High tensile fastening strength | Machinery, industrial equipment, structural applications |
| Grade 10.9 | Higher‑strength fastening performance | Heavy‑duty assemblies, equipment connections, demanding projects |
Material Options
Steel Hex Bolts
Steel hex bolts are widely used in industrial fastening because they offer dependable strength, good machinability, and cost‑effective sourcing. They are suitable for machinery production, construction projects, engineering maintenance, and regular hardware distribution.
Stainless Steel Hex Bolts
Stainless steel hex bolts are suitable for applications where improved corrosion resistance is important. They can be selected for humid, outdoor, food‑processing, marine‑adjacent, or general corrosion‑sensitive environments, depending on the required stainless steel grade.
Thread and Standard Options
BSW Thread
BSW, or British Standard Whitworth thread, is commonly used in British‑standard machinery, equipment repair, and legacy industrial applications. It is a practical choice for buyers serving markets where Whitworth thread systems remain in use.
UNC Thread
UNC, or Unified National Coarse thread, is widely used in North American equipment, automotive applications, machinery, and industrial repair work. Its coarse thread form supports practical assembly and maintenance in many common fastening environments.
DIN 933 and DIN 931
| Standard | Bolt Structure | Suitable Use |
|---|---|---|
| DIN 933 | Fully threaded hex head bolt | Suitable for applications requiring thread engagement along the full bolt length |
| DIN 931 | Partially threaded hex head bolt | Suitable for structural assemblies and applications requiring an unthreaded shank section |
Applications
These ASTM BSW UNC hex head bolts are suitable for:
- Industrial machinery
- Construction equipment
- Engineering installation
- Agricultural machinery
- Automotive repair
- Plant maintenance
- Steel structure fastening
- Mechanical assembly
- Equipment replacement parts
- Hardware wholesale and distribution
Packaging and Bulk Supply
Hotop Fasteners supports bulk supply for industrial buyers, distributors, and project customers. Packaging can be arranged according to order requirements, including bulk packing, carton packing, pallet packing, and export‑oriented packaging.
Customized services can be discussed for:
- Required bolt diameter
- Thread standard
- Bolt length
- Strength grade
- Material selection
- Packaging method
- Private‑label or OEM supply
FAQ
Q1: What thread standards are available?
This product range supports BSW and UNC thread options, together with DIN 933 and DIN 931 bolt configurations.
Q2: What strength grades can I choose?
Available strength grades include 4.8, 8.8, and 10.9.
Q3: What materials are available?
Steel and stainless steel options are available according to the required specification.
Q4: What sizes can be supplied?
Common imperial sizes include 1/4 inch, 5/16 inch, 3/8 inch, and 1/2 inch.
Q5: What is the difference between DIN 933 and DIN 931?
DIN 933 is generally a fully threaded hex bolt, while DIN 931 is generally a partially threaded hex bolt.
Q6: Is this bolt suitable for machinery and maintenance work?
Yes. It is suitable for machinery assembly, industrial equipment, repair, construction, and general engineering applications.
Q7: Can Hotop Fasteners support bulk orders?
Yes. Hotop Fasteners supports wholesale, project purchasing, OEM supply, and bulk‑order requirements.
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