Release time：2020-01-16 18:44 Browse：
### 1. **Standards Compliance** - Manufactured to ASME/ANSI specifications for hex flange head bolts, ensuring dimensional accuracy and mechanical performance per B18.2.1 (hex bolts) and B18.2.4.1M (metric flange bolts). ### 2. **Custom Design Features** - **Extended Length**: Available in non-standard lengths exceeding ANSI limits (e.g., up to 1,000mm for metric sizes), ideal for deep assemblies or thick structures. - **Extra Hex Head**: Larger hex drive size relative to shank diameter for enhanced torque transmission and reduced stripping risk. - **Flange Base**: Integral washer face with serrations/trials to prevent rotation and distribute clamping force, minimizing surface damage. ### 3. **Material Options** - Carbon steel (Grade 5/8), alloy steel (4140/42CrMo), or stainless steel (304/316) per ASME SA-325/SA-490 for high-strength applications. - Corrosion-resistant coatings: Zinc plating, Dacromet, or hot-dip galvanizing per ASTM B633/B780. ### 4. **Thread Specifications** - Metric (M10–M100) or imperial (1/2"–4") threads, rolled for 30% higher fatigue strength, with options for full/half thread and custom pitch. - Thread accuracy: 6g (external) per ISO 965-1, compatible with standard nuts and tapped holes. ### 5. **Mechanical Properties** - Tensile strength: Grade 8 bolts ≥1,040 MPa; 316 stainless steel ≥585 MPa, meeting ASME pressure vessel requirements. - Hardness: 29–32 HRC for alloy steel, passivated to 180–210 HV for stainless steel. ### 6. **Manufacturing Capabilities** - Forging/hot-rolling for large diameters, cold-heading for precision small parts, with CNC machining for custom head dimensions (e.g., increased flange OD/height). - Custom tooling for non-standard head shapes, thread reliefs, or special coatings. ### 7. **Quality Control** - 100% thread gauging (GO/NO-GO), magnetic particle inspection (MPI) for cracks, and tensile testing per ASME Section VIII. - Traceability: Laser-engraved batch codes, material test reports (MTRs) compliant with API 6A for oil & gas applications. ### 8. **Applications** - Heavy machinery: Wind turbine tower connections, press frames, or industrial equipment requiring long-span fastening. - Construction: Bridge joints, structural steel assemblies, and precast concrete connections. - Oil & gas: Pipeline flanges, pressure vessels, and offshore platforms with extended bolt lengths. ### 9. **Installation Advantages** - Reduced need for spacers/washers due to extended shank, streamlining assembly in multi-layered structures. - Flange design minimizes torque loss, ensuring uniform preload in high-vibration environments (e.g., engines, pumps). ### 10. **Customization Options** - Special head markings (company logo, part numbers), non-standard thread lengths, or anti-seize lubrication applied at factory. - Engineering support for load analysis, torque-tension calculations, and CAD model provision.
