Premium JIS Hex Bolt – High-Strength Fasteners for Industrial Applications
1. Product Overview
Our JIS hex bolt range is manufactured in strict compliance with the Japanese Industrial Standards (JIS B 1180). Designed for precision engineering, these hexagonal head bolts offer superior clamping force and dimensional accuracy. Whether you are assembling heavy machinery, automotive components, or structural frameworks, our JIS hex bolts ensure a reliable, vibration-resistant joint. Available in various grades (e.g., 4T, 8T, 10T) and surface finishes, they are the preferred choice for OEMs and maintenance professionals who demand consistency.
2. Key Features
- Precision Dimensional Tolerance: Thread pitch and head dimensions conform strictly to JIS B 1180, ensuring compatibility with standard JIS nuts and washers.
- Superior Tensile Strength: Manufactured from carbon steel, alloy steel, or stainless steel (SUS304/316), with tensile strengths up to 1,000 MPa for grade 10T.
- Corrosion Resistance Options: Available in plain, zinc-plated (yellow/blue), hot-dip galvanized, or Dacromet coating for harsh environments.
- Full Thread or Partial Thread: Customizable thread lengths to meet specific shear and tensile load requirements.
- Consistent Hardness: Heat-treated to achieve uniform core hardness, reducing the risk of brittle fracture under dynamic loads.
3. Technical Specifications
| Parameter | Grade 4T | Grade 8T | Grade 10T |
|---|---|---|---|
| Material | Low/Medium Carbon Steel | Medium Carbon Alloy Steel | Alloy Steel (e.g., SCM435) |
| Tensile Strength (min) | 400 MPa | 800 MPa | 1,000 MPa |
| Yield Strength (min) | 240 MPa | 640 MPa | 900 MPa |
| Hardness (HRC) | – | 22–32 | 32–39 |
| Thread Diameter (M) | M6 – M24 | M6 – M24 | M8 – M20 |
| Surface Finish | Plain / Zinc Plated | Zinc / Black Oxide | Zinc / Dacromet |
| Standard | JIS B 1180 | ||
Note: Custom diameters, lengths, and coatings are available upon request.
4. Application Scenarios
The JIS hex bolt is widely used in industries where Japanese engineering standards are required:
- Automotive & Motorcycle Assembly: Engine mounts, chassis components, and suspension systems.
- Industrial Machinery: Press machines, conveyors, and robotic arms.
- Construction & Structural Steel: Steel frame connections, scaffolding, and bridge components.
- Electronics & Precision Equipment: Enclosures, rack systems, and semiconductor manufacturing tools.
- Shipbuilding & Marine: Deck fittings and engine room fasteners (stainless steel grade).
5. Advantages
- Interchangeability: Full compliance with JIS standards ensures seamless replacement of existing bolts in Japanese-designed equipment.
- Fatigue Resistance: Optimized thread root radius reduces stress concentration, extending service life under cyclic loading.
- Cost Efficiency: High-strength grades reduce the number of bolts required per joint, lowering overall assembly weight and cost.
- Global Certifications: Our JIS hex bolts meet ISO 9001, IATF 16949, and RoHS requirements, facilitating international trade.
6. Why Choose Us
- Dedicated JIS Production Line: We operate separate forging and threading lines exclusively for JIS bolts, ensuring zero cross-contamination with other standards.
- In-House Testing: Every batch undergoes tensile testing, hardness testing, and salt spray testing (48–720 hours) with a detailed COA.
- Global Logistics: Warehouses in China, Vietnam, and Germany enable fast delivery (7–15 days for standard sizes).
- Custom Packaging: Bulk cartons, poly bags with labels, or private labeling for OEM partners.
- Technical Support: Our engineers provide torque specifications and joint design consultation free of charge.
7. FAQ
Q: What is the difference between a JIS hex bolt and a DIN/ISO hex bolt?
A: The primary difference lies in the head height, thread length, and underhead radius. JIS bolts typically have a slightly smaller head height compared to DIN 933/931, and the thread length proportion differs. Always use a JIS hex bolt for Japanese-origin equipment to avoid fitment issues.
Q: Can you supply JIS hex bolts with a black oxide finish?
A: Yes. We offer black oxide (blackening) for grade 8T and 10T bolts. Please specify the required coating during order placement.
Q: What is the standard packaging for export orders?
A: Standard export packaging includes 25–50 kg woven bags or cartons, with palletization and stretch wrapping for container loading. Small quantities can be packed in poly bags with barcode labels.
Q: Do you provide a Material Test Certificate (MTC)?
A: Absolutely. An EN 10204 3.1 MTC is included with every shipment. Third-party inspection (SGS, TÜV) is available at an additional cost.
Q: What is the minimum order quantity (MOQ) for JIS hex bolts?
A: For common sizes (M8–M16) and standard coatings, the MOQ is 1,000 pieces per size. For special grades or non-standard lengths, the MOQ is 5,000 pieces.
For a quotation or technical drawing, please contact our sales team with your required grade, size, quantity, and target delivery date.
