14 Hex Bolt – Industrial-Grade Fasteners for Heavy-Duty Applications
1. Product Overview
Our 14 hex bolt is a precision-engineered fastener designed for high-stress industrial environments. Manufactured from premium alloy steel and available in multiple grades (8.8, 10.9, and 12.9), this bolt delivers exceptional tensile strength and fatigue resistance. The hexagonal head profile allows for reliable torque application using standard wrenches or socket tools, making it a staple in construction, machinery assembly, and infrastructure projects. Each bolt undergoes rigorous quality control to ensure consistent thread pitch, chamfer dimensions, and surface finish. Whether you need a standard zinc-plated finish or hot-dip galvanization for corrosive environments, our 14 hex bolt meets ASTM A325, A490, and ISO 898-1 standards.
2. Key Features
- High Shear Strength: Engineered to withstand extreme loads without deformation, with minimum tensile strength ranging from 800 MPa (Grade 8.8) to 1,200 MPa (Grade 12.9).
- Corrosion Resistance: Available in zinc plating, yellow zinc, dacromet, and HDG (hot-dip galvanized) coatings for long service life in outdoor or marine environments.
- Precision Threading: Fully rolled threads per ASME B1.1 (UNC/UNF) or ISO metric standards ensure smooth engagement and consistent clamping force.
- Temperature Tolerance: Suitable for operating temperatures from -50°C to +300°C (depending on coating and material grade).
- Fatigue Performance: Optimized head-to-shank transition radius reduces stress concentration points, tested over 10 million cycles per ISO 3800.
3. Technical Specifications
| Parameter | Specification |
|---|---|
| Bolt Size | 14 mm (M14) or 1/2” (UNC 1/2-13) |
| Thread Pitch | 2.0 mm (Coarse) / 1.5 mm (Fine) / 13 TPI (UNC) |
| Head Type | Hexagonal – ANSI/ASME B18.2.1 or DIN 933/931 |
| Grade Options | 8.8 / 10.9 / 12.9 (Carbon & Alloy Steel) |
| Surface Treatment | Plain / Zinc / Yellow Zinc / Dacromet / HDG / Black Oxide |
| Length Range | 30 mm – 300 mm (1.5” – 12”) |
| Tensile Strength (Grade 10.9) | 1,040 – 1,220 MPa |
| Hardness (Grade 10.9) | 32 – 39 HRC |
| Standards | ASTM A325 / A490 / ISO 898-1 / DIN 933 |
4. Application Scenarios
Our 14 hex bolt is specified across multiple heavy industries where joint integrity cannot be compromised:
- Steel Structure Construction: Used in bolted beam-to-column connections, bracing systems, and crane rails. Grade 10.9 bolts are preferred for high-rise buildings and bridge trusses.
- Wind Energy Towers: M14 hex bolts secure flange joints in wind turbine towers, requiring certified fatigue resistance and corrosion protection.
- Mining & Quarrying Equipment: Rock crushers, conveyors, and screening machines demand bolts that resist vibration loosening—our 14 hex bolt with nylon insert lock nuts provides a reliable solution.
- Agricultural Machinery: Tractors, harvesters, and irrigation systems benefit from zinc-flake coated bolts that withstand UV exposure and moisture.
- Automotive & Heavy Vehicle Assembly: Engine mounts, chassis brackets, and suspension components are secured using grade 12.9 metric hex bolts for maximum clamping force.
5. Advantages
- Certified Traceability: Each production batch includes a material test certificate (MTC) with heat number, chemical composition, and mechanical test results.
- Dimensional Consistency: Our CNC thread rolling process ensures thread tolerance class 6g (metric) or 2A (UNC), reducing assembly rework.
- Custom Lengths & Coatings: We offer shearing, drilling, and custom coating services for non-standard 14 hex bolt requirements.
- Packaging Flexibility: Bulk cartons (25kg/50kg), poly bags, or blister packs with private labeling available for OEM/ODM orders.
- Global Logistics: Inventory hubs in Shanghai, Hamburg, and Houston enable 7–15 day delivery for standard sizes.
6. Why Choose Us
We are a Tier-1 fastener manufacturer with 18 years of export experience, serving clients from 40+ countries. Our 14 hex bolt production line uses fully automated cold-forging machines with in-line laser inspection. We hold ISO 9001:2015 and IATF 16949 certifications, ensuring every bolt meets automotive-grade quality standards. Our engineering team provides free technical support for joint design calculations and torque specifications. With a minimum order quantity of just 500 pieces for standard sizes, we accommodate both prototype runs and mass production contracts.
7. FAQ
Q: What is the torque specification for a Grade 10.9 14 hex bolt?
A: For a dry M14 x 2.0 Grade 10.9 bolt, the recommended tightening torque is 150–170 N·m (110–125 ft·lb). Lubricated threads reduce torque by 20–30%. Always consult your engineer for joint-specific values.
Q: Can these bolts be used in underwater applications?
A: Yes, when specified with hot-dip galvanization (HDG) or duplex coating (zinc + epoxy). For continuous saltwater immersion, we recommend 316 stainless steel hex bolts instead of carbon steel.
Q: Do you provide a tensile test report with each shipment?
A: Yes. Each batch includes a mill certificate with actual tensile, yield, and elongation values. Third-party inspection (SGS, TÜV) can be arranged at cost.
Q: What is the lead time for custom-length 14 hex bolts?
A: Standard lengths ship within 3–5 working days. Custom lengths (non-stock) require 10–15 working days for tooling adjustment and production.
Q: How do I prevent galvanic corrosion when using these bolts with aluminum?
A: Apply a zinc-rich primer or use our Dacromet-coated bolts with a nylon washer isolator. Avoid direct contact between bare steel and aluminum in wet environments.
Q: Are your 14 hex bolts compatible with impact wrenches?
A: Yes. The hex head dimensions (22 mm across flats for M14) are designed for standard impact sockets. For high-speed assembly, we recommend Grade 12.9 bolts with phosphate coating to reduce friction.
