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Hex Nut Screw
QS Fastener: Hex Nut Screw
Name: Hex Nut Screw ANSI B18.2.2
Type: Heavy Hex
Size: 1/2"-4"
Thread: UNC
Standard: ANSI B18.2.2
Material: Material A194 2H/ A194 Gr.8 etc
Surface Treatment: Zinc / Xylan / Plain Color
Type: Heavy Hex
Size: 1/2"-4"
Thread: UNC
Standard: ANSI B18.2.2
Material: Material A194 2H/ A194 Gr.8 etc
Surface Treatment: Zinc / Xylan / Plain Color
Quantity
Hex Nut Screw complies with ANSI B18.2.2 standard, available in full-size range from 1/2"to 4"with UNC coarse threads for superior compatibility. Manufactured from high-strength alloy steels such as A194 2H/Gr.8 to ensure robustness and durability. Surface options include zinc plating, Xylan coating, or plain finish to meet diverse anti-corrosion requirements. Suitable for heavy-duty applications in petroleum, chemical, and steel structures, delivering reliable fastening performance.
Cold Heading is the core manufacturing process for Hex Nut Screw (heavy hex nuts). It involves plastic deformation of metal wire under high pressure at room temperature using multi-station cold heading machines to directly form nut blanks. Compared to machining or hot forging, cold heading offers significant advantages: high material utilization (over 95%), high production efficiency (80–120 pieces/minute), and superior mechanical properties (intact fiber flow lines), making it ideal for mass production of high-precision Hex Nut Screw.
1. Equipment and Station Configuration
Equipment Selection
- Leading brands:
- National (Japan): Specializes in high-volume production of high-precision Hex Nut Screw (e.g., NH-2080 model with 2000-ton max heading force).
- Sacma (Italy): Multi-station synchronized design (e.g., SACMA 660 with 6 forming stages), suitable for complex Hex Nut Screw structures.
Equipment Selection
- Leading brands:
- National (Japan): Specializes in high-volume production of high-precision Hex Nut Screw (e.g., NH-2080 model with 2000-ton max heading force).
- Sacma (Italy): Multi-station synchronized design (e.g., SACMA 660 with 6 forming stages), suitable for complex Hex Nut Screw structures.
- Key parameters:
- Heading speed: 200–300 strokes/minute (ensures high output of Hex Nut Screw).
- Feed accuracy: ±0.05mm (servo-driven for dimensional consistency).
- Heading speed: 200–300 strokes/minute (ensures high output of Hex Nut Screw).
- Feed accuracy: ±0.05mm (servo-driven for dimensional consistency).
Station Functions
| Station | Description | Tooling Type |
| 1 | Wire cutting (blank for Hex Nut Screw) | Shear die |
| 2 | Pre-forming | Tapered punch |
| 3 | Hex outer diameter forming (critical for Hex Nut Screw) | Split die |
| 4 | Piercing (center hole) | Back extrusion punch |
| 5–6 | Finishing/chamfering (improves Hex Nut Screw surface finish) | Compound die |
2. Technical Highlights of Forming Process
Material Preparation
- Wire requires zinc phosphate coating and soaping (friction coefficient μ ≤ 0.1) to ensure stable Hex Nut Screw forming.
- Diameter tolerance: ±0.02mm (e.g., Φ20mm wire per ASTM A510 standard).
Material Preparation
- Wire requires zinc phosphate coating and soaping (friction coefficient μ ≤ 0.1) to ensure stable Hex Nut Screw forming.
- Diameter tolerance: ±0.02mm (e.g., Φ20mm wire per ASTM A510 standard).
Multi-Stage Deformation Control
- Deformation rate: ≤30% per pass (prevents cracking in Hex Nut Screw), total deformation up to 75%.
- Example: Medium-carbon steel (σb=600MPa) for Hex Nut Screw (Φ24mm) requires ~1200-ton heading force.
- Deformation rate: ≤30% per pass (prevents cracking in Hex Nut Screw), total deformation up to 75%.
- Example: Medium-carbon steel (σb=600MPa) for Hex Nut Screw (Φ24mm) requires ~1200-ton heading force.
Die Design and Lifespan
- Material: Tungsten carbide (YG15) or powder high-speed steel (ASP-23), hardness HRC 62–65.
- Cooling/lubrication: Water-based emulsion (with EP additives), 0.3–0.5MPa spray pressure.
- Lifespan: Avg. 500,000 cycles/set (up to 1M after regrinding).
- Material: Tungsten carbide (YG15) or powder high-speed steel (ASP-23), hardness HRC 62–65.
- Cooling/lubrication: Water-based emulsion (with EP additives), 0.3–0.5MPa spray pressure.
- Lifespan: Avg. 500,000 cycles/set (up to 1M after regrinding).
3. Hex Nut Screw Dimensional Accuracy
Thread Accuracy (Class 2B, ANSI B1.1)
Thread Accuracy (Class 2B, ANSI B1.1)
- Pitch diameter tolerance:
| Size (inch) | Tolerance (mm) |
| 1/2" | +0.003/–0.000 |
| 1" | +0.004/–0.000 |
- Inspection: GO/NO-GO gauges or optical projector (±0.002mm).
Width Across Flats (±0.5%)
- Example: Hex Nut Screw M24 (36mm standard width) allows ±0.18mm deviation.
- Control measures:
- Die temperature control (20±2°C).
- In-line laser measurement.
- Example: Hex Nut Screw M24 (36mm standard width) allows ±0.18mm deviation.
- Control measures:
- Die temperature control (20±2°C).
- In-line laser measurement.
Coaxiality and Perpendicularity
- Thread axis-to-face perpendicularity ≤0.05mm/100mm (ISO 4759-1).
- Thread axis-to-face perpendicularity ≤0.05mm/100mm (ISO 4759-1).
4. Hex Nut Screw Production Pros and Cons
Advantages
- Energy savings: 40% vs. hot forging (no heating).
- Strength: Cold working increases Hex Nut Screw surface hardness by 10–15%.
Advantages
- Energy savings: 40% vs. hot forging (no heating).
- Strength: Cold working increases Hex Nut Screw surface hardness by 10–15%.
Limitations
- Material constraints: Only suitable for medium/low-carbon steels (e.g., 35K, ML35). High-carbon Hex Nut Screw requires hot forging.
- Tooling cost: ≥¥20,000/set for complex dies (uneconomical for small batches).
- Material constraints: Only suitable for medium/low-carbon steels (e.g., 35K, ML35). High-carbon Hex Nut Screw requires hot forging.
- Tooling cost: ≥¥20,000/set for complex dies (uneconomical for small batches).
5. Industry Applications
- Automotive chassis Hex Nut Screw: 5-station cold heading (with flange), 120 PPM.
- Wind turbine bolt Hex Nut Screw: Width tolerance tightened to ±0.3% (custom die compensation).
- Automotive chassis Hex Nut Screw: 5-station cold heading (with flange), 120 PPM.
- Wind turbine bolt Hex Nut Screw: Width tolerance tightened to ±0.3% (custom die compensation).
Summary: Cold heading enables efficient, high-precision Hex Nut Screw production through advanced tooling and dynamic equipment. Real-world production requires continuous optimization of material properties, die wear data, and in-process inspection to meet industry-specific demands.
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