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Suzhou Hex Bolt
QS Fastener: Suzhou Hex Bolt
Name: Suzhou Hex Bolt
Standard: ANSI B18.2.1
Material: 304
Size: 1/4-20
Lenght: 3/8 inch
Surface: Natural color
Standard: ANSI B18.2.1
Material: 304
Size: 1/4-20
Lenght: 3/8 inch
Surface: Natural color
Quantity
Suzhou Hex Bolt, 1/4-20 X 3/8"fully threaded, made of premium 304 stainless steel, combines high strength with corrosion resistance. The 3/8"length design suits diverse industrial and mechanical assembly applications. With a natural surface finish that retains the metal's original appearance, it meets stringent ANSI standards, offering a reliable connection solution.
Cold Heading: Core Manufacturing Process for 304 Stainless Steel Suzhou Hex Bolt
Cold heading is a high-speed forming process where stainless steel wire is plastically deformed under high pressure at room temperature to shape the bolt's hex head and shank. This method ensures high efficiency, precision, and material utilization, making it the preferred choice for mass-producing ANSI B18.2.1 Hex Bolt.
Cold heading is a high-speed forming process where stainless steel wire is plastically deformed under high pressure at room temperature to shape the bolt's hex head and shank. This method ensures high efficiency, precision, and material utilization, making it the preferred choice for mass-producing ANSI B18.2.1 Hex Bolt.
1. Material Preparation
- Wire selection: AISI 304 stainless steel coil with diameter matching the ANSI B18.2.1 Hex Bolt specification (e.g., Φ5.8mm wire for M6 bolts).
- Wire selection: AISI 304 stainless steel coil with diameter matching the ANSI B18.2.1 Hex Bolt specification (e.g., Φ5.8mm wire for M6 bolts).
- Pre-treatment:
- Annealing: Softens wire (HRB≤85) to prevent cracking during cold heading.
- Pickling: Enhances surface cleanliness and extends die life.
- Lubrication: Phosphate or saponification coating ensures smooth forming of Suzhou Hex Bolt.
- Annealing: Softens wire (HRB≤85) to prevent cracking during cold heading.
- Pickling: Enhances surface cleanliness and extends die life.
- Lubrication: Phosphate or saponification coating ensures smooth forming of Suzhou Hex Bolt.
2. Cold Heading Equipment and Dies
- Machine type: Multi-station high-speed cold header (5–6 stations), specialized for high-volume production of Suzhou Hex Bolt (100–300 pieces/minute).
- Die system:
- Pre-forming die: Creates head preform to reduce stress concentration.
- Finishing die: Precisely forms the hex head (across-flats tolerance ±0.1mm).
- Cutting die: Shears wire to define shank length.
- Machine type: Multi-station high-speed cold header (5–6 stations), specialized for high-volume production of Suzhou Hex Bolt (100–300 pieces/minute).
- Die system:
- Pre-forming die: Creates head preform to reduce stress concentration.
- Finishing die: Precisely forms the hex head (across-flats tolerance ±0.1mm).
- Cutting die: Shears wire to define shank length.
- Die material: Tungsten carbide (YG8) or powder high-speed steel (HRC 60–65) ensures dimensional stability of ANSI B18.2.1 Hex Bolt.
3. Cold Heading Process Steps
1) Cutting: Wire sheared to specified length (e.g., ~20mm for M6 bolts).
1) Cutting: Wire sheared to specified length (e.g., ~20mm for M6 bolts).
2) Head upsetting:
- Pre-forming die creates head profile with ≤70% deformation (304 stainless steel limit: 80%).
- Pre-forming die creates head profile with ≤70% deformation (304 stainless steel limit: 80%).
3) Hex head finishing:
- Finishing die applies 200–800 tons pressure to form standard hex head (e.g., M6: 10mm±0.2mm across flats).
4) Shank forming: Unthreaded shank diameter slightly smaller than thread major diameter (e.g., M6 shank: Φ5.8mm).
- Finishing die applies 200–800 tons pressure to form standard hex head (e.g., M6: 10mm±0.2mm across flats).
4) Shank forming: Unthreaded shank diameter slightly smaller than thread major diameter (e.g., M6 shank: Φ5.8mm).
4. Key Process Controls
- Force calculation:
- Formula: ( F = sigma times A ) (304 stainless steel σ=1000–1200 MPa).
- Example: M10 ANSI B18.2.1 Hex Bolt requires ~500 tons pressure.
- Force calculation:
- Formula: ( F = sigma times A ) (304 stainless steel σ=1000–1200 MPa).
- Example: M10 ANSI B18.2.1 Hex Bolt requires ~500 tons pressure.
- Lubrication: Extreme-pressure lubricant (MoS₂-based) prevents die adhesion.
- Temperature: Die cooling maintains temperature below 300°C.
5. Advantages and Limitations
- Advantages:
- Material utilization >95%; surface roughness Ra≤1.6μm for ANSI B18.2.1 Hex Bolt.
- Work hardening increases head hardness by 10–15%.
- Advantages:
- Material utilization >95%; surface roughness Ra≤1.6μm for ANSI B18.2.1 Hex Bolt.
- Work hardening increases head hardness by 10–15%.
- Limitations:
- Suzhou Hex Bolt above M24 may require hot heading.
- Die life: ~500,000–1 million pieces.
- Suzhou Hex Bolt above M24 may require hot heading.
- Die life: ~500,000–1 million pieces.
6. Quality Inspection
- Dimensional checks: Projector measures ANSI B18.2.1 Hex Bolt across-flats, head height, and coaxiality.
- Dimensional checks: Projector measures ANSI B18.2.1 Hex Bolt across-flats, head height, and coaxiality.
- Defect control:
- Magnetic particle inspection detects cracks; die fillets (R≥0.3mm) prevent folding.
- Magnetic particle inspection detects cracks; die fillets (R≥0.3mm) prevent folding.
Cold heading is the core technology for efficient Suzhou Hex Bolt production, balancing performance and cost-effectiveness.
Suzhou's fastener industry has fully transitioned from traditional standard parts manufacturing to an upgraded stage driven by high-end applications, intelligent manufacturing, and digital platforms. Leveraging the advantages of the Yangtze River Delta's manufacturing cluster, over a thousand local enterprises are not only deeply engaged in high-end specialized fastener fields such as automotive and aerospace, but have also given rise to industrial internet platforms like"Gongpin Yihao,"which reshape industry circulation efficiency through digital supply chain integration. Meanwhile, the emergence of intelligent manufacturing and"specialized and sophisticated"enterprises has further consolidated its competitiveness in shifting from basic processing to high-value-added, high-tech-content segments, making Suzhou a typical model for observing the transformation of China's foundational component industry.
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