· Product Overview

· Core Specifications

• Material: 4140 Alloy Steel (Quenched & Tempered)Offers high tensile strength (≥800 MPa), hardness (HRC 45–50), and fatigue resistance for high-load positioning scenarios.
• Manufacturing Standard: ISO 9001-Certified Precision CNC Machining & Heat Treatment
  • Key Processes: CNC turning (cylindrical body + end bore) → Thread rolling (external precision threads) → Quenching & tempering (hardness enhancement) → Black oxide surface treatment (rust protection).
  • Key Parameters:
    • Thread Specification: Metric (M5–M8; customizable to UNC standards)
    • Standard Length: 20mm (customizable 15–30mm)
    • Dimensional Tolerance: ±0.01mm (ensures tight fit in component holes)
  • Surface Finish: Black oxide (5–8μm thickness; provides 48-hour salt spray corrosion resistance).

· Application Scenarios

• Mold & Die Manufacturing: Positioning mold plates, core components, and die inserts to ensure consistent part quality.
• Industrial Automation: Robotic arm joint alignment, conveyor system part positioning, and actuator component fastening.
• Mechanical Equipment: Axle-to-gear positioning, bearing housing alignment, and small machinery component locking.
• Precision Fixtures: Workshop jig part positioning, inspection tool component alignment, and production line fixture fastening.
• Automotive Components: Small-scale transmission part alignment and interior trim mechanical component positioning.

· Production Process Introduction

1. Raw Material Sourcing: Procure 4140 alloy steel bars (metallurgically tested for strength and machinability).
2. CNC Turning: Machine the cylindrical body and end bore to exact dimensional specifications via precision CNC lathes.
3. Thread Rolling: Use precision dies to form uniform external threads (preserves material integrity better than cutting).
4. Heat Treatment: Quench and temper the pins to achieve target hardness (HRC 45–50) and load resistance.
5. Surface Treatment: Apply black oxide coating to enhance rust resistance and wear durability.
6. Quality Inspection: Conduct CMM (Coordinate Measuring Machine) scans (dimensional accuracy) + hardness testing + thread gauge verification.
7. Packaging Prep: Sort pins by thread size/length for organized inventory.

· Packaging and Shipping Methods

• Packaging: Individual pins are sealed in anti-scratch plastic bags; bulk orders are packed in foam-lined partitioned boxes (prevents thread damage and deformation during transit).
• Shipping: Flexible logistics options:
  • Express Delivery (DHL/FedEx/UPS: 3–5 business days)
  • Air Freight (7–10 business days)
  • Sea Freight (20–30 business days)All shipments include full tracking and damage insurance.

· Process

· Frequently Asked Questions (FAQ)

• MOQ (Minimum Order Quantity): 1,000 pieces per thread/size specification; small sample packs (50–100 pieces) are available for fit testing.
• Lead Time: Standard lead time is 7–12 working days after order confirmation; expedited production (5–7 working days) is available for urgent orders (additional fees apply).
• Customization Capability: Full customization is supported—we can adjust pin length, thread type (Metric/UNC), material (e.g., 304 stainless steel), or surface finish (e.g., zinc plating) based on your technical drawings. Our engineering team will validate design feasibility for positioning performance.