M12x1.25 Locking Conical Seat Wheel Lug Bolts

Product Core Specifications

Detailed Manufacturing Process

We implement meticulous management of every process in the production of M12x1.25 Locking Conical Seat Wheel Lug Bolts to ensure stable mechanical performance.

1. Material and Pre-treatment

Wire Drawing: High-quality alloy steel is selected, and the raw material is transformed into steel wire of a specific diameter using precision wire drawing equipment, laying a solid foundation for subsequent forming.

Wire Heat Treatment: The internal metallographic structure of the steel is adjusted to improve its toughness and plasticity, ensuring that no micro-cracks are generated during the stamping process.

2. Precision Forming Technology

Head Punching: A large cold heading unit is used to stamp the anti-theft irregular head in one go using high-precision molds, ensuring dimensional consistency for each M12x1.25 Locking Conical Seat Wheel Lug Bolt.

Thread Drilling & Rolling: First, a center-positioning drill is performed, followed by a cold thread rolling process. Compared to cutting threads, thread rolling ensures uninterrupted metal fiber movement, significantly improving thread fatigue strength and wear resistance.

3. Strengthening and Protection

Secondary Heat Treatment: This eliminates internal stresses generated during machining, ensuring that M12x1.25 Locking Conical Seat Wheel Lug Bolts reach the predetermined tensile strength grade.

Surface Treatment: We have an automated electroplating production line that can provide salt spray testing standards exceeding 72 hours or even 240 hours, effectively preventing environmental corrosion.

Why Choose Us

Technological and Production Capacity Advantages

Our factory is located in Ningbo, Zhejiang Province, covering an area of over 10 acres and employing more than 100 experienced technical workers.

• Hardware Strength: Equipped with 12 large cold heading machines, over 20 CNC machining centers, and a fully automated electroplating line.
• Management System: Strictly implementing 5S management standards and optimizing production cycle time to ensure an extremely low defect rate for M12x1.25 Locking Conical Seat Wheel Lug Bolts even under high production volumes.

Rigorous Quality Inspection

Each batch of M12x1.25 Locking Conical Seat Wheel Lug Bolts must pass three rigorous laboratory tests before leaving the factory:

1. Hardness Test: Ensuring compliance with 10.9 or 12.9 grade standards.
2. Torque Test: Simulating extreme installation environments to ensure the anti-theft structure does not slip or break.
3. Fatigue Test: Verifying the fastening stability under high-frequency vibration conditions.