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Manufactured from high-strength alloy steels including 42CrMo and 40Cr
CNC machining ensures tight control over internal thread precision, coaxiality, and locking surface flatness, with thread tolerances above Grade 6H
Capable of machining blind-hole nuts, flange nuts, lock nuts (with clamping grooves / nylon ring grooves), and locating step nuts to meet high-strength assembly requirements for engines and chassis
Surface treatments include blackening, galvanizing, or phosphating to enhance corrosion resistance and fatigue performance
Stable locking force, anti-vibration and anti-loosening performance; no loosening or thread stripping during long-term driving (high-speed & bumpy road conditions)
Maintains strength in high-temperature and oil-contaminated environments, suitable for high-temperature working conditions in the engine compartment
Internal threads are resistant to damage during maintenance and disassembly, with durability and safety far superior to ordinary turned nuts, reducing vehicle maintenance costs and ensuring driving safety
Common CNC Machining Issues & Key Points
Heat Treatment Deformation
High-strength alloy steels require quenching and tempering after machining, which may cause dimensional deformation and internal thread shrinkage
Machining allowances must be reserved before heat treatment, followed by precision turning and tapping afterward to correct internal thread dimensions and guarantee accuracy
Blind-Hole Machining
Blind-hole nuts for gearboxes and brake systems are prone to chip accumulation at the hole bottom and incomplete internal threading
Taps with excellent chip removal performance should be used, and chips must be cleaned regularly during processing to prevent thread scoring and ensure full-length threading
Flange Surface Machining
Unqualified flatness of flange nuts causes uneven locking force and loosening
CNC milling speed must be controlled, and face milling cutters used for finish milling
Flange flatness is inspected after processing to avoid warping and ensure tight contact with mating surfaces
Batch Consistency
Automotive components require mass production, which can lead to variations in internal thread dimensions and profiles between batches
CNC equipment must be calibrated regularly and tapping parameters optimized
Sampling inspection using go/no-go gauges is performed per batch to ensure consistency for automated assembly
We have introduced advanced equipment and technology from Japan and Germany (CNC 5-axis and 6-axis machines) to better serve our customers' needs.
Technical Specifications
Maximum processing outer diameter: 60
Minimum control tolerance: 0.001
Equipment includes: Japanese CNC Tsugami, CNC Citizen, multi-station cold extrusion forming machines, 500T press machines, casting equipment, and various process equipment
Company Overview
Total employees: 300
Technical staff: 20 technicians, 10 engineers, 15 quality control personnel
Equipment: Over 300 pieces
Management system: 8S management
Certifications: ISO9001 and TS16949 automotive certifications
Major customers include: bo-sch, Foxconn, Motors, Husqvarna, Shimano, NVIDIA, DJI Drones, Siegenia, and Cater-pillar
Our Capacity
Main Products
Stainless steel screws, carbon steel screws, pins, rivets, nuts, eccentric nails, embedded parts, and other fasteners
Business Type
Factory / Manufacturer
Services
CNC Machining, Turning and Milling, CNC Turning, Cold heading, Stamping, Assembly Service
