Ningbo Fenghua Bolong Machinery Manufacturing Co., Ltd. is one of the leading manufacturers and suppliers of thread machining in China. Please feel free to buy durable thread machining made in China here from our factory. All customized products are with high quality and competitive price.
Threading Capabilities
|
Process |
Thread Types |
Key Features |
|
Thread Rolling |
External threads (bolts, studs, fasteners) |
Cold-forming process - no material removal, stronger threads due to work hardening and compressive residual stress |
|
Thread Milling |
Internal/external, left/right-hand, custom pitches |
Single tool cuts multiple thread sizes, safer than tapping, excellent for large diameters and tough materials |
|
Thread Cutting |
Internal/external threads |
Conventional turning on CNC lathes, standard production runs |
|
CNC Thread Grinding |
High-precision threads, ball screws, thread gauges |
Rigid grinding for hardened materials, critical for sub-6H/6g tolerance applications |
|
Diameter Range: Φ2–200mm |
Length Range: 3–300mm |
Tolerances: Internal 6H, External 6g |
Process Specifications
|
Parameter |
Value |
|
Equipment |
CNC lathes, thread milling machines, thread rolling machines, thread grinding machines |
|
Diameter Range |
Φ2mm – Φ200mm |
|
Length Range |
3mm – 300mm |
|
Internal Thread Tolerance |
6H |
|
External Thread Tolerance |
6g |
|
Materials |
45#, 20# carbon steel; 6061, 6063 aluminum alloy; 304 stainless steel |
|
Certifications |
IATF 16949, ISO 14001, ISO 45001, IECQ QC080000 |
Performance Highlights
Thread rolling for maximum strength
Cold-forming displaces material to create thread profiles rather than cutting them. Rolling produces work-hardened surfaces with compressive residual stress, delivering higher fatigue strength than cut threads. Material savings of 15–20% versus cutting, with no chips or swarf.
Thread milling for flexibility and safety
Unlike tapping, thread milling tools are smaller than the hole diameter and move in a helical path to cut threads. Advantages include: single tool cuts multiple thread sizes, no risk of broken tap stuck in the part, ideal for large diameters (3/4" and above), and works well in tough materials.
Precision grinding for critical threads
Thread grinding produces the highest accuracy threads for hardened materials, including ball screws, thread gauges, and worm shafts. Closed-loop positional feedback ensures pitch diameter stability.
Multi-material capability
We process 45#/20# carbon steels, 6061/6063 aluminum alloys, and 304 stainless steel. Each material is thread-machined with optimized tools and parameters for the required tolerance (6H internal, 6g external).
Comprehensive threading options
From high-volume rolled external threads to precision-milled internal threads and ground threads for critical applications, we provide the full spectrum of thread manufacturing.
IATF 16949-certified facility
Full PPAP Level 3 documentation available - process FMEA, control plans, capability studies - prepared to the same standard we apply to Tier 1 automotive customers.
Quality Control
Applications
Thread Rolling for Fasteners and Studs
Bolts, screws, studs, and threaded pins for automotive and industrial assemblies are produced through thread rolling. The cold-forming process delivers superior fatigue strength and 15–20% material savings compared to cutting.
Thread Milling for Complex Components
Valve bodies, manifold ports, and structural components require internal threads with precise positional accuracy. Thread milling produces threads in single setups, eliminating the risk of tap breakage and allowing for custom thread sizes.
Internal Threads for Hydraulic Systems
Hydraulic valve bodies and pump components require 6H internal threads with consistent lead and flank angles. Thread milling and CNC cutting deliver the required accuracy.
Precision Ground Threads for High-Stress Applications
Ball screws, thread gauges, and critical power transmission components are thread-ground to achieve the highest accuracy and surface finish standards.
Beyond Automotive
|
Sector |
Typical Components |
Key Requirements |
|
Aerospace |
Ball screws, threaded shafts, fasteners |
Ultra-precision, material traceability, 6H/6g |
|
Medical |
Surgical instruments, implant components |
Precision, surface finish, biocompatible materials |
|
Industrial Equipment |
Valve bodies, hydraulic fittings, manifold ports |
Pressure integrity, thread accuracy, corrosion resistance |
|
Energy / Power |
Threaded shafts, drivetrain components |
Fatigue strength, durability, high-volume output |
Why Thread Machining
Multiple threading methods exist - each suited to different requirements:
Thread rolling – cold-formed, highest strength, material-efficient, ideal for high-volume fasteners
Thread milling – highest flexibility, single tool handles multiple sizes, eliminates tap breakage risk, ideal for large diameters and tough materials
Thread cutting – conventional turning, standard specifications, cost-effective for medium to low volumes
Thread grinding – highest precision, ideal for hardened materials and critical applications
For threaded connections - whether high-strength rolled threads, flexible milled threads, or ultra-precision ground threads - thread machining is the production method.
Contact Us for Your New Project
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