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Ningbo Renjiu Machinery is a one-stop CNC machining supplier for global B2B buyers: 3/4-axis milling and CNC turning, tolerances down to ±0.1 mm, aluminum, stainless steel, brass and engineering plastics, plus a full range of surface finishes. Upload your drawings and receive a detailed quotation within 24 hours.
Send STEP, IGS, STP, DWG or PDF files — our engineers review manufacturability, suggest cost-saving design options, and return a detailed quotation within one working day. Every project is NDA protected.
From 1 piece to 100,000+ pieces with consistent quality: ±0.1 mm standard tolerances (±0.02 mm achievable), CMM inspection reports with every shipment, and in-house anodizing, plating, powder coating and laser marking.
What We Do
From single prototypes to mass production, we machine metal and plastic parts strictly to your drawings and 3D models — with material certificates and full dimensional reports on request.
Complex prismatic parts up to 1,000 × 500 mm, from one-off prototypes to stable volume runs with consistent quality.
Shafts, bushings, fittings and threaded parts from Ø0.5 to 300 mm, with live tooling for mill-turn parts.
±0.1 mm as standard; ±0.02 mm achievable on critical dimensions, verified by CMM reports.
6061, 6063, 7075, 5052 and die-cast A380 aluminum, from raw stock to finished anodized components.
1018/1045 carbon steel, 303/304/316 stainless steel and 4140 alloy steel, with passivation on request.
Free-cutting brass C36000, copper and bronze fittings turned and milled with a fine surface finish.
POM (Delrin), PEEK, PTFE, nylon, ABS and MC nylon for insulating, lightweight and wear-resistant parts.
Flexible quantities from 1 piece to 100,000+ pieces, with 3–7 day lead times on most prototype orders.
Who We Serve
Our machined parts are working inside equipment built by automation integrators, pump and filtration manufacturers, and industrial brands across Europe, North America and Australia.
Jigs, fixtures, frames and motion components for assembly lines, test rigs and robotic work cells.
Impellers, valve bodies, filter housings and seal components machined to drawing for fluid systems.
Brackets, sensor housings and powertrain parts in aluminum and steel for vehicles and charging equipment.
Small-batch stainless steel and engineering plastic parts with full material traceability.
Joint housings, camera mounts and precision linkages for industrial robots and vision systems.
High-strength aluminum and specialty alloy components for demanding structural applications.
Recent Work
A selection of parts we produce every week. Send us a similar drawing and we will match the process to your budget and timeline.
6061-T6 · 3-axis milling · anodizing
Stainless steel · turning + milling · passivation
Carbon steel · CNC milling · black oxide
7075 aluminum · 5-day rapid prototype
POM-C · CNC turning · ±0.05 mm
PEEK · CNC milling · annealed for stability
Why Renjiu
Every order follows a documented process from material certification to final dimensional report — so what you approve is exactly what arrives.
Our workshop in Ningbo combines CNC machining centers, turning lathes and a dedicated inspection room equipped with CMM, 2D projectors, roughness and hardness testers. Engineers review every drawing before quoting, flag tolerance risks early, and keep you updated from first article to shipment.
Finishing
Parts leave our factory finished and ready to assemble. All finishing is handled by audited local partners under our quality control.
Machining Knowledge
Practical guides on materials, tolerances, finishes and design-for-machining, written by our engineers.
Get a detailed quotation within 24 hours · NDA available · No minimum order for prototypes
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