Ningbo Guanshuo Precision Hardware Co., Ltd. (established 2016) is a National High‑Tech Enterprise and ISO 9001 certified manufacturer of high‑end precision motor shafts. Our products are trusted by global brands including Goldsmiths, French Decathlon, Omron, and Yasi. With diameter tolerances reaching IT4--IT5 (±0.003--±0.008mm), coaxiality ≤0.005mm, surface roughness down to Ra0.025μm on bearing journals, and dynamic balance grade G1.0--G0.4, our motor shaft delivers exceptional performance for ultra‑precision transmission scenarios in medical equipment, aerospace, new energy vehicles, and industrial automation. We combine premium materials (20CrMnTi, 42CrMo, stainless steel) with carburizing, quenching and nitriding to achieve HRC58--62 surface hardness while retaining a tough core. Our 50+ employee facility operates 26 CNC grinders, 6 centerless grinders, and a full metrology lab, ensuring batch‑to‑batch consistency and 100% interchangeability.
Our motor shaft is engineered for high‑speed, heavy‑load, and ultra‑precision transmissions where tight tolerances directly impact system reliability.
● Diameter tolerance ±0.003--±0.008mm (IT4--IT5) ensures consistent fit under thermal and load variations.
● Coaxiality ≤0.005mm and radial runout ≤0.008mm minimise unbalanced forces and bearing wear.
● Surface roughness Ra0.025--0.1μm on bearing journals enables gapless assembly and superior lubrication retention.
These specifications make our precision motor shaft the preferred choice for medical CT rotors, aerospace actuators, high‑speed spindles, and EV drive motors.
| Parameter | Specification | Recommended Application |
|---|---|---|
| Outer Diameter Tolerance | h6 | Standard fit for general industrial motors |
| Surface Roughness (Standard) | Ra0.4 -- Ra0.8 | Industrial automation, general transmission |
| Surface Roughness (Ultra‑High Precision) | Ra0.025 -- 0.1μm | Medical servos, aerospace actuators, high‑speed spindles |
| Case Hardening Depth | 0.8 -- 2.0 mm | Heavy‑load, high‑frequency variable speed |
| Surface Hardness (after heat treatment) | HRC58--62 | Carburizing / quenching / nitriding processes |
| Dynamic Balance Grade | G1.0 -- G0.4 | High‑speed, low‑noise precision motors |
※ Ra0.025--0.1μm refers to bearing journal and shaft extension faces; standard outer surfaces follow Ra0.4--0.8.
We select 20CrMnTi, 42CrMo, and stainless steel based on service conditions, then apply carburizing, quenching and nitriding to achieve a hard wear‑resistant surface (HRC58--62) with a tough, shock‑absorbing core.
● 20CrMnTi offers excellent hardenability for gear shafts; 42CrMo provides higher strength for heavy loads; stainless steel grades ensure corrosion resistance for medical and food applications.
● The gradient hardness profile (surface HRC58--62, core 30--40 HRC) resists wear while absorbing impact loads.
● Nitriding further reduces friction and improves anti‑seizure properties, especially beneficial for high‑speed operation.
This material‑process combination has been field‑validated in EV drive motors and industrial robots, significantly extending overhaul intervals.
Our precision motor shaft achieves dynamic balance grade G1.0--G0.4, reducing vibration by 30%--40% compared to standard G2.5 shafts.
● Precision balancing on high‑sensitivity machines eliminates centrifugal unbalance, reducing bearing loads and grease degradation.
● Grade G0.4 meets the most stringent requirements for medical imaging and aerospace fuel pumps.
● Lower vibration directly translates to quieter operation -- a critical factor in CT scanners and high‑end spindles.
For applications where noise and vibration are mission‑critical, our motor shaft delivers measurable performance advantages.
Ningbo Guanshuo Precision Hardware Co., Ltd. (founded 2016) is a National High‑Tech Enterprise with 50+ employees, a complete closed‑loop production chain, and a reputation as a core supplier to new‑energy, automation, and appliance industries.
● Facility located in Ningbo, Zhejiang -- close to the Port of Ningbo for efficient export logistics.
● Team includes 3 engineering specialists and 6 full‑time QC engineers; we operate 26 CNC cylindrical grinders, 6 centerless grinders, 6 hobbing machines, 2 machining centers, 3 turn‑mill composites, and 60+ additional CNC units.
● Metrology lab equipped with hardness testers, 2D projectors, roughness testers, gear testing centers, and cylindricity gauges.
Our vertically integrated capabilities ensure full control over quality, cost, and delivery -- from raw material to finished precision motor shaft.
We hold ISO 9001:2015 certification and 11 utility patents covering innovative motor shaft designs, lubrication channels, sealing structures, and mounting bases.
● ISO 9001:2015 ensures consistent process control and continuous improvement across all production stages.
● Our 11 patents (including combined motor shaft, oil‑injection bearing shaft, sealed motor shaft, and stabilised fixing base) demonstrate strong R&D capability.
● National High‑Tech Enterprise status further validates our technological innovation and intellectual property portfolio.
These certifications and patents provide our customers with confidence in both quality and design differentiation.
Our motor shaft is deployed across new energy vehicles, industrial automation, medical equipment, aerospace, food/chemical machinery, and smart home appliances.
● EV & HEV: drive motor shafts and gearbox input shafts -- requiring high fatigue strength and thermal stability.
● Medical & Aerospace: CT rotors, surgical tools, and fuel‑pump shafts -- demanding ultra‑low vibration and corrosion resistance.
● Industrial & Home: servo and robot joints, high‑end vacuum motors -- balancing precision, noise, and cost.
We can provide application‑specific recommendations and case studies upon request.
We provide a 100% interchangeability guarantee -- if third‑party CMM inspection detects deviation from agreed tolerances, we cover replacement and expedited freight.
● Guarantee covers coaxiality, diameter, and all critical dimensions -- any non‑conformance triggers full replacement at our cost.
● SPC with CPK ≥ 1.33 ensures batch‑to‑batch consistency; each shaft carries a unique serial number for full traceability.
● All quality inquiries are acknowledged within 24 hours, with a preliminary action plan.
Our quality promise gives procurement teams peace of mind when sourcing this motor shaft.
Located near the Port of Ningbo, we offer fast, cost‑effective export logistics to Europe, North America, Southeast Asia, and Japan/Korea.
● Our factory is less than 20 km from the port, enabling rapid container loading and customs clearance.
● We partner with major freight forwarders for competitive rates and priority booking.
● Standard packaging includes anti‑rust treatment and reinforced cartons/crates; we can arrange door‑to‑door (DDP/DAP) delivery.
Our logistics infrastructure ensures your precision motor shaft arrives on time and in perfect condition.
Reach us directly -- we guarantee a response within 24 hours and can connect you with a senior engineer for technical discussions.
● Company: Ningbo Guanshuo Precision Hardware Co., Ltd.
● Address: No. 268‑1 Qingqing Road, Jiaochuan, Zhenhai, Ningbo, Zhejiang, China.
● For custom solutions or samples, we assign a dedicated project engineer from quotation to delivery.
We look forward to partnering with you on your next motor shaft project.
A: Standard parts MOQ is 500--1000pcs; custom shafts/gears 300pcs; 42CrMo alloy steel items 800pcs. Orders below MOQ are accepted with a 30%--50% small‑order surcharge (waived if order value ≥ USD 5,000). Mixed items can combine quantities to meet MOQ, and regular repeat clients may negotiate lower MOQ.
A: For bulk production, lead time is 15--25 working days, depending on quantity and complexity. Sample lead time: 1--3 working days for stock samples; 7--12 days for custom machined samples; 12--18 days for items with heat treatment or special surface finish. Expedited service is available upon request for urgent orders.
A: We perform a full DFM review, provide process capability studies, and submit first‑article inspection reports for your approval before mass production. SPC controls all critical dimensions.
A: Yes, our engineers are available for installation guidance, troubleshooting, and failure analysis. Replacement parts are covered under warranty.
A: Absolutely. Samples can be produced based on your drawing or our standard designs. Sample charges are waived for first‑time clients with potential mass orders; shipping costs are borne by the buyer (freight collect or client's forwarder pickup).
Address
Qingqing Road 268-1, Jiaochuan Sub-district, Zhenhai District, Ningbo City, Zhejiang Province, China
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