Dongfeng
SFE Series Ground Ball Screw Assembly
SFE2005 ground ball screw assembly at C5 precision grade, delivering ±0.008 mm/300 mm lead accuracy with a 20 mm shaft and 5 mm lead — designed for semiconductor wafer handling, medical imaging stages, and precision CNC applications where positional repeatability under 0.01 mm is a hard requirement.
Key Features
- C5 precision grade per ISO 3408 — lead accuracy ±0.008 mm/300 mm, axial play below 0.005 mm with pre-loaded double nut
- 20 mm shaft diameter, 5 mm lead — ball track ground after heat treatment for consistent geometry along full travel length
- GCr15 chrome steel shaft, through-hardened and precision ground; nut body alloy steel with surface treatment for corrosion resistance
- Pre-loaded double-nut assembly supplied; pre-load class available upon request (light/medium) to match stiffness and drag torque requirements
- Suitable for vertical axis and high-duty-cycle applications — axial rigidity up to 280 N/µm under rated pre-load conditions
- Standard lengths 200 mm to 1200 mm; longer shafts and custom end machining per customer drawing available upon request
- Low thermal growth design: ground thread geometry minimizes friction heat at high feed rates, relevant for semiconductor and optical alignment stages
- Compatible with standard BK/BF 20 fixed bearing blocks and SFE2005 nut housings; metric flange pattern
Common Sourcing Problems & How We Solve Them
Buyer Pain Points
- Inconsistent dimensional tolerances across batches cause machine downtime and re-work costs
- Suppliers unable to provide material certs, inspection reports or CE documentation for customs clearance
- Long lead times and high MOQ requirements make sample evaluation and first orders difficult
Dongfeng Solution
- ISO 9001:2015 process controls with CMM dimensional inspection on every production batch
- Full documentation package: material cert, SGS test report, CE declaration, packing list on request
- Flexible MOQ from 1 piece for samples; bulk order lead time 15–20 working days
Performance Data
- 10+ years of linear motion component manufacturing — 50+ export markets served
- Hardness tested to HRC 58–62; dimensional tolerance held to JIS / ISO / DIN standard grade
- CE & SGS certified; ISO 9001:2015 quality management system in production
Utility record
| Precision Grade | C5 (ISO 3408) |
|---|---|
| Shaft Diameter | 20 mm |
| Lead | 5 mm |
| Lead Accuracy | ±0.008 mm / 300 mm |
| Axial Play | < 0.005 mm (pre-loaded double nut) |
| Material | Chrome Steel (GCr15 / 52100), ground |
| Dynamic Load Capacity | 12.7 kN (double nut) |
| Axial Rigidity | Up to 280 N/µm |
| Standard Lengths | 200 mm – 1200 mm |
| Reference SKU | SFE-2005-600 |
Application fit notes
SFE Series — Ground Ball Screw
Where rolled screws reach their limit, the SFE2005 starts. The 20 mm shaft is ground after through-hardening — not before — so the ball track geometry reflects the final metallurgical state of the material. Result: C5 grade per ISO 3408, lead accuracy ±0.008 mm per 300 mm, axial play held below 0.005 mm with the pre-loaded double-nut assembly. These numbers matter on semiconductor wafer transfer stages, ophthalmology scanner axes, or any motion platform where a 0.01 mm drift shows up in product yield.
Specifications
| Parameter | Value |
|---|---|
| Precision Grade | C5 (ISO 3408) |
| Shaft Diameter | 20 mm |
| Lead | 5 mm |
| Lead Accuracy | ±0.008 mm / 300 mm |
| Axial Play | < 0.005 mm (pre-loaded double nut)ut) |
| Material | GCr15 Chrome Steel, precision ground |
| Dynamic Load Capacity | 12.7 kN (double nut assembly) |
| Axial Rigidity | Up to 280 N/µm under rated pre-load |
| Standard Lengths | 200 mm – 1200 mm |
Key Features
Post-Hardening Grind
Ball track is ground after heat treatment, removing distortion introduced during hardening. This is what separates C5 ground from C7 rolled in sustained high-cycle duty.
Ground PrecisionPre-loaded Double Nut
Factory-set pre-load eliminates backlash for bidirectional positioning. Pre-load class (light or medium) can be specified at order to balance rigidity against drag torque for the application.
Zero BacklashLow Thermal Growth
Ground thread geometry produces lower friction heat at high feed rates versus rolled — relevant when thermal expansion of the screw shaft would otherwise accumulate as positioning error over long duty cycles.
High RigidityTarget Applications
Semiconductor wafer handling and inspection stages, medical imaging linear axes (CT, ophthalmology), precision machining centers (VMC/HMC feed axes), optical alignment platforms, and measurement equipment. For lighter-duty desktop CNC and engravers where C7 tolerance is acceptable, the SFU rolled series offers a more cost-efficient alternative.
FAQ
What MOQ applies to the SFE ground series?
MOQ is 10 pieces per configuration (diameter + lead + length combination). For mixed lengths or custom end machining, minimum order quantity and lead time are confirmed per inquiry — typically 20-35 business days for ground series versus 7-15 for standard rolled.
Is the pre-load class fixed, or can it be customized?
Pre-load class can be specified as light or medium at order. Light pre-load suits high-speed axes where drag torque must stay low; medium suits applications needing higher axial stiffness. Exact pre-load force values and corresponding drag torque data are available upon request.
Do you provide material certificates or inspection reports?
Material certificates (GCr15 heat number traceability) and dimensional inspection reports are available upon request for orders requiring documentation. Please specify at inquiry stage so we can factor inspection time into the lead time.
Request Specifications & Pricingcing
Provide shaft length, pre-load class, end machining requirements, and order quantity. We respond within 1 business day with pricing and lead time confirmation.
Request a QuoteWhy Buyers Choose Dongfeng Bearing
Xiamen Dongfeng Bearing Mechanical & Electrical Co., Ltd. — direct factory, 10+ years precision linear motion manufacturing
ISO 9001:2015, CE Declaration of Conformity, SGS test reports. Documentation available for EU and North American import requirements.
12 precision grinding and CNC machining lines; monthly output 500,000+ pieces across linear bearing and guideway series.
Germany, USA, Japan, South Korea, India, Southeast Asia and 40+ other countries. FOB Xiamen with DHL / FedEx / sea freight options.
Technical selection support before order. Dimensional drawing, material cert and inspection report with shipment. 12-month warranty on manufacturing defects.
Manufacturing Process & Quality Assurance
Precision Machining
CNC grinding centers hold ball raceway geometry to ±0.003 mm. Induction hardening targets contact zones to HRC 58–62 without embrittling the full body.
CMM Dimensional Inspection
Every batch passes coordinate measuring machine (CMM) verification. Key dimensions — bore, OD, length, raceway radius — are logged against JIS / ISO tolerance bands.
Certification & QC
ISO 9001:2015 controls govern raw material intake, in-process check, and final inspection. SGS and CE documentation issued on request for each shipment.
Trade Shows & Partnerships
Regular exhibitor at Canton Fair and Hannover Messe. Established supply partnerships with automation integrators and machine tool OEMs across Europe and Asia.
Customer Application Cases
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