Dongfeng
SFU Series Rolled Ball Screw Assembly
SFU1605 rolled ball screw assembly with C7 precision grade, 5 mm lead, and pre-loaded single nut — suited for 3D printers, laser engravers, and light CNC gantry axes where cost-efficient linear motion at ±0.05 mm/300 mm positioning tolerance is sufficient.
Key Features
- C7 precision grade with lead accuracy ±0.05 mm/300 mm — meets most desktop CNC, engraver and 3D printer axis specs
- 16 mm shaft diameter, 5 mm lead (1605 designation) — compact form factor fits standard 6204 support bearings without modification
- Chrome steel screw and nut body, induction-hardened ball track — shaft hardness HRC 58-62 for extended wear life under cyclic loads
- Single pre-loaded ball nut supplied as complete assembly with end-machined shaft, ready to install with BK/BF fixed bearing blocks
- Low-noise recirculating ball circuit — measured running noise typically under 55 dB in bench tests at 600 RPM
- Available in standard lengths 300 mm to 1500 mm; custom cut-to-length with end machining available upon request
- Metric thread flange nut with four M4 mounting holes, compatible with standard SFU1605 nut housings across the market
- Suitable for horizontal and vertical axis use; lubrication port on nut body for grease or oil maintenance
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 | C7 (ISO 3408) |
|---|---|
| Shaft Diameter | 16 mm |
| Lead | 5 mm |
| Lead Accuracy | ±0.05 mm / 300 mm |
| Material | Chrome Steel (GCr15 / 52100) |
| Shaft Hardness | HRC 58-62 |
| Dynamic Load Capacity | 6.8 kN (single nut) |
| Standard Lengths | 300 mm – 1500 mm |
| Lubrication | Grease or oil via nut port |
| Reference SKU | SFU-1605-500 |
Application fit notes
SFU Series — Rolled Ball Screw
The SFU1605 is a 16 mm diameter, 5 mm lead rolled ball screw assembly built from GCr15 chrome steel with an induction-hardened ball track (HRC 58-62). At C7 precision grade per ISO 3408, lead accuracy is ±0.05 mm per 300 mm — within tolerance for desktop CNC routers, diode laser engravers, and FDM 3D printer Z/X axes where sub-0.1 mm repeatability is the practical requirement. The assembly ships complete: end-machined shaft plus a single pre-loaded flange nut, ready to mount with standard BK12/BF12 bearing blocks and SFU1605 nut housings.
Specifications
| Parameter | Value |
|---|---|
| Precision Grade | C7 (ISO 3408) |
| Shaft Diameter | 16 mm |
| Lead | 5 mm |
| Lead Accuracy | ±0.05 mm / 300 mm |
| Material | GCr15 Chrome Steel (equiv. 52100) |
| Shaft Hardness | HRC 58-62 (induction hardened) |
| Dynamic Load Capacity | 6.8 kN (single nut) |
| Standard Lengths | 300 mm – 1500 mm |
Key Features
Complete Assembly
Shaft arrives with both ends machined and a pre-loaded flange nut fitted. No secondary turning needed for standard BK/BF block configurations.
Ready to InstallLow Running Noise
Recirculating ball circuit geometry keeps bench-measured noise typically below 55 dB at 600 RPM — relevant for open-frame engravers and lab equipment.
Low NoiseMarket-Compatible Nut
Four-hole M4 flange pattern matches SFU1605 nut housings from most linear motion suppliers, so it drops into existing machine designs without redesign.
Metric SeriesTypical Applications
Desktop CNC routers (X/Y axis, up to ~5 kg carriage), CO2 and diode laser engravers, FDM and resin 3D printer Z-axis, light pick-and-place gantries, and DIY automation fixtures. For axes requiring positioning under ±0.01 mm or sustained loads above 15 kN, the SFE Series ground variant is a better fit.
FAQ
What is the MOQ and what lead time should I expect?
MOQ is 50 pieces per SKU (length + diameter combination). Standard lengths 300–1000 mm typically ship within 7-15 business days. Custom lengths with special end machining: 15-25 business days. Exact lead times confirmed at order.
Can I order custom lengths or non-standard end machining?
Yes. Shaft length up to 1500 mm (longer on request), and end machining can be adjusted to customer drawing — journal diameter, keyway, thread. Please share your 2D drawing or DXF when inquiring.
How does the C7 rolled screw differ from the C5 ground version?
Rolling forms the ball track without material removal, giving ±0.05 mm/300 mm accuracy. C5 grinding removes material to achieve ±0.008 mm/300 mm — roughly 6× tighter. For 3D printers and engravers C7 is cost-efficient; for semiconductor or medical motion stages the SFE ground series is the right choice.
Get Pricing & Lead TimeTime
Send shaft length, quantity, and end machining requirements. We confirm availability and price within 1 business day.
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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