Dongfeng
SFU3205 Heavy-Duty Rolled Ball Screw for CNC Machining Centers
SFU3205 heavy-duty rolled ball screw with 32 mm shaft and 5 mm lead, delivering 22.5 kN dynamic load at C7 precision grade. The 32 mm diameter provides 2.5× the bending stiffness of SFU2510, making it ideal for VMC feed axes, CNC lathe Z-axis, and gantry mill applications where spindle head weight and cutting forces demand high rigidity.
Key Features
- 32 mm shaft provides 2.5× the bending stiffness of SFU2510, reducing deflection under heavy spindle head weight
- 22.5 kN dynamic load with 34.8 kN static — sufficient for 1-ton-class VMC feed axes with 2× safety margin
- 5 mm lead prioritizes positioning resolution: 0.01° motor step = 0.14 µm linear travel for fine VMC Z-axis depth control
- Standard lengths up to 4000 mm — covers full VMC X-axis travel and large gantry Y-axis without splice joints
- Complete assembly with end-machined shaft for BK32/BF32 blocks and pre-loaded single flange nut
- 250 kW induction hardening capability ensures HRC 58–62 with 2.0 mm case depth for sustained heavy-cycle duty
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 | 32 mm |
| Lead | 5 mm |
| Lead Accuracy | ±0.05 mm / 300 mm |
| Material | Chrome Steel (GCr15 / 52100) |
| Shaft Hardness | HRC 58–62 |
| Dynamic Load | 22.5 kN (single nut) |
| Static Load | 34.8 kN |
| Standard Lengths | 500 mm – 4000 mm |
| Support Block | BK32 / BF32 compatible |
Application fit notes
User Pain Point + Solution + Data
VMC (vertical machining center) feed axes carry spindle head weights of 80–150 kg plus cutting reaction forces, demanding ball screws that resist both static deflection and dynamic shock. The SFU3205 addresses this with a 32 mm shaft diameter that increases bending stiffness by 2.5× versus the SFU2510, and a 5 mm lead that prioritizes positioning resolution over feed speed. At C7 grade, lead accuracy is ±0.05 mm/300 mm — adequate for VMC X/Y/Z axes where the machine controller compensates for lead error via mapping. Dynamic load reaches 22.5 kN with the single flange nut, sufficient for 1-ton-class VMC feed axes.
Complete Specifications
| Parameter | Value |
|---|---|
| Precision Grade | C7 (ISO 3408) |
| Shaft Diameter | 32 mm |
| Lead | 5 mm |
| Lead Accuracy | ±0.05 mm / 300 mm |
| Material | GCr15 Chrome Steel (52100 equiv.) |
| Shaft Hardness | HRC 58–62 (induction hardened) |
| Dynamic Load Capacity | 22.5 kN (single nut) |
| Static Load Capacity | 34.8 kN |
| Standard Lengths | 500 mm – 4000 mm |
| Nut Type | Single flange nut, pre-loaded |
| Support Bearing Block | BK32 / BF32 compatible |
Product Advantages
32 mm Shaft for VMC Rigidity
The 32 mm shaft diameter increases the second moment of area by 2.5× versus 25 mm, directly reducing static deflection under heavy spindle head weight. This maintains positioning accuracy without intermediate support bearings on axes up to 2 m.
High Rigidity5 mm Lead for Resolution
5 mm lead prioritizes positioning resolution over feed speed: each 0.01° motor step equals 0.14 µm linear travel. Combined with the 32 mm shaft's rigidity, this makes the SFU3205 ideal for VMC Z-axis (spindle feed) where fine depth control matters.ers.
5 mm Lead4 m Standard Length
Standard lengths up to 4000 mm — covers full VMC X-axis travel (typically 800–1500 mm) and large gantry mill Y-axis (up to 3 m) in a single piece. No splice joint alignment issues on standard machine configurations.
4000 mm22.5 kN for 1-Ton-Class VMC
22.5 kN dynamic load with 34.8 kN static — sufficient for 1-ton-class VMC feed axes including the spindle head weight, workpiece, and cutting reaction forces with a 2× safety margin on dynamic loading.
22.5 kNEnterprise Strength
Xiamen Dongfeng Bearing Mechanical & Electrical Co., Ltd.Ltd. — established 2014, 10+ years in precision ball screw manufacturing. Our 5,000 m² Xiamen facility operates 12 production lines with 200+ employees, including a heavy-series ball screw cell equipped with 250 kW induction hardening capability for shaft diameters up to 63 mm. Monthly capacity for SFU32+ series: 8,000+ assemblies.
Certifications: ISO 9001:2015, CE conformity, SGS factory audit. Export markets: 50+ countries with strong CNC machine tool supply presence in Germany, Italy, Turkey, India, and South Korea. Partners: Supplying VMC manufacturers, CNC lathe OEMs, and gantry milling machine builders.
Pre-sales: Feed axis load calculation and shaft diameter selection. After-sales: 18-month warranty, lead error mapping data provided. Customer case: Supplied 4,500 SFU3205-1200 assemblies to a Turkish VMC manufacturer over 4 years — zero shaft failure, measured lead accuracy drift <0.01 mm after 5,000 hours of operation.on.
Manufacturing, Exhibition & Quality Controltrol
Production Process & Quality Assuranceance
Process: GCr15 raw bar → CNC turning (shaft, end journals for BK32/BF32) → 250 kW induction hardening (HRC 58–62, case depth 2.0 mm) → thread rolling → nut machining → ball circuit assembly with pre-load → end machining → laser interferometer lead measurement → anti-corrosion packaging.
Quality testing: Lead accuracy 100% measured by laser interferometer, shaft straightness ≤0.03 mm/m, nut running torque at 3 positions along full travel, dynamic load validated on hydraulic rig at 1.2× rated load. Exhibitions: Exhibited at CIMT (Beijing), EMO (Hannover), and JIMTOF (Tokyo) to engage CNC machine tool manufacturers directly.
FAQ
What is the MOQ for SFU3205 ball screw assemblies?
MOQ is 30 pieces per length configuration. Mixed lengths accepted with 30-piece minimum per SKU. For custom end machining per drawing, MOQ is 20 pieces. Sample assemblies available for qualified buyers — contact us.
What are the shipping options and lead time?
FOB Xiamen. Standard lengths (500–2000 mm): 15–20 business days. Longer lengths (2500–4000 mm): 20–30 business days. Custom end machining: 25–35 business days. Sea freight for bulk: 28–35 days to Europe, 20–28 days to USA. Shafts 2000+ mm ship in wooden crates.
How are 4-meter ball screws packaged?
Shafts 2000 mm and above are packed in custom wooden crates with steel-reinforced V-block supports to prevent bending. Each shaft is anti-corrosion oiled and wrapped in moisture-barrier film. Oversized cargo surcharge applies for 4000 mm shafts via sea freight.
What payment methods do you accept?
T/T (30% deposit, 70% before shipment). L/C at sight for orders above USD 20,000 — recommended for SFU32+ orders. Escrow service available for first-time buyers on request.
Can I get a sample assembly for testing?
Yes. A standard SFU3205-800 sample is available with buyer covering shipping and sample cost. For bulk orders of 50+ pieces, sample cost is fully credited. Provide your required length and end machining to arrange.
Do you provide lead error mapping data and OEM services?
Yes. Lead error measurement data (laser interferometer plot) is provided per shaft for 20+ piece orders. Custom OEM part marking on shaft end available for 100+ piece orders. Custom end machining per drawing for 20+ piece orders — share your BK/BF block model or 2D drawing.
Request a Quote for SFU3205 Assemblies
Send your required shaft length, end machining (BK32/BF32 or custom drawing), and quantity — we reply within one 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.
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