Miniature Preloaded Ball Screws with shaft diameters from 3 mm to 12 mm deliver zero-backlash motion control, axial rigidity, and precise positioning within compact machine envelopes. Ground Gothic arch raceways paired with micro-calibrated ball selection maintain low drag torque variation throughout the entire travel stroke.
Key Features
Zero Axial Clearance: Preloaded ball assembly eliminates internal backlash under bidirectional axial loads.
Precision Lead Accuracy: Available in JIS C3, C5, and C7 accuracy grades.
Uniform Operating Torque: Controlled raceway finishing limits drag torque fluctuation across the full stroke.
Compact Nut Profiles: Flanged and cylindrical nut options fit constrained installation spaces.
Corrosion-Resistant Options: Stainless steel variants and surface plating handle demanding operational environments.
Technical Specifications
|
Parameter |
Value Range |
Standard / Unit |
|
Shaft Diameter |
3.0, 4.0, 6.0, 8.0, 10.0, 12.0 |
mm |
|
Lead Range |
0.5, 1.0, 1.5, 2.0, 4.0, 5.0, 10.0 |
mm |
|
Accuracy Grade |
C3, C5, C7 |
JIS B 1192 |
|
Axial Play |
0 (Preloaded) |
mm |
|
Preload Type |
Oversized Ball / Double Nut |
Internal Standard |
|
Screw / Nut Material |
SCM415H / SUS440C Stainless Steel |
JIS Standard |
|
Ball Material |
SUJ2 Bearing Steel / Silicon Nitride Ceramic |
ISO 3290 |
|
Surface Hardness |
58 – 62 |
HRC |
|
Max Stroke Length |
600 |
mm |
Product Configuration
Thread Profile: Gothic arch groove design optimizing contact angle and structural rigidity.
Circulation System: Internal deflector or end-cap circulation for smooth ball recirculation.
Nut Variants: Flange type and Cylindrical type configurations.
Sealing: Integrated end seals and labyrinth wipers prevent particulate contamination.
Accuracy & Lead Deviation
|
Accuracy Grade |
Travel Deviation (ep) |
Variation (v300) |
Recommended Application |
|
C3 |
± 0.008 mm |
0.006 mm |
Semiconductor Inspection, Optical Positioning |
|
C5 |
± 0.018 mm |
0.010 mm |
Medical Pumps, Precision Automation |
|
C7 |
± 0.050 mm |
0.050 mm |
General Linear Actuators |
Preload Control
Preload Mechanism: Micro-sorted bearing balls in 0.5 μm diameter increments establish balanced internal contact forces.
Preload Ratio: Standard preload force is calibrated to 1% – 3% of dynamic dynamic load rating.
Torque Stability: Drag torque fluctuation remains within ± 15% along the threaded shaft.
Dimensions & Model Selection
|
Model Code |
Shaft Dia (mm) |
Lead (mm) |
Nut OD (mm) |
Flange Dia (mm) |
Nut Length (mm) |
Dynamic Load Ca (N) |
Static Load C0a (N) |
|
MFP-0401 |
4 |
1.0 |
10 |
22 |
15 |
450 |
720 |
|
MFP-0601 |
6 |
1.0 |
12 |
24 |
18 |
820 |
1,450 |
|
MFP-0802 |
8 |
2.0 |
15 |
29 |
23 |
1,650 |
2,900 |
|
MFP-1002 |
10 |
2.0 |
18 |
34 |
26 |
2,400 |
4,800 |
|
MFP-1205 |
12 |
5.0 |
24 |
42 |
34 |
3,900 |
7,200 |
Manufacturing Process
Material Verification:
Spectrographic steel composition verification and ultrasonic internal flaw checks.
Rough Machining:
Precision CNC thread turning and shaft pre-grinding.
Heat Treatment:
Computer-controlled case hardening producing a 58–62 HRC wear-resistant layer.
Thread Grinding:
Multi-axis CNC thread grinding performed in climate-controlled cleanroom conditions (± 0.5°C).
Precision Sorting:
Automated optical measurement sorting steel balls into micro-graded batches.
Final Inspection:
Laser interferometer measurement for lead accuracy, runout, and preloaded running torque.
Applications of Miniature Preloaded Ball Screws
Semiconductor Handling: Wafer positioning stages and precision micro-pick-and-place units.
Medical Devices: Automated syringe pumps, analytical instruments, and surgical manipulators.
Optical Equipment: Motorized focus mechanisms, zoom drives, and laser positioning modules.
Precision Machining: Micro-drilling heads and EDM electrode drive units.
Supply Capabilities
Production facilities dedicated to micro-pitch screw grinding.
100% laser interferometer calibration and dynamic torque testing for shipped assemblies.
Material mill certificates, heat treatment reports, and accuracy chart logs retained per order batch.
Support for high-volume standard supply as well as short-run prototype development.
Customization & Modifications
Journal Machining: Customized end journal turning, keyways, retaining ring grooves, and metric threads based on customer technical drawings.
Corrosion Resistance: SUS440C stainless steel construction for cleanroom or high-humidity environments.
Lubrication Options: Cleanroom-compatible grease, vacuum-rated lubricants, or solid dry-film coatings.
Nut Modifications: Custom mounting flange shapes, flat reference surfaces, and altered hole patterns.
Technical Drawings & Data Downloads
Engineers and machine designers can access exact technical files:
2D Technical Drawings: PDF and DWG formats complete with shaft journal tolerance standards.
3D CAD Models: STEP and IGES formats ready for direct CAD assembly integration.
Data Sheets: PDF specifications detailing load limits, critical speed calculations, and fatigue life formulas.
FAQ
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