BKBF Ball Screw Support Units for Precision Motion Systems
High-rigidity bearing supports designed for precision, smooth motion, and long service life in ball screw assemblies.
Are You Facing These Ball Screw Support Challenges?
Common problems that reduce precision, increase downtime, and compromise system performance
Concentricity Error Causes Shaft Vibration
Poor alignment between support units leads to excessive vibration, reducing system accuracy and accelerating bearing wear in critical motion applications.
Weak Housing Structure Under Load
Thin-walled support housings deform under operational stress, causing misalignment and premature failure in high-load industrial environments.
Inconsistent Ball Screw Fit Tolerance
Incompatible bore sizes waste assembly time and create unsafe clearances that compromise precision in automated production systems.
Missing Standard Mounting Dimensions
Non-standardized mounting patterns force costly machine base modifications and delay project timelines during equipment upgrades.
No Clear Preload Adjustment Guide
Improper bearing preload results in backlash or excessive friction, directly impacting positioning accuracy and motor efficiency.
Unstable Market Supply Cycles
Unpredictable delivery times disrupt production schedules and force emergency sourcing at premium prices, increasing total ownership costs.
Eliminate these costly problems with professionally engineered BKBF support units
See Our SolutionsWhy Choose Our BKBF Support Units
Precision-engineered solutions that directly address your motion control challenges
CNC Precision Machining ±0.01mm
Multi-axis CNC machining ensures bore concentricity within 0.01mm tolerance, eliminating shaft runout and extending bearing life by up to 300% compared to standard units.
High-Strength Alloy Construction
Hardened carbon steel or aerospace-grade aluminum housings withstand axial loads up to 8kN without deformation, providing stable support in demanding applications.
Integrated High-Rigidity Design
One-piece body construction with reinforced mounting base delivers 40% greater stiffness than welded alternatives, maintaining alignment under dynamic loads.
Preloaded Bearing Configuration
Factory-adjusted angular contact bearings eliminate axial play while maintaining smooth rotation, achieving positioning repeatability under ±0.005mm in high-speed cycles.
Complete C5/C7/C10 Compatibility
Full model range matches all standard ball screw diameters from 8mm to 80mm with verified fit tolerances, ensuring drop-in installation without modification.
100% Tested + Fast Delivery
Every unit undergoes runout testing and load verification before shipment, with standard lead times of 5-7 days and expedited 48-hour options available.
Experience the difference precision engineering makes in your motion systems
Request Technical ConsultationBKBF Support Unit Product Range
Comprehensive selection of fixed-side (BK) and supported-side (BF) units for complete ball screw assemblies
BK10
Fixed-side support for Ø10mm ball screws. Ideal for compact CNC machines and 3D printers requiring precise axial constraint.
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BK12
Fixed-side support for Ø12mm ball screws. Perfect for light-duty automation platforms with moderate load requirements.
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BK15
Fixed-side support for Ø15mm ball screws. Heavy-duty construction for industrial lathes and milling centers demanding high rigidity.
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BF10
Floating-side support for Ø10mm ball screws. Allows thermal expansion while maintaining radial guidance in precision systems.
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BF12
Floating-side support for Ø12mm ball screws. Essential companion to BK12 for complete axis assembly in automation equipment.
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BF15
Floating-side support for Ø15mm ball screws. Robust design handles thermal growth in long-travel systems without binding.
View DetailsNeed custom sizes or specialized configurations? We offer complete engineering support.
Explore Full SeriesUnderstanding BKBF Support Units
Essential knowledge for selecting and implementing ball screw support systems
What Are BKBF Support Units?
BKBF support units are precision bearing blocks that secure and guide ball screw shafts in linear motion systems. The "BK" fixed-side unit constrains axial movement and absorbs thrust loads, while the "BF" floating-side unit provides radial support and accommodates thermal expansion, creating a complete support system essential for maintaining shaft alignment and prolonging bearing lifespan.
Core Functions in Motion Systems
These support units control both axial and radial loads acting on ball screw assemblies. The fixed end (BK) handles thrust forces generated during acceleration and deceleration, preventing shaft displacement that would compromise positioning accuracy. The floating end (BF) manages radial forces and thermal length changes without creating binding stress, ensuring smooth rotation across the full travel range in CNC machines, robotics, and industrial automation platforms.
Precision Bearing Integration
Each unit houses factory-matched angular contact bearings installed with controlled preload to eliminate internal clearance. This preloaded configuration provides zero-backlash operation critical for bidirectional positioning, while hardened bearing races withstand millions of rotation cycles. The sealed bearing arrangement with integrated grease channels extends maintenance intervals, reducing downtime in continuous-operation environments.
Industrial Applications
BKBF support units enable precision motion in diverse manufacturing equipment including CNC lathes, milling machines, plasma cutters, laser engravers, 3D printers, pick-and-place robots, and automated inspection systems. Their standardized mounting patterns simplify machine design, while the availability of multiple sizes supports shaft diameters from miniature medical devices to heavy industrial gantries, making them foundational components across virtually all modern motion control applications.
High Rigidity
Robust housing resists deflection under load, maintaining precise shaft alignment throughout operation cycles.
Precision Preload
Factory-set bearing preload eliminates axial play for repeatable positioning accuracy in bidirectional motion.
Durable Housing
Heat-treated alloy construction withstands years of continuous use in harsh industrial environments.
Accurate Alignment
CNC-machined bore concentricity keeps shaft runout within microns, preventing premature bearing wear.
Grease Port Design
Integrated lubrication channels enable re-greasing without disassembly, extending service intervals.
Universal Ball Screw Fit
Complete size range matches all standard C5, C7, and C10 grade ball screws for simplified sourcing.
Ready to optimize your ball screw assembly with professional-grade support units?
Learn More About BKBF Working Principle →Technical Specifications
Detailed dimensional and performance parameters for precise system integration
| Model | Shaft Dia. | Bearing Type | Housing Material | Axial Load (N) | Weight | Surface Finish |
|---|---|---|---|---|---|---|
| BK10 | Ø10mm | Angular Contact | Aluminum Alloy | 3500 | 0.35kg | Anodized |
| BK12 | Ø12mm | Angular Contact | Aluminum Alloy | 4500 | 0.40kg | Anodized |
| BK15 | Ø15mm | Angular Contact | Carbon Steel | 6500 | 0.45kg | Black Oxide |
| BF10 | Ø10mm | Deep Groove | Aluminum Alloy | 2500 | 0.30kg | Anodized |
| BF12 | Ø12mm | Deep Groove | Aluminum Alloy | 3200 | 0.35kg | Anodized |
| BF15 | Ø15mm | Deep Groove | Carbon Steel | 4800 | 0.40kg | Black Oxide |
Need complete dimensional drawings and load capacity charts?
Download Full Specification PDFCustomization & OEM Capability
Flexible manufacturing solutions tailored to your unique motion control requirements
Logo Engraving
Laser-etched branding on housing surface ensures permanent identification while maintaining surface integrity and corrosion resistance for professional OEM presentation.
Non-standard Bore Customization
Custom bore diameters and tolerance grades machined to match proprietary ball screw specifications, eliminating fit issues in specialized motion systems.
Coating & Surface Treatment
Choose from nickel plating, hard anodizing, zinc phosphate, or PTFE coating options to meet specific environmental resistance requirements in harsh operating conditions.
Material Option Selection
Select aluminum alloy for lightweight applications, hardened carbon steel for heavy loads, or stainless steel grade 304/316 for corrosive environments.
Precision Machining per Drawing
CNC manufacturing from customer-supplied CAD files with full GD&T interpretation, achieving complex geometries and tight tolerance stacks for exact-fit integration.
Custom Packaging
Branded boxes, foam inserts, protective caps, and serialized labeling available for retail-ready presentation or secure logistics in volume shipments.
Ready to discuss your custom support unit requirements?
Start Your OEM Project →Manufacturing Process
Six-stage precision production ensures consistent quality in every BKBF support unit
Raw Material Cutting
Aerospace-grade aluminum or hardened steel bar stock cut to precise blank dimensions using CNC sawing for minimal waste.
CNC Turning
Multi-axis lathe operations machine bearing bores, mounting holes, and external profiles to ±0.01mm tolerance.
Bearing Assembly
Angular contact bearings press-fitted into housing using temperature-controlled interference fit for optimal retention.
Preload Adjustment
Lock nuts torqued to calibrated specifications using digital wrench, verified by axial play gauge measurement.
Quality Inspection
Dial indicator runout testing, surface finish verification, and dimensional CMM scanning document full compliance.
Packaging & Delivery
Anti-rust oil coating, protective caps installed, then boxed with shock-absorbing foam for safe worldwide shipping.
All parts are 100% tested before shipment to ensure zero-defect delivery.
Want to see our manufacturing facility in action?
Schedule Factory TourInstallation Guide
Step-by-step instructions for proper BKBF support unit mounting and alignment
Mount BK Unit Firmly on Fixed End
Position the BK fixed-side support on a machined flat surface using precision alignment pins. Torque mounting bolts to 12-15 Nm in a cross-pattern sequence to prevent housing distortion. Verify base flatness within 0.02mm using feeler gauge before proceeding.
Insert Ball Screw Shaft and Secure Nut
Clean the ball screw shaft journal with lint-free cloth and isopropyl alcohol. Carefully slide the shaft through the BK bearing while supporting its weight to avoid loading the bearing radially. Thread and hand-tighten the lock nut against the inner bearing race.
Align BF Side Support
Position the BF floating-side unit so the ball screw shaft enters the bearing bore concentrically without forcing. Check alignment using a dial indicator on the shaft – reading should not exceed 0.01mm TIR. Adjust BF position laterally before tightening mounting bolts.
Adjust Preload and Tighten Bolts
Use a calibrated torque wrench to tighten the BK lock nut to 8-10 Nm while monitoring rotational torque with a fish scale attached to the shaft. Target preload: 0.5-1.0 Nm drag torque. Secure BF mounting bolts to 12-15 Nm after confirming smooth rotation.
Check Axial Runout
Mount a magnetic-base dial indicator perpendicular to the shaft 50mm from the BK unit. Rotate the shaft one full revolution while observing indicator reading. Acceptable runout: under 0.015mm. If exceeded, loosen BK bolts, realign, and re-torque incrementally.
Lubricate and Test Rotation
Inject lithium-based NLGI Grade 2 grease through the lubrication port until slight purge appears at the seal. Manually rotate the ball screw 10 complete cycles to distribute lubricant. Final check: shaft should spin freely without binding or excessive resistance through full travel range.
Critical Warning: Incorrect installation may cause vibration, premature bearing failure, and loss of positioning accuracy. Always follow torque specifications and use calibrated tools.
Need installation support or technical assistance?
Contact Our EngineersApplication Scenarios
Proven performance across diverse industrial environments and precision motion requirements
CNC Machining Centers
Critical axis positioning for 3-5 axis milling systems requiring ±0.005mm repeatability under continuous cutting loads. BKBF supports maintain alignment accuracy over millions of cycles in high-speed machining operations.
Industrial Automation Systems
Pick-and-place robots, assembly line actuators, and material handling equipment operating 24/7. Our supports withstand shock loads and maintain precision in high-cycle manufacturing environments.
Medical Device Manufacturing
Ultra-precision motion control for surgical instrument production and diagnostic equipment assembly. Clean-room compatible design ensures contamination-free operation in sterile manufacturing zones.
Semiconductor Equipment
Wafer handling stages and photolithography systems requiring sub-micron positioning stability. BKBF units deliver thermal stability and vibration isolation critical for semiconductor fabrication processes.
3D Printing Systems
Z-axis control in industrial SLA/SLS printers and metal additive manufacturing platforms. Precision supports enable layer-by-layer accuracy while maintaining vertical alignment throughout extended print cycles.
Testing & Measurement Equipment
Coordinate measuring machines (CMM), material testing rigs, and optical inspection systems. Our supports provide the mechanical stability required for repeatable measurement results and calibration integrity.
Find the perfect BKBF solution for your specific application requirements
Discuss Your ProjectQuality Control & Inspection System
Rigorous multi-stage testing ensures every BKBF unit meets industrial precision standards
Material Hardness Test
Rockwell hardness testing verifies heat treatment effectiveness, ensuring housing strength meets HRC 45-50 specification for load-bearing capacity and wear resistance.
Dimensional Accuracy Check
CMM coordinate measuring machine validates all critical dimensions to ±0.005mm tolerance, guaranteeing precise mounting hole spacing and bore concentricity.
Bearing Runout Inspection
Dial indicator measurement tests shaft concentricity and axial/radial runout under 0.01mm TIR, confirming bearing installation quality and alignment precision.
Surface Finish Inspection
Profilometer scanning checks surface roughness Ra 0.8-1.6μm and coating uniformity, preventing premature corrosion and ensuring smooth bearing interface.
Preload Torque Measurement
Digital torque wrench verification confirms lock nut tightening to 8-10 Nm specification, while drag torque testing validates 0.5-1.0 Nm preload stability.
Final Assembly Audit
100% functional testing includes rotation smoothness check, load capacity verification, and visual inspection, ensuring zero-defect delivery and performance consistency.
Want to review our complete quality control documentation?
View QC Process →Bearing Type Comparison
Understanding bearing selection impacts support unit performance, load capacity, and service life
BKBF support units utilize different bearing configurations optimized for specific loading conditions. Fixed-side (BK) units typically employ angular contact bearings for thrust load handling, while floating-side (BF) units use deep groove ball bearings for radial support with axial freedom. Selection of bearing type directly determines positioning accuracy, vibration resistance, and maximum operational speed.
| Bearing Type | Precision | Load Capacity | Vibration Resistance | Cost | Use Case |
|---|---|---|---|---|---|
| Angular Contact (BKBF Standard) |
Medium | CNC / Automation | |||
| Deep Groove Ball | Low | Low-load devices | |||
| Tapered Roller | High | Heavy-duty systems |
Engineering Insight: Choosing the right bearing type determines performance stability. Angular contact bearings provide optimal balance of precision and load capacity for most motion control applications, while deep groove bearings suit cost-sensitive projects with lighter loads. Tapered roller bearings excel in heavy industrial environments where maximum thrust capacity outweighs speed limitations.
Unsure which bearing configuration suits your application?
Get Engineering ConsultationCustomer Testimonials
Global manufacturers trust our BKBF support units for critical motion control applications
Klaus M.
Precision Machinery GmbH
"Excellent preload control and zero vibration. We replaced competitor units in our CNC mill and immediately saw improvement in surface finish quality. The bearing concentricity is outstanding – measured 0.008mm runout, well within our 0.01mm requirement. After 6 months of continuous operation, no degradation in performance."
Mike R.
Automated Systems Inc.
"Custom version matched perfectly with our C5 grade ball screws. The engineering team provided detailed drawings within 24 hours and delivered custom bore size in 10 days. Installation was straightforward with clear documentation. Load capacity exceeds specification – we're running 30% higher thrust than rated with no issues."
Tuan N.
Industrial Automation Co.
"Durable coating, no rust after one year in humid tropical conditions. Our previous supplier's units corroded within 3 months, but these anodized aluminum housings still look new. The price was competitive and delivery was faster than expected. We've now standardized on this brand for all our automation projects."
Join hundreds of satisfied manufacturers worldwide
Read More Feedback →Global Projects & Export Experience
Trusted by manufacturers across six continents for precision motion control solutions
10+
Years of Mechanical
Transmission Experience
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Countries
Served
100+
Automation Projects
Supplied
ISO 9001 certified manufacturing ensures consistent quality across international orders
Expert logistics network delivers to remote locations with full customs documentation
Multilingual technical support available in English, German, Spanish, and Mandarin
Discover why global manufacturers choose our motion control solutions
Explore Our Global NetworkRequest a Quote
Get expert engineering support and competitive pricing for your precision motion project
Need BKBF supports for your precision motion project?
Our engineers are ready to help you select the optimal support configuration, provide load calculations, and deliver custom solutions tailored to your exact requirements.
24-Hour Response: Technical quotes delivered within one business day
Engineering Support: Free load analysis and compatibility verification
Custom Solutions: Non-standard dimensions available with 10-day lead time
Volume Discounts: Competitive pricing for OEM and bulk orders
✓ Secure inquiry processing with confidentiality protection
✓ No obligation quotation with detailed technical specifications
✓ Direct factory pricing eliminates distributor markup