Description

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Standardized precision ball screw support units for axial load transmission in CNC axes and linear actuators. Engineered for high axial rigidity and low rotational runout under bidirectional dynamic loading.

Available Configurations: Fixed-side (BK/EK/FK) with matched angular contact bearings; supported-side (BF/EF/FF) with deep groove ball bearings.

Compatibility: Direct dimensional drop-in replacement for THK, Misumi, and NSK standard series.

Quick Reference Matrix:

Series	Type	Bore Range (d)	Matching Screw Dia.	Primary Application
BK/BF	Square Fixed / Supported	10 - 40 mm	dia. 14 - dia. 40 mm	Standard CNC mill, general automation
EK/EF	Compact Square	8 - 20 mm	dia. 10 - dia. 20 mm	Light gantry, XY positioning stage
FK/FF	Round Fixed / Supported	6 - 30 mm	dia. 8 - dia. 30 mm	High-speed compact actuator, laser head

Technical Specifications

Parameter	Specification / Standard	Tolerance / Grade
Housing Material	C45 Carbon Steel / SCM440 Alloy Steel	Black oxide surface treatment (12 to 18 um)
Fixed-Side Bearing Type	60 deg contact angle, preloaded matched pair	P5 / P4 (JIS B 1521)
Supported-Side Bearing	Sealed Deep Groove Ball Bearing (ZZ/2RS)	P5 (JIS)
Center Height Tolerance (+/- H)	+/- 0.015 mm (measured from base to shaft center)	ISO 286-2 class h6 equivalent reference
Axial Runout (Fixed Side)	<= 0.008 mm	Measured at bearing shoulder face
Operating Temperature	-20 deg C to +80 deg C	Standard lithium grease (Alvania EP2 / equivalent)

Key Features

Rigid Preload Structure: Matched-pair angular contact thrust bearings eliminate axial play (0.00 mm backlash contribution from support unit).

Integral Oil Seal Design: Low-friction synthetic rubber lip seals on fixed-side housings prevent coolant and metal-chip ingress.

Controlled Base-to-Bore Parallelism: Precision-ground mounting base and center bore reference planes ensure zero angular misalignment during bolt-down.

Heat-Treated SCM440 Options: High-load variants feature induction-hardened critical shoulders to resist micro-fretting under heavy reverse thrust.

Applications

CNC Machining Centers: X/Y/Z ball screw anchoring.

Laser Cutting & Plasma Gantries: High-acceleration gantry crossbeams.

Precision Press/Riveting Units: High axial reaction force dampening.

Multi-Axis Industrial Robots: Vertical stroke weight compensation support.

Customization

Non-Standard Dimensions: Modified mounting hole PCD, extended housing length, or custom pilot diameters for OEM frame integrations.

Material & Coating: Stainless steel (SUS304/SUS440C) for food/medical cleanrooms; electroless nickel plating (ENP, 25 to 30 um) for high-humidity/coolant-heavy environments.

Special Grease Pre-fill: Cleanroom vacuum-compatible grease (e.g., Krytox/Yubase equivalents) or high-temp synthetic fill.

Quality Control & Traceability

Dimensional Audit: CMM (Zeiss DuraMax) sampling rate 5% per lot on H, d, and bolt-hole pitch.

Runout & Preload Verification: Pneumatic/dial-gauge fixture check on 100% of P4-grade fixed blocks.

Hardness Testing: Rockwell hardness (HRC 58-62 on bearing raceways, HRC 22-28 on C45 housing body) via Wilson hardness tester.

Documentation & Traceability: Laser-engraved heat-lot code on housing flank. EN 10204 3.1 Material Test Report (MTR) provided per heat lot at no extra charge upon specification.

Manufacturing & Certifications

Machining Footprint: 18 CNC turning centers (Mazak/Doosan), 6 vertical machining centers, internal cylindrical/surface grinding lines.

Process Control: Statistical Process Control (SPC) applied to critical center-height dimensions (Cpk > 1.33).

System Compliance: ISO 9001:2015 certified quality management system (TUV Rheinland audit file #QMS-2024-8821; remote live video audit channel active with 3 working days' notice).

Packaging & Delivery

Individual Protection: Anti-rust VCI film wrap -> rigid individual folding box with foam insert.

Bulk Master Carton: Heavy-duty 5-layer corrugated carton with palletized wooden/plastic fumigation-free base for air/sea export.

Evaluation Sample Policy: 1-set engineering pilot validation sample available (dispatched within 5 working days).

Lead Time:
Standard catalog items (d <= 25 mm, qty < 500): 7-10 working days ex-works.
Stock buffer program available for recurring OEM forecast schedules.

FAQ

Q: Can your BK20 be interchanged directly with THK BK20?

A: Yes. Bolt hole spacing, center height (H = 34 mm), and thread pitch match THK drawing spec.

Q: Do you supply locknuts (RN series) and lockwashers together?

A: Not included by default. Specify "with locknut/washer kit" in RFQ if required.

Q: What is the recommended tightening torque for the mounting bolts?

A: M6 bolts: 14 Nm (Class 10.9); M8 bolts: 34 Nm (Class 10.9) onto ground steel frame.

Q: Are EN 10204 3.1 MTRs standard or extra charge?

A: Included at no extra charge per heat lot upon prior RFQ specification.

Q: Can we audit your grinding/assembly workshop via video call?

A: Yes, remote live video inspection of QC and grinding lines can be scheduled with 3 working days' notice.

Request a Quote (RFQ)

To receive a commercial & technical proposal within 24 hours, provide:
Series & Bore Size: (E.g., BK15 + BF15)
Grade/Accuracy: P5 or P4
Quantity / Sample Status: ___ Pcs (or 1-set pilot sample)
Target Port / Destination: (City / Country for DDP/FOB calc)
Special Requirements: (EN 10204 3.1 MTR required: Yes/No, ENP plating / stainless / custom drawing attached: Yes/No)

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