Description

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Preloaded Ball Screws eliminate axial play by applying a precise internal force between steel balls and raceways. This construction ensures zero-backlash motion and maximum axial rigidity in demanding precision positioning systems.

Key Features

01/

Zero Backlash: Internal ball loading removes axial play to ensure exact bidirectional positioning.

02/

High Rigidity: Rigid structure prevents elastic deformation under sudden directional changes.

03/

Ground Raceways: Optimized ball track profiles deliver uniform torque and smooth rolling motion.

04/

Machined Shaft Ends: Shaft ends are turned and ground precisely according to custom technical drawings.

05/

Dual Dust Seals: Integrated wipers at both nut ends protect internal tracks from solid contaminants.

Technical Specifications

Parameter	Value / Material
Screw Diameter	12 mm – 80 mm
Standard Lead	4 mm, 5 mm, 10 mm, 20 mm
Accuracy Class	C3, C5, C7
Shaft Material	Induction-hardened S55C steel
Nut Material	Case-hardened 20CrMnTi alloy steel
Surface Hardness	HRC 58 – 62
Straightness	0.02 mm / m

Product Configuration

Screw Shaft: Induction-hardened steel shaft featuring precision-ground helical grooves.

Ball Nut: Single flanged housing built with internal circulation channels.

Bearing Balls: Grade 10 steel balls sorted by micro-diameter tolerances.

Circulation Units: Stainless steel return inserts facilitating continuous ball flow.

Wiper Seals: Synthetic seals fitted at both ends to retain grease and block debris.

Accuracy & Lead Tolerance

Accuracy Grade	Cumulative Lead Error	Flange Radial Runout
C3	≤ 0.008 mm / 300 mm	≤ 0.006 mm
C5	≤ 0.018 mm / 300 mm	≤ 0.010 mm
C7	≤ 0.050 mm / 300 mm	≤ 0.020 mm

Preload Classes

Class	Preload Force Ratio	System Characteristic
P0 (Light)	1% – 3% Dynamic Load	Low running torque, minimal heat rise
P1 (Medium)	4% – 7% Dynamic Load	Balanced rigidity and positioning stability
P2 (Heavy)	8% – 10% Dynamic Load	Maximum axial stiffness under heavy loads

Dimensions & Model Selection

Model	Diameter	Lead	Dynamic Load (kN)	Static Load (kN)	Nut Flange Dia	Nut Length
SFU1204	12 mm	4 mm	6.2	12.8	40 mm	42 mm
SFU1605	16 mm	5 mm	13.8	30.5	48 mm	42 mm
SFU2005	20 mm	5 mm	15.5	38.8	58 mm	42 mm
SFU2510	25 mm	10 mm	27.2	64.1	62 mm	60 mm
SFU3205	32 mm	5 mm	21.1	67.5	80 mm	42 mm
SFU4010	40 mm	10 mm	66.3	162.0	93 mm	93 mm

Manufacturing Process

Material Inspection: Ultrasonic testing verifies internal density of incoming raw steel.

Induction Hardening: Deep heat treatment creates a durable outer wear layer.

Thread Grinding: Precision grinding machines finish raceways to strict profile limits.

Ball Matching: Steel balls are measured in micro-step increments to set correct tension.

Runout Inspection: Laser equipment checks shaft straightness and end-journal alignment.

Applications of Preloaded Ball Screws

Machine Tools:

Delivers steady drive force for main linear motion axes.

Laser Cutters:

Supports quick acceleration along complex cutting paths.

Medical Equipment:

Enables accurate, smooth movements in diagnostic positioning systems.

Automation Systems:

Maintains continuous accuracy across high-speed pick-and-place lines.

Why Choose Our Ball Screws

Verified Tolerances: Every unit undergoes laser measurement to verify lead accuracy.

Stable Drag Torque: Micro-sorted ball selection keeps turning resistance within fixed bounds.

Consistent Case Depth: Controlled induction hardening prevents premature surface flaking.

Direct Shaft Machining: CNC turning processes end journals matching technical prints.

Customization Options

End Machining:

Specialized threading, keyways, snap ring grooves, and steps.

Special Coatings:

Corrosion-resistant surface treatments including black oxide and nickel plating.

Lubrication Options:

Factory filling with cleanroom, high-temperature, or synthetic grease.

CAD Drawings & Datasheets

Technical files available upon request:
• 2D Engineering Drawings (PDF / DWG)
• 3D CAD Models (STEP / IGES)
• Complete Product Data Sheets (PDF)

FAQ

Q: How is preload generated in single-nut designs?

A: Single-nut models use oversized steel balls fitted between raceways to establish two-point contact and clear axial movement.

Q: Which preload class suits vertical mounting best?

A: P1 or P2 preload is recommended to counteract gravitational forces and avoid position slippage.

Q: What information is needed for shaft end machining?

A: Technical drawings must detail journal dimensions, thread specifications, bearing shoulder tolerances, and snap ring locations.

Q: Can these products operate in cleanroom environments?

A: Yes, units modified with low-outgassing greases and corrosion-resistant surface coatings are suitable for cleanrooms.

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Preloaded Ball Screws