Description

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Flanged Ball Screws feature an integrated DIN 69051 mounting flange on the nut, delivering maximum axial rigidity and simplified mounting for vertical and horizontal motion systems. Built with induction-hardened alloy steel and precision-ground or rolled ball tracks, these assemblies provide smooth rolling contact, minimal torque fluctuation, and repeatable positioning accuracy.

Key Features

01/

Integrated Mounting Flange: Direct bolting to machine housings without external mounting brackets.

02/

Ground and Rolled Options: Available in ISO Class C3 to C7 precision levels.

03/

Zero-Backlash Preload: Internal ball selection eliminates axial play for accurate reverse motion.

04/

Gothic Arch Groove Geometry: Optimizes contact stress and dynamic load capacity under bi-directional loads.

05/

Integrated Wiper Seals: Synthetic dust wipers protect raceways from particulate contamination.

Technical Specifications

Parameter	Specification
Screw Diameter Range	12 mm – 80 mm
Lead Range	4 mm – 20 mm
Precision Grade	ISO Class C3, C5, C7
Shaft Material	SCM440 Alloy Steel
Surface Hardness	HRC 58 – 62
Flange Standard	DIN 69051 Form B / SFU
Axial Clearance	0.005 mm (Preloaded) / 0.05 mm (Standard)
Operating Temperature	-20°C to +80°C

Product Configuration

Nut Type: SFU / DIN Flanged Single Nut with internal circulation return tubes.

Thread Direction: Right-hand standard.

End Machining: Standard journal profiles or custom stepped profiles per drawing.

Lubrication: Factory-applied lithium-based grease or oil-mist ports.

Accuracy & Lead

Accuracy Class	Cumulative Lead Error (μm/300mm)	Surface Finish (Ra)	Application
C3	0.008	0.2 μm	CNC Machining Centers, Precision Grinders
C5	0.018	0.4 μm	Semiconductor Equipment, Measuring Axis
C7	0.050	0.8 μm	General Industrial Automation, Transfer Units

Preload

Preload Code	Preload Force	Axial Play	Application Fit
Z0	None	0.05 mm	Vertical transport, non-reversing drives
Z1	0.02 Cₐ	0.00 mm	Standard automation axis, linear positioning
Z2	0.05 Cₐ	0.00 mm	High-rigidity milling axes, heavy load operations

Dimensions & Model Selection

Model No.	Screw Dia (d)	Lead (p)	Ball Dia (Dw)	Flange Dia (Df)	Dynamic Load Ca (kN)	Static Load C0a (kN)
SFU01605	16 mm	5 mm	3.175 mm	48 mm	13.8	30.5
SFU02005	20 mm	5 mm	3.175 mm	58 mm	15.6	38.8
SFU02505	25 mm	5 mm	3.175 mm	62 mm	17.2	49.1
SFU03205	32 mm	5 mm	3.175 mm	80 mm	21.1	71.3
SFU03210	32 mm	10 mm	6.350 mm	80 mm	33.9	90.2
SFU04010	40 mm	10 mm	6.350 mm	93 mm	46.8	136.5

Manufacturing Process

Material Verification:

Spectrometric steel composition analysis and ultrasonic flaw testing.

Induction Hardening:

Controlled heat treatment achieving HRC 58–62 with 1.5–3.0 mm case depth.

Thread Grinding & Rolling:

CNC thread machining ensuring exact profile geometry.

Nut Bore Grinding:

Internal grinding maintains raceway alignment relative to the flange face.

Precision Ball Sorting:

Micro-sorted steel balls paired to set target axial clearance.

Laser Testing:

100% pitch lead verification and dynamic torque testing prior to shipment.

Applications of Flanged Ball Screws

CNC Machining Centers: Drives positioning axes requiring high axial rigidity.

Laser Cutting Machinery: Converts high rotational torque to fast linear displacement.

Semiconductor Systems: Delivers smooth linear movement in automated cleanroom cells.

Medical Packaging Systems: Executes precise positioning in high-speed form-fill-seal machines.

Quality & Engineering Standards

Traceable Metallurgy:

Certified high-carbon alloy steel batches ensure consistent core toughness.

Flange Concentricity:

Total indicator runout between screw axis and mounting face kept within 0.010 mm.

Verified Documentation:

Pitch lead charts, hardness profiles, and torque test reports supplied per order batch.

In-House End Machining:

Shaft ends turned and ground on CNC lathes to exact bearing fit tolerances.

Customization & OEM

Shaft lengths produced up to 6000 mm.
Machined journal configurations for standard bearing support housings.
Surface treatment options: Black oxide, phosphating, or nickel plating.
Custom flange bolt hole patterns and keyway dimensions.

CAD Drawings & Technical Files

Engineering files and dimensional specifications are available for direct CAD integration.
Download 2D Drawings (PDF, DXF)
Download 3D CAD Models (STEP, IGES)
Download Selection Manual (PDF)

FAQ

Q: What is the distinction between flanged and cylindrical nut ball screws?

A: Flanged nuts contain an integral mounting flange bolted directly to flat housing surfaces, eliminating the need for outer lock brackets and resisting higher axial tilting moments.

Q: Can ball screws be supplied with custom end-machining?

A: Shaft ends are turned, ground, and threaded according to customer-supplied engineering drawings to fit fixed and floating bearing support units.

Q: How is the appropriate accuracy grade selected?

A: Grade C7 (0.050 mm / 300 mm) applies to general transport automation. Grade C5 (0.018 mm / 300 mm) covers standard automated axes. Grade C3 (0.008 mm / 300 mm) serves high-precision grinding and milling axes.

Q: What lubrication is recommended for flanged ball screw nuts?

A: Lithium-soap greases with extreme-pressure additives are standard. Re-lubrication frequency depends on stroke velocity, duty cycle, and operating temperatures.

Q: What is the typical production lead time for orders?

A: Standard catalog configurations ship in 7 to 10 working days. Orders requiring custom end-machining or precision ground threads (C3/C5) deliver in 15 to 20 working days.

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