Description

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Single Nut Ball Screws deliver continuous linear motion efficiency in a compact flanged profile compliant with DIN 69051 Form B standards. Built by combining precision-rolled or ground shafts with internal recirculation single nuts, these assemblies ensure high drive torque conversion and accurate positioning in limited axial spaces.

Key Features

01/

DIN 69051 Form B Interface
Standard mounting dimensions enable direct drop-in integration into existing machinery housings without structural modification.

02/

Gothic Arch Groove Profile
A 45-degree ball contact angle balances load distribution, reducing axial deformation under alternating thrust loads.

03/

Internal Recirculation System
Circulating paths contained entirely inside the nut body reduce the external diameter for tight spatial clearance.

04/

Induction-Hardened Shaft Tracks
Case depth hardening to HRC 58–62 maintains surface micro-structure integrity over extended duty cycles.

05/

Configurable End Machining
Precision turning and cylindrical grinding suited for standard bearing mounts or customized step journals.

Technical Specifications

Parameter	Specification
Shaft Outer Diameter	12 mm – 80 mm
Screw Pitch (Lead)	4 mm – 20 mm
Accuracy Class	JIS C5, JIS C7
Nut Mounting Style	Single Flanged (SFU)
Hardness Rating	HRC 58 – 62
Shaft Material	SCM420 Alloy Steel, CF53 Carbon Steel
Rolling Element	GCr15 Bearing Steel Balls
Axial Play	C7: ≤ 0.05 mm
Thermal Limits	-20°C to +80°C

Product Configuration

Threaded Shaft: Thread-rolled or ground carbon steel shaft available in specified lengths up to 6,000 mm.

Flanged Nut: Single-body housing with bolt-circle mounting holes, lubricant inlet, and built-in wiper seals.

Recirculation Components: Steel balls paired with internal return tubes for smooth continuous rolling paths.

Wiper Seals: Dual-end NBR synthetic wipers that retain grease while shedding ambient dust and debris.

Lubrication Fitting: Threaded port supporting manual grease nipples or central fluid tubing.

Precision & Lead Tolerance

Accuracy Grade	Travel Deviation (e300)	Axial Play	Manufacturing Method
JIS C5	± 0.018 mm / 300 mm	≤ 0.02 mm	Precision Rolling / Thread Grinding
JIS C7	± 0.050 mm / 300 mm	≤ 0.05 mm	Cold Thread Rolling

Preload Options

Standard Clearance (P0)
Axial clearance up to 0.05 mm. Minimizes friction torque and operating heat in constant-speed linear transfer paths.

Reduced Clearance (P1)
Selective ball sorting limits axial clearance to ≤ 0.02 mm, providing higher system stiffness without increasing drive resistance.

Model Selection & Dimensions

Model	Diameter (mm)	Lead (mm)	Ball Size (mm)	Nut OD (mm)	Flange OD (mm)	Dynamic Load (kN)	Static Load (kN)
SFU1204	12	4	2.381	24	40	6.2	12.8
SFU1605	16	5	3.175	28	48	13.8	30.5
SFU1610	16	10	3.175	28	48	13.5	30.1
SFU2005	20	5	3.175	36	58	15.6	38.8
SFU2505	25	5	3.175	40	62	17.2	49.1
SFU2510	25	10	4.762	40	62	26.5	65.2
SFU3205	32	5	3.175	50	80	21.1	71.3
SFU3210	32	10	6.350	50	80	48.2	120.5
SFU4010	40	10	6.350	63	93	54.1	152.0
SFU5010	50	10	6.350	75	110	62.8	198.4

Manufacturing Sequence

Material Verification: Spectrometric heat analysis ensures raw steel stock matches chemistry specifications before processing.
Thread Rolling / Grinding: Thread profiles formed on dedicated CNC equipment for lead consistency.
Induction Hardening: High-frequency thermal treatment hardens outer rolling tracks while keeping core structure ductile.
Hydraulic Straightening: Multi-point automated measurement corrects total indicator reading to within 0.02 mm/m.

Internal Nut Grinding: Nut thread profiles ground on internal CNC thread grinders for ball track matching.
Cleanroom Assembly: Steel balls sorted by precise diameter classes and fitted in climate-controlled environments.
Laser Metrology: Laser interferometers map lead error curves across total screw travel.

Industry Applications

Machining Centers: Drives table axes, delivering constant linear feed under variable cutting forces.

Laser Cutting Tables: Supports high feed rates across broad axis spans in plate cutting machinery.

Automated Pick-and-Place: Converts rotary drive into precise multi-axis positioning for packaging lines.

Medical Positioning Equipment: Fits compact internal cavities in diagnostic apparatus and patient tables.

Inspection Fixtures: C5 ground options supply steady feed control for automated optical scanning stages.

Quality Controls

Metrology Documentation:

Laser pitch verification charts and surface hardness inspection sheets provided upon request.

Raw Material Traceability:

Certified carbon and alloy steel stock sourced directly with mill test certificates.

In-House Processing:

Thread rolling, thermal treatment, machining, and grinding performed under one quality management system.

Controlled Runout Limits:

Shaft straightness strictly held to 0.02 mm/m to suppress operational vibration at high speed.

Custom Engineering

Length Specification: Shafts cut and finished up to 6,000 mm according to application requirements.

Journal Machining: Threaded ends, keyways, snap ring grooves, and shoulders machined from supplied 2D engineering drawings.

Surface Treatments: Black oxide, manganese phosphate, or protective plating for corrosion protection.

Modified Flanges: Custom mounting hole circles or modified flange flats to clear surrounding structures.

Application Greasing: Supplied pre-greased with specialty synthetic, high-load, or low-outgassing formulations.

CAD Models & Technical Files

Integrate exact dimensional models into mechanical assemblies:

2D Layout Drawings:

PDF and DWG formats with full mounting dimensions and tolerance details.

3D CAD Assemblies:

STEP and IGES files formatted for direct placement into major mechanical design packages.

Technical Datasheets:

Full load calculations, buckling limits, maximum critical speeds, and installation tolerances.

FAQ

Q: What is the functional difference between single and double nut designs?

A: Single nuts utilize a single housing with internal return components, achieving a compact form factor for standard positioning tasks. Double nuts use two separate bodies separated by a spacer to create mechanical tension, completely removing backlash for dynamic reversing loads.

Q: What shaft end profiles can be machined?

A: End profiles can be machined to standard fixed-side or supported-side support configurations. Options include keyways, retaining ring slots, internal wrench flats, and custom threaded journals produced to engineering drawings.

Q: Can axial clearance be reduced in a single nut configuration?

A: Axial clearance can be limited to ≤ 0.02 mm by sorting and fitting oversized steel balls during assembly, providing minimal axial play without requiring a double nut structure.

Q: How is critical speed evaluated for longer shaft lengths?

A: Critical speed is determined by shaft diameter, total length between supports, and end fixing methods. Operating speeds should be designed to stay below 80 percent of the calculated critical speed to prevent shaft whipping.

Q: What is the recommended re-lubrication frequency?

A: Grease should be added through the nut lubrication nipple every 300 to 500 operating hours, or every few months under normal operating conditions. High-duty cycle automated systems should use centralized continuous lubrication.

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