Recirculating Ball Nut

Product Specifications

Technical details and manufacturing context for Recirculating Ball Nut

Definition

The recirculating ball nut is a critical component within the 'Sector Gear / Recirculating Ball Nut' assembly. It functions as the moving element on a ball screw, housing the recirculating ball bearings that roll between the nut and the screw shaft. This design enables high-efficiency, low-friction linear motion transmission, essential for precise positioning in machinery. The nut contains a helical raceway that matches the thread of the ball screw. Ball bearings are loaded into this raceway. As the screw rotates, the balls roll along the raceway, causing the nut to move linearly along the screw's axis. A return tube or deflector inside the nut guides the balls from the end of the raceway back to the beginning, creating a continuous recirculating path, which minimizes friction and wear compared to a standard acme or trapezoidal thread nut. Materials on file include bearing steel (e.g., GCr15/52100), case-hardened steel, and stainless steel. Standard parameters per ISO 3408 include nominal diameter 16–80 mm, lead 5–40 mm, dynamic load rating 8–120 kN, static load rating 20–300 kN, travel accuracy grade C3–C7, backlash ≤0.05 mm, maximum rotational speed 3000–6000 rpm, operating temperature -20–80 °C, lubrication grease or oil, material GCr15 or 42CrMo4, surface hardness 58–62 HRC, and weight 0.5–15 kg. These values are directory reference ranges; verify model-specific values with the manufacturer.

Working Principle

The nut contains a helical raceway that matches the thread of the ball screw. Ball bearings are loaded into this raceway. As the screw rotates, the balls roll along the raceway, causing the nut to move linearly along the screw's axis. A return tube or deflector inside the nut guides the balls from the end of the raceway back to the beginning, creating a continuous recirculating path, which minimizes friction and wear compared to a standard acme or trapezoidal thread nut.

Common Materials

Bearing Steel (e.g., GCr15/52100), Case-Hardened Steel, Stainless Steel

Technical Parameters

Parameter	Typical range	Notes & selection driver
Nominal Diameter	16–80 mm	Standard sizes; custom diameters available.ISO 3408
Lead	5–40 mm	Determines linear travel per revolution.ISO 3408
Dynamic Load Rating	8–120 kN	Basis for fatigue life calculation.ISO 3408
Static Load Rating	20–300 kN	Maximum load without permanent deformation.ISO 3408
Travel Accuracy Grade	C3–C7	C3 for high precision, C7 for general use.ISO 3408-3
Backlash	≤0.05 mm	For preloaded nuts, backlash is zero.ISO 3408
Maximum Rotational Speed	3000–6000 rpm	Limited by critical speed of screw.
Operating Temperature	-20–80 °C	For standard steel; high-temp versions available.
Lubrication	Grease or oil	Grease for most applications; oil for high speed.
Material	GCr15 or 42CrMo4	Bearing steel for balls; alloy steel for nut body.GB/T 18254, EN 10083
Surface Hardness	58–62 HRC	Ensures wear resistance.ISO 18265
Weight	0.5–15 kg	Depends on size and flange design.

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Nut Body Part
The main structural housing that contains the ball raceways and return system.

Material: Steel
Ball Return Tube/Deflector Part
A channel or component that guides the balls from the end of the raceway back to the start, completing the recirculation loop.

Material: Steel or Plastic
Ball Bearings Part
Precision spheres that roll between the nut and screw raceways to transmit force with minimal friction.

Material: Bearing Steel (Chrome Steel)
Wiper/Seal Part
Keeps contaminants out and retains lubrication within the nut assembly.

Material: Rubber or Synthetic Polymer

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Recirculating Ball Nut.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Sector Gear / Recirculating Ball Nut

View system integration details

Manufacturers of Recirculating Ball Nut

Manufacturer profiles associated with Recirculating Ball Nut.

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Frequently Asked Questions

What is the function of a recirculating ball nut?

It converts rotary motion of a ball screw into linear motion with minimal friction, using recirculating ball bearings.

What materials are commonly used?

Bearing steel (e.g., GCr15/52100), case-hardened steel, and stainless steel are listed in the directory.

What standards apply?

ISO 3408 series for dimensions and load ratings; ISO 3408-3 for accuracy grades. Verify compliance with the manufacturer.

How do I select the right nut?

Consider nominal diameter, lead, load ratings, accuracy grade, and operating conditions. Confirm values with the supplier.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Max axial load: 50-500 kN depending on size, Max radial load: 10-20% of axial capacity
other spec:	Speed: Up to 100 mm/s linear velocity, Backlash: 0.01-0.05 mm (preloaded), Life expectancy: 10,000-50,000 km travel distance
temperature:	-20°C to +120°C (standard), up to +200°C with special seals/lubrication

Product Specifications

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