INDUSTRY COMPONENT

Ball Nut

A precision mechanical component that converts rotary motion into linear motion in ball screw assemblies.

Component Specifications

Definition
The ball nut is a critical component in ball screw assemblies, featuring internal helical grooves that match the screw's threads. It contains recirculating ball bearings that roll between the screw and nut grooves, minimizing friction and enabling high-efficiency linear motion transmission with precise positioning capabilities.
Working Principle
Operates on the principle of recirculating ball bearings that roll along matching helical grooves in the screw and nut. As the screw rotates, the balls circulate through return tubes or deflectors, creating smooth linear motion with minimal friction and backlash.
Materials
Typically manufactured from bearing steel (GCR15/SUJ2), stainless steel (440C/304), or alloy steel with surface hardening (case hardening or induction hardening) to 58-62 HRC. Some applications use engineering plastics or bronze for specific requirements.
Technical Parameters
ParameterTypical rangeNotes & selection driver
Lead Accuracy±0.005-0.05mm/300mm
Preload TypesDouble nut, offset preload, oversized balls
Accuracy GradeC0-C10 (ISO 3408)
Recirculation SystemInternal deflector, external return tube, end cap return
Mounting ConfigurationsFlange type, cylindrical, square, round

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

Standards
ISO 3408, DIN 69051, JIS B1192

Parent Products

This component is used in the following industrial products

Engineering Analysis

Risks & Mitigation
  • Backlash development
  • Contamination ingress
  • Lubrication failure
  • Overload damage
  • Misalignment wear
  • Corrosion in harsh environments
FMEA Triads
Trigger: Contamination from dust, chips, or debris
Failure: Increased friction, ball track damage, premature wear
Mitigation: Install proper seals, use protective covers, implement regular cleaning protocols
Trigger: Inadequate or improper lubrication
Failure: Metal-to-metal contact, overheating, seizure
Mitigation: Follow manufacturer lubrication specifications, use appropriate lubricants, establish maintenance schedules
Trigger: Excessive axial or radial loads
Failure: Ball deformation, groove damage, structural failure
Mitigation: Adhere to load ratings, implement overload protection, ensure proper alignment

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance
Lead accuracy: ±0.005mm/300mm for precision grade, ±0.05mm/300mm for standard grade
Test Method
ISO 3408-4 for accuracy testing, DIN 69051 for dimensional verification, runout testing with dial indicators, preload measurement with torque gauges

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation
Request current drawings, revision history, and a signed specification sheet.
Manufacturing capability
Verify equipment lists, process limits, capacity, and representative production evidence.
Inspection readiness
Confirm test methods, calibrated equipment, sampling plans, and traceable reports.
Supplier transparency
Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Ball Nut

Manufacturer profiles associated with Ball Nut.

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Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

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Shaft Bearing
Precision component supporting rotating shafts in vibration motors to reduce friction and maintain alignment.
Seal Groove
Precision-machined groove in aluminum bearing housings designed to accommodate sealing elements for fluid containment and contamination prevention.

Frequently Asked Questions

What is the difference between single and double ball nuts?

Single ball nuts have basic functionality with some backlash, while double ball nuts consist of two nuts preloaded against each other to eliminate backlash and provide higher rigidity for precision applications.

How often should ball nuts be lubricated?

Lubrication intervals depend on operating conditions: continuous high-speed applications may require lubrication every 500-1000 hours, while standard applications typically need lubrication every 2000-3000 hours with appropriate grease or oil.

What causes ball nut failure?

Common failure causes include contamination ingress, inadequate lubrication, excessive preload, misalignment, overload conditions, and normal wear from extended operation.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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