Precision Ball Bearings: Load Capacity (Dynamic) 1-50 kN

Component Specifications

Definition

Precision ball bearings are specialized rolling-element bearings designed for linear motion applications, featuring precisely ground balls and raceways that maintain tight tolerances to ensure accurate, repeatable linear movement with minimal friction and wear in high-precision machinery.

Working Principle

Operates on the principle of rolling contact where precision-ground balls roll between hardened steel raceways, converting sliding friction into rolling friction to enable smooth linear motion with high accuracy and load capacity.

Materials

Chrome steel (AISI 52100/SUJ2) or stainless steel (AISI 440C) balls; hardened steel (HRC 58-62) raceways; optional ceramic (Si3N4) balls for specialized applications.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Width	4-20 mm
Speed Rating	Up to 30,000 rpm
Bore Diameter	3-50 mm
Outer Diameter	8-80 mm
Precision Grade	ABEC 5/7/9 or ISO P4/P2
Radial Clearance	C2 to CN (2-15 μm)
Operating Temperature	-30°C to +120°C
Load Capacity (Dynamic)	1-50 kN

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 492, DIN 625-1, ISO 199, DIN 5401

Parent Products

This component is used in the following industrial products

High-Precision Linear Motion Ball Bushing

A high-precision linear motion ball bushing is a critical component used in general-purpose machinery to facilitate smooth, accurate linear movement along shafts or rails.

View Product Details

Engineering Analysis

Risks & Mitigation

Contamination leading to premature wear
Improper installation causing misalignment
Inadequate lubrication resulting in overheating
Overloading beyond rated capacity
Corrosion in harsh environments

FMEA Triads

Trigger: Contamination from dust, chips, or moisture
Failure: Increased friction, pitting, and premature bearing failure
Mitigation: Use proper seals/shields, maintain clean environment, implement protective covers

Trigger: Improper installation or misalignment
Failure: Uneven load distribution, increased vibration, reduced accuracy
Mitigation: Follow manufacturer installation guidelines, use precision alignment tools, verify parallelism

Trigger: Inadequate or incorrect lubrication
Failure: Metal-to-metal contact, overheating, seizure
Mitigation: Use recommended lubricants, establish regular maintenance schedule, monitor temperature

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Radial runout: ≤ 0.002 mm; axial runout: ≤ 0.003 mm; dimensional tolerance: IT5/IT4 per ISO 286

Test Method

Vibration analysis per ISO 15242, dimensional inspection per ISO 1132, load testing per ISO 76, noise testing per ISO 13373

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 Precision Ball Bearings

Manufacturer profiles associated with Precision Ball Bearings.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What is the difference between precision ball bearings and standard ball bearings?

Precision ball bearings have tighter tolerances (ABEC 5/7/9 vs. ABEC 1/3), superior surface finish, controlled radial clearance, and higher dimensional accuracy for applications requiring exact positioning and minimal vibration.

How do I select the right precision grade for my application?

Select ABEC 5 for general precision applications, ABEC 7 for high-speed spindles and machine tools, and ABEC 9 for ultra-precision applications like medical devices or semiconductor equipment where nanometer-level accuracy is required.

What maintenance do precision ball bearings require?

Regular lubrication with appropriate grease (NLGI 2 lithium complex or synthetic), contamination protection with seals/shields, periodic inspection for wear or damage, and replacement when exceeding specified clearance limits.

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.

Precision Ball Bearings