Precision Bearing: Inner Diameter 10-50 mm, Width 9-23 mm

Component Specifications

Definition

A precision-engineered rolling-element bearing designed to minimize friction and maintain exact rotational alignment in theta-axis actuators, featuring tight dimensional tolerances, optimized raceway geometry, and specialized lubrication for high-speed, high-accuracy applications in industrial automation systems.

Working Principle

Utilizes precisely manufactured balls or rollers between inner and outer rings to facilitate smooth rotation with minimal friction and radial/axial play, maintaining consistent contact angles and preload to ensure accurate angular positioning and load distribution in theta-axis motion systems.

Materials

Bearing rings: AISI 52100 chrome steel (HRC 58-62) or ceramic (Si3N4); Rolling elements: AISI 52100 steel, ceramic (Si3N4/ZrO2), or hybrid ceramic-steel; Cage/retainer: Glass-fiber reinforced polyamide (PA66-GF25), brass (CuZn39Pb3), or steel; Lubrication: Synthetic ester-based grease (ISO VG 32-68) or oil-mist systems

Technical Parameters

Parameter	Typical range	Notes & selection driver
Width	9-23 mm
Speed Limit	15,000-30,000 rpm (grease), 40,000+ rpm (oil)
Inner Diameter	10-50 mm
Outer Diameter	30-90 mm
Precision Class	ABEC 5/7/9 (ISO P4/P2)
Radial Clearance	C2 to C0 (2-13 μm)
Static Load Rating	2.5-25 kN
Dynamic Load Rating	5-45 kN
Operating Temperature	-30°C to +120°C

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, ISO 199, DIN 625, DIN 5412

Parent Products

This component is used in the following industrial products

Theta-axis Actuator

A precision rotary actuator that controls the angular orientation (theta) of components during placement operations.

View Product Details

Articulation Joints

Articulation joints are precision mechanical components used in Coordinate Measuring Machine (CMM) arms.

View Product Details

Engineering Analysis

Risks & Mitigation

Incorrect preload causing premature wear
Contamination from improper sealing
Lubrication breakdown at high speeds
Misalignment during installation
Thermal expansion affecting clearance

FMEA Triads

Trigger: Inadequate sealing allowing contaminant ingress
Failure: Abrasive wear, increased friction, vibration, reduced accuracy
Mitigation: Use labyrinth seals or contact seals with appropriate IP ratings, implement clean installation procedures, regular maintenance checks

Trigger: Excessive preload during assembly
Failure: Overheating, accelerated fatigue, reduced service life
Mitigation: Follow manufacturer torque specifications, use calibrated tools, verify preload with dial indicators or torque meters

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Radial runout ≤ 5 μm, axial runout ≤ 3 μm per ISO 199 Class P4

Test Method

Vibration analysis per ISO 15242, dimensional verification per ISO 1132-2, endurance testing under simulated load conditions

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

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Manufacturers of Precision Bearing

Manufacturer profiles associated with Precision Bearing.

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Frequently Asked Questions

What distinguishes precision bearings from standard bearings in theta-axis actuators?

Precision bearings feature tighter dimensional tolerances (ABEC 5+), optimized raceway geometry, specialized materials, and controlled preload to minimize rotational error, vibration, and thermal expansion effects critical for accurate angular positioning.

How does bearing preload affect theta-axis actuator performance?

Proper preload eliminates internal clearance, increases stiffness, reduces deflection under load, and improves rotational accuracy but requires careful adjustment to avoid excessive friction, heat generation, and reduced bearing life.

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 Bearing