Component Documentation: Bore Diameter 10-500 mm

Component Specifications

Definition

A bearing is a machine element that constrains relative motion to only the desired motion and reduces friction between moving parts. The design of the bearing may provide for free linear movement of the moving part or for free rotation around a fixed axis; or, it may prevent motion by controlling the vectors of normal forces that bear on the moving parts. Most bearings facilitate the desired motion by minimizing friction. Bearings are classified broadly according to the type of operation, the motions allowed, or the directions of the loads (forces) applied to the parts.

Working Principle

Bearings operate on the principle of replacing sliding friction with rolling friction or fluid film friction. Rolling element bearings use balls or rollers between races to minimize contact area and friction. Plain bearings use a sliding surface with lubrication. The fundamental working principle involves supporting loads while allowing relative motion with minimal energy loss through friction reduction.

Materials

Bearing rings/races: Chrome steel (AISI 52100/SUJ2), stainless steel (AISI 440C), ceramic (silicon nitride). Rolling elements: Same as rings or ceramic balls. Cages/retainers: Steel, brass, polyamide, phenolic resin. Seals: Nitrile rubber, fluoroelastomer, PTFE. Lubrication: Mineral oil, synthetic oil, grease with lithium/calcium complex thickeners.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Width	9-160 mm
Clearance	C2/C0/C3/C4/C5
Speed Limit	500-20000 rpm
Bore Diameter	10-500 mm
Precision Grade	ABEC 1/3/5/7/9
Outside Diameter	30-620 mm
Static Load Rating	5-500 kN
Dynamic Load Rating	10-1000 kN
Operating Temperature	-30°C to +150°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 15, ISO 76, ISO 281, DIN 625, DIN 628

Parent Products

This component is used in the following industrial products

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Engineering Analysis

Risks & Mitigation

Catastrophic machinery failure
Production downtime
Safety hazards from flying debris
Increased energy consumption
Secondary damage to connected components

FMEA Triads

Trigger: Contamination from dirt, dust, or water ingress
Failure: Abrasive wear, pitting, and increased friction leading to overheating and seizure
Mitigation: Use proper seals/shields, maintain clean environment, implement contamination control procedures

Trigger: Inadequate or improper lubrication
Failure: Metal-to-metal contact, overheating, premature wear, and eventual seizure
Mitigation: Follow manufacturer lubrication specifications, use correct lubricant type/quantity, establish regular maintenance schedule

Trigger: Improper installation (hammer blows, misalignment, incorrect fits)
Failure: Brinnelling, raceway damage, reduced lifespan, vibration issues
Mitigation: Use proper installation tools, follow mounting procedures, verify alignment, use appropriate interference fits

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

ISO 492: Normal class (standard tolerance), Class 6 (higher precision), Class 5 (precision), Class 4 (high precision), Class 2 (ultra precision)

Test Method

Vibration analysis (ISO 15242), noise testing (ISO 13373), dimensional verification (ISO 1132), hardness testing (ISO 6508), material composition analysis (spectroscopy)

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.

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Manufacturers of Component Documentation

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Frequently Asked Questions

What is the difference between ball bearings and roller bearings?

Ball bearings use spherical rolling elements and are optimized for high-speed applications with moderate loads. Roller bearings use cylindrical, tapered, or spherical rollers and handle higher radial/axial loads at lower speeds due to larger contact areas.

How often should industrial bearings be lubricated?

Lubrication intervals depend on operating conditions: typically 3-12 months for grease-lubricated bearings in standard applications. High-speed or high-temperature applications may require continuous oil lubrication or more frequent greasing. Follow manufacturer specifications and monitor condition.

What causes bearing failure in industrial machinery?

Common causes include improper installation (25%), contamination (20%), inadequate lubrication (35%), overload (10%), and misalignment (10%). Regular maintenance, proper handling, and correct installation procedures can prevent most failures.

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.

Component Documentation