Bearing Caps: Weight Range 1.5-3.5 kg, Bolt Size M10-M14

Component Specifications

Definition

Bearing caps are structural components designed to house and secure tapered roller or ball bearings within a differential carrier assembly. They provide precise axial and radial positioning of bearings, ensuring proper gear mesh alignment, load distribution, and lubrication retention in automotive differential systems. These caps withstand significant torsional and axial forces while maintaining dimensional stability under thermal cycling.

Working Principle

Bearing caps function by creating a rigid housing that constrains bearing outer races, preventing axial movement while allowing controlled radial expansion. They distribute operational loads evenly across the bearing surface, maintain preload settings through precise bolt torque specifications, and provide sealing surfaces for gaskets or seals to retain lubricants.

Materials

Typically forged or cast alloy steel (e.g., SAE 4140, 4340) or ductile iron (e.g., Grade 65-45-12). Heat treatment to 28-32 HRC for strength. Machined surfaces have Ra 1.6-3.2 μm finish.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Bolt Size	M10-M14
Weight Range	1.5-3.5 kg
Bolt Circle Diameter	120-180 mm
Flatness Requirement	0.05 mm max
Torque Specification	80-120 Nm
Bearing Bore Tolerance	H7

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 286-2, DIN 3760, SAE J429

Parent Products

This component is used in the following industrial products

Differential Carrier

The housing that contains and supports the differential gears and bearings in a front differential assembly.

View Product Details

Engineering Analysis

Risks & Mitigation

Bolt fatigue failure
Bearing seat wear leading to misalignment
Thermal distortion under heavy load
Improper torque causing bearing preload loss

FMEA Triads

Trigger: Insufficient bolt torque
Failure: Bearing cap loosening leading to bearing movement and gear misalignment
Mitigation: Use calibrated torque wrenches with angle measurement, apply thread locking compound, implement torque-to-yield bolts

Trigger: Thermal cycling stress
Failure: Micro-cracking in high-stress areas leading to catastrophic failure
Mitigation: Implement finite element analysis in design, use stress-relieved materials, add radius to sharp corners

Trigger: Improper bearing seat machining
Failure: Bearing misalignment causing premature bearing failure and gear noise
Mitigation: Maintain H7 tolerance on bearing bores, implement CMM verification, use honing for final finish

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Bearing bore: H7, Bolt holes: H12, Flatness: 0.05 mm, Parallelism: 0.03 mm

Test Method

Dimensional verification via CMM, magnetic particle inspection for cracks, bolt hole circularity testing, thermal cycling validation

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 Bearing Caps

Manufacturer profiles associated with Bearing Caps.

Sourcing Bearing Caps from China?

Tell us your specification and target quantity — we will match it against manufacturer records and come back with the factories that fit.

Request manufacturers We manufacture this

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

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

Related Components

Brake Disc (Rotor)

A rotating disc in disc brake systems that creates friction with brake pads to slow or stop vehicle motion.

Main Bearing Journals

Main bearing journals are precision-machined cylindrical surfaces on a crankshaft that rotate within main bearings to support rotational motion in internal combustion engines.

Surround

Structural component that encloses and protects suspension system elements while providing mounting points and structural integrity.

Brake Disc/Rotor

A rotating disc component in disc brake systems that converts kinetic energy into thermal energy through friction to slow or stop vehicle motion.

Frequently Asked Questions

What is the primary function of a bearing cap in a differential carrier?

The bearing cap secures the differential bearings in precise alignment, distributes operational loads, maintains bearing preload, and provides sealing surfaces for lubricant retention.

Why are bearing caps typically made from alloy steel?

Alloy steel provides the necessary strength-to-weight ratio, fatigue resistance, and dimensional stability required to withstand differential torque loads and thermal cycling without deformation.

How often should bearing caps be inspected?

During every differential service interval (typically 50,000-100,000 km) for cracks, bolt hole elongation, bearing seat wear, and flatness verification.

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.

Bearing Caps