Rotation Bearing Surface: Diameter Tolerance H7/h6

Component Specifications

Definition

The rotation bearing surface is a critical machined interface on industrial drum bodies where radial or axial bearings are mounted to enable smooth, low-friction rotation. This surface must maintain precise dimensional tolerances, surface finish quality, and geometric accuracy to ensure proper bearing fit, alignment, and load distribution during operation.

Working Principle

Provides a stable, accurately positioned mounting surface for bearings that support rotational motion by minimizing friction through rolling elements (balls or rollers) while maintaining structural integrity under radial and axial loads.

Materials

Typically manufactured from medium-carbon steel (e.g., AISI 1045, 4140) or alloy steel, often heat-treated (hardened and tempered) to 45-55 HRC for wear resistance. Surface may be ground or honed to Ra 0.4-0.8 μm finish.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Hardness	45-55 HRC
Roundness	≤ 0.01 mm
Cylindricity	≤ 0.015 mm
Surface Roughness	Ra 0.4-0.8 μm
Diameter Tolerance	H7/h6

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 7154, ISO 1101

Parent Products

This component is used in the following industrial products

Drum Body

The main cylindrical body of an industrial indexing drum or rotary carousel that holds tooling pockets, fixture stations, or workpiece carriers in a precise circular layout.

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Engineering Analysis

Risks & Mitigation

Surface damage from improper handling
Geometric inaccuracies causing bearing misalignment
Corrosion in humid environments
Fatigue cracking under cyclic loads

FMEA Triads

Trigger: Improper machining tolerances
Failure: Bearing seizure or excessive clearance leading to vibration
Mitigation: Implement statistical process control (SPC) for machining operations and 100% dimensional verification

Trigger: Surface contamination during assembly
Failure: Abrasive wear and reduced bearing life
Mitigation: Clean room assembly procedures and protective coatings until bearing installation

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Geometric tolerances per ISO 1101, dimensional tolerances per ISO 286-2

Test Method

Coordinate measuring machine (CMM) verification, surface roughness testing per ISO 4287, hardness testing per ISO 6508

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 Rotation Bearing Surface

Manufacturer profiles associated with Rotation Bearing Surface.

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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 primary function of a rotation bearing surface on a drum body?

To provide a precise mounting location for bearings that support rotational movement while maintaining alignment and load distribution under operational conditions.

What surface finish is required for proper bearing performance?

Typically Ra 0.4-0.8 μm to ensure proper bearing contact and prevent premature wear while maintaining adequate lubrication retention.

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.

Rotation Bearing Surface