Cylinder Bore: Roundness ≤0.01 mm, Tolerance H7-H9 (ISO)

Component Specifications

Definition

The cylinder bore is the internal cylindrical surface of a pneumatic cylinder body, precisely machined to specific dimensional tolerances and surface finish requirements. It serves as the guiding channel for the piston assembly, providing a sealed environment for compressed air to act upon the piston. The bore's geometry, surface characteristics, and dimensional accuracy directly impact cylinder efficiency, sealing performance, and operational lifespan.

Working Principle

Provides a smooth, sealed cylindrical pathway for piston reciprocation, converting pneumatic pressure into linear mechanical motion through controlled air expansion/compression within the bore volume.

Materials

Typically machined from aluminum alloys (6061-T6, 7075-T6), stainless steel (304, 316), or hardened steel, with optional surface treatments (hard anodizing, chrome plating, nitriding) for wear resistance.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Hardness	Varies by material (e.g., 60-70 HRC for hardened steel)
Roundness	≤0.01 mm
Tolerance	H7-H9 (ISO)
Straightness	≤0.02 mm/m
Bore Diameter	10-200 mm (standard range)
Surface Finish	Ra 0.4-1.6 μm

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 6432, ISO 15552, DIN ISO 3320, DIN 24334

Parent Products

This component is used in the following industrial products

Cylinder Housing

The protective outer casing that encloses and supports the internal components of a lock cylinder.

View Product Details

Engineering Analysis

Risks & Mitigation

Bore wear leading to air leakage
Corrosion in humid environments
Contamination scoring bore surface
Dimensional inaccuracy causing binding

FMEA Triads

Trigger: Abrasive contamination in compressed air
Failure: Progressive bore scoring and increased friction
Mitigation: Install proper filtration (5 μm or finer), regular maintenance

Trigger: Inadequate lubrication
Failure: Accelerated wear of bore and seals
Mitigation: Use lubricated air or self-lubricating materials, monitor lubrication systems

Trigger: Misalignment during installation
Failure: Uneven wear and premature seal failure
Mitigation: Proper mounting alignment, use of flexible couplings, alignment verification

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

ISO 2768-mK for general dimensions, specific bore tolerances per ISO 6432/15552

Test Method

Air leakage test per ISO 19973, dimensional verification with bore gauges/CMM, surface roughness measurement with profilometer

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 Cylinder Bore

Manufacturer profiles associated with Cylinder Bore.

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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 surface finish is required for optimal cylinder bore performance?

Ra 0.4-1.6 μm is typical; smoother finishes reduce friction and wear, while rougher finishes may retain lubrication better but increase seal wear.

How does bore tolerance affect pneumatic cylinder efficiency?

Tighter tolerances (H7) minimize air leakage past seals, improving efficiency and response time, but increase manufacturing cost.

Can cylinder bores be repaired if worn or damaged?

Limited repair via honing or re-sleeving is possible, but excessive wear typically requires cylinder replacement for proper sealing.

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.

Cylinder Bore