INDUSTRY COMPONENT

Internal Bore Surface

Precision-machined interior surface of a cylinder barrel that guides piston movement and contains hydraulic fluid.

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Component Specifications

Definition
The internal bore surface is the precisely finished cylindrical interior of a cylinder barrel in hydraulic or pneumatic systems. This critical component provides the sliding interface for the piston and piston seals, maintaining fluid containment and ensuring linear motion with minimal friction. Surface finish, dimensional accuracy, and geometric tolerances directly impact system efficiency, leakage prevention, and component longevity.
Working Principle
The internal bore surface functions as both a guiding mechanism and sealing interface. During operation, the piston moves along this surface while hydraulic pressure acts upon it. The surface must maintain consistent clearance with piston seals to prevent fluid bypass while minimizing friction through optimized surface texture and hardness properties.
Materials
Typically manufactured from cold-drawn seamless steel tubing (ASTM A519), hardened steel (42CrMo4), or stainless steel (304/316). Common specifications include: hardness 58-62 HRC for hardened surfaces, surface roughness Ra 0.2-0.4 μm, and straightness tolerance of 0.02 mm per 300 mm length.
Technical Parameters
  • Hardness 58-62 HRC
  • Roundness 0.01 mm max
  • Straightness 0.02 mm/300 mm
  • Surface Roughness Ra 0.2-0.4 μm
  • Surface Treatment Chrome plating (20-40 μm) or nitriding
  • Diameter Tolerance H8/H9
Standards
ISO 3320, ISO 4394-1, DIN 24334, DIN 24540

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Internal Bore Surface.

cylinder bore surface hydraulic cylinder barrel internal machining bore finishing surface roughness honing process chrome plating cylinder specifications Internal Bore Surface Internal Bore Surface in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Cylinder Barrel

The main cylindrical body of a hydraulic actuator cylinder that contains the hydraulic fluid and guides the piston movement.

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Engineering Analysis

Risks & Mitigation
  • Surface scoring from contamination
  • Corrosion in harsh environments
  • Geometric distortion under load
  • Premature seal wear from improper finish
FMEA Triads
Trigger: Contaminants in hydraulic fluid
Failure: Surface scoring and increased friction
Mitigation: Implement proper filtration systems (10 μm or better), regular fluid analysis, and contamination control procedures
Trigger: Inadequate surface hardness
Failure: Accelerated wear and reduced service life
Mitigation: Specify proper material grades, apply surface treatments (chrome plating/nitriding), and conduct hardness testing
Trigger: Geometric inaccuracies (taper, ovality)
Failure: Seal leakage and uneven wear patterns
Mitigation: Implement precision honing processes, use SPC monitoring, and conduct comprehensive geometric verification

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Diameter tolerance H8/H9 per ISO 286, roundness ≤0.01 mm, straightness ≤0.02 mm/300 mm
Test Method
Coordinate measuring machines (CMM) for geometry, surface profilometers for roughness, ultrasonic thickness gauges for plating, and pressure testing for seal integrity

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What surface finish is required for hydraulic cylinder bores?

Hydraulic cylinder bores typically require Ra 0.2-0.4 μm surface finish achieved through honing. This provides optimal seal performance while minimizing friction and wear.

Why is chrome plating applied to cylinder bores?

Chrome plating (20-40 μm thickness) provides corrosion resistance, reduces friction, increases hardness, and extends service life by protecting against abrasive wear and chemical attack from hydraulic fluids.

How is bore straightness measured and controlled?

Bore straightness is measured using laser alignment systems or precision mandrels with dial indicators. Control is maintained through proper machining techniques, stress relief, and thermal management during manufacturing.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

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.

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