INDUSTRY COMPONENT

Plunger Bore

Precision cylindrical bore in fluid chambers that guides plunger movement for pressure generation and fluid displacement.

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Component Specifications

Definition
A precisely machined cylindrical bore within a fluid chamber that serves as the guiding interface for a plunger's reciprocating motion. This critical component maintains dimensional accuracy and surface finish to ensure proper sealing, minimize friction, and enable efficient pressure generation or fluid displacement in hydraulic and pneumatic systems.
Working Principle
The plunger bore provides a smooth, dimensionally stable cylindrical pathway that guides the plunger's linear motion. As the plunger moves within the bore, it creates pressure differentials that displace fluid or generate force, with the bore's precision ensuring minimal clearance for effective sealing and efficient energy transfer.
Materials
Typically manufactured from hardened steel alloys (AISI 4140, 4340), stainless steel (316, 17-4PH), or specialized wear-resistant materials with hardness ranging from 45-60 HRC. Surface treatments may include nitriding, chrome plating, or DLC coatings for enhanced wear resistance.
Technical Parameters
  • Length Varies by application (typically 50-500 mm)
  • Roundness 0.003 mm
  • Straightness 0.01 mm/m
  • Surface Finish Ra 0.2-0.4 μm
  • Diameter Tolerance ±0.005 mm
  • Operating Pressure Up to 700 bar
Standards
ISO 3320, ISO 4394-1, DIN 24342, ISO 10766

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Plunger Bore.

plunger bore fluid chamber component hydraulic cylinder bore precision machining plunger guide cylindrical bore fluid power components industrial engineering Plunger Bore in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Fluid Chamber

The internal cavity within a pump head or fluid end where fluid is temporarily contained and pressurized during the pumping cycle.

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Engineering Analysis

Risks & Mitigation
  • Wear and scoring from abrasive contaminants
  • Corrosion in aggressive fluid environments
  • Thermal expansion affecting clearances
  • Fatigue cracking under cyclic loading
  • Improper installation causing misalignment
FMEA Triads
Trigger: Contaminant particles in hydraulic fluid
Failure: Abrasive wear and scoring of bore surface
Mitigation: Implement proper filtration systems, regular fluid analysis, and use of wear-resistant coatings
Trigger: Improper alignment during assembly
Failure: Uneven wear, increased friction, and premature failure
Mitigation: Use precision alignment tools, follow installation procedures, and conduct post-installation verification
Trigger: Corrosive fluid media
Failure: Surface pitting and material degradation
Mitigation: Select corrosion-resistant materials, apply protective coatings, and implement fluid compatibility testing

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
ISO 286-1 geometric tolerancing standards for cylindrical features, with specific application-dependent clearances typically ranging from 0.01-0.05 mm
Test Method
Coordinate measuring machine (CMM) verification, surface profilometry, pressure testing per ISO 10766, and dimensional inspection per ISO 14253-1

Buyer Feedback

★★★★☆ 4.7 / 5.0 (21 reviews)

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"The technical documentation for this Plunger Bore is very thorough, especially regarding technical reliability."

"Reliable performance in harsh Machinery and Equipment Manufacturing environments. No issues with the Plunger Bore so far."

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Frequently Asked Questions

What is the primary function of a plunger bore in industrial applications?

The plunger bore provides a precision-guided pathway for plunger movement, enabling controlled fluid displacement and pressure generation in hydraulic pumps, compressors, and fluid transfer systems.

How does surface finish affect plunger bore performance?

Optimal surface finish (typically Ra 0.2-0.4 μm) minimizes friction, reduces wear on both bore and plunger, improves sealing efficiency, and prevents fluid leakage in high-pressure applications.

What maintenance is required for plunger bores?

Regular inspection for wear, scoring, or corrosion; periodic cleaning to remove contaminants; and monitoring of dimensional tolerances to ensure continued performance and prevent system failures.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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Plug Body / Gate Plate Plunger Seal