INDUSTRY COMPONENT

End Fittings

End fittings are precision-engineered connectors that secure and seal the ends of gas lift cylinders, enabling reliable fluid transfer and structural integrity in industrial applications.

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Component Specifications

Definition
End fittings are critical components in gas lift cylinders designed to provide secure attachment points at both ends of the cylinder barrel. They serve multiple functions including: creating a pressure-tight seal to contain compressed gas, providing threaded or flanged connections for mounting to external structures, incorporating ports for gas inlet/outlet, and housing sealing elements like O-rings or gaskets. These fittings must withstand cyclic pressure loads, mechanical stresses, and environmental factors while maintaining precise dimensional tolerances for proper cylinder operation.
Working Principle
End fittings operate by creating a mechanical interface between the cylinder barrel and external connections. The fitting's design ensures proper alignment and sealing through precision machining of mating surfaces. When installed, the fitting compresses sealing elements against the cylinder barrel, creating a pressure-tight barrier. Threaded or bolted connections provide mechanical strength, while internal passages allow controlled gas flow into and out of the cylinder chamber during operation.
Materials
Typically manufactured from high-strength materials including: carbon steel (AISI 1045, 4140), stainless steel (304, 316), aluminum alloys (6061-T6), or specialized alloys for corrosive environments. Heat treatment processes (quenching and tempering) are often applied to achieve required hardness (typically HRC 28-35) and tensile strength (minimum 800 MPa for steel variants).
Technical Parameters
ParameterTypical rangeNotes & selection driver
HardnessHRC 28-35
Thread TypeMetric (M12-M36) or UNF/UNC
Surface FinishRa 0.8-1.6 μm
Pressure Rating150-300 bar (2175-4350 psi)
Temperature Range-40°C to 120°C
Corrosion ResistanceSalt spray test > 500 hours

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 11926, DIN 3852, ISO 8434, SAE J514

Parent Products

This component is used in the following industrial products

Gas Lift Cylinder

A gas lift cylinder is a key component in ergonomic office chairs that enables smooth, controlled vertical adjustment of the seat height.

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Lead Screw or Piston Rod

A linear motion component that converts rotary motion into precise linear displacement within an adjustment actuator.

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Tension Spring Assembly

A mechanical assembly consisting of a tension spring and its mounting hardware designed to store and release energy through extension.

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Engineering Analysis

Risks & Mitigation
  • Thread failure under excessive torque
  • Seal degradation from chemical exposure
  • Stress corrosion cracking
  • Improper installation causing leaks
  • Material incompatibility with operating media
FMEA Triads
Trigger: Insufficient thread engagement
Failure: Fitting detachment under pressure
Mitigation: Implement torque-controlled installation procedures and visual thread inspection
Trigger: Material fatigue from cyclic loading
Failure: Crack propagation leading to catastrophic failure
Mitigation: Use materials with appropriate fatigue strength and implement regular non-destructive testing
Trigger: Chemical attack on sealing surfaces
Failure: Gas leakage and pressure loss
Mitigation: Select chemically compatible materials and implement protective coatings

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance
±0.05 mm for critical dimensions, H7/g6 fit for sealing surfaces
Test Method
Pressure testing per ISO 4413, leak testing with helium mass spectrometry, dimensional verification with CMM

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.

Compare the published product scope and source details, then include your specifications and quantity in an enquiry.

Manufacturers of End Fittings

Manufacturer profiles associated with End Fittings.

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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 are the main failure modes of end fittings in gas lift cylinders?

Common failure modes include thread stripping due to improper torque, seal degradation from chemical exposure, stress cracking from cyclic loading, and corrosion pitting in harsh environments.

How do I select the right end fitting for my gas lift application?

Consider operating pressure, temperature range, media compatibility, connection type, material strength requirements, and compliance with relevant industry standards. Always verify dimensional compatibility with your cylinder barrel.

What maintenance is required for end fittings?

Regular inspection for leaks, torque verification of fasteners, seal replacement during overhaul, and corrosion protection. Follow manufacturer's recommended maintenance intervals based on operating cycles.

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.

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