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Compression Fitting Component – Machinery and Equipment Manufacturing

Component Specifications

Definition

A compression fitting is a type of coupling used to connect two tubes or a tube to a component in fluid and gas systems. It consists of a body, a nut, and one or two ferrules (sleeves). When the nut is tightened, it compresses the ferrule(s) onto the tubing, creating a strong, leak-tight seal through mechanical deformation without requiring soldering, welding, or threading. It is widely used in applications requiring reliable, removable connections under pressure or vacuum.

Working Principle

The working principle relies on mechanical compression. As the nut is tightened onto the fitting body, it forces the ferrule(s) axially forward. This action causes the ferrule(s) to deform radially inward, gripping the tubing tightly and forming a seal against both the tubing and the fitting body. The seal is achieved through metal-to-metal contact and plastic deformation of the ferrule, ensuring no fluid or gas leakage.

Materials

Typically made from brass, stainless steel (e.g., 316SS), carbon steel, or plastic (e.g., PVC, nylon). Ferrules are often softer than the fitting body to ensure proper deformation. Material selection depends on the fluid/gas compatibility, pressure, temperature, and corrosion resistance requirements.

Technical Parameters

Seal Type Single or double ferrule
Reusability Limited reusability; ferrules may need replacement
Connection Type Male/female NPT, BSPP, SAE, or straight thread
Pressure Rating Up to 10,000 psi (690 bar) for high-pressure designs
Tubing OD Range 1/8" to 1" (3 mm to 25 mm)
Temperature Range -65°F to 400°F (-54°C to 204°C), varies by material

Standards

ISO 8434-1, DIN 2353, SAE J514

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Compression Fitting.

Parent Products

This component is used in the following industrial products

Chemical Reactor Temperature Sensor Probe

Temperature measurement probe for chemical reactor vessels

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Precision Thermocouple Probe Assembly

Temperature sensing assembly for industrial measurement and control systems

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Engineering Analysis

Risks & Mitigation

Over-tightening can damage ferrule or tubing
Improper tubing preparation (e.g., burrs) causes leaks
Material incompatibility leads to corrosion
Reuse without inspection risks failure

FMEA Triads

Trigger: Over-tightening during installation
Failure: Ferrule or tubing cracks, causing leaks or system failure
Mitigation: Use torque wrenches, follow manufacturer specifications, and train personnel on proper installation techniques

Trigger: Vibration or thermal cycling
Failure: Loosening of the nut, leading to leaks
Mitigation: Use double ferrule fittings, apply thread-locker (if compatible), and implement regular maintenance checks

Trigger: Incorrect tubing material or size
Failure: Poor seal formation or fitting detachment
Mitigation: Verify tubing specifications match fitting requirements and conduct material compatibility tests

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance

Tubing OD tolerance typically ±0.005 inches (±0.13 mm); fitting dimensions per ISO/DIN standards

Test Method

Pressure testing (e.g., hydrostatic or pneumatic leak test per ISO 5208), visual inspection for defects, and torque verification during installation

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

Can compression fittings be reused?

Limited reusability is possible, but ferrules may deform permanently. For critical applications, it is recommended to replace ferrules after disassembly to ensure a reliable seal.

What is the difference between single and double ferrule compression fittings?

Single ferrule fittings use one ferrule for both gripping and sealing, while double ferrule fittings have a front ferrule for sealing and a back ferrule for gripping, offering better vibration resistance and seal integrity.

Are compression fittings suitable for high-vibration environments?

Yes, especially double ferrule designs, which provide superior resistance to vibration and thermal cycling due to their mechanical grip and seal separation.

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.

Compression Fitting