INDUSTRY COMPONENT

Compression Fitting

A mechanical fitting that creates a leak-proof seal by compressing a ferrule onto tubing when tightened.

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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.

compression fitting tube fitting ferrule fitting leak-proof connection fluid coupling gas fitting industrial tubing precision assembly Compression Fitting in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

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Temperature measurement probe for chemical reactor vessels

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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

Buyer Feedback

★★★★☆ 4.6 / 5.0 (32 reviews)

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"The technical documentation for this Compression Fitting is very thorough, especially regarding technical reliability."

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

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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.

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