INDUSTRY COMPONENT

Compression Fitting

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

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
ParameterTypical rangeNotes & selection driver
Seal TypeSingle or double ferrule
ReusabilityLimited reusability; ferrules may need replacement
Connection TypeMale/female NPT, BSPP, SAE, or straight thread
Pressure RatingUp to 10,000 psi (690 bar) for high-pressure designs
Tubing OD Range1/8" to 1" (3 mm to 25 mm)
Temperature Range-65°F to 400°F (-54°C to 204°C), varies by material

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 8434-1, DIN 2353, SAE J514

Parent Products

This component is used in the following industrial products

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

Typical Suppliers & Equivalents

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

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.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Compression Fitting

6 companies list this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

Xiamen Maxwell Automation Limited
Fujian, CN
Founded 2011
CE
Listed on the company's own website · profile compiled by CNFX from public sources
Double-Lin
Zhejiang, CN
Also makes: Check Valve, Check Valves, Ball Valve and 2 more
Listed on the company's own website · profile compiled by CNFX from public sources
Fescolo Pneumatic Co., Ltd.
Ningbo, Zhejiang, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Pace Pneumatics
Ningbo, Zhejiang, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Titan Automation
Zhejiang, CN
Listed on the company's own website · profile compiled by CNFX from public sources
VPEXCO
Zhejiang, CN
Listed on the company's own website · profile compiled by CNFX from public sources

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

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Shaft Bearing
Precision component supporting rotating shafts in vibration motors to reduce friction and maintain alignment.
Seal Groove
Precision-machined groove in aluminum bearing housings designed to accommodate sealing elements for fluid containment and contamination prevention.

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.

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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