INDUSTRY COMPONENT

Back Ferrule (if dual ferrule design)

Secondary ferrule in dual-ferrule compression fittings that creates a leak-tight seal by compressing against the tubing.

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Component Specifications

Definition
The back ferrule is the rear component in a dual-ferrule compression fitting system, typically used in industrial fluid and gas applications. When the fitting nut is tightened, it drives the front ferrule forward while compressing the back ferrule against the tubing. This creates a secondary mechanical grip and seal that prevents vibration-induced loosening and ensures long-term reliability. The back ferrule's design allows for controlled deformation that maintains seal integrity even under thermal cycling and pressure fluctuations.
Working Principle
The back ferrule operates on mechanical compression principles. When the fitting assembly is tightened, the back ferrule is compressed radially against the tubing outer diameter, creating a strong mechanical grip. Simultaneously, it pushes against the front ferrule, forcing it to bite into the tubing and form the primary seal. This dual-action provides both secure holding force and redundant sealing capability.
Materials
Typically manufactured from corrosion-resistant materials: 316 stainless steel (most common), brass, carbon steel, or specialty alloys like Monel or Hastelloy for corrosive environments. Hardness typically ranges from 80-90 HRB for optimal deformation characteristics.
Technical Parameters
  • Surface Finish 16-32 μin Ra (0.4-0.8 μm Ra)
  • Pressure Rating Up to 10,000 psi (690 bar)
  • Tubing OD Range 1/8" to 2" (3mm to 50mm)
  • Temperature Range -65°F to 450°F (-54°C to 232°C)
  • Concentricity Tolerance ±0.002" (±0.05mm)
Standards
ISO 8434-1, DIN 2353, SAE J514

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Back Ferrule (if dual ferrule design).

back ferrule compression fitting dual ferrule tube fitting hydraulic fitting pneumatic fitting fluid connection sealing component Back Ferrule (if dual ferrule design) Back Ferrule (if dual ferrule design) in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Compression Fitting

A mechanical fitting that creates a leak-tight seal by compressing a ferrule or sleeve onto a tube or pipe when tightened.

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Engineering Analysis

Risks & Mitigation
  • Improper installation causing leaks
  • Material incompatibility with fluid
  • Vibration-induced fatigue failure
  • Over-torquing leading to component damage
FMEA Triads
Trigger: Incorrect installation torque
Failure: Incomplete seal formation or tubing damage
Mitigation: Use calibrated torque wrenches and follow manufacturer specifications
Trigger: Material fatigue from cyclic loading
Failure: Crack propagation and sudden seal failure
Mitigation: Implement regular inspection schedules and use fatigue-resistant materials
Trigger: Corrosion from incompatible fluids
Failure: Gradual material degradation and leak development
Mitigation: Select appropriate material grades for specific fluid compatibility

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±0.0005" on critical dimensions, concentricity within 0.002" TIR
Test Method
Helium leak test per ASTM E493, pressure cycling test per ISO 19879, vibration test per MIL-STD-810

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

What is the difference between front and back ferrules?

The front ferrule creates the primary seal by biting into the tubing, while the back ferrule provides mechanical grip and prevents vibration loosening. Both work together for reliable connections.

Can back ferrules be reused?

No, back ferrules should not be reused. Once compressed during installation, they undergo permanent deformation. Reuse can compromise seal integrity and cause leaks.

How do I identify a worn back ferrule?

Look for excessive deformation, cracks, or galling on the contact surfaces. Also check for improper seating marks or changes in the compression ring profile.

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.

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