Fitting Body: Tube Sizes 1/8" to 2" (3mm to 50mm)

Component Specifications

Definition

The fitting body is the main structural component of a compression fitting, designed to securely join tubing or pipes in fluid and pneumatic systems. It provides a leak-proof connection by compressing a ferrule against the tubing when tightened, creating a permanent mechanical seal without requiring welding or threading.

Working Principle

The fitting body works by housing a ferrule and nut assembly. When the nut is tightened onto the body, it forces the ferrule to compress radially onto the tubing, creating a tight seal between the tubing outer surface and the fitting body's internal taper. This compression creates both a mechanical grip and a fluid seal.

Materials

Typically made from brass, stainless steel (304/316), carbon steel, or plastic (PTFE, nylon). Material selection depends on application requirements including pressure, temperature, and fluid compatibility.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Tube Sizes	1/8" to 2" (3mm to 50mm)
Thread Types	NPT, BSPP, BSPT, SAE
Surface Finish	Ra 32 µin (0.8 µm) or better
Pressure Rating	Up to 10,000 psi (690 bar)
Temperature Range	-65°F to 450°F (-54°C to 232°C)

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

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

Over-tightening can damage tubing
Improper tube preparation causes leaks
Material incompatibility with fluids
Vibration-induced loosening

FMEA Triads

Trigger: Improper installation torque
Failure: Leakage or tubing damage
Mitigation: Use torque wrenches and follow manufacturer specifications

Trigger: Vibration in system
Failure: Connection loosening over time
Mitigation: Use vibration-resistant designs with locking features

Trigger: Material fatigue
Failure: Cracking or fracture under cyclic loading
Mitigation: Regular inspection and replacement schedules

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.005 inches (±0.127mm) on critical dimensions

Test Method

Pressure testing per ISO 19879, helium leak testing, torque-to-failure testing

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 Fitting Body

Manufacturer profiles associated with Fitting Body.

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Frequently Asked Questions

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

Single ferrule fittings use one ferrule that both seals and grips the tubing. Double ferrule fittings use two ferrules - the front ferrule creates the seal while the back ferrule provides the grip, offering better vibration resistance and reusability.

Can compression fitting bodies be reused?

The fitting body itself can typically be reused if undamaged, but ferrules should be replaced with each installation as they deform during compression to create the seal.

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.

Fitting Body