Editorial Technical Reference

Compression Fitting

This page explains how Compression Fitting is classified within Chemical Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

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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Compression Fitting in a manufacturing environment — Representative product image. Confirm appearance and specifications with the manufacturer.

Product Specifications

Technical details and manufacturing context for Compression Fitting

Definition

In the context of a Chemical Reactor Temperature Sensor Probe, the compression fitting serves as the critical connection point that securely attaches the temperature sensor's probe or thermowell to the reactor piping or vessel wall, ensuring a pressure-tight and leak-proof seal to prevent process fluid escape and maintain measurement integrity in harsh chemical environments. The fitting consists of a body, a nut, and one or two ferrules (sleeves). When the nut is tightened onto the fitting body, it forces the ferrule(s) to compress radially onto the inserted tube or probe stem. This compression creates both a mechanical grip (preventing pull-out) and a metal-to-metal seal (preventing leaks) by deforming the ferrule against both the tube and the fitting body. The fitting is typically made of stainless steel (e.g., 316/316L) to withstand corrosive chemicals and high temperatures. The primary specification is the tube or probe stem outer diameter (OD) in millimeters, which must match the fitting size. No specific standards are listed for this product; therefore, users must verify applicable standards and certifications with the manufacturer or supplier. For selection, confirm the OD of the probe or thermowell, the material compatibility with the process fluid, and the pressure and temperature ratings of the fitting. During installation, ensure proper tightening torque to achieve the required seal without over-compression. Regular inspection for signs of leakage, corrosion, or loosening is recommended. If leakage occurs, check the ferrule condition and re-tighten or replace as necessary. Always consult the manufacturer's documentation for model-specific values and installation guidelines.

Working Principle

The fitting consists of a body, a nut, and one or two ferrules (sleeves). When the nut is tightened onto the fitting body, it forces the ferrule(s) to compress radially onto the inserted tube or probe stem. This compression creates both a mechanical grip (preventing pull-out) and a metal-to-metal seal (preventing leaks) by deforming the ferrule against both the tube and the fitting body.

Common Materials

Stainless Steel (e.g., 316/316L)

Technical Parameters

What to specify in your RFQ

Tube or probe stem outer diameter (OD) that the fitting is designed to connect. in mm

These are the quantities to specify to the manufacturer when sizing or requesting a quote. The manufacturer's own documentation governs the exact figures and applicable standard.

Components / BOM

Fitting Body Part
Main structural component with internal taper that receives the tube and ferrule, forming one side of the seal.
Compression Nut Part
Threads onto the body to apply axial force, driving the ferrule forward to create compression and seal.
Front Ferrule Part
Primary sealing element. Compresses onto the tube and bites slightly into it, creating the main leak-tight seal.
Back Ferrule (if dual ferrule design) Part
Provides a gripping action on the tube to prevent vibration-induced loosening and supports the front ferrule.

Manufacturers of Compression Fitting

Manufacturer profiles associated with Compression Fitting.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review · Page last updated 6 September 2026

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Frequently Asked Questions

What is the primary function of a compression fitting in a chemical reactor temperature sensor probe?

It securely attaches the temperature sensor probe or thermowell to the reactor piping or vessel wall, creating a pressure-tight and leak-proof seal to prevent process fluid escape and maintain measurement integrity.

What materials are commonly used for compression fittings?

The material on file is stainless steel, such as 316/316L, which offers corrosion resistance in harsh chemical environments. Always verify material compatibility with your specific process.

How do I select the correct compression fitting size?

The key parameter is the tube or probe stem outer diameter (OD) in millimeters. Measure the OD of your probe or thermowell and select a fitting that matches. Confirm pressure and temperature ratings with the manufacturer.

What should I do if a compression fitting leaks?

First, check that the nut is properly tightened. If leakage persists, inspect the ferrule for damage or deformation. Replace the ferrule if necessary. Always follow the manufacturer's installation instructions and verify model-specific torque values.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Up to 10,000 psi (690 bar) depending on size and material
other spec:	Flow rate: Varies with tube ID and system design; Slurry concentration: Limited to low-particulate applications (<5% solids by volume)
temperature:	-65°F to 400°F (-54°C to 204°C) typical for standard materials

Compression Fitting

Product Specifications

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Compliance & Manufacturing Standards