Ham-let 3500018 Compression Tube Back Ferrule 8mm

Product Description

The HAM-LET 3500018 is a compression tube back ferrule designed for use in instrumentation and fluid control tubing systems. The back ferrule works in tandem with a front ferrule and compression fitting body to create a leak-tight mechanical seal on the tube. When the fitting nut is tightened, the back ferrule drives the front ferrule into the tube, locking the assembly in place. Constructed from stainless steel, this ferrule is suitable for applications requiring corrosion resistance and pressure integrity. It is sized for 8mm tube outside diameter and sold as a single piece.

This back ferrule is used in industrial instrumentation, process piping, and analytical systems where compression-style tube fittings are specified. Typical install scenarios include connecting tubing runs in gas distribution panels, hydraulic test lines, chemical feed systems, and HVAC controls with copper or stainless tubing. It is sized to match the Swagelok part number SS-8M4-1 and fits standard 8mm OD metric tubing compression fitting assemblies.

Key Features

• Stainless steel construction for corrosion resistance in demanding fluid and gas service
• Designed for 8mm tube outside diameter compression fitting systems
• Compatible reference: Swagelok part number SS-8M4-1
• Back ferrule geometry drives sealing action of the front ferrule during makeup
• Single-piece packaging for replacement and maintenance use

Compatibility

Sized for 8mm OD tube compression fittings. Cross-references Swagelok part number SS-8M4-1. Designed as an OEM-style replacement back ferrule for standard metric compression tube fitting assemblies.

Installation Notes

Installation is performed by licensed pipefitters, instrumentation technicians, or plumbers working with compression tube assemblies. Depressurize and isolate the tubing system fully before disassembling any fitting. The back ferrule must be seated correctly behind the front ferrule in the fitting body before the nut is tightened. Follow the fitting manufacturer's specified makeup procedure, typically finger-tight plus a defined number of turns, to avoid over-compression or tube deformation.