Introduction

Ferrules are essential components in low-pressure fluid handling systems, creating a seal between the tubing and fitting body. While overall ferrule size, material, and compatibility are important, one of the most critical dimensions is the bore diameter, sometimes referred to as the ferrule internal diameter (ID).

The bore dimension must closely match the tubing outer diameter to ensure proper sealing, secure retention, and reliable fluid transfer.

Why Ferrule Bore Size Matters

The ferrule bore serves as the passage through which the tubing is inserted.

If the bore is too large:

• Tubing may not seal properly
• Leaks may occur
• Tubing may move during operation
• Connection reliability may decrease

If the bore is too small:

• Tubing insertion may be difficult
• Ferrule damage may occur
• Improper seating may result
• Connection performance may be compromised

For these reasons, ferrule bore dimensions are manufactured within defined tolerances.

Ferrule Bore Specification

For the following ferrules:

• 45216-F-ETFE
• 45216-F-PTFE

the bore specification is:  Internal Diameter (ID): 1.70 ± 0.05 mm

This bore size is designed to provide proper engagement with compatible tubing used in low-pressure laboratory applications.

Compatible Tubing Size

These ferrules are designed for use with:  1/16 inch OD Low Pressure Tubing

Proper matching of tubing and ferrule dimensions helps provide:

• Reliable sealing
• Consistent fluid transfer
• Reduced risk of leakage
• Secure tubing retention
• Improved system reliability

Ferrule Materials

These ferrules are available in: 

ETFE (Ethylene Tetrafluoroethylene) offers:

• Good chemical resistance
• Mechanical strength
• Durability in laboratory environments

PTFE (Polytetrafluoroethylene) provides:

• Broad chemical compatibility
• Low friction characteristics
• Excellent resistance to many laboratory solvents

Material selection should be based on the intended application and solvent system.

Typical Applications

Low-pressure ferrules are commonly used in:

• Solvent delivery systems
• Mobile phase reservoirs
• Fluid transfer assemblies
• Laboratory tubing connections
• Sample handling systems
• Chromatography support equipment

Selecting the correct ferrule dimensions helps maintain leak-free operation and reliable fluid-path performance.

Product Information

• View ETFE Ferrule Specifications and Ordering Information
• View PTFE Ferrule Specifications and Ordering Information

Conclusion

The bore diameter is one of the most important dimensions of a low-pressure ferrule because it directly affects tubing fit and sealing performance. For ferrules 45216-F-ETFE and 45216-F-PTFE, the specified bore size is 1.70 ± 0.05 mm, making them suitable for use with 1/16 inch OD low-pressure tubing in laboratory and chromatography applications.