What a Compression Sleeve Does
A compression sleeve, also called a ferrule, creates the seal between tubing and a compression fitting body in a centralized lubrication system. When the fitting nut tightens, the sleeve deforms around the tube and presses into the fitting seat to hold pressure and resist pull-out.
Bijur and Delimon are trademarks of their respective owners.
This is an aftermarket part, not manufactured, sponsored, or endorsed by Bijur Delimon.
Bijur Delimon part numbers are for cross-reference identification only.
Replacing a worn or damaged sleeve restores the joint without replacing the entire fitting assembly, provided the fitting body and nut remain serviceable. Sleeve selection depends on tube outer diameter, tube material, and the specific fitting configuration already installed.
Part Numbers and Sizes
The table below lists distributor cross-reference data for brass compression sleeves covering 3 mm through 12 mm tube outer diameters. Confirm the existing fitting assembly before ordering because these mappings are not a primary Bijur catalog table.
| Part number | Tube OD | Ferrule OD | Material |
| 25690 | 3 mm | 4.8 mm | Brass |
| 25738 | 3 mm | 4.8 mm | Brass |
| B8272C | 4 mm | 6.0 mm | Brass |
| B1061C | 4 mm | 6.0 mm | Brass |
| 22577 | 6 mm | 8.0 mm | Brass |
| B2520C | 6 mm | 8.0 mm | Brass |
| B145C | 8 mm | 10.0 mm | Brass |
| 25677 | 10 mm | 12.0 mm | Brass |
| 25515 | 12 mm | 14.0 mm | Brass |
Where two part numbers share one tube outer diameter, the difference relates to the mating fitting body or nut configuration. Always match the replacement sleeve to the existing assembly rather than selecting by tube size alone.
Single and Double Ferrule Designs
A single ferrule performs both sealing and gripping functions in one piece. It is common in many lubrication fittings and works well when installation torque is controlled and tubing is properly supported.
Double-ferrule designs use a front seal ring and a rear grip ring. Where a double-ferrule fitting is specified, the two-piece arrangement can provide better vibration resistance and pull-out resistance than a single ferrule in the same envelope.
Public sources do not document a Bijur selection rule requiring double ferrules. Choose the ferrule style that matches the fitting body already in service.
Matching Sleeve to Tube Material
Sleeve choice must match the tube material. The B1061 line is identified for metal tubing, while the B8272 line is identified for nylon tubing.
Bijur publicly identifies B8272 as a compression sleeve for 5/32 inch nylon tubing, also shown as approximately 4 mm. B1061 is publicly identified as a sleeve for metal tubing.
The 5/32 inch and 4 mm designations are related but catalog-specific. Do not assume they are interchangeable without confirming the fitting assembly and tube wall dimensions.
Installation Practice
Replace ferrules after a joint has been disassembled. A used ferrule has already deformed to the previous tube and fitting seat, so reuse can cause leaks or poor grip.
Do not assume ferrules from another manufacturer or fitting generation fit. Even visually similar sleeves can differ in taper angle, length, or bore profile.
Plastic tubing additionally requires a tubing insert for support. The insert prevents the tube wall from collapsing under ferrule compression.
Related Parts
Compression sleeves work with matching nuts, fitting bodies, and tubing. For nylon or other plastic tube runs, use tubing inserts inside the tube end before fitting assembly.
Select compatible lubrication tubing for the full line length. Review centralized lubrication systems for system-level component guidance.
For sizing help or a quote, use the quotation form.
Frequently Asked Questions
What does a compression sleeve do?
A compression sleeve deforms between the nut and fitting body to seal the tube connection. It grips the tube and holds lubrication pressure without leaking.
Which sleeve size fits my tube?
Match the sleeve to the tube outer diameter shown in the cross-reference table. Confirm the ferrule outer diameter against your existing fitting seat before ordering.
Why do two part numbers share one tube size?
The difference relates to the mating fitting body or nut configuration, not the tube diameter. Check the existing assembly to identify the correct number.
Are these sleeves available only in brass?
The cross-reference data lists brass sleeves for all sizes shown. Other materials may exist in specific Bijur catalog lines but are not covered here.
Should I use a single or double ferrule?
Use the ferrule style that matches the fitting body already installed. Where a double-ferrule fitting is specified, it may offer better vibration resistance.
Can I use a metal tube sleeve on nylon tube?
No, sleeve choice must match tube material. Use the B1061 line for metal tubing and the B8272 line for nylon tubing.
Can I reuse a compression sleeve after disassembly?
No, replace ferrules after a joint has been disassembled. A used ferrule has already deformed and may not seal reliably again.
Do plastic tubes need inserts with these sleeves?
Yes, plastic tubing requires a tubing insert for support. The insert prevents the tube wall from collapsing under ferrule compression.
Can I mix ferrules from different brands or generations?
Do not assume ferrules from another manufacturer or fitting generation fit. Differences in taper, length, or bore can cause leaks or poor grip.
How do I order or get support?
IsoHiTech Lubrication Systems, founded in 2023, engineering since 2006, builds and supports every unit. Email inquiry@isohitech.com for specifications and a quotation.
Use the quotation form to submit your part numbers and tube sizes. A support engineer will confirm cross-reference fit before you order.
