CB-SP-6FN-PD Diagnostic Flat-Face Coupler
A Flat-Face Coupler Built for Hydraulic Diagnostics
The CB-SP-6FN-PD is a compact flat-face hydraulic quick coupler designed specifically for test points and pressure measurement ports within hydraulic systems. It adopts a dry-break structure based on the ISO 16028 standard and features reliable sealing, even under high pressure and frequent connect/disconnect cycles.
Unlike general-purpose couplers, this model is intended for precision use, where cleanliness, control, and compact flow are essential.
Key Features at a Glance
• Flat-Valve Construction
Minimizes fluid loss during disconnection—ideal for clean diagnostics or sampling.
• Automatic Valve Shutoff
When uncoupled, the internal valve closes automatically, preventing drips or backflow.
• Reliable Valve Opening Upon Coupling
Once connected, the valve opens fully within its rated range to ensure stable, uninterrupted fluid flow.
• Induction-Hardened Internal Parts
Key components are hardened for long-term durability and high-frequency operation.
• Precision Machined from Solid Bar Stock
Both male and female halves are manufactured from solid bar, not cast parts—resulting in tighter tolerances and more reliable performance.
• Secure Ball-Lock Mechanism
The coupler pair is held firmly by a rugged ball-lock system that ensures safety and repeatability.
• Interchangeable With:
• FASTER DF Series (Italy)
• PARKER PD Series (USA)
• AEROQUIP FD90 Series (USA)
Technical Specifications
| Parameter |
Value |
| Nominal Size |
1/4 inch |
| Rated Pressure |
6000 PSI |
| Rated Flow |
0.53 GPM |
| Operating Temperature Range |
–20 °C to +120 °C |
| Seal Material (Standard) |
NBR (Nitrile Rubber) |
| Valve Type |
Flat-face, dry-break |
| Connection |
Push-to-connect with auto valve actuation |
| Disconnection |
Pull-sleeve release; valve shuts automatically |
Note: This model is specifically configured for diagnostic ports, not for high-flow transfer systems.
Ideal Use Cases
• Hydraulic Pressure Monitoring Points
Easily connect gauges, sensors, or diagnostic tools without system shutdown.
• Service & Maintenance Equipment
Provides clean connection for fluid sampling or inline test kits.
• Mobile Hydraulic Equipment Checkpoints
Enables routine inspection of excavators, loaders, or utility trucks.
• Industrial Systems with Frequent Diagnostics
Clean-break design reduces fluid waste and simplifies compliance with safety standards.
Optional Configurations
| Option |
Description |
| Alternate Seal Options |
Viton (FKM) or EPDM available upon request |
| Custom Thread Types |
BSPP, NPT, or Metric as needed |
| Material Variant |
Stainless steel (custom order) |
| Dust Cap & Plug |
Available for protection when not in use |
Visuals & Dimensional Reference
| PARTNO. |
Thread |
D |
HS |
HP |
L |
LS |
LP |
| CB-S1S-13FN |
NPT1/8 |
24 |
S21 |
S19 |
78.5 |
50 |
42.8 |
| CB-S2S-13FN |
NPT1/4 |
24 |
S21 |
S19 |
78.5 |
50 |
42.8 |
FAQ
Q: Can this be used for standard tool connections?
A: No. This model is optimized for test points and diagnostic lines, not designed for high-flow applications.
Q: Does it require pressure release before disconnecting?
A: Yes. Always bleed the system before disconnecting to avoid damage or injury.
Q: Is it compatible with my existing Parker PD couplers?
A: Yes. CB-SP-6FN-FD is fully interchangeable with PD, DF, and FD90 series within the same size.
Internal Navigation
Looking for a high-flow flat-face coupler instead?
Need an overview of ISO 16028 types?
