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?
