Carterberg CB-RK-SPM Thread-to-Connect Hydraulic Coupling
Flat-Face Valve | Residual Pressure Connect | Anti-Spill Design | Zinc Plated Steel
The Carterberg CB-RK-SPM is a thread-to-connect hydraulic quick coupling built for high-performance systems requiring clean disconnection and residual pressure compatibility. Designed with a flush-face valve structure and hardened threaded sleeve, this coupling ensures secure operation under demanding flow and impulse conditions — without the risk of fluid spillage. It is fully compatible with Stucchi VR and Voswinkel RK series, offering seamless interchangeability across various applications.
Key Features
• Flush-Face Design for No-Spill Performance
Valve interfaces seal tightly during connection and disconnection to prevent leakage or fluid loss.
• Residual Pressure Connect/Disconnect
Rated for up to 10 MPa (1450 PSI) residual pressure from either side — ideal for pressurized hydraulic systems in critical environments.
• Threaded Sleeve Locking Mechanism
Uses a steel sleeve with internal threads, providing secure mating with male thread fittings and strong resistance to vibration and separation.
• Zinc Nickel Plating for Corrosion Resistance
Advanced surface treatment ensures long-term anti-rust protection in harsh outdoor or mobile equipment settings.
• Valve Stop with Alignment Guard
Special valve stop retainer guarantees precise axial alignment and reliable sealing during use.
Technical Specifications
| Parameter | Value |
| Sizes Available | RK08, RK12, RK16, RK20, RK25 |
| Rated Pressure | 6090 PSI (420 bar) |
| Flow Rate | 6 to 76 GPM (based on size) |
| Temperature Range | -30°C to +120°C |
| Seal Material | NBR (Nitrile) |
| Standard Material | Carbon Steel, Zinc-Nickel Plated |
| Valve Type | Flat-Face, Two-Way Shut-Off |
| Connection Mechanism | Threaded Sleeve (Manual) |
| Residual Pressure Support | Up to 10 MPa (from both sides) |
Dimensional Overview
Female (Socket)
| PART NO | LS | D | HEX1 | HEX3 | A | T | H |
| CB-RK08SM-12S | 63.4 | 39 | S22 | S32 | 12 | M20*1.5 | 13.5 |
| CB-RK08SM-10L | 62.4 | 39 | S22 | S32 | 11 | M16*1.5 | 13.5 |
| CB-RK08SM-15L | 63.4 | 39 | S22 | S32 | 14 | M22*1.5 | 13.5 |
| CB-RK12SM-16S | 75.5 | 54.5 | S24 | S46 | 14 | M24*1.5 | 17.5 |
| CB-RK12SM-15L | 73.5 | 54.5 | S24 | S46 | 12 | M22*1.5 | 17.5 |
| CB-RK16SM-20S | 83 | 66 | S32 | S60 | 16 | M30*2 | 22.5 |
| CB-RK16SM-16S | 81 | 66 | S32 | S60 | 14 | M24*1.5 | 22.5 |
| CB-RK16SM-18L | 79 | 66 | S32 | S60 | 12 | M26*1.5 | 22.5 |
| CB-RK16SM-15L | 79 | 66 | S32 | S60 | 12 | M22*1.5 | 22.5 |
| CB-RK20SM-25S | 109 | 64 | S41 | S55 | 18 | M36*2 | 26 |
| CB-RK20SM-20S | 107 | 64 | S41 | S55 | 16 | M30*2 | 26 |
| CB-RK20SM-28L | 105 | 64 | S41 | S55 | 14 | M36*2 | 26 |
| CB-RK20SM-22L | 105 | 64 | S41 | S55 | 14 | M30*2 | 26 |
| CB-RK20SM-18L | 103 | 64 | S41 | S55 | 12 | M26*1.5 | 26 |
| CB-RK25SM-38S | 135 | 91.2 | S55 | S80 | 23 | M52*2 | 34.5 |
| CB-RK25SM-35L | 135 | 91.2 | S55 | S80 | 16 | M45*2 | 34.5 |
Male (Plug)
| PART NO | LP | d | HEX2 | HEX4 | HEX5 | A | T | h |
| CB-RK08PM-12S | 59 | M32*3 | S36 | S36 | S25 | 12 | M20*1.5 | 24 |
| CB-RK08PM-10L | 58 | M32*3 | S36 | S36 | S25 | 11 | M16*1.5 | 24 |
| CB-RK08PM-15L | 59 | M32*3 | S36 | S36 | S25 | 14 | M22*1.5 | 24 |
| CB-RK12PM-16S | 75.5 | M36*3 | S41 | S41 | S32 | 14 | M24*1.5 | 28.7 |
| CB-RK12PM-15L | 73.5 | M36*3 | S41 | S41 | S32 | 12 | M22*1.5 | 28.7 |
| CB-RK16PM-20S | 79.2 | M48*3 | S55 | S50 | S15 | 16 | M30*2 | 35.2 |
| CB-RK16PM-16S | 77.2 | M48*3 | S55 | S50 | S15 | 14 | M24*1.5 | 35.2 |
| CB-RK16PM-18L | 75.2 | M48*3 | S55 | S50 | S15 | 12 | M26*1.5 | 35.2 |
| CB-RK16PM-15L | 75.2 | M48*3 | S55 | S50 | S15 | 12 | M22*1.5 | 35.2 |
| CB-RK20PM-25S | 97 | M54*4 | S55 | S60 | S46 | 18 | M36*2 | 43.5 |
| CB-RK20PM-20S | 95 | M54*4 | S55 | S60 | S46 | 16 | M30*2 | 43.5 |
| CB-RK20PM-28L | 93 | M54*4 | S55 | S60 | S46 | 14 | M36*2 | 43.5 |
| CB-RK20PM-22L | 93 | M54*4 | S55 | S60 | S46 | 14 | M30*2 | 43.5 |
| CB-RK20PM-18L | 91 | M54*4 | S55 | S60 | S46 | 12 | M26*1.5 | 43.5 |
| CB-RK25PM-38S | 124.8 | M79*4 | S85 |
| S55 | 22 | M52*2 | 58 |
| CB-RK25PM-35L | 118.8 | M79*4 | S85 |
| S55 | 16 | M45*2 | 58 |
Application Scenarios
• Special-Purpose Vehicles
Such as fire engines, construction machinery, cleaning trucks, and mobile mixing equipment.
• Non-Leak Hydraulic Systems
Including any application requiring clean break couplings, spill-free fluid handling, and pressure-safe disconnection.
• Interchangeability in OEM Systems
Suitable for system upgrades or replacements with Stucchi VR / Voswinkel RK series.
Why It Matters
The CB-RK-SPM stands out in its category for combining no-spill connection, residual pressure compatibility, and robust threaded locking — all in a corrosion-resistant body. For engineers and system integrators seeking a cleaner, safer, and globally compatible solution, this Carterberg model delivers without compromise.
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