CB-SP-6FN-FF Flat-Face Hydraulic Coupler
Optimized for Demanding Hydraulic Applications
The CB-SP-6FN-FF is an ISO 16028-compatible flat-face quick coupling that prioritizes mechanical performance, pressure handling, and connection security. Designed with a QPQ-treated sleeve and body options, this model delivers enhanced surface durability and resistance to corrosion, wear, and pressure fatigue — even under intensive hydraulic operation.
Its sleeve-locking design prevents accidental disconnection during vibration, movement, or manual impact — offering an added layer of operational safety in the field.
Key Technical Features
• Push-to-Connect Operation
Fast, efficient coupling — connect by simply pushing without tools.
• Sleeve Locking Device
Safety lock engages automatically upon full connection, reducing risks of separation during operation.
• QPQ Surface Treatment (Optional)
Enhances steel hardness, wear resistance, and corrosion protection, especially valuable for demanding outdoor or industrial environments.
• Outstanding Flow and Pressure Performance
Withstands up to 5075 PSI, with rated flow from 12 to 155 l/min, suitable for heavy-duty hydraulic circuits.
• Minimal Spillage
Maintains clean operation with extremely low fluid loss per disconnect:0.008 ml to 0.03 ml, depending on size
Material and Construction Details
| Component | Material / Finish |
| Body | Zinc-plated steel with bichromate or QPQ |
| Sleeve | QPQ-finished steel |
| Valves | Steel, black finish |
| End Connections | Zinc-plated steel |
| Springs & Balls | AISI 302 stainless steel |
| Seals | Nitrile (NBR) |
| Dust Caps / Plugs | Red PVC (other options available) |
Note: QPQ (Quench-Polish-Quench) finish offers deep surface hardening and improved corrosion resistance.
Performance Summary
| Parameter | Specification |
| Standard | ISO 16028 |
| Connection Type | Push-to-connect with locking sleeve |
| Working Pressure | Up to 350 bar / 5075 PSI |
| Rated Flow | 12 – 155 l/min |
| Temperature Range | –20°C to +100°C (–4°F to +212°F) |
| Spillage per Disconnect | 0.008 – 0.03 ml |
| Sizes Available | 1/4", 3/8", 5/8", 3/4", 1", 1-1/4" |
Application Scenarios
• Hydraulic Pump Systems
Reliable, leak-minimized connection in stationary or mobile hydraulic systems.
• Public Works Equipment
Protects against unintentional decoupling during shock or movement.
• Agriculture & Forestry Machinery
Robust sealing and locking for tractors, harvesters, and attachments.
• Railway & Steel Industry Hydraulics
Durable under repetitive actuation cycles and high-pressure lines.
Dimensional Overview
CB-SP-6FN-FF female coupler technical drawing, highlighting flat-face design and QPQ-treated sleeve
| Body Size | PARTNO. | Thread | A | B | HEX |
| 1/4" | CB-S2S-6FN | 1/4’’ | 2.32 | 1.10 | 0.87 |
| 3/8" | CB-S3S-6FN | 3/8’’ | 2.87 | 1.26 | 1.18 |
| 3/8" | CB-S3S-6FN | 1/2’’ | 2.87 | 1.26 | 1.18 |
| 1/2" | CB-S4S-6FN | 1/2’’ | 3.31 | 1.50 | 1.42 |
| 1/2" | CB-S4S-6FN | 3/4’’ | 3.31 | 1.50 | 1.42 |
| 5/8" | CB-S5S-6FN | 1/2’’ | 3.23 | 1.65 | 1.42 |
| 5/8" | CB-S5S-6FN | 3/4’’ | 3.39 | 1.65 | 1.42 |
| 3/4" | CB-S6S-6FN | 3/4’’ | 3.74 | 1.89 | 1.61 |
| 3/4" | CB-S6S-6FN | 1’’ | 3.86 | 1.89 | 1.61 |
| 1" | CB-S8S-6FN | 1-1/4’’ | 4.33 | 2.17 | 2.17 |
CB-SP-6FN-FF male flat-face quick coupling schematic with structural detail
| Body Size | PARTNO. | Thread | C | D | HEX |
| 1/4" | CB-P2S-6FN | 1/4’’ | 2.05 | 0.63 | 0.87 |
| 3/8" | CB-P3S-6FN | 3/8’’ | 2.52 | 0.78 | 1.18 |
| 3/8" | CB-P3S-6FN | 1/2’’ | 2.52 | 0.78 | 1.18 |
| 1/2" | CB-P4S-6FN | 1/2’’ | 2.91 | 0.96 | 1.42 |
| 1/2" | CB-P4S-6FN | 3/4’’ | 2.95 | 0.96 | 1.42 |
| 5/8" | CB-P5S-6FN | 1/2’’ | 2.87 | 1.06 | 1.42 |
| 5/8" | CB-P5S-6FN | 3/4’’ | 2.95 | 1.06 | 1.42 |
| 3/4" | CB-P6S-6FN | 3/4’’ | 3.39 | 1.18 | 1.61 |
| 3/4" | CB-P6S-6FN | 1’’ | 3.39 | 1.18 | 1.61 |
| 1" | CB-P8S-6FN | 1-1/4’’ | 3.54 | 1.42 | 2.17 |
Real-world product image of CB-SP-6FN-FF set, featuring push-to-connect and safety locking structure.
Frequently Asked Questions
Q: What’s the difference between CB-SP-6FN-FF and QA variants?
A: Both feature sleeve locks, but the FF version prioritizes mechanical performance, pressure tolerance, and includes optional QPQ treatment for enhanced durability.
Q: Can I use this coupler outdoors or in harsh environments?
A: Yes — the corrosion-resistant finish and locking design make it suitable for outdoor and mobile applications.
Q: Is it compatible with standard ISO 16028 equipment?
A: Fully compatible. It can connect with Hansen FF Series and equivalent ISO 16028 models.
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