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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