Low-Spill Quick Couplings
Flat Face Hydraulic Couplings
Flush-face sealing that wipes clean on every connection — for mobile equipment where spill, contamination and safety matter.
Product Overview
Flat-face (flush-face) hydraulic couplings per ISO 16028 are the standard choice for skid steer loaders, excavators, forestry and agricultural attachments. The flat sealing faces wipe clean before the valves open, keeping dirt out of the hydraulic system; the design also minimizes fluid spill and air inclusion on disconnect. We supply standard and connect-under-pressure (CUP) versions with NPT, BSPP, BSPT, JIC or ORFS end connections.
Key Features
- Flat sealing faces wipe clean before connection — contamination control
- Minimal spill and air inclusion, ideal for environmental and safety-sensitive sites
- Connect-under-pressure (CUP) variants for hot-swap of attachments
- Hardened, precision-ground faces for long seal life
- Stainless option for corrosive and washdown environments
- Interchangeable per ISO 16028 with major flat-face ranges
Applications
ISO 16028 dimensional interchange
CUP (connect-under-pressure) options
Caps & plugs stocked per size
24h response on quote requests
Flat Face vs Ball Lock: Which for Your Machine?
| Criterion | Flat Face (ISO 16028) | Ball Lock (ISO 7241) |
|---|---|---|
| Spill on disconnect | Minimal (flat faces) | Small (poppet), but face seal can drip |
| Contamination control | Excellent — faces wipe clean | Moderate |
| Connect under pressure | CUP versions available | Not standard |
| Typical cost | Higher | Lower |
| Best for | Skid steers, excavators, bio-oil systems | Machine tools, general industrial |
Specifying Flat Face — 4 Decisions
- 1Size by flow: DN 6.3–DN 25. Match the machine's auxiliary flow and hose size.
- 2CUP or standard: if operators connect hot attachments (e.g., multi-tool skid steer), choose connect-under-pressure.
- 3Threads: ORFS for high-pressure mobile, JIC for US-built, BSPP for European machines.
- 4Caps & plugs: order per coupling to protect faces between connections.
Technical Specifications
| Item | Specification |
|---|---|
| Standard | ISO 16028 (flat-face, flush-face quick couplings for hydraulic fluid power) |
| Size range | DN 6.3 (1/4") to DN 25 (1") common; larger sizes available |
| Working pressure | Typically 250–350 bar (3,600–5,000 psi) depending on size and material |
| Materials | Carbon steel with hardened flat-face surfaces; stainless steel option |
| Connection types | NPT, BSPP, BSPT, JIC, ORFS — specify both ends |
| Spill performance | Flat-face design: minimal fluid loss and low air inclusion on connect |
| Connect-under-pressure | Optional CUP (connect-under-pressure) versions for residual-pressure circuits |
| Applications | Skid steers, excavators, agriculture, forestry, demolition, snow removal |
* Specifications subject to change. Contact us for the current datasheet.
FAQ
Questions Buyers Ask
Why choose flat-face over ball-lock?
Flat-face couplings have flush sealing faces that wipe clean on connection, so dirt cannot be trapped in the seal area. They also spill far less fluid on disconnect — important on environmental sites and for expensive bio-oils.
Can flat-face connect under residual pressure?
Standard ISO 16028 couplings need depressurization. Connect-under-pressure (CUP) versions relieve trapped pressure during connection and are the safe choice for circuits that routinely connect hot.
Are flat-face couplers interchangeable across brands?
ISO 16028 defines the dimensional envelope, so major brands mate. Verify pressure rating and seal compatibility before mixing in critical circuits.
What about caps and plugs?
Caps and plugs protect the flat faces when disconnected — strongly recommended for dusty job sites. We stock them per size.
Interested in Flat Face Hydraulic Couplings?
Factory-direct pricing, OEM/ODM options and lead times — send your spec and volume, get a quote within 24 hours.