Skip to content
Foster 6FFSDC, 1/4" FF Plus Socket Dust Cap, FF Plus Series, PVC

Foster FF25S-16, 1" Flat Face Hydraulic Coupler x 1" Female NPT, FF Plus Series, Nickel-Plated Steel

by Foster
Save 20% Save 20%
$ 5,483.00
$ 5,483.00 - $ 5,483.00
$ 5,483.00
$ 4,387.00
$ 4,387.00 - $ 4,387.00
$ 4,387.00

Premium flat-face hydraulic connections that stay clean and lose virtually no fluid. The Foster FF25S-16 is a nickel-plated steel 1" coupler from the FF Plus Series — Foster's upgraded flat-face line built to ISO 16028, rated to 5075 PSI. The flat faces wipe clean, include almost no air on connection, and spill almost no oil on disconnect.

Specifications

  • Brand: Foster
  • Series: FF Plus (Flat Face, ISO 16028)
  • Part Number: FF25S-16
  • ISO 16028 Size: 25
  • Interchange: 1" ISO 16028 Flat Face
  • Body: 1" Coupler
  • Thread: 1" Female NPT, FPT
  • Type: Flat Face, no-spill / no air inclusion
  • Flow: Bidirectional
  • Material: Nickel-Plated Steel
  • Seal: Nitrile std (Viton available)
  • Max Working Pressure: 5075 PSI
  • Corrosion: Tested 1,200 hrs salt spray (no white/red rust)
  • Temperature: Nitrile -40 to 223F; Viton -4 to 392F
  • Standard: ISO 16028, tested to ISO 7241-2
  • Quantity: 1pc
  • Origin: Made in USA

Why this coupler

  • Flat face, no-spill design — which means virtually no fluid loss on disconnect and minimal air inclusion on connect, keeping systems clean.
  • Flat faces wipe clean — which means you can wipe both halves before connecting, critical in dirty field environments.
  • Bidirectional flow — which means oil can flow either direction through the coupling.
  • Safety locking sleeve — which means protection against accidental disconnection under load.
  • 1,200-hour salt-spray tested — which means proven corrosion resistance with no white or red rust.
  • Zinc-nickel plated carbon steel — which means a tough, corrosion-resistant body at a working-tool price point.

Frequently asked questions

What does this connect to?
It meets ISO 16028 flat face and connects with matching 1" FF Plus plugs.

What pressure is it rated for?
Rated to 5075 PSI maximum working pressure.

Why a flat/flush face?
Flat-face couplers spill almost no oil on disconnect and include almost no air on connect, and the faces wipe clean — ideal for keeping hydraulic systems contamination-free.

Pair this coupler with a matching 1" FF Plus plug for a complete connection. Ideal for portable hydraulic tools, construction and utility equipment, and field maintenance.

Why FF Plus vs standard flush face: The FF Plus line is the upgraded option — offered in both nickel-plated steel and 316 stainless, with bidirectional flow, a Connect-Under-Pressure option, and 1,200-hour salt-spray corrosion testing. It exceeds the basic flush-face spec while remaining ISO 16028 intermateable.

Why buy from hpcouplers: Foster quality, responsive US-based support, accurate specs, fast shipping.