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Foster Products

ZSi Products


FF Series, Flush Face
Sizes and Pricing

FF Plug, Female Thread
Sizes and Pricing

FF Socket, Female Thread

The FF Series couplers are a two-way shut-off hydraulic coupler. Typical applications include portable hydraulic tools, railway and construction maintenance equipment, utility company field equipment and general purpose hydraulic service. The flush face technology provides for ease of cleaning, minimal air inclusion and minimal fluid loss. The arrow stamped on the coupler indicates the direction of flow for installation purposes.


  • Meets dimensional and performance standards of ISO 16028 as well as HTMA [Hydraulic Tool Mfg. Assoc. and National Fluid Power Assoc.] and NFPA.

  • "FF" Series style double shut-off hydraulic couplings are intended for use on medium pressure hydraulic systems up to 2500 psi operating pressures.

  • Combines dual flush face valving, push-to-connect operation, minimum fluid loss upon disconnect, low air inclusion and sleeve lock.

  • Primary applications are with hydraulic tools where cleaner automatic connections are needed and in machine tool line connections where minimum fluid leaks can be tolerated.

Specifications Size
1/4" 3/8" 1/2" 3/4" 1"
Rated Pressure (psi) 5,000 5,000 5,000 5,000 5,000
Min. Burst pressure,
Male half (psi)
27,000 22,000 24,000 23,000 21,000
Min. Burst pressure,
Female half (psi)
27,000 25,000 23,000 20,000 20,000
Min. Burst pressure,
Coupled (psi)
27,000 23,000 25,000 22,000 22,000
Rated Flow (gpm) 3 6 12 26 50
Temperature Range -10°F to +250° F
Spillage (ML)
(max. per disconnect)
.015 .015 .020 .150 .200
Air Inclusion
(max. per disconnect)
.020 .020 .070 .100 .150

Performance: FF Series (1/4"; 1/8"; 1/2"; 1")
Test Fluid: Oil-200 SUS


Flow in USGPM

Note: Foster approved components (May be imported)