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1/2" FHK and DS Series Sockets - Brass - Steel - Stainless Steel

FHK Series sockets incorporate valves in both socket and plug halves to prevent fluid loss when the socket is disconnected. These sockets are normally referred to as "hydraulic couplings", but they are used extensively with other media. Both socket and plug are sealed at disconnect. The FHK Series sockets are available in ROHS compliant steel and brass.

Vacuum Service: 27" Hg. maximum Rated pressures as defined by ANSI/B93.2-1986 based on 4:1 Safety Factor and non-shock service.

Interchangeability: Standard, most widely used, industrial interchange design. Within each series, only sockets and plugs of the same size will couple together. Compatible with ISO 7241-1, Series B.

Manual Operation: Socket sleeve must be manually retracted to connect and disconnect.

Seal Compound: Standard seals are Buna-N.


  • One Way Shut-Off: Add suffix VA to either socket or plug 
    catalog number for valve actuator.
  • Straight-Thru: Add suffix LV to both socket and plug catalog number for less valve.
  • BL: Locks against accidental disconnect. To connect, align ball with slot. After connection, rotate sleeve to lock. To disconnect, realign ball with slot and retract sleeve. To order, add prefix BL to socket catalog number.

Dust Caps and Plugs: When ordering the dust cap/plug body size must correspond to that of the socket or plug. 

CA Prop65 Warning

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Parts Grid
Part Number Quantity Price Box Qty Brand Thread Size Description
1 Foster 1/2" Steel
1 Foster 1/2" Steel Ball Lock
1 Foster 1/2" Steel w/Viton Seal
1 Foster 1/2" Steel w/EPDM Seal
1 Foster 7/8-14* Steel
1 Foster 7/8-14* Steel Ball Lock
1 Foster 1/2" Brass
1 Foster 1/2" Brass Ball Lock
1 Foster 1/2" Brass, w/Viton Seal
1 Foster 1/2" Brass, w/Neoprene Seal
1 Foster 1/2" Brass, w/Ethylene Propylene Seal