ZCO screw fittings with O-ring face seal

The flat-sealing Hy-Lok ZCO screw fittings have no clearance in axial direction during installation and removal (Zero Clearance). They have an O-ring face seal and are designed for vacuum up to high-pressure applications at high temperatures up to 280°C (550°F).

They are easy to install and maintain, and offer bores for leak tests.

 

Body, sleeve, nuts: Stainless steel 316
Butt welding fittings: Stainless steel 316L
O-ring (standard): Viton, hardness 70 Viton,
Hardness 90 (SAE/MS thread)

 

Material Temperature
Fluorocarbon 400°F (200°C)
Buna N (BU) 250 °F (120 °C)
PTFE (PE) 450 °F (230 °C)
Perfluoroelastomer (KA) 550°F (280°C)
Ethylene propylene (EP) 300 °F (140 °C)

ZCO screw fittings

ZCOFN
Union nut, connects a ZCO sleeve to the body
ZCOBN
Blind nut, seals a ZCO body
ZCOSWG
Sleeve for socket welding
ZCOTWG
Sleeve for automatic butt welding
ZCOSWRG
Reducer sleeve for socket welding
ZCOBG
Blind socket
ZCOSWC
Body with socket welding end,
transition from pipe to ZCO sleeve
ZCOTWC
Body with automatic butt welding end,
transition from pipe to ZCO sleeve
ZCOMC
Male screw connector,
transition from NPT female thread to ZCO sleeve
ZCOSC
Male screw connector body with SAE/MS thread,
transition from SAE/MS thread to ZCO sleeve
ZCOFC
Female screw connector with inside thread,
transition from NPT male thread to ZCO sleeve
ZCOCC
Body with Hy-Lok screw fitting,
transition from pipe to ZCO sleeve
ZCOCBHC
Bulkhead connector with Hy-Lok screw fitting,
transition from pipe to ZCO sleeve
ZCOUA
Screw connector, joins ZCO sleeves
ZCOBHU
Bulkhead screw connector, joins ZCO sleeves
ZCOUR
Reducer screw connector, joins ZCO sleeves
ZCOLM
Male elbow screw connector,
transition from NPT female thread to ZCO sleeve
ZCOSL
Swivel elbow with SAE/MS thread,
transition from cylindrical SAE/MS thread to ZCO sleeve
ZCOLA
Elbow, joins ZCO sleeves
ZCOTA
T-piece, joins ZCO sleeves
ZCOP
Plug, seals a ZCO sleeve and the union nut
ZCOSMC
Male screw connector,
transition from NPT female thread to ZCO
ZCOSSC
Male screw connector with SAE/MS thread,
transition from cylindrical SAE/MS thread to ZCO
ZCOSFC
Swivel male screw connector,
transition from NPT male thread to ZCO
ZCOSUA
Swivel screw connector, joins ZCO O-rings
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ZCO assemblies are subjected to a 100% leak test with helium at a flow rate of 4 x 10-9 standard cubic metres/s and are absolutely leak-free.

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