Yetter 2940-055 Hydraulic Compressor - Manual (Page 8)

8
Hydraulic Fittings Identification Chart
-Due to common threads, mismatching can happen and could result in leaks and pressure loss
-Be sure to verify which style and use dash sizes when ordering replacement parts
-NPTF is easily recognizable and looks like regular pipe threads. It is not recommended for hydraulic systems
but does exist on some agriculture equipment
-SAE ORB is recommended by the NFPA for optimal leakage control in medium and high pressure hydraulic systems.
The male fitting has a straight thread and O-ring. The female port has a straight thread, a machined surface (minimum
spotface) and a chamfer to accept the O-ring. The seal takes place by compressing the O-ring in the chamfer. The
threads hold the connection mechanically.
-JIC 37 Degree Flare
fittings have a 37° cone seat on the female adapter and a 37° flare on the male adapter. This cone
seat and flare allows for a complete mechanical seal between the male and female fitting. Teflon tape on threads is not
required.
-ORFS (O-Ring Face Seal) adapter fittings use a straight thread and have a machined groove in the face of the male
fitting to accept the O-ring. This O-ring is compressed against the flat face of the female fitting for a leak proof
connection. ORFS are one of the newest types of hydraulic fittings.