National Pipe Thread
Both male and female have a straight thread and 30-degree seat and chamfer. The seal takes place by compression of the 30-degree seat on the chamfer. The threads hold the connection mechanically.
Joint Industry Council
The seal is made on the 37-degree flare seat. The threads hold the connection mechanically. Only connect male SAE 37 with female SAE 37.
O-Ring Boss
The seal takes place by compressing the O-Ring into the chamfer. The threads hold the connection mechanically. Only connect O-Ring boss male with O-Ring boss female.
O-Ring Face Seal
Code 61/62 Flange Fittings
The female port is an unthreaded hole surrounded with 4 bolt holes in a rectangular pattern. The male consists of a flanged
head, grooved for an O-Ring, and a flange with holes to match the port. The seal takes place on the O-Ring, which is compressed
between the flanged head and the flat surface surrounding the port. The threaded bolts hold the connection mechanically.
British Standard Pipe Parallel
British Standard Pipe Tapered
Komatsu® Flange Fitting
DIN
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