Hydraulic Flanged Tube, Pipe, and Hose Connections, 4-Screw Flange Connection Part 1: 3.5 MPa to 35 MPa (Code 61)
This SAE Standard covers general and dimensional specifications for the Code 61 metric (type 1) and inch (type 2) flanged heads, flange clamps (FC & FCM), and split flange clamps (FCS & FCSM) applicable to four-screw flange type tube, pipe, and hose connections. Also, included are the recommended port dimensions and port design considerations. Type 2 (inch) flange clamps and split flanges are not for new design.
The flange heads specified are incorporated into fittings having suitable means for attachment of tubes, pipes, or hoses to provide connection ends. These connections are intended for application in hydraulic systems, on industrial and commercial products, where it is desired to avoid the use of threaded connections.
The rated working pressure of an assembly shall not exceed the least of all the component working pressure rated values.
The following general specifications supplement the dimensional data contained in the tables with respect to all unspecified detail. Parts manufactured to this standard are interchangeable with ISO 6162-1 and connectors to either standard can be supplied.
Numerous changes have occurred in the industry since this standard was last updated. ISO 6162 was adopted and it added metric bolts. Over the years, SAE J518 has gone from hard inch to inch (metric referenced) and with this revision metric. The metric dimensions needed to be fine-tuned to eliminate conversion errors. The metric numbers in the SAE standard were reference numbers in the old document that moved the acceptance range by as much as 30% of the tolerance when compared to the inch numbers. At the same time, the standard is to be harmonized with the current ISO 6162-1 with the intent of incorporating the changes into an ISO 6162-1 proposed revision. To help eliminate confusion and improve the connection, a minimum of class 10.9 metric (SAE grade 8 or better) screws are now required. This revision corrects the numbers, corrects problems with the O-ring groove, increases the radius between the d8 and d9 flange head dimension, uses a common clearance hole for inch and metric bolts, adds burst pressure and other requirements, changes & recommends a washer, and numerous other changes from the 1993 revision. The pad spacing has also been changed to recognize that it could be a cavity as well as a raised or flat surface.
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