When I look at my clamps, there are threaded holes in them. What do the labels “P” “ADV” “RET” mean?
These threaded holes are called “ports”. They are either SAE 4 or SAE 2 depending on the device (SAE 6 on some manifolds). SAE 4 (7/16-20 straight thread O-ring port) is the most common. Some devices that have space restrictions may use the SAE 2 (5/16-24 straight thread O-ring) ports. The label “P” or “ADV” ports are normally used to clamp the part, “RET” indicates the port normally used to unclamp or retract the clamp.
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