2. Tighten nut finger tight. Then tighten nut with wrench an additional 3/4 or 1-1/4 turns indicated at left. Hold Parker fitting body with a second wrench to prevent body from turning. It is helpful to mark the nut to facilitate counting the number of turns.
For maximum number of remakes, mark the Parker fitting and nut before disassembly. Before retightening, make sure the assembly has been inserted into the fitting until the ferrule seats in the fitting. Retighten the nut by hand. Rotate the nut with a wrench to the original position as indicated by the previous marks lining up. (A noticeable increase in mechanical resistance will be felt indicating the ferrule is being re-sprung into sealing position.)
Only after several remakes will it become necessary to advance the nut slightly past the original position. This advance (indicated by B) need only be 10° – 20° (less than 1/3 of a hex flat).
Parker A-Lok/CPI® Tube Fitting part numbers use symbols to identify the size, style, and material. Tube and pipe thread sizes begin with a number indicating their size in sixteenths of an inch. For example, 4=4/16” or 1/4”; 16=16/16” or 1″.
NOTE: Lubrication on the nut is REQUIRED for proper assembly on all LARGER size fittings in both inch and metric sizes. This requirement applies to:
inch sizes of 20 and higher
metric sizes of 25 and higher
2. Now select the proper size inspection gauge and try to place it, as shown, between the nut and the body hex. If gauge DOES NOT FIT AT ANY POINT between them, you have correctly tightened the nut. If you can slip the gauge into the space, the fitting is not properly made up, and you must repeat the assembly procedure.
If you would like more information about Parker A-lok/ CPI Instrumentation Tube Fittings or other Parker Products please contact Forberg Scientific Inc Customer Service.
Toll Free: 855-288-5330