Section 2
Installation
20425561
5-2005/Rev 0
2-12
Table 2-7
Recommended Extension Length
1/4” Tubing 1.25-1.50” (31.8-38.1 mm)
3/8” Tubing 1.25-1.50” (31.8-38.1 mm)
9/16” Tubing 1.75-2.00” (44.5-50.8 mm)
Hand Threading
1. Secure the coned tubing in a tube vise. No more than the recommended length of tubing
should extend beyond the face of the vice. See Table 2-7, Recommended Extension
Length.
2. Apply cutting oil to the end of the tube and slide the threading tool on the tubing.
3. Grip the handles of the tool firmly, apply steady pressure and turn the tool counter-
clockwise. Approximately every half turn, reverse direction to break off and remove the
chips.
Apply cutting oil frequently and liberally throughout the cutting operation. A medium
weight cutting oil with high sulfur content is recommended.
4. Continue threading until the proper thread length is reached, see Table 2-6, Column L.
Remove the tool from the end of the tubing.
NOTE
Clean the machining chips from the die and body of the tool before threading the
next tube.
Power Threading
1. Secure the coned tubing in a tube vise. No more than the recommended length of tubing
should extend beyond the face of the vice. See Table 2-7, Recommended Extension
Length.
2. Mount the threading tool in a 3/8-inch or 1/2-inch, variable speed power drill. Apply
cutting oil to the end of the tube and slide the threading tool on the tubing.
3. Make sure the drill is set to turn counter-clockwise. Apply steady pressure against the end
of the tubing while the threads are being cut.
Apply cutting oil frequently and liberally throughout the cutting operation. A medium
weight cutting oil with high sulfur content is recommended.
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