Wire Thread Insert Installation Instructions Step 1: Drill the hole Select proper drill size from the hole drilling specification chart in the table on page 10. Drill the hole deep enough to allow clearance for installing the insert ¾ - 1½ thread pitches below the work surface.
Step 2: Add a countersink Before tapping the hole, it is good practice to countersink the hole to the dimension given in the table on page 10. Using a 120° (+/- 5°) countersink angle allows for the smoothest and most rapid production installation of the inserts because it matches the angle of the tapped thread, the insert’s outer diameter angle, and the inserting tool prewinder tip.
Step 3: Tap the hole Select the proper STI plug or bottoming tap. The STI tap generates the proper size hole to accommodate the insert. The pitch diameter limits in Table II to conform to NASM33537 specifications and must be met to assure proper post-installation thread fit.
Step 4: Install the insert Tanged: Select the appropriate inserting stem. Slide the insert on to the key so that the tang of the insert engages in the driving slot at the forward end. Wind the insert into the tapped hole until the top coil is at least three quarters (3/4) of a coil below the top of the tapped hole – make sure to avoid putting any downward load on the tang during installation. Note: When ordering stems for these sizes, the length of the insert should be specified. Drive Notch®: The locking feature in Spiralock Drive Notch (DN) inserts requires proper orientation when installing. The Drive Notch installation tools work by hooking into the notch and pulling the insert forward into the STI tapped hole. Drive Notch inserts are supplied pre-oriented on a plastic strip to save time during assembly.
Step 5: Break off tang (tanged inserts only) For insert sizes up to M6 or ¼ inch use the punch provided to remove the tang. Locate punch on tang and give a sharp downward blow with a light hammer. For insert sizes above M6 or ¼ inch, the insert key may be used to remove the tang. Start by lifting the key off the tang and turning the stem so that it will not engage the tang. Strike the key with a light hammer to break off the tang. Do not attempt to twist the tang off in any manner with the key.
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