![]() ![]() ![]() ![]() Break off the driving tang with the tang. Install outer insert with the tool furnished in the kit 1/4 to 1/2 pitch below the top surface. Tap the hole to the original depth using the special bottoming tap. H is equal to insert nominal length +1 Pitch. Heli-Coil drilling data - inch INCH - DRILLED HOLE DIMENSIONS Nominal Suggested Drill Size Thread size Aluminum Steel,Magnesium,Plastic UNIFIED COARSE 1 (. Assortments include various sizes of helical inserts and a tap, a drill bit, and an installation tool for each thread size. Drill hole to the minor diameter specified in Table 5 or 6 using the drill size specified. Insert, Corrosion-Resistant Helical Coil Fine Thread (Inch Series) NASM21209. Insert, Corrosion-Resistant Helical Coil Coarse Thread (Inch Series) NASM124651 through NASM124850. All have a prong for ease of installation. Also known as Heli-Coil inserts, the inserts have coils that expand once installed to securely anchor the insert. The helicoil insert is then threaded into the hole using a special tool. Once the threads are cleaned, a special helicoil tap is used to create a larger hole to accommodate the helicoil insert. This can typically be done with a tap or thread chaser. Shown below (Dimension H) are the MINIMUM for countersunk holes and insert set-down of 1-1/2 Insert Size: Drill Size: Screw Thread Insert Length: 1D: 1.5D: 2D: 2.5D: 3D: M2 x 0.4: 2.10: 2.00: 3.00: 4.00: 5.00: 6.00: M2.2 x 0.45: 2.30: 2.20: 3.30: 4.40: 5.50: 6.60: M2.5 x 0.45: 2.60: 2.50: 3.75: 5.00: 6.25: 7.50: M3 x 0.5: 3.10: 3.00: 4.50: 6.00: 7.50: 9. Heli-Coil ® inserts and tooling comply with the following industry standards and specifications. Assortments include various sizes of helical inserts and a tap, a drill bit, and an installation tool for each thread size. To install a helicoil, first, the damaged threads need to be removed or cleaned out. ![]()
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