Twinserts are used to correct STI* or standard tapped holes that are stripped, off-center, damaged or beyond the correction range of Oversize Inserts or standard Heli-Coil® Inserts. Twinsert assemblies as the name implies consist of two Heli-Coil® Inserts: an Outer Insert, always Free-Running and an Inner Insert which can be either Free-Running or Screw-Lock. When assembly is satisfactory, remove the tang with the tang break-off tool recommended for the original insert. Note – a standard gage can be used to check an installed free-running Oversize Insert assembly provided the insert is fully seated.Ĥ. If the assembly is still oversize, it will be necessary to resort to a Twinsert Repair Kit as shown on pages 6 & 7. Use the same tool recommended for a standard Heli-Coil Insert of the same size.ģ.
#Keensert tap drill chart install
Install the insert to the proper depth below the top surface (1/4 to 1/2 pitch for tapped holes without a countersink and 1 to 1-1/2 pitch for holes with a countersink). For critical applications, refer to the tapping and gaging procedure listed in the Engineering Data and Trouble Shooting section.Ģ. Retap the oversize hole with the special bot-toming tap furnished in the kit. For identification, the tang and bottom coil are dyed yellow on all Oversize Inserts. The columns on the right of Tables A & C indicate the effective correction to the pitch diameter of oversize tapped holes.Įach kit contains the quantity of 1-1/2 diameter inserts indicated in Tables A and C and a special oversize bot-toming tap. When Oversize Inserts are installed, the original internal thread size is re-established allowing installation of the original size bolt. Oversize Insert Kits and components come in inch sizes UNC and UNF, and Metric sizes as shown in the following tables. They can also be used to correct conditions of slight taper and bell-mouth in STI tapped holes. Oversize Inserts are used to correct the tapping errors that cause STI* assemblies to gage oversize. Oversize Inserts are Inserts with a larger wire cross section.
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