156 MINSTAC - Boss Preparation

156 Boss Configuration


156 MINSTAC Boss Preparation Tools

Combination Boss Drill TTTA9500227A


Plug Tap TTTA6201627A


Bottoming Tap TTTA6201727A


156 MINSTAC Boss Preparation

The following procedure should be used in preparing the boss for assembly:

Procedure:
1. Drill a 0.096" (2.44 mm) diameter pilot hole in the desired boss location.
2. Insert the pilot diameter of the Lee Combination Boss Drill part number TTTA9500227A into the pilot hole and drill down until the 0.311" (7.90 mm) diameter spotface cleans up the surface of the boss. All diameters should be concentric within 0.006" (0.15 mm) T.I.R. The sealing surface should be smooth with no burrs or tool marks.

3. Tap the 0.250-28 unfinished threads using the Lee Plug Tap part number TTTA6201627A first and the Lee Bottoming Tap part number TTTA6201727A second. These taps incorporate stops to avoid damaging the sealing surface.

Note: Care must be taken to ensure that the Taps will follow true in the hole produced by the Combination Drill.
For more information, please send us your application information via our ASK LEE service. Or contact our application engineers in the USA at 1-800-LEE-PLUG or our representatives around the world.
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