The 125 MINSTAC fitting system is used with the 0.125" (3.18 mm) O.D. Teflon® tubing and uses a 0.25-28 UNF fitting end. It replaces the 125 INSTAC fitting system. The 125 MINSTAC fittings are made compatible with 125 INSTAC components by removing the Ferrule. The MINSTAC system utilizes an internally threaded Collet sleeve that grips the outer diameter of the Teflon® tubing end, preventing cold flow. The chamfered end of the tubing is pressed against one end of the Ferrule by the Collet. The other end is pressed against the sealing surface in the boss by the Coupling Screw. 125 MINSTAC is compatible with 1/4-28 FLAT BOTTOM bosses by using a special ferrule.
125 MINSTAC Fitting Assembly
| Coupling Screw: | Valox®
Part Number TMAA620192?Z
? = Anodize Color Code: 0-Black; 1-Brown; 2-Red; 3-Orange; 4-Yellow; 5-Green; 6-Blue; 7-Violet; 8-Gray; 9-Clear |
| Collet Sleeve: | Valox®
Part Number TMCA6201920Z |
| Ferrule: | KEL-F®
Part Number TMBA6201910Z for MINSTAC Boss
Part Number TMBA6202910Z for 1/4 - 28 Flat Bottom Boss |
125 MINSTAC Fitting Assembly Tools
TTTA6200143A - Coupling Assembly Tool for use with 0.062" (1.57 mm) I.D. tubing and TMBA6201910Z or TMBA6202910Z.
TTTA6200243A Coupling Assembly Tool for use with 0.032" (0.81 mm) I.D. tubing and TMBA6201910Z.
TTTA6200343A - Coupling Assembly Tool for use with 0.062" (1.57 mm) I.D. tubing and TMBA620XXXXZ.
TTTA6202227A - Torque Wrench
TTTA6200227C - Wrench
125 MINSTAC TUBING ASSEMBLY PROCEDURE
1. Cut the tubing reasonably square to the desired length. Be careful not to pinch tubing. Pinching cutters are not recommended. The cut should be reasonably square.
2. Hold tubing with Tubing Grip (wet/dry sandpaper). Slide the center drill end of Lee Coupling Assembly Tool onto tubing.
3. Hand twist the tool clockwise to form a chamfered lip seal. The resulting chamfer should leave a 0.002" to 0.004" (0.05 mm to 0.10 mm) flat on the end of the tube.
4. Slip the Ferrule (part number TMBA6201910Z or ...2910Z) onto pin of the Coupling Assembly Tool.
5. Slide the flanged end of Collet Sleeve (part number TMCA6201920Z) over the Ferrule until it snaps in place.
6. Thread the Coupling Screw (part no. TMAA6201929Z) over the Collet Sleeve until it bottoms.
7. Thread the tool/coupling assembly counterclockwise onto the chamfered tubing using the Tubing Grip, applying slight force until resistance is felt after approximately 5 turns. The chamfer of the tubing should be mated against the Ferrule.
8. Unscrew the coupling from tool. The assembly is now ready for installation into a 125 MINSTAC boss.
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