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T-Max U-Lock® is a complement to the CoroThread 266 rigid indexable insert threading system. It provides a specialized solution for 11 mm (0.433 inch) internal threading applications in three different geometries: all-round, sharp and a chip breaking C-Geometry.



  • Cost efficient solution with three cutting edges
  • Tailor Made inserts available



  • Indexable inserts
  • 11-size IC = ¼” = 6.35 mm.
  • Tailor Made inserts available
  • Three sharp cutting edges for high quality threads
  • Thread profiles for V-profile 55° and 60°
  • Three different geometries: all-round, sharp and a chip breaking



  • Internal threading
  • Minimum hole size: 12 mm (0.472 inch).
  • Insert geometries and grades for all materials apart from ISO H
  • The tool holder for inserts with size 11 is made for a 2° inclination angle and no shim


ISO appliocation area



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  • GC 1020 – Good all round PVD-coated grade suitable for ISO P, M, K, N & S materials. Good wear resistance and edge sharpness.
  • GC 4125 – Used as an optimizing PVD-coated grade for various steel threading operations.
  • Standard geometry, first choose in most operations
  • Sharp F-geometry, clean cuts in sticky or work hardening materials
  • Chip breaking geometry, for maximum chip control and minimum supervision
Tool holding 
  • Coromant Capto cutting units, size C3 and C4
  • Boring bar Ø 16 + step boring bar with reduced diameter 16 to 12 (Ø ⅝”, ⅝” reduced to ½”)
  • SL cutting heads coupling size Ø 16 and 20 mm.

Product range 

  • General usage for all segments of engineering industry
    • V-profile 60°
    • V-profile 55°
    • Metric 60°
    • Unified, UN 60°
  • Pipe fittings and couplings for gas, water and sewage
    • WhithWorth 55°
    • National Pipe Thread NPT 60

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