- High precision bore (H5) is best in industry
- Balanced to 15,000 RPM at G6.3
- Taper ground at AT3 for maximum spindle contact
All Techniks end mill holder bores are manufactured to meet or exceed the H5 specification. H5 is an extremely accurate bore I.D. and provides improved T.I.R. for extended cutting tool life.
Please specify your bore I.D. (shank size) when ordering replacement lock screws to ensure correct replacement.