• Made to an H5 Bore Tolerance! • Balanced to 10,000 RPM • Toolholder taper ground to AT3    or better – (T.I.R. 0.0001")

Why Techniks endmill holders give you the best tool life: Diagram above is for a 1/4" shank endmill holder. Every endmill holder is lab tested and delivered with a full report documenting T.I.R., bore tolerance, and taper acccuracy. All our products are backed by our 100% satisfaction guarantee! What to look for in an endmill holder.

• Widely available (fits a wide range of tool sizes)
• Accurate (when maintained to specifications)
• Good rigidity of complete tool & holder assembly
• Does not require perishable collets or nuts
  

Endmill Holder Disadvantages:

• Poor tool life because tool shank becomes offset in bore when tightening set screw (see diagram above)
  
• Poorly made endmill holders can allow T.I.R. of 0.001" – that's 7 tenths worse than precision holders!
• Must change toolholder to change to tools of different shank diameters
• End mill holders can develop bell-mouthing from tool pressure and must be replaced
  

Endmill Holder Maintenance:

• Keep bore, toolholder taper, spindle taper, and tool shanks clean. Dirt causes premature wear and poor T.I.R.
  
• Check T.I.R. of tool shank and bore periodically to insure they are concentric
• Check bore for bell-mouthing and replace toolholder if evident
  
• Examine toolholder taper for signs of fretting. Replace toolholder if excessive fretting is evident