H5 bore tolerance is the best T.I.R. to extend tool life

H5 is the best endmill accuracy available
in the machine tool industry.

Techniks endmill holders are manufactured to H5 standards to provide the best tool life possible.
The chart below shows the difference between Techniks and the H7 or H8 standard of other manufacturers.

Note: H5 is 0.0002" to 0.0007" better than H7 or H8 depending upon shank size. That means you can extend tool life by 20% to 70% with Techniks!

Precision manufactured to provide the best tool life.

Shank and Bore Diameter Tolerances

Minimum Dimension	Maximum Dimension	Techniks H5	Others H7	Others H8
-	.118"	.00015"	.00039"	.00055"
.118"	.236"	.00019"	.00047"	.0007"
.236	.394"	.00023"	.00059"	.00086"
.394"	.709"	.00031"	.0007"	.001"
.709"	1.181"	.00035"	.00082"	.0012

To ensure proper fit the toolholder bore always has a positive (+) tolerance value.
The tool shank always has a negative (-) tolerance value. Example: for a .125" shank tolerance is -.00019"

For every 0.0001" improvement T.I.R. - You Gain 10% Tool Life!