oh1 と ol１とは？エンドミルの刃径公差とは？ | オーエスジー

In OSG end mills, the symbols "OH~" and "OL~" indicate the blade diameter tolerance.

* The ~ part of "OH~" and "OL~" contains a number to indicate the default tolerance.

OH1・・・0 ~ +0.02

OL1 ・・・-0.02 ~ 0

OL2 ・・・-0.04 ~ -0.02

OL3 ・・・-0.06 ~ -0.04

As an example, in the end mill called EKD, an end mill for two-blade keyways,

In EKD φ6 OH1, it means that the blade diameter is between 6.00~6.02.

In EKD φ6 OL1, it means that the blade diameter is between 5.98~6.00.

This blade diameter tolerance is selected according to the drawing accuracy required by the machining user.