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Trepanning is a drilling process typically used on larger diameter bars which leaves a solid core instead of boring which removes material in the form of chips. The solid core may then be used on other orders saving you money. Trepanning is a rough size process which is usually then followed by a honing process for finish, or further machining. Trepanning is a deep hole drilling process that has broad application over many industries including, Aerospace, Chemical, Oil & Gas and Industrial. 

United Performance Metals offers trepanning from 5.00" - 12.00" on center & off center up to 200" long.