NA 121
DIN Standards Committee Tools and Clamping Devices
Standards
[Withdrawn]
ISO 3439
ISO 3439
Subland twist drills with cylindrical shanks for holes prior to tapping screw threads
Title (German)
Mehrfasen-Stufenbohrer mit Zylinderschaft, für Kernlochbohrungen
Responsible national committee
NA 121-01-01 AA - Drilling tools