GENERAL TECHNICAL INFORMATION n INSERT NOMENCLATURE ISO STANDARD INSERTS A P K T INSERT SHAPE RELIEF ANGLE TOLERANCE INSERT TYPE 1-3° 4-6° 7-9° 15-16° Allowable tolerance in mm: 20-24° 25-29° 30° 1 Inserts with ground surfaces 2 Dependant on insert size (see ISO standard 132) 13, 14° 17, 18, 19° 0° Special version (description 10-12° required) O = other angle 324