Ko ngā ine matua (pērā i ngā kōhao o roto me ngā waha aukati) ka whakahaeretia i runga anō i ngā whakaaenga kei runga i ngā tuhi, ko te tikanga he H7/h7, he rite rānei ki ngā hiahia o te kiritaki.
- Te honohono ≤ 0.03mm, te poutū o te mata pito ≤ 0.05mm (kua whakarerekētia kia rite ki ngā diameter rerekē)
Ko te tohatoha o ngā kōhao miro kua whakaritea kia rite ki te mea e whakaaturia ana i te tuhi, ā, ko ngā paerewa miro e tautoko ana i te UNC, UNF, M, me ētahi atu.
Ko te taratara o te mata o te flange ka whakahaerehia i roto i te Ra 3.2 ki te 6.3 µm.