Tsalwa leri ri tivisa nati ya Eaton Standard NB200 na ferrule ya le mahlweni ya NB300, swiphemu swa nkoka swa switirhisiwa swa tiphayiphi ta hayidiroliki ta American JIC 37° Triple-Lok. NB200 i nati ya hexagonal leyi threaded endzeni (UNF fine thread, carbon/stainless steel) ya ku hundziseriwa ka torque na ku khoma ti tubing. NB300 i ferrule yin’we yale mahlweni leyingana 37° cone na cutting edge, leyi fikelelaka ku pfariwa naku khoma loko yi tiyisiwile, leyingana ntshikelelo wale henhla xikan’we naku lwisana na ku rhurhumela. Yi tlhela yi katsa ku fambelanisiwa ka vukulu, ku pimanisiwa na switirhisiwa swa Metric 24° cone, na switsundzuxo swa ku hlawula/ku veka swilo swa nkoka eka switirhisiwa swa hayidiroliki, oyili & gasi, na swa le lwandle.
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