1. He roa te oranga o te mahi.He iti te waku me te roa o te ratonga, ka kitea e ia mata nga tukunga o roto, me te whakarite i te kounga me te kore e awangawanga.
2. Whakaaetanga Whakapakeke.Ko nga rauemi mata he wera wera, he korehau, he nui ake te pakeke. Te maimoatanga wera i roto i to ake wheketere hei whakarite i te pumau o nga hua.
3. Mata koi.Ko te mata o te maripi he koi, he maeneene, he koi me te roa, ka taea e nga taputapu tukatuka tika kawemai te tukatuka i nga momo hua kore-paerewa hei whakarite i te tika o nga hua.
| Kōeke | Rahi witi | Kiato (g/cm³) | Maama (HRa) | TRS (N/m㎡) | Taupānga |
| YG12X | Maorooro | 13.9-14.3 | 90.8-91.5 | 3200 | He pai mo te tukatuka kaata |
| Ahu(mm) | OD(mm) | ID(mm) | Mātotoru(mm) | Waitohu Miihini |
| Φ300*Φ112*1.2 | Φ300 | Φ112 | 1.2 | TCY |
| Φ291*Φ203*1.1 | Φ291 | Φ203 | 1.1 | FOSBER |
| Φ280*Φ202*1.4 | Φ280 | Φ202 | 1.4 | Mitsubishi |
| Φ280*Φ160*1.0 | Φ280 | Φ160 | 1 | Mitsubishi |
| Φ280*Φ168*1.4 | Φ280 | Φ168 | 1.4 | K&M |
| Φ260*Φ168.3*1.2 | Φ260 | Φ168 | 1.2 | Marquip |
| Φ260*Φ140*1.5 | Φ260 | Φ140 | 1.5 | lsowa |
| Φ265*Φ112*1.4 | Φ265 | Φ112 | 1.4 | Oranda |
| Φ260*Φ112*1.4 | Φ260 | Φ112 | 1.4 | Oranda |
| Φ260*Φ168.27*1.2 | Φ260 | Φ168.27 | 1.2 | Hooper/Haimona |
| Φ250*Φ150*0.8 | Φ250 | Φ150 | 0.8 | Pita |
| Φ244*Φ222*1.0 | Φ244 | Φ222 | 1 | Hooper |
| Φ240.18*Φ31.92*1.14 | Φ240.18 | Φ31.92 | 1.14 | BHS |
| Φ240*Φ32*1.2 | Φ240 | Φ32 | 1.2 | BHS |
| Φ240*Φ115*1.0 | Φ240 | Φ115 | 1 | Agnati |
| Φ230*Φ110*1.1 | Φ230 | Φ110 | 1.1 | FOSBER |
| Φ230*Φ135*1.1 | Φ230 | Φ135 | 1.1 | FOSBER |
| Momo mata maripi: Taha kotahi, takirua ranei e waatea ana. | ||||
| Rauemi: Tungsten Carbide, Whakaritenga ranei nga Rawa. | ||||
| Taupānga: Mo te ahumahi pepa kowakawaka, mo te tapahi tupeka, te tapahi pepa, te kiriata, te pahuka, te rapa, te pepa, te graphite me etahi atu. | ||||
| FAKATOKANGA: E waatea ana te whakaritenga mo ia tuhi a nga kaihoko, he tauira tuuturu ranei | ||||