SO6621-3 faib cov piston nplhaib cov ntaub ntawv rau hauv 6 series: grey cam khwb cia hlau, tshav kub-kho grey cam khwb cia hlau, carbide cam khwb cia hlau, malleable cam khwb cia hlau, ductile cam khwb cia hlau, thiab hlau. Nyob rau hauv 2012 Tsoom Fwv Teb Chaws-Mogul tau tsim lub xya series ntawm piston nplhaib cov ntaub ntawv, GOE70. Cov khoom siv cov qauv martensite matrix thiab embedded chromium carbide, uas yog resistant rau dabtsi yog khoov.

Cov ntaub ntawv thiab serial tooj feem ntau siv hauv peb lub tuam txhab:
Khoom siv: H9 (GOE13)
Khoom siv: H6 (GOE32 F14)
Khoom siv: H11 (GOE52 KV1)
Khoom siv: H11A (PVD piston nplhaib puag khoom)
Khoom siv: H12 (GOE56 KV4)
Khoom siv: H17 (GOE65C SMX70 ASL813)
Khoom siv: H18 (GOE66 SMX90 ASL817)