SO6621-3 na-ekewa ihe mgbanaka piston n'ime usoro isii: igwe nkedo isi awọ, ihe nkedo agba ntụ a na-ekpo ọkụ, ígwè nkedo carbide, ígwè nkedo na-adịghị mma, ígwè nkedo ductile, na ígwè. Na 2012 Federal-Mogul mepụtara usoro nke asaa nke ihe mgbanaka piston, GOE70. Ngwa ahụ na-eji usoro matrix martensite na chromium carbide agbakwunyere, nke na-eguzogide ịgbagọ.

Ngwa na nọmba serial a na-ejikarị na ụlọ ọrụ anyị:
Nọmba ihe: H9 (GOE13)
Nọmba ihe: H6 (GOE32 F14)
Nọmba ihe: H11 (GOE52 KV1)
Ihe onwunwe nọmba: H11A (PVD piston mgbanaka ntọala ihe)
Nọmba ihe: H12 (GOE56 KV4)
Nọmba ihe: H17 (GOE65C SMX70 ASL813)
Nọmba ihe: H18 (GOE66 SMX90 ASL817)