Faiga fa'apitoa ma tulaga lelei:
1. O loʻo faʻapipiʻiina le pito i luga, faʻatasi ai ma le maualuga o le susulu, foliga matagofie, ma le malosi o le faʻafefeteina (faʻagasologa togafitiga faʻapitoa e pei o le paʻepaʻe zinc paʻepaʻe, lanu zinc plating, phosphating uliuli, phosphating gray, ma le nickel plating).
2. Carburized ma ita, o le maaa o luga e maualuga, lea e mafai ona ausia pe sili atu i le tau masani.
3. Fa'atekonolosi fa'atekonolosi, la'ititi mimilo torque ma fa'atinoga loka maualuga.