ʻO ke kaʻina hana kūikawā a me nā pono kikoʻī:
1. Ua galvanized ka ili, me ka olinolino kiʻekiʻe, nani ka helehelena, a me ka ikaika corrosion kū'ē (koho kaʻina hana lapaʻau e like me keʻokeʻo zinc plating, kala zinc plating, eleele phosphating, hina phosphating, a me nickel plating).
2. ʻO Carburized a me ka huhū, ua kiʻekiʻe ka paʻakikī o kaʻili, hiki ke hiki aʻoi aku paha i ka waiwai maʻamau.
3. ʻenehana kiʻekiʻe, torque wili liʻiliʻi a me ka hana paʻa kiʻekiʻe.