Kai dunƙule hakowa wani inji ne tushe sashi, wanda yake a cikin babban bukatar. Yawancin lokaci, kusoshi, sukurori, rivets, da dai sauransu, don tabbatar da aminci ko gabaɗaya baya buƙatar la'akari da tasirin zafin jiki, mummunan yanayi ko wasu yanayin aiki masu haɗari. Common kayan ne carbon karfe, low gami karfe da kuma wadanda ba taferrous karafa. Amma musamman lokatai, fastener kayan bukatar saduwa da yanayi na tsanani lalata ko high ƙarfi, akwai da yawa bakin karfe da matsananci high ƙarfi bakin karfe fito. Ya kamata a kula da waɗannan matsalolin guda shida masu zuwa yayin amfani da kiyaye wayar wutsiya mai hakowa:
1. Tsarin wanke igiyar wutsiya mai hakowa yana da gaggawa kuma yana buƙatar kulawa sosai. Yayin aiwatar da aikin, za a sami raguwa a saman wayar wutsiya mai hakowa. Wannan mataki shine kurkure bayan an wanke siliki mai tsabta.
2. A lokacin aiwatar da zafin jiki, ya kamata a haɗa tari, in ba haka ba kadan oxidation zai faru a cikin quenching mai.
3. Farar fata na phosphide za su bayyana a saman screws masu ƙarfi, yana nuna (ma'ana 1) cewa dubawa ba ta da hankali sosai yayin aiki. 4. Abubuwan da ke baƙar fata a saman sassan sassa suna haifar da aikace-aikacen sinadarai, wanda ke nuna cewa ba a yi maganin zafi sosai ba kuma ba a cire ragowar alkaline a saman ba.
5. daidaitattun sassa za su yi tsatsa a cikin kurkura, kuma ruwan da ake amfani da shi don kurkura ya kamata a canza akai-akai.
6. Yawan lalata yana nuna cewa an daɗe ana amfani da man quench, kuma ana buƙatar ƙara ko maye gurbinsa.