GB/T 5310 wani nau'in bututun tukunya ne.

Kayan da aka wakilta shi shine 20g, 20mng, 25mng. Karfe ne mai matsakaicin carbon wanda ba shi da manganese sosai.

Tsawon isar da bututun tukunyar jirgi ya kasu kashi biyu: girma mai tsayi da girma biyu. Ana ƙididdige farashin naúrar kowane bututun gida bisa ga tsawon da aka ƙayyade, kuma ana ƙididdige farashin kowane bututu bisa ga ainihin nauyin.

Za a iya raba sikelin biyu zuwa nau'i uku:

Gajeren mai mulki: ana amfani da shi don gyara bututun ƙarfe na musamman mara sumul akan tallafin;

Kauri daidai da bango mai siffar bututun ƙarfe mara shinge na musamman (diamita na waje ƙasa da 32mm): ana amfani da shi don tsarin injiniya, kayan aikin hydraulic tare da daidaito mai girma da kyakkyawan ƙarewar saman bututun ƙarfe mara shinge;

Bututun ƙarfe mara tsari (diamita na waje ya fi 32mm ko diamita na ciki ƙasa da 40mm): Ana amfani da shi don sassa daban-daban na gini, kayan aiki da sassan injina.