Gindi mai weld

(1)Gindi na waldaza a iya raba su zuwa dogon gwiwar hannu na walda da kuma gajeren gwiwar hannu na walda bisa ga radius na lanƙwasa. Radius na lanƙwasa na dogon gwiwar hannu na walda daidai yake da diamita na waje na bututun, wato, R=1.5D. Radius na lanƙwasa na gajeren gwiwar hannu na walda daidai yake da diamita na waje na bututun, wato, R=1D. A cikin dabarar, D shine diamita na gwiwar hannu na walda, kuma R shine radius na lanƙwasa. Idan babu wani bayani na musamman, ana amfani da gwiwar hannu na 1.5D gabaɗaya.
(2) Dangane da matakin matsin lamba, akwai nau'ikan kusan goma sha bakwai, waɗanda suke iri ɗaya da ma'aunin bututun Amurka, waɗanda suka haɗa da: Sch5s, Sch10s, Sch10, Sch20, Sch30, Sch40s, STD, Sch40, Sch60, Sch80s, XS; Sch80, Sch100, Sch120, Sch140, Sch160, XXS, waɗanda aka fi amfani da su sune STD da XS.
(3) Dangane da kusurwar gwiwar hannu, akwai gwiwar hannu mai digiri 45 da walda a gindi, gwiwar hannu mai digiri 90 da walda a gindi, gwiwar hannu mai digiri 180 da sauran gwiwar hannu masu kusurwoyi daban-daban.
(4) Kayan aiki sune: ƙarfe mai carbon, ƙarfe mai ƙarfe da kuma ƙarfe mai bakin ƙarfe.