Kullun hexagonalana amfani da su don haɗa sassan ƙarfe tare.Ana yawan amfani da su wajen gini, injina da aikace-aikacen kera motoci.Shugaban hex na bolt yana ba da damar sauƙaƙewa da sassautawa tare da maƙarƙashiya ko soket, yana mai da shi sanannen zaɓi don amintaccen kayan aiki masu nauyi.

Don auna gunkin awo, kuna buƙatar ƙayyade diamita, farar, da tsayi.

1. Diamita: Yi amfani da caliper don auna diamita na kusoshi.Misali, idan kullin M20 ne, diamita shine 20mm.

2. Muryar zare: Yi amfani da ma'aunin fiti don auna tazarar da ke tsakanin zaren.Wannan zai taimake ka ka ƙayyade filin zaren, wanda yake da mahimmanci don daidaita kullun zuwa daidai goro.

3. Tsawon: Yi amfani da ma'auni ko tef don auna tsawon gunkin daga ƙasan kai zuwa saman.

Ta hanyar auna waɗannan bangarorin guda uku daidai, zaku iya ganowa kuma zaɓi madaidaicin ma'auni don takamaiman aikace-aikacenku.

"TPI" yana nufin "zaren kowane inch."Ma'auni ne da ake amfani da shi don nuna adadin zaren da ke akwai a cikin kusoshi ko dunƙule inci ɗaya.TPI muhimmin ƙayyadaddun ƙayyadaddun bayanai ne don yin la'akari da lokacin daidaita kusoshi zuwa goro ko ƙayyadaddun daidaiton abubuwan da aka zana.Misali, kullin TPI 8 yana nufin cewa kullin yana da cikakkun zaren guda 8 a cikin inch ɗaya.

Don tantance ko bolt ɗin awo ne ko na sarki, zaku iya bin waɗannan jagororin gabaɗaya:

1. Tsarin aunawa: Duba alamomi akan kusoshi.Makullin awo yawanci ana yiwa alama da harafin “M” da lamba, kamar M6, M8, M10, da sauransu, wanda ke nuna diamita a cikin millimeters.Yawancin kusoshi na mulkin mallaka ana yiwa alama alama ce da ɗan guntu ko lamba sannan "UNC" (Unified National Coarse) ko "UNF" (Unified National Fine), yana nuna ma'aunin zaren.

2. Murfin zaren: Yana auna tazarar da ke tsakanin zaren.Idan ma'aunin ya kasance a cikin millimeters, yana da yuwuwar kullin awo.Idan ma'aunin yana cikin zaren kowane inch (TPI), yana da yuwuwar kullin sarki.

3. Alamar kai: Wasu bolts na iya samun alamomi a kawunansu don nuna maki ko ma'auni.Misali, ma'auni na ma'auni na iya samun alamomi kamar 8.8, 10.9, ko 12.9, yayin da kusoshi na masarauta na iya samun alamomi kamar "S" ko wasu alamomin ƙima don kusoshi.

Ta hanyar la'akari da waɗannan abubuwan, za ku iya ƙayyade ko kullin yana da awo ko na sarki.