Boolal lix geesood ahwaxa loo isticmaalaa in la isku xidho qaybaha biraha. Waxaa caadi ahaan loo isticmaalaa dhismaha, mishiinada iyo codsiyada baabuurta. Madaxa hex ee bolt wuxuu u oggolaanayaa in si fudud loo adkeeyo oo lagu dabciyo furaha ama godka, taasoo ka dhigaysa doorasho caan ah oo lagu sugo qaybaha culus.

Si aad u cabbirto bolt mitirka, waxaad u baahan tahay inaad go'aamiso dhexroorka, garoonka, iyo dhererka.

1. Dhexroor: Isticmaal caliper si aad u cabbirto dhexroorka boolka. Tusaale ahaan, haddii ay tahay boodhka M20, dhexroorku waa 20mm.

2. Dhererka xargaha: Isticmaal cabbirka gauge si aad u cabbirto masaafada u dhaxaysa dunta. Tani waxay kaa caawin doontaa inaad go'aamiso dunta dunta, taas oo muhiim u ah is waafajinta boodhka iyo lowska saxda ah.

3. Dhererka: Isticmaal mastarad ama cabbiro cajalad si aad u cabbirto dhererka boolka laga bilaabo xagga hoose ee madaxa ilaa caarada.

Markaad si sax ah u cabbirto saddexdan dhinac, waxaad garan kartaa oo aad dooran kartaa mitirka bolt-ka saxda ah ee codsigaaga gaarka ah.

"TPI" waxay u taagan tahay "threads per inch." Waa cabbir loo isticmaalo in lagu tilmaamo tirada dunta ku jirta hal bolt ama furka hal inji. TPI waa qeexid muhiim ah in la tixgeliyo marka la isku dhejiyo boolal iyo nuts ama la go'aaminayo waafaqsanaanta qaybaha dunta leh. Tusaale ahaan, 8 TPI bolt waxay ka dhigan tahay in boolku leeyahay 8 dun oo dhamaystiran oo hal inch ah.

Si loo go'aamiyo in boolku yahay metric ama imperial, waxaad raaci kartaa tilmaamahan guud:

1. Habka cabbiraadda: Hubi calaamadaha boolalka. Boolalka mitirka waxaa badanaa lagu calaamadeeyaa xarafka "M" oo ay ku xigto lambar, sida M6, M8, M10, iwm, oo muujinaya dhexroorka millimitirka. Boolalka Imperial waxaa badanaa lagu calaamadeeyaa jajab ama nambar ay ku xigto "UNC" (Unified National Coarse) ama "UNF" (Unified National Fine), oo muujinaya heerka dunta.

2. Xargaha xargaha: Wuxuu cabbiraa masaafada u dhaxaysa dunta. Haddii cabbirku yahay milimitir, waxay u badan tahay bolt metric ah. Haddii cabbirku uu ku jiro dunta halkii inch (TPI), waxay u badan tahay inay tahay boodhka Imperial.

3. Calaamadaynta madaxa: boolalyada qaar waxa laga yaabaa in ay ku leeyihiin calaamado madaxyadooda si ay u muujiyaan darajada ama heerka ay gaadheen. Tusaale ahaan, bolts-ka metric waxay yeelan karaan calaamado sida 8.8, 10.9, ama 12.9, halka boolalka Imperial ay yeelan karaan calaamado sida "S" ama calaamado kale oo darajada dhismaha.

Markaad tixgeliso arrimahan, waxaad go'aamin kartaa in boodhku yahay metric ama Imperial.