Umkhiqizo uqukethe:isikulufu, umphetho wokugunda i-annular, umkhono we-thrust, i-gasket, nati.
Izinto zebholithi yehange:ezejwayelekile 4.9 kanye 8.8, 10.8, 12.9 ingxubevange steel kanye A4-80 insimbi engagqwali.
Ubuso bufakwe i-galvanized:
Ugqinsi lwe-galvanized coating ≥5 microns, futhi lusetshenziswa ezindaweni ezijwayelekile zasendlini nezangaphandle;
Ugqinsi lwe-galvanized coating lungaphezu kwama-microns angama-50, futhi lusetshenziswa endaweni egqwalayo;
Ukwelashwa kwendawo kungabuye kuthuthukiswe ngokuvumelana nezidingo zokunqanda ukugqwala, futhi ukwelashwa kwe-anti-corrosion kwe-sherardizing noma ngaphezulu kungenziwa;
I-A4-80 insimbi engagqwali ezosetshenziswa ezindaweni ezigqwalile.