Raws li lawv cov cwj pwm, cov txiv ntseej feem ntau yog cais raws li cov qauv xws li Tuam Tshoj National Standard (GB), German Standard (DIN), International Standard (ISO), Japanese Standard (JIS), thiab American Standards (ASTM / ANSI). Ntawm cov no, Suav, German, thiab Japanese cov qauv siv tsab ntawv "M" los qhia qhov loj me (piv txwv li, M8, M16), thaum Asmeskas thiab Askiv cov qauv siv feem ntau lossis "#" cim los qhia cov ntsiab lus (piv txwv li, # 8, # 10, 1/4, 3/8).
Common National Standards for Nuts:
GB41 Hom I Hex Txiv Ntoo - Qib C
GB6170 Hom I Hex Txiv Ntoo - Qib A & B
GB6171 Hom I Hex Txiv Ntoo - Fine Pitch - Qib A & B
GB6172 Nyias Hex Txiv Ntoo - Qib A & B - Chamfered
GB6173 Nyias Hex Txiv Ntoo - Fine Pitch - Qib A & B
GB6174 Nyias Hex Txiv Ntoo - Qib B - Tsis yog -chamfered
GB6175 Hom II Hex Txiv Ntoo - Qib A & B
GB6176 Hom II Hex Txiv Ntoo - Fine Pitch - Qib A & B
GB6177 Hex Flange Txiv ntseej - Qib A
GB55 Thick Hex Txiv Ntoo
GB56 Ntxiv -Tub Hex Txiv Ntoo
GB1229 Loj Hex Txiv Ntoo (High-Lub zog, rau cov qauv hlau)