Cov txiv ntoo, raws li cov kab tseem ceeb txuas txuas bolts thiab cov ntu sib txuas, tuaj nyob rau ntau qhov ntau thiab tsawg thiab hom. Cov txiv ntoo muaj nyob rau hauv ntau qhov ntau thiab tsawg, cov ntaub ntawv, thiab cov yam ntxwv ua tau zoo los ua kom tau cov ntawv thov sib txawv. Nkag siab ntau cov txiv ntoo tshwj xeeb pab peb xaiv cov tshuaj uas tsim nyog.
Npav Piv Txwv
Ib tug txiv ntoo hexagonal nrog xov loj d} m12, kev ua tau zoo theem 5, thiab qib C yog cim raws li: txiv ntoo GB / T41-2000 M12.
Ib tug txiv ntoo hexagonal nrog xov loj d {{m12, kev ua tau qib 8, tsis muaj qhab nia raws li: txiv ntoo gb / t6170-2000 m12.
Ib qho ntxiv, ntau yam ntawm ntau yam muaj, xws li M3, M4, M5, M1, M1, M1, M14, M1, M16, thiab M42. Nkag siab cov ncauj lus kom ntxaws thiab cov qauv rau cov txiv ntoo no pab peb paub ntau dua ntawm cov khoom sib txuas uas tau raws peb cov kev xav tau.
8.63
10.89
14.20
17.59
19.85
26.17
32.95
39.55
50.85
60.79
72.07
GB / T6170
6.01
7.66
8.79
11.05
14.38
17.77
20.03
26.75
32.95
39.55
50.85
60.79
72.02
GB / T6172.1
6.01
7.66
8. 79
11.05
14.38
17.77
20.03
26.75
32.95
39.55
50.85
60.79
72.02
SGB / T41
8101316182430364655gb / T6170
5.578101316182430364655gb / T6172.1
5.57810131618243036465565ongb / T41
1.8 2.2 2.7 3.2 4 5 6 8 10 12 15 18 21