Uzi wa Parafujo d | M5 | M6 | M8 | M10 | M12 | M14 | M16 | M20 | ||||
P | Lami | Uzi mwembamba | 0.8 | 1 | 1.25 | 1.5 | 1.75 | 2 | 2 | 2.5 | ||
Uzi mwembamba-1 | / | / | 1 | 1.25 | 1.5 | 1.5 | 1.5 | 1.5 | ||||
Uzi mwembamba-2 | / | / | / | 1 | 1.25 | / | / | / | ||||
b | L≤125 | 16 | 18 | 22 | 26 | 30 | 34 | 38 | 46 | |||
125<L≤200 | / | / | 28 | 32 | 36 | 40 | 44 | 52 | ||||
L~200 | / | / | / | / | / | / | 57 | 65 | ||||
c | min | 1 | 1.1 | 1.2 | 1.5 | 1.8 | 2.1 | 2.4 | 3 | |||
da | Fomu A | max | 5.7 | 6.8 | 9.2 | 11.2 | 13.7 | 15.7 | 17.7 | 22.4 | ||
Fomu B | max | 6.2 | 7.4 | 10 | 12.6 | 15.2 | 17.7 | 20.7 | 25.7 | |||
dc | max | 11.8 | 14.2 | 18 | 22.3 | 26.6 | 30.5 | 35 | 43 | |||
ds | max | 5 | 6 | 8 | 10 | 12 | 14 | 16 | 20 | |||
min | 4.82 | 5.82 | 7.78 | 9.78 | 11.73 | 13.73 | 15.73 | 19.67 | ||||
du | max | 5.5 | 6.6 | 9 | 11 | 13.5 | 15.5 | 17.5 | 22 | |||
dw | min | 9.8 | 12.2 | 15.8 | 19.6 | 23.8 | 27.6 | 31.9 | 39.9 | |||
e | min | 8.71 | 10.95 | 14.26 | 16.5 | 17.62 | 19.86 | 23.15 | 29.87 | |||
f | max | 1.4 | 2 | 2 | 2 | 3 | 3 | 3 | 4 | |||
k | max | 5.4 | 6.6 | 8.1 | 9.2 | 11.5 | 12.8 | 14.4 | 17.1 | |||
k1 | min | 2 | 2.5 | 3.2 | 3.6 | 4.6 | 5.1 | 5.8 | 6.8 | |||
r1 | min | 0.25 | 0.4 | 0.4 | 0.4 | 0.6 | 0.6 | 0.6 | 0.8 | |||
r2 | max | 0.3 | 0.4 | 0.5 | 0.6 | 0.7 | 0.9 | 1 | 1.2 | |||
r3 | min | 0.1 | 0.1 | 0.15 | 0.2 | 0.25 | 0.3 | 0.35 | 0.4 | |||
r4 | ≈ | 3 | 3.4 | 4.3 | 4.3 | 6.4 | 6.4 | 6.4 | 8.5 | |||
s | max=ukubwa wa kawaida | 8 | 10 | 13 | 15 | 16 | 18 | 21 | 27 | |||
min | 7.78 | 9.78 | 12.73 | 14.73 | 15.73 | 17.73 | 20.67 | 26.67 | ||||
t | max | 0.15 | 0.2 | 0.25 | 0.3 | 0.35 | 0.45 | 0.5 | 0.65 | |||
min | 0.05 | 0.05 | 0.1 | 0.15 | 0.15 | 0.2 | 0.25 | 0.3 |
Kwa nini ni hexagonal, si nyingine?
Watu wengi watakuwa na swali kama hilo, kwa nini bolt inapaswa kuundwa kwa sura ya hexagonal?Na si wengine?Heksagoni ni zao la maelewano kati ya urefu wa upande na pembe ya twist.
Kwa bolts yenye urefu wa upande usio wa kawaida, pande mbili za wrench hazifanani.Kwa kuongeza, katika siku za kwanza, kulikuwa na funguo za uma tu, na vichwa vingi vya wrench vilikuwa na sura ya tarumbeta, hivyo wrenches hazikufaa kwa ajili ya kuzalisha nguvu.Kwa kuongeza, pembe ya twist pia ni jambo muhimu la kuzingatia.Ikiwa ni kona nne, wrench inahitaji kugeuka digrii 90 ili kurekebisha screws, ambayo ni mbaya kwa ajili ya ufungaji katika nafasi nyembamba;Ikiwa ni octagonal au decagonal, ingawa pembe ya kusokotwa inakuwa ndogo, nguvu pia ni ndogo, na ni rahisi kuizunguka.
Kwa hiyo, sura ya hexagon ni chaguo la kawaida kwa bolts.