JASO C610-1979 英文版 汽车轮毂螺栓 Hub Bolts for Automobiles.pdf

JAPANESE AUTOMOBILE STANDARD
JASO C610-78
Hub Bolts for Automobile
This Standard
be used in the wheel fitting methods A, B, C and D
ided for in JS D 4220-1960(hereafter referred to as bolts
Remarks Units and numerical values shown in in this Standards are based on the International System of Units($)and
are given for reference
2. Purpose of Standardization
This Standard aims to standardize bolts and to ensure their proper qualities
Kinds of bolts are classified by shape, and shall be of the 6 kinds listed in Table 1, in relation to the fitting meth
ds of disc wheels
Table
Cl
Attached F
Center rib Ist class
Attached Fig. 1
Center rib 2nd class
Attached Fig. 2
Center rib 3rd class
B
1 Fig 3
Bolts with head Ist cla
Attached Fig 4+
C
D
B
Bolts with head 2nd class
Attached Fig. 5
Bolts with head 3rd class
Attached Fig. 6
Note: The fitting methods for disc wheels are pursuant to the provisions of JIS D4220-1960. ( Refer to Reference Figures for
the relation between the bolt classification and fitting method)
4. Mechanical Properti
Mechanical properties of bolts shall be tested, as a rule, by the provision given in 11, and they shall conform with
the provisions given in Table 2
Applicable Standards &Reference Standards: Refer to page 12
C610-79
Table 2
Ist column
8.810.9
2nd column
TT
70
Tensile strength
Minimum
686)88][1079
100
[N/mm2」
( reference)[981]117
279
212
Vickers hardness
Mi
302
M
372
292
345
392
258
286
Brinell hardnes
Max
365
277
327
371
18
27
HR
Max
38
Yield point or yield strength 2)
kgf/mm? [N/mm2]
Mi
628][883](490?1[686]119321
St
tress ratlo
091
0.88
Proof load stress
(4)158.2
Extension at breaking Yo
Minimum
4
impact strength kgfm/cm2 [J/cm
Decarbonized unit
Depth of decarbonized unit and depth of non. less Non-decarbon-
decarbonized unit of screw
unit depth 2/
3H, or more (refe
to Fig.
Remark: This table of mechanical properties are based on quenching and tempering characteristics. Thus, concerning mechani-
s subjected to surface hardening heat treatment, appropriate values may be specified separately
of the parti
Note (1 The tensile strength is applied to completed products. The breakin hall occur at the screw or between the cylinde
the joint b
the rib and cylinde
(2)The value shall be according to the yield point if it is clear. If it is mot clear, it shall be according to the yield strength
(3)The stress ratio means the proof load stress/minimum yield point(or yield strength)
(4)The permanent extension against the proof load stress shall be less than 0.0125mm
Fig. Depth of Decarbonized Portion of Screw Unit
2/3 H, or more
1/10 H: or more
Completely or partially decarbonized
2)