fyhcat mounted bearings units

Appendix Table
Appendix Table 15 (1) Hexagon Head Bolts (abstract from JIS B 1180: 1994)
Parts class A M 1.6 − 24
Allowance of bolt length (9)
Unit: mm
s
e
k
φdw
Sg
d
(Reference)
b
S
Bolt length (9)
Over Incl.
−
20
30
50
80
120
20
30
50
80
120
150
Allowance
of length
±0.35
±0.42
±0.5
±0.6
±0.7
±0.8
(1) Parts class A M 1.6−24 Unit: mm
Nominal
size of
screw
d
Coarse screw
thread pitch
Fine thread
M 1.6 M 2 M 2.5 M 3 (M 3.5) M 4 M 5 M 6 M 8 M 10 M 12 (M 14) M 16 (M 18) M 20 (M 22) M 24
0.35 0.4 0.45 0.5 0.6 0.7 0.8 1 1.25 1.5 1.75 2 2 2.5 2.5 2.5 3
− − − − − − − −
− − − − − − − − −
Bearing surface dia. dw
(min.)
2.27 3.07 4.07 4.57 5.07 5.88 6.88 8.88 11.63 14.63 16.63 19.64 22.49 25.34 28.19 31.71 33.61
Width across flats s (max.) 3.2 4 5 5.5 6 7 8 10 13 16 18 21 24 27 30 34 36
Width across corners e
(min.)
3.41 4.32 5.45 6.01 6.58 7.66 8.79 11.05 14.38 17.77 20.03 23.36 26.75 30.14 33.53 37.72 39.98
Head height k (basic) 1.1 1.4 1.7 2 2.4 2.8 3.5 4 5.3 6.4 7.5 8.8 10 11.5 12.5 14 15
Thread
length
9 ≤ 125 9 10 11 12 13 14 16 18 22 26 30 34 38 42 46 50 54
b
(reference) 125 < 9 ≤ 150 − − − − − − − − − − − 40 44 48 52 56 60
M 8
×1
M 10
× 1
M 10
× 1.25
M 12
×1.5
M 12
× 1.25
−
M 14
×1.5
M 16
×1.5
−
−
M 18
×1.5
M 20
×1.5
M 20
× 2
−
M 22
×1.5
M 24
× 2
−
Nominal length 9 M 1.6 Body length 9g (max.)
12 3 M 2 M 2.5
16 7 6 5 M 3 (M 3.5)
As for the bolts with nominal length within this area,
standards of continuous thread stud hexagon head
bolt (parts class A) should be observed.
20 10 9 8 7 M 4 M 5
25 14 13 12 11 9 M 6
30 18 17 16 14 12
35 22 21 19 17 M 8
40 26 24 22 18 M 10
45 29 27 23 19 M 12
50 34 32 28 24 20
55 37 33 29 25 (M 14)
60 42 38 34 30 26 M 16
65 43 39 35 31 27 (M 18)
70 48 44 40 36 32 28 M 20
80 58 54 50 46 42 38 34 (M 22) M 24
90 64 60 56 52 48 44 40 36
100 74 70 66 62 58 54 50 46
110 80 76 72 68 64 60 56
120 90 86 82 78 74 70 66
130 90 86 82 78 74 70
140 100 96 92 88 84 80
150 106 102 98 94 90
Remarks 1. Priority is given to the nominal sizes of screws without parentheses.
2. Nominal lengths (9) to be recommended for the nominal sizes of screw are within the range enclosed by bold lines.
3. Body length 9g (maximum) should be found by the following formula :9g (maximum) = Nominal length (9) − Thread length (b)
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