fyhcat mounted bearings units

Appendix Table 15 (2) Hexagon Head Bolts (abstract from JIS B 1180: 1994)
Parts class B M 16 − 64
Allowance of bolt length (9)
Unit: mm
s
e
k
φdw
Sg
d
(Reference)
b
S
Bolt length (9)
Over Incl.
−
80
90
120
180
240
300
400
80
90
120
180
240
300
400
500
Allowance
of length
±1.5
±1.7
±1.75
±2
±2.3
±2.6
±2.85
±3.15
(2) Parts class B M 16−64 Unit: mm
Nominal
size of
screw
d
Coarse screw
thread pitch
Fine thread
M 16 (M 18) M 20 (M 22) M 24 (M 27) M 30 (M 33) M 36 (M 39) M 42 (M 45) M 48 (M 52) M 56 (M 60) M 64
2 2.5 2.5 2.5 3 3 3.5 3.5 4 4 4.5 4.5 5 5 5.5 5.5 6
M 16
×1.5
−
−
M 18
×1.5
M 20
×1.5
M 20
× 2
−
M 22
×1.5
M 24
× 2
−
−
M 27
× 2
M 30
× 2
−
Bearing surface dia. dw
(min.)
22 24.85 27.7 31.35 33.25 38 42.75 46.55 51.11 55.86 59.95 64.7 69.45 74.2 78.66 83.41 88.16
Width across flats s (max.) 24 27 30 34 36 41 46 50 55 60 65 70 75 80 85 90 95
Width across corners e
(min.)
26.17 29.56 32.95 37.29 39.55 45.2 50.85 55.37 60.79 66.44 71.3 76.95 82.6 88.25 93.56 99.21 104.86
Head height k (basic) 10 11.5 12.5 14 15 17 18.7 21 22.5 25 26 28 30 33 35 38 40
Thread 9 ≤ 125 38 42 46 50 54 60 66 − − − − − − − − − −
length
125 <
b
9 ≤ 200 44 48 52 56 60 66 72 78 84 90 96 102 108 116 − − −
(reference) 200 < 9 ≤ 500 − − − 69 73 79 85 91 97 103 109 115 121 129 137 145 153
Nominal length 9 M 16 Body length 9g (max.)
65 (M 18)
70 M 20
80 (M 22) M 24
90 (M 27)
As for the bolts with nominal length within this area,
standards of continuous thread stud hexagon head bolt
100
40 M 30
(parts class A or B) should be observed.
110 As for the bolts with nominal 50 44
length within this area,
120 60 54 (M 33)
standards of (1) parts class
130 A should be observed.
64 58 52 M 36
140 74 68 62 56 (M 39)
150 84 78 72 66 60 M 42
160 116 112 108 104 100 94 88 82 76 70 64 (M 45) M 48
180 132 128 124 120 114 108 102 96 90 84 78 72 (M 52)
200 148 144 140 134 128 122 116 110 104 98 92 84 M 56
220 151 147 141 135 129 123 117 111 105 99 91 83 (M 60)
240 167 161 155 149 143 137 131 125 119 111 103 95 M 64
260 181 175 169 163 157 151 145 139 131 123 115 107
280 195 189 183 177 171 165 159 151 143 135 127
300 215 209 203 197 191 185 179 171 163 155 147
320 229 223 217 211 205 199 191 183 175 167
340 243 237 231 225 219 211 203 195 187
360 263 257 251 245 239 231 223 215 207
380 277 271 265 259 251 243 235 227
400 291 285 279 271 263 255 247
420 311 305 299 291 283 275 267
440 325 319 311 303 295 287
460 339 331 323 315 307
480 359 351 343 335 327
500 371 363 355 347
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)
−
M 33
× 2
M 36
× 3
−
−
M 39
× 3
M 42
× 3
−
−
M 45
× 3
M 48
× 3
−
−
M 52
× 4
M 56
× 4
−
−
M 60
× 4
M 64
× 4
−
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