Mitsuya Limited
600 Srinakarin Road, Suanluang Suanluang Bangkok 10250 Thailand.
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Grinding wheel's size

Standard sizes

The grinding wheel's standard sizes are indicated in the table below. The standard size A in the table complies to ISO standard size and while actual results in Japan from usage are few, it is desirable in the future to switch over to these standards. Standard size B is a value in which inches are converted into millimeters and is adopted in the current JIS.

Outside Diameter (D) Thickness (T) Hole Diameter (H) Concaved diameter (P)
A B A B A B
3 3 0.6 0.5 1.60 1.59 10
4 4 0.8 0.8   2.38 13
5 5 1.0 1.0 2.50   16
6 6 1.25     3.18 19
8 8 1.6 1.5 4.00 3.97 25
10 10 2.0 2.0   4.77 32
13 13 2.5 2.5 5.00    40
16 16 3.2 3 6.00 6.35 45
20 19 4 4 10.00 9.53 50
  22 5 5 13.00 12.70 63
25 25 6 6   15.00(1) 80
28 8 8 16.00 15.88 90
32 32 10 10 20.00 19.05 100
40 38 13 13   22.23 120
  45 16 16 25.00 25.40 125
    20 19     150
50 50   22   30.00(2) 160
63 65 25 25 32.00 31.75 190
80 75   28 40.00 38.10 205
  90 32 32   44.45 215
100 100 40 38 50.80 50.80 220
  115   45   63.50 235
125 125 50 50 76.20 76.20 250
150 150 63 65   101.60 280
  180 80 75 127.00 127.00 290
200 205   90 152.40 152.40 300
  230 100 100   177.80 310
250 255 125 125 203.20 203.20 330
  280          
300 305 160 150   228.60 350
350 355 200 205   254.00 370
  380 250 255 304.80 304.80 390
400 405 315 305   355.60 400
450 455 400 405   406.40 450
500 510 500 510 508.00 508.00 510
  560          
  585 600 610     585
600 610         630
  660          
750 760         760
900 915          
1060 1065          
1250 1250          
1500 1500          

Notes:
(1) Only applied to depressed centre grinding wheel.
(2) Only applied to cutting off grinding wheel.

Remarks:
1.Do not mix A and B
2.E and W are in accordance with the standard sizes for T.


Size restrictions
Japan's "The structural standard of grinding machine etc.," which is based on "The ordinance on safety and Hygiene of labor," restricts the maximum usable peripheral speed of the grinding wheel according to each size. Details are listed here.

Size restrictions by peripheral speed based on "The structural standard of grinding machine".
Max.use peripheral speed of grinding wheel Shape of grinding wheel Sizes (Unit:mm)
Outside Dia.(D) Thickness(T) Hole Dia.(H) Concaved Dia.(P) Thickness of part installed (E) Parallel part Dia. of part installed (J,K) Rim thickness (W)
Same as or under JIS R 6241 All Cutting off

Same as or under 1500
Same as or under 0.7D Same as or over 1.02Df+4 Sh.6,11:
Same as or over T/4

Sh.5,7,12,13:
Same as or over T/2
Same as or over Df+2R Same as or under E
Over JIS R 6241
Same as or under 2700m/min 1
3
4
5
7
8
10
20-26
Same as or under 1065 Same as or over D/75

Same as or under D*(D<=610)
Same as or under 0.6D Same as or over 1.02Df+4 Same as or over 2/3T Same as or over Df+2R
Over 2700m/min

Same as or under 4800m/min
1
3
4
5
7
8
10
20-26
27
28
Same as or under 1065 Same as or over D/50

Same as or under 305
Same as or under 0.5D Same as or over 1.02Df+4 Same as or over 2/3T Same as or over Df+2R
Over 3600m/min

Same as or under 4800m/min
1
10
27
28
Cutting off
Cutting off

Same as or under 1500

Others same as or under 760
Same as or over D/50

Same as or under 80
Same as or under 0.33D Same as or over Df+2R
Over 4800m/min

Same as or under 6000m/min
1
10
27
28
Cutting off
Cutting off

Same as or under 1500

Others same as or under 760
Same as or over D/50

Same as or under 80
Same as or under 0.2D Same as or over Df+2R

Remarks:
1.In this table, Df represents the diameter of flange and R represents the inside radius of the round end of concaved part.
2.Size not stipulated here are to be decided according to individual preference.