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ISO Hole Tolerances (ISO 286-2) (400mm to 3150mm):


ISO Hole Tolerances for chart given below shows range between 400mm to 3150mm. Nominal Dimension and Tolerance Zone for Holes are in mm (Metric). ISO Hole Tolerances help the manufacturer to machine the parts with specified limits given by engineer. ISO Hole Tolerance limits is designated with Capital Letter as shown in the chart and It is also described in previous pages.


Example: Nominal Size 400mm-500mm; 175μm= 175x(10-3)=0.175mm


Grade NOMINAL HOLE SIZES (mm)
Over4005006308001000 1250160020002500
Up To
And Incl.		50063080010001250 1600200025003150
E6+175
+135		+189
+ 145		+210
+160 		+ 226
+170		+261
+195		 +298
+220		+332
+240 		+360
+260		+420
+290
E7+198
+135 		+215
+145 		+ 240
+160 		+260
+170		+300
+195		 +345
+220 		+390
+240 		+435
+260 		+500
+290
E8+ 232
+135 		+255
+145 		+285
+160		+310
+170 		+360
+195 		+415
+220 		+470
+240		+540
+260 		+620
+290
E9+290
+135		+320
+145		+360
+160		+400
+170		+455
+195		 +530
+ 220 		+ 610
+240 		+700
+260		+830
+290
E10+385
+135 		+425
+145		+480
+160 		+ 530
+ 170 		+615
+195 		+720
+220 		+840
+240 		+960
+260 		+1150
+290
F6+108
+68		+120
+76		+130
+80 		+142
+86		+164
+98 		+ 188
+110 		+212
+120 		+240
+130 		+280
+145
F7+131
+68		+146
+76		+ 160
+80 		+ 176
+86		+ 203
+98 		+ 235
+110 		+270
+120 		+305
+130 		+355
+145
F8+165
+68		+ 186
+76		+205
+80 		+ 226
+86		+263
+98 		+305
+110 		+350
+120 		+410
+130 		+475
+145
G6+60
+20		+66
+22		+74
+24		+82
+26		+94
+28		+108
+30		 +124
+32		+144
+34		+173
+38
G7+83
+20		+92
+22		+ 104
+24		+116
+26		+133
+28		+ 155
+30		 +182
+32		+209
+34		+248
+38
G8+117
+20		+132
+22		+ 149
+24		+166
+26		+193
+28		+225
+30		 +262
+32		+314
+34		+368
+38
H6+40
0		+44
0		+50
0		+56
0		+66
0		+78
0		+92
0		 +110
0		+135
0
H7+63
0		+70
0		+ 80
0		+ 90
0		+105
0		+ 125
0		+150
0		 +175
0		+210
0
H8+97
0		+110
0		+125
0		+140
0		+165
0		+195
0		+230
0		 + 280
0		+330
0
H9+155
0		+175
0		+200
0		+230
0		+260
0		+310
0		+370
0		 + 440
0		+540
0
H10+250
0		+280
0		+320
0		+360
0		+420
0		+500
0		+600
0		 +700
0		+860
0
H11+400
0		+440
0		+500
0		+560
0		+660
0		+780
0		+920
0		 +1100
0		+1350
0
JS6+20
-20		+22
-22		+25
-25		+28
-28		+33
-33		+39
-39		+46
-46		+55
-55		+67.5
-67.5
JS7+31.5
-31.5		+35
-35		+40
-40		+45
-45		+52.5
-52.5		+62.5
-62.5		+75
-75		+87.5
-87.5		+105
-105
JS8+48.5
-48.5		+55
-55		+62.5
-62.5		+70
-70		+82.5
-82.5		+97.5
-97.5		+115
-115		+140
-140		+165
-165
K6+8
-32		+ 0
-44		+ 0
-50		+ 0
- 56		+ 0
-66		+ 0
-78		 + 0
-92		+ 0
-110		+ 0
-135
K7+18
-45		+0
-70		+ 0
-80		+ 0
-90		+ 0
-105		+ 0
-125		 + 0
-150		+ 0
-175		+ 0
-210
K8+ 29
-68		+ 0
-110		+ 0
-125		+ 0
-140		+ 0
-165		+ 0
-195		 + 0
-230		+ 0
-280		+ 0
-330
M6-10
-50		-26
-70		-30
-80		-34
-90		-40
-106		-48
-126		 -58
-150		-68
-178		-76
-211
M70
-63		-26
-96		-30
-110		-34
-124		-40
-145		-48
-173		 -58
-208		-68
-243		-76
-286
M8+ 11
-86		-26
-136		-30
-155		-34
-174		-40
-205		-48
-243		 -58
-288		-68
-348		-76
-406
N6-27
-67		-44
-88 		-50
-100 		-56
- 112 		-66
-132 		-78
-156 		-92
-184 		-110
- 220 		-135
-270
N7-17
-80		-44
-114 		-50
-130 		-56
- 146 		-66
-171 		-78
-203 		-92
-242 		-110
- 285 		-135
-345
N8-6
-103		-44
-154 		-50
-175 		-56
- 196 		-66
-231 		-78
-273 		-92
-322 		-110
-390 		-135
-465
P6-55
-95 		-78
-122 		-88
-138 		-100
-156 		-120
- 186		 -140
-218 		-170
-262 		-195
-305 		-240
-375
P7-45
-108 		-78
-148 		-88
-168 		-100
- 190		-120
-225 		-140
-265 		-170
-320 		-195
-370 		-240
-450
P8-68
-165 		-78
-188 		-88
-213 		-100
-240 		-120
- 285		 -140
-335 		-170
-400 		-195
- 475		-240
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