Design of Automotive Towing DevicesGh.L. Mogan, I.D. Buzdugan — Transilvania University of Brașov
AnnexAnnex.T.05

Fits, tolerances and limit deviations (selection from ISO 286-2)

1. Tolerance zones and fits

Tolerance zones for the hole-basis system (commonly used in practice)

Hole-basis fits commonly used in practice

Clearance fits

Minimum (zero)Very smallSmallMediumLargeVery large
H6/h5 H7/h6 H8/h7H6/g5 H7/g6 H8/g7H6/f6 H7/f7 H8/f8H6/e7 H7/e8 H8/e9H7/d7 H8/d9 H8/d8H7/c8 H8/c9 H8/b9

Transition fits

Likely very small interference or large clearanceLikely small interference or small clearanceLikely large interference or small clearanceLikely large interference or very small clearance
H6/j5 H7/j6 H8/j7H6/k5 H7/k6 H8/k7H6/m5 H7/m6 H8/m7H6/n5 H7/n6 H8/n7

Interference fits

Very smallSmallMediumLargeVery large
H6/n5H6/p5 H7/p6H6/r5 H7/r6 H8/r7H6/s5 H7/s6 H8/s7H7/t6 H7/u6 H8/u7

2. Limit deviations

Limit deviations for hole tolerance zones (selection, H6…H9)

Sizes [mm]Tolerance zone and grade symbol (hole)
H6H7H8H9
Limit deviations [μm]
10–18+11+18+27+43
0000
18–30+13+21+33+52
0000
30–50+16+25+39+62
0000
50–80+19+30+46+74
0000
80–120+22+35+54+87
0000
120–180+25+40+63+100
0000
180–250+29+46+72+115
0000

Limit deviations for shaft tolerance zones (selection, d6…p6)

Sizes [mm]Tolerance zone and grade symbol (shaft)
d6e6f6g6h6j6k6m6n6p6
Limit deviations [μm]
10–18−50−32−16−60+8+12+18+23+29
−61−43−27−17−11−3+1+7+12+18
18–30−65−40−20−70+9+15+21+28+35
−78−53−33−20−13−4+2+8+15+22
30–50−80−50−25−90+11+18+25+33+42
−96−66−41−25−16−5+2+9+17+26
50–80−100−60−30−100+12+21+30+39+51
−119−79−49−29−19−7+2+11+20+32
80–120−120−72−36−120+13+25+35+45+59
−142−94−58−34−22−9+3+13+23+37
120–180−145−85−43−140+14+28+40+52+68
−170−110−68−39−25−11+3+15+27+43
180–250−170−100−50−150+16+33+46+60+79
−199−129−79−44−29−13+4+17+31+50

Limit deviations for shaft tolerance zones (selection, d7…p7)

Sizes [mm]Tolerance zone and grade symbol (shaft)
d7e7f7g7h7j7k7m7n7p7
Limit deviations [μm]
10–18−50−32−16−60+12+19+25+30+36
−68−50−34−24−18−6+1+7+12+18
18–30−65−40−20−70+13+23+29+36+43
−86−61−41−28−21−8+2+8+15+22
30–50−80−50−25−90+15+27+34+42+51
−105−75−50−34−25−10+2+9+17+26
50–80−100−60−30−100+18+32+41+50+62
−130−90−60−40−30−12+2+11+20+32
80–120−120−72−36−120+20+38+48+58+72
−155−107−71−47−35−15+3+13+23+37
120–180−145−85−43−140+22+43+55+67+83
−185−125−83−54−40−18+3+15+27+43
180–250−170−100−50−150+25+50+63+77+96
−216−146−96−61−46−21+4+17+31+50

Limit deviations for shaft tolerance zones (selection, d8…p8)

Sizes [mm]Tolerance zone and grade symbol (shaft)
d8e8f8g8h8js8k8m8n8p8
Limit deviations [μm]
10–18−50−32−16−60+13.5+27+34+39+45
−77−59−43−33−27−13.50+7+12+18
18–30−65−40−20−70+16.5+33+41+48+55
−98−73−53−40−33−16.50+8+15+22
30–50−80−50−25−90+19.5+39+48+56+65
−119−89−64−48−39−19.50+9+17+26
50–80−100−60−30−100+23+46+57+66+78
−146−106−76−56−46−230+11+20+32
80–120−120−72−36−120+27+54+67+77+91
−174−126−90−66−54−270+13+23+37
120–180−145−85−43−140+31.5+63+78+90+106
−208−148−106−77−63−31.50+15+27+43
180–250−270−100−50−150+36+72+89+103+122
−242−172−122−87−72−360+17+31+50

Limit deviations for shaft tolerance zones (selection, r6…u9)

Sizes [mm]Tolerance zone and grade symbol (shaft)
r6r7r8s6s7s8u6u7u8u9
Limit deviations [μm]
10–18+34+41+50+39+46+55+44+51+60+76
+23+23+23+28+28+28+33+33+33+33
18–24+41+49+61+48+56+68+54+62+74+93
+28+28+28+35+35+35+41+41+41+41
24–30+41+49+61+48+56+68+61+69+81+100
+28+28+28+35+35+35+48+48+48+48
30–40+50+59+73+59+68+82+76+85+99+122
+34+34+34+43+43+43+60+60+60+60
40–50+50+59+73+59+68+82+86+95+109+132
+34+34+34+43+43+43+70+70+70+70
50–65+60+71+87+72+83+99+106+117+133+161
+41+41+41+53+53+53+87+87+87+87
65–80+62+73+89+78+89+105+121+132+148+176
+43+43+43+59+59+59+102+102+102+102
80–100+73+86+105+93+106+125+146+159+178+211
+51+51+51+71+71+71+124+124+124+124
100–120+76+89+108+101+114+133+166+179+198+231
+54+54+54+79+79+79+144+144+144+144
120–140+88+103+126+117+132+155+195+210+233+270
+63+63+63+92+92+92+170+170+170+170
140–160+90+105+128+125+140+163+215+230+253+290
+65+65+65+100+100+100+190+190+190+190
160–180+93+108+131+133+148+171+235+250+273+310
+68+68+68+108+108+108+210+210+210+210
180–200+106+123+149+151+168+194+265+283+308+351
+77+77+77+122+122+122+236+236+236+236