TorqueMath

ISO Fits Chart

Limit deviations for holes H7, H8, H9 and H11 and shafts c11 to s6, and the clearance or interference of ten common hole-basis fits, for every ISO 286 size range up to 500 mm.

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TorqueMath.com · ISO Fits Charttorquemath.com/iso-fits-chart/

Find the size range of your part, read the upper and the lower deviation in micrometres and add them to the nominal size. Example: a 25 mm H7 hole may measure 25.000 to 25.021 mm and a g6 shaft 24.980 to 24.993 mm, so the pair has 7 to 41 µm clearance. The third table gives that result directly for each common fit: green clearance fits always have play, red interference fits are always tight, and amber transition fits can be either.

Hole limit deviations (µm)

Hole limit deviations (µm)
Size mmH7H8H9H11
≤ 3+100+140+250+600
3–6+120+180+300+750
6–10+150+220+360+900
10–18+180+270+430+1100
18–30+210+330+520+1300
30–40+250+390+620+1600
40–50+250+390+620+1600
50–65+300+460+740+1900
65–80+300+460+740+1900
80–100+350+540+870+2200
100–120+350+540+870+2200
120–140+400+630+1000+2500
140–160+400+630+1000+2500
160–180+400+630+1000+2500
180–200+460+720+1150+2900
200–225+460+720+1150+2900
225–250+460+720+1150+2900
250–280+520+810+1300+3200
280–315+520+810+1300+3200
315–355+570+890+1400+3600
355–400+570+890+1400+3600
400–450+630+970+1550+4000
450–500+630+970+1550+4000

Shaft limit deviations (µm)

Shaft limit deviations (µm)
Size mmc11d9f7g6h6k6n6p6r6s6
≤ 3−60−120−20−45−6−16−2−80−6+60+10+4+12+6+16+10+20+14
3–6−70−145−30−60−10−22−4−120−8+9+1+16+8+20+12+23+15+27+19
6–10−80−170−40−76−13−28−5−140−9+10+1+19+10+24+15+28+19+32+23
10–18−95−205−50−93−16−34−6−170−11+12+1+23+12+29+18+34+23+39+28
18–30−110−240−65−117−20−41−7−200−13+15+2+28+15+35+22+41+28+48+35
30–40−120−280−80−142−25−50−9−250−16+18+2+33+17+42+26+50+34+59+43
40–50−130−290−80−142−25−50−9−250−16+18+2+33+17+42+26+50+34+59+43
50–65−140−330−100−174−30−60−10−290−19+21+2+39+20+51+32+60+41+72+53
65–80−150−340−100−174−30−60−10−290−19+21+2+39+20+51+32+62+43+78+59
80–100−170−390−120−207−36−71−12−340−22+25+3+45+23+59+37+73+51+93+71
100–120−180−400−120−207−36−71−12−340−22+25+3+45+23+59+37+76+54+101+79
120–140−200−450−145−245−43−83−14−390−25+28+3+52+27+68+43+88+63+117+92
140–160−210−460−145−245−43−83−14−390−25+28+3+52+27+68+43+90+65+125+100
160–180−230−480−145−245−43−83−14−390−25+28+3+52+27+68+43+93+68+133+108
180–200−240−530−170−285−50−96−15−440−29+33+4+60+31+79+50+106+77+151+122
200–225−260−550−170−285−50−96−15−440−29+33+4+60+31+79+50+109+80+159+130
225–250−280−570−170−285−50−96−15−440−29+33+4+60+31+79+50+113+84+169+140
250–280−300−620−190−320−56−108−17−490−32+36+4+66+34+88+56+126+94+190+158
280–315−330−650−190−320−56−108−17−490−32+36+4+66+34+88+56+130+98+202+170
315–355−360−720−210−350−62−119−18−540−36+40+4+73+37+98+62+144+108+226+190
355–400−400−760−210−350−62−119−18−540−36+40+4+73+37+98+62+150+114+244+208
400–450−440−840−230−385−68−131−20−600−40+45+5+80+40+108+68+166+126+272+232
450–500−480−880−230−385−68−131−20−600−40+45+5+80+40+108+68+172+132+292+252

Fits: clearance (+) and interference (−) in µm

Fits: clearance (+) and interference (−) in µm
Size mmH11/c11clearanceH9/d9clearanceH8/f7clearanceH7/g6clearanceH7/h6clearanceH7/k6transitionH7/n6transitionH7/p6interferenceH7/r6interferenceH7/s6interference
≤ 3+60 … +180+20 … +70+6 … +30+2 … +180 … +16−6 … +10−10 … +6−12 … +4−16 … 0−20 … −4
3–6+70 … +220+30 … +90+10 … +40+4 … +240 … +20−9 … +11−16 … +4−20 … 0−23 … −3−27 … −7
6–10+80 … +260+40 … +112+13 … +50+5 … +290 … +24−10 … +14−19 … +5−24 … 0−28 … −4−32 … −8
10–18+95 … +315+50 … +136+16 … +61+6 … +350 … +29−12 … +17−23 … +6−29 … 0−34 … −5−39 … −10
18–30+110 … +370+65 … +169+20 … +74+7 … +410 … +34−15 … +19−28 … +6−35 … −1−41 … −7−48 … −14
30–40+120 … +440+80 … +204+25 … +89+9 … +500 … +41−18 … +23−33 … +8−42 … −1−50 … −9−59 … −18
40–50+130 … +450+80 … +204+25 … +89+9 … +500 … +41−18 … +23−33 … +8−42 … −1−50 … −9−59 … −18
50–65+140 … +520+100 … +248+30 … +106+10 … +590 … +49−21 … +28−39 … +10−51 … −2−60 … −11−72 … −23
65–80+150 … +530+100 … +248+30 … +106+10 … +590 … +49−21 … +28−39 … +10−51 … −2−62 … −13−78 … −29
80–100+170 … +610+120 … +294+36 … +125+12 … +690 … +57−25 … +32−45 … +12−59 … −2−73 … −16−93 … −36
100–120+180 … +620+120 … +294+36 … +125+12 … +690 … +57−25 … +32−45 … +12−59 … −2−76 … −19−101 … −44
120–140+200 … +700+145 … +345+43 … +146+14 … +790 … +65−28 … +37−52 … +13−68 … −3−88 … −23−117 … −52
140–160+210 … +710+145 … +345+43 … +146+14 … +790 … +65−28 … +37−52 … +13−68 … −3−90 … −25−125 … −60
160–180+230 … +730+145 … +345+43 … +146+14 … +790 … +65−28 … +37−52 … +13−68 … −3−93 … −28−133 … −68
180–200+240 … +820+170 … +400+50 … +168+15 … +900 … +75−33 … +42−60 … +15−79 … −4−106 … −31−151 … −76
200–225+260 … +840+170 … +400+50 … +168+15 … +900 … +75−33 … +42−60 … +15−79 … −4−109 … −34−159 … −84
225–250+280 … +860+170 … +400+50 … +168+15 … +900 … +75−33 … +42−60 … +15−79 … −4−113 … −38−169 … −94
250–280+300 … +940+190 … +450+56 … +189+17 … +1010 … +84−36 … +48−66 … +18−88 … −4−126 … −42−190 … −106
280–315+330 … +970+190 … +450+56 … +189+17 … +1010 … +84−36 … +48−66 … +18−88 … −4−130 … −46−202 … −118
315–355+360 … +1080+210 … +490+62 … +208+18 … +1110 … +93−40 … +53−73 … +20−98 … −5−144 … −51−226 … −133
355–400+400 … +1120+210 … +490+62 … +208+18 … +1110 … +93−40 … +53−73 … +20−98 … −5−150 … −57−244 … −151
400–450+440 … +1240+230 … +540+68 … +228+20 … +1230 … +103−45 … +58−80 … +23−108 … −5−166 … −63−272 … −169
450–500+480 … +1280+230 … +540+68 … +228+20 … +1230 … +103−45 … +58−80 … +23−108 … −5−172 … −69−292 … −189

Assumptions and sources

Need a size or setting that is not in the chart?The calculator handles any hole and shaft letter from C to S and grades IT5 to IT11 for your exact diameter, in µm or inches, and works out the shrink-fit temperature.
Calculate for your exact case →

FAQ

What does H7/g6 mean?

H7 is the hole: fundamental deviation H (lower limit at the nominal size) and tolerance grade IT7. g6 is the shaft: deviation g (slightly below nominal) and grade IT6. Together they make a close sliding fit – for 25 mm the play is 7 to 41 µm.

How do I read the deviation tables?

Each cell shows the upper deviation above the lower one, in µm. Add them to the nominal size: a 40 mm k6 shaft (range 30–40) has +18 / +2 µm, so it must measure 40.002 to 40.018 mm.

Which fit should I use?

H7/h6 or H7/g6 for parts that must slide or be located by hand, H7/k6 or H7/n6 for gears and couplings that need accurate location (light press or mallet), H7/p6 for press-fitted bushes and pins, H7/r6 or H7/s6 for permanent press or shrink fits that carry torque.

Is 18 mm in the 10–18 or the 18–30 range?

In 10–18. ISO 286 ranges run “over 10 up to and including 18”, so a size exactly at a range limit belongs to the lower row.

What is the difference between a transition and an interference fit?

An interference fit is tight for every pair of parts within tolerance. A transition fit such as H7/k6 can give a little play or a little interference depending on where the actual sizes fall – fine for location, but not to transmit torque on its own.

Tools for this job

What you need to build, measure or check the result.

Outside micrometer setMeasure shaft limitsView on Amazon →Bore gaugeMeasure hole limitsView on Amazon →Gauge pin setGo/no-go checksView on Amazon →

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