ISO 286 fundamental deviations

The fundamental deviation is the end of a tolerance zone closest to the nominal size — es/ei for shafts, EI/ES for holes — in µm, for sizes up to 500 mm.

Shaft fundamental deviations (µm)

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Shaft fundamental deviations by size and letter
Size (mm)es — upper deviation (a…h)ei — lower deviation (k…z)
abcdefghkmnprstuvxyz
≤ 3−270−140−60−20−14−6−200+2+4+6+10+14—+18—+20—+26
3 – 6−270−140−70−30−20−10−40+1+4+8+12+15+19—+23—+28—+35
6 – 10−280−150−80−40−25−13−50+1+6+10+15+19+23—+28—+34—+42
10 – 14−290−150−95−50−32−16−60+1+7+12+18+23+28—+33—+40—+50
14 – 18−290−150−95−50−32−16−60+1+7+12+18+23+28—+33+39+45—+60
18 – 24−300−160−110−65−40−20−70+2+8+15+22+28+35—+41+47+54+63+73
24 – 30−300−160−110−65−40−20−70+2+8+15+22+28+35+41+48+55+64+75+88
30 – 40−310−170−120−80−50−25−90+2+9+17+26+34+43+48+60+68+80+94+112
40 – 50−320−180−130−80−50−25−90+2+9+17+26+34+43+54+70+81+97+114+136
50 – 65−340−190−140−100−60−30−100+2+11+20+32+41+53+66+87+102+122+144+172
65 – 80−360−200−150−100−60−30−100+2+11+20+32+43+59+75+102+120+146+174+210
80 – 100−380−220−170−120−72−36−120+3+13+23+37+51+71+91+124+146+178+214+258
100 – 120−410−240−180−120−72−36−120+3+13+23+37+54+79+104+144+172+210+254+310
120 – 140−460−260−200−145−85−43−140+3+15+27+43+63+92+122+170+202+248+300+365
140 – 160−520−280−210−145−85−43−140+3+15+27+43+65+100+134+190+228+280+340+415
160 – 180−580−310−230−145−85−43−140+3+15+27+43+68+108+146+210+252+310+380+465
180 – 200−660−340−240−170−100−50−150+4+17+31+50+77+122+166+236+284+350+425+520
200 – 225−740−380−260−170−100−50−150+4+17+31+50+80+130+180+258+310+385+470+575
225 – 250−820−420−280−170−100−50−150+4+17+31+50+84+140+196+284+340+425+520+640
250 – 280−920−480−300−190−110−56−170+4+20+34+56+94+158+218+315+385+475+580+710
280 – 315−1050−540−330−190−110−56−170+4+20+34+56+98+170+240+350+425+525+650+790
315 – 355−1200−600−360−210−125−62−180+4+21+37+62+108+190+268+390+475+590+730+900
355 – 400−1350−680−400−210−125−62−180+4+21+37+62+114+208+294+435+530+660+820+1000
400 – 450−1500−760−440−230−135−68−200+5+23+40+68+126+232+330+490+595+740+920+1100
450 – 500−1650−840−480−230−135−68−200+5+23+40+68+132+252+360+540+660+820+1000+1250

k: value applies to grades 4–7, otherwise 0. js: ±IT/2 (not tabulated). a, b: not used at or below 1 mm.

Shaft j (µm)

Size (mm)j5, j6j7
≤ 3−2−4
3 – 6−2−4
6 – 10−2−5
10 – 18−3−6
18 – 30−4−8
30 – 50−5−10
50 – 80−7−12
80 – 120−9−15
120 – 180−11−18
180 – 250−13−21
250 – 315−16−26
315 – 400−18−28
400 – 500−20−32

ei shown; es = ei + IT for the class's grade. j is only defined for grades 5, 6 and 7.

Hole fundamental deviations (µm)

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Hole fundamental deviations by size and letter
Size (mm)EI — lower deviation (A…H)ES — upper deviation (K…Z)
abcdefghkmnprstuvxyz
≤ 3+270+140+60+20+14+6+200−2−4−6−10−14—−18—−20—−26
3 – 6+270+140+70+30+20+10+40−1−4−8−12−15−19—−23—−28—−35
6 – 10+280+150+80+40+25+13+50−1−6−10−15−19−23—−28—−34—−42
10 – 14+290+150+95+50+32+16+60−1−7−12−18−23−28—−33—−40—−50
14 – 18+290+150+95+50+32+16+60−1−7−12−18−23−28—−33−39−45—−60
18 – 24+300+160+110+65+40+20+70−2−8−15−22−28−35—−41−47−54−63−73
24 – 30+300+160+110+65+40+20+70−2−8−15−22−28−35−41−48−55−64−75−88
30 – 40+310+170+120+80+50+25+90−2−9−17−26−34−43−48−60−68−80−94−112
40 – 50+320+180+130+80+50+25+90−2−9−17−26−34−43−54−70−81−97−114−136
50 – 65+340+190+140+100+60+30+100−2−11−20−32−41−53−66−87−102−122−144−172
65 – 80+360+200+150+100+60+30+100−2−11−20−32−43−59−75−102−120−146−174−210
80 – 100+380+220+170+120+72+36+120−3−13−23−37−51−71−91−124−146−178−214−258
100 – 120+410+240+180+120+72+36+120−3−13−23−37−54−79−104−144−172−210−254−310
120 – 140+460+260+200+145+85+43+140−3−15−27−43−63−92−122−170−202−248−300−365
140 – 160+520+280+210+145+85+43+140−3−15−27−43−65−100−134−190−228−280−340−415
160 – 180+580+310+230+145+85+43+140−3−15−27−43−68−108−146−210−252−310−380−465
180 – 200+660+340+240+170+100+50+150−4−17−31−50−77−122−166−236−284−350−425−520
200 – 225+740+380+260+170+100+50+150−4−17−31−50−80−130−180−258−310−385−470−575
225 – 250+820+420+280+170+100+50+150−4−17−31−50−84−140−196−284−340−425−520−640
250 – 280+920+480+300+190+110+56+170−4−20−34−56−94−158−218−315−385−475−580−710
280 – 315+1050+540+330+190+110+56+170−4−20−34−56−98−170−240−350−425−525−650−790
315 – 355+1200+600+360+210+125+62+180−4−21−37−62−108−190−268−390−475−590−730−900
355 – 400+1350+680+400+210+125+62+180−4−21−37−62−114−208−294−435−530−660−820−1000
400 – 450+1500+760+440+230+135+68+200−5−23−40−68−126−232−330−490−595−740−920−1100
450 – 500+1650+840+480+230+135+68+200−5−23−40−68−132−252−360−540−660−820−1000−1250

K, M, N up to IT8 and P…Z up to IT7 above 3 mm: add Δ from the table below (ES = −ei + Δ). N above IT8: ES = 0 above 3 mm. K above IT8: not defined above 3 mm. M6 at 250–315 mm: ES = −9 (Table 2 note b).

Δ values (µm)

Size (mm)IT3IT4IT5IT6IT7IT8
≤ 3——————
3 – 6+1+1.5+1+3+4+6
6 – 10+1+1.5+2+3+6+7
10 – 18+1+2+3+3+7+9
18 – 30+1.5+2+3+4+8+12
30 – 50+1.5+3+4+5+9+14
50 – 80+2+3+5+6+11+16
80 – 120+2+4+5+7+13+19
120 – 180+3+4+6+7+15+23
180 – 250+3+4+6+9+17+26
250 – 315+4+4+7+9+20+29
315 – 400+4+5+7+11+21+32
400 – 500+5+5+7+13+23+34

Δ = ITn − IT(n−1). Δ is not applied at or below 3 mm.

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