ISO 286 fundamental deviations

ISO 286-1:2010 fundamental deviations for shaft letters a–z and hole letters A–Z, in µm for sizes up to 500 mm. The fundamental deviation is the end of the tolerance zone closest to the nominal size — es/ei for shafts, EI/ES for holes: shaft g at 18–30 mm has es = −7 µm, so hole G has EI = +7 µm.

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.

Classes

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