Table 5a. British Standard Fundamental Deviations for Shafts BS 4500:1969
Grade
Nominal Sizes, mm
≤ 3 >7
01 to 16
5–6
7
8
4–7
Fundamental (Upper) Deviation es
Fundamental (Lower) Deviation ei
b a
c
cd
d
e
ef
f
fg –4 –6 –8
g
h 0 0 0 0 0 0 0 0 0
js b
j
k
Over
To
a a
… 3
0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
–270 –270 –280 –290 –290 –300 –300 –310 –320 –340 –360 –380 –410 –460 –520 –580
–140 –140 –150 –150 –150 –160 –160 –170 –180 –190 –200 –220 –240 –260 –280 –310 –340 –380 –420 –480 –540 –600 –680 –760 –840
–60 –70 –80 –95
–34 –46 –56
–20 –30 –40
–14 –20 –25 –32 –32 –40 –40 –50 –50 –60 –60 –72 –72 –85 –85 –85
–10 –14 –18
–6
–2 –4 –5
–6
–2 –2 –2 –3 –3 –4 –4 –5 –5 –7 –7 –9 –9
–4 –4 –5 –6 –6 –8 –8
3 6
6
… +1 … +1 … +1 … +1 … +2 … +2 … +2 … +2 … +2 … +2 … +3 … +3 … +3 … +3 … +3 … +4 … +4 … +4 … +4 … +4 … +4 … +4 … +5 … +5
–10 –13
10 14 18 24 30 40 50 65 80
10 14 18 24 30 40 50 65 80
… –50 … –50 … –65 … –65 … –80 … –80 … –100 … –100 … –120 … –120 … –145 … –145 … –145 … –170 … –170 … –170 … –190 … –190 … –210 … –210 … –230 … –230
… –16 … –16 … –20 … –20 … –25 … –25 … –30 … –30 … –36 … –36 … –43 … –43 … –43 … –50 … –50 … –50 … –56 … –56 … –62 … –62 … –68 … –68
… –6 … –6 … –7 … –7 … –9 … –9
–95 –110 –110 –120 –130 –140 –150 –170 –180 –200 –210 –230 –240 –260 –280 –300 –330 –360 –400 –440 –480
–10 –10 –12 –12 –15 –15 –18 –18 –18 –21 –21 –21 –26 –26 –28 –28 –32 –32
… –10 0 … –10 0 … –12 0 … –12 0 … –14 0 … –14 0 … –14 0 … –15 0 … –15 0 … –15 0 … –17 0 … –17 0 … –18 0 … –18 0 … –20 0 … –20 0
100 120 140 160 180 200 225 250 280 315 355 400 450 500
100 120 140 160 180 200 225 250 280 315 355 400 450
± IT/2
–11 –11 –11 –13 –13 –13 –16 –16 –18 –18 –20 –20
–660 –740 –820 –920 –1050 –1200 –1350 –1500 –1650
–100 –100 –100 –110 –110 –125 –125 –135 –135
a Not applicable to sizes up to 1 mm. b In grades 7 to 11, the two symmetrical deviations ± IT/2 should be rounded if the IT value in micrometers is an odd value by replacing it with the even value immediately below. For example, if IT = 175, replace it by 174.
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