Table 6a. British Standard Fundamental Deviations for Holes BS 4500:1969
Grade
Nominal Sizes, mm
01 to 16
6 7 8
≤ 8 >8
≤ 8 a
>8
≤ 8 >8 b
Fundamental (Lower) Deviation EI
Fundamental (Upper) Deviation ES
Over
To
A b
B b
C CD D E EF FFGGH Js c
J
K d
M d
N d
+2 +4 +6
0
0
… 3
+270 +140 +60 +34 +20 +14 +10 +6 +4 +2 0
–2
–2
–4
–4
3 6 +270 +140 +70 +46 +30 +20 +14 +10 +6 +4 0 6 10 +280 +150 +80 +56 +40 +25 +18 +13 +8 +5 0
+5 +6 +10 –1+ D +5 +8 +12 –1+ D +6 +10 +15 –1+ D +6 +10 +15 –1+ D +8 +12 +20 –2+ D +8 +12 +20 –2+ D +10 +14 +24 –2+ D +10 +14 +24 –2+ D +13 +18 +28 –2+ D +13 +18 +28 –2+ D +16 +22 +34 –3+ D +16 +22 +34 –3+ D +18 +26 +41 –3+ D +18 +26 +41 –3+ D +18 +26 +41 –3+ D +22 +30 +47 –4+ D +22 +30 +47 –4+ D +22 +30 +47 –4+ D +25 +36 +55 –4+ D +25 +36 +55 –4+ D +29 +39 +60 –4+ D +29 +39 +60 –4+ D
… –4+ D … –6+ D … –7+ D … –7+ D … –8+ D … –8+ D … –9+ D … –9+ D
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
–4 –8+ D –6 –10+ D –7 –12+ D –7 –12+ D –8 –15+ D –8 –15+ D –9 –17+ D –9 –17+ D
10 14 +290 +150 +95 14 18 +290 +150 +95
… +50 +32 … +16… +60 … +50 +32 … +16… +60
18 24 +300 +160 +110 … +65 +40 … +20 … +7 0 24 30 +300 +160 +110 … +65 +40 … +20 … +7 0 30 40 +310 +170 +120 … +80 +50 … +25 … +9 0 40 50 +320 +180 +130 … +80 +50 … +25 … +9 0 50 65 +340 +190 +140 … +100 +60 … +30 … +10 0 65 80 +360 +200 +150 … +100 +60 … +30 … +10 0 80 100 +380 +220 +170 … +120 +72 … +36 … +12 0 100 120 +410 +240 +180 … +120 +72 … +36 … +12 0 120 140 +460 +260 +200 … +145 +85 … +43 … +14 0 140 160 +520 +280 +210 … +145 +85 … +43 … +14 0 160 180 +580 +310 +230 … +145 +85 … +43 … +14 0 180 200 +660 +340 +240 … +170 +100 … +50 … +15 0 200 225 +740 +380 +260 … +170 +100 … +50 … +15 0 225 250 +820 +420 +280 … +170 +100 … +50 … +15 0 250 280 +920 +480 +300 … +190 +110 … +56 … +17 0 280 315 +1050 +540 +330 … +190 +110 … +56 … +17 0 315 355 +1200 +600 +360 … +210 +125 … +62 … +18 0 355 400 +1350 +680 +400 … +210 +125 … +62 … +18 0 400 450 +1500 +760 +440 … +230 +135 … +68 … +20 0 450 500 +1650 +840 +480 … +230 +135 … +68 … +20 0
… –11+ D –11 –20+ D … –11+ D –11 –20+ D … –13+ D –13 –23+ D … –13+ D –13 –23+ D … –15+ D –15 –27+ D … –15+ D –15 –27+ D … –15+ D –15 –27+ D … –17+ D –17 –31+ D … –17– D –17 –31+ D … –17+ D –17 –31+ D … –20+ D –20 –34+ D … –20+ D –20 –34+ D … –21+ D –21 –37+ D … –21+ D –21 –37+ D
± IT/2
+33 +43 +66 –5+4 … –23+ D –23 –40+ D +33 +43 +66 –5+4 … –23+ D –23 –40+ D
a Special case: for M6, ES = –9 for sizes from 250 to 315 mm, instead of –11. b Not applicable to sizes up to 1 mm. c 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 below. For example, if IT = 175, replace it by 174. d When calculating deviations for holes K, M, and N with tolerance grades up to and including IT8, and holes P to ZC with tolerance grades up to and including IT7, the delta (∆ ) values are added to the upper deviation ES. For example, for 25 P7, ES = –0.022 + 0.008 = –0.014 mm.
Made with FlippingBook - Share PDF online