fuN >0,63-1 >1-1,6 >1,6-2,5 >2,5-4 >4-6,3 >6,3-10 >10-16 >16-25 >25-40 TOLERANCES / DIN 3968 (CONTIN.) Accuracy Requirements for Single Thread Hobs Tolerance in µm (1 µm = 0,001 mm) at module No. Measured dimension short qualitydescript.class Pitch error of the cutting face of gashes AA 10 10 12 16 20 25 32 40 50 Prüfdiagramm A 12 16 20 25 32 40 50 63 80 /Inspection chart B 25 32 40 50 63 80 100 125 160 Null C 50 63 80 100 125 160 200 250 345 9 fuN D 100 125 160 200 250 315 400 500 630 zero 1 2 3 4 5 6 7 8 9 10 11 12 Tooth profile deviation AA 6 6 6 8 10 12 14 18 22 FfS A 10 11 12 14 16 20 25 32 40 B 20 22 25 28 32 40 50 63 80 C 40 45 50 56 63 80 100 125 160 12 FfS Tooth thickness AA – 16 – 16 – 16 – 20 – 25 – 32 – 40 – 50 – 63 S A – 25 – 28 – 32 – 36 – 40 – 50 – 63 – 80 – 100 B – 50 – 56 – 63 – 71 – 80 – 100 – 125 – 160 – 200 C – 100 – 112 – 125 – 140 – 160 – 200 – 250 – 320 – 400 13 fS D – 100 – 112 – 125 – 140 – 160 – 200 – 250 – 320 – 400 Lead deviation on adjacent teeth AA ±4 ±4 ±4 ±5 ±6 ±8 ± 10 ± 12 ± 16 A ±6 ±7 ±8 ±9 ± 10 ± 12 ± 16 ± 20 ± 25 B ± 12 ± 14 ± 16 ± 18 ± 20 ± 25 ± 32 ± 40 ± 50 C ± 25 ± 28 ± 32 ± 36 ± 40 ± 50 ± 63 ± 80 ±100 D ± 50 ± 56 ± 63 ± 71 ± 80 ±100 ±125 ±160 ±200 HN • H HN • H i(HN ±H) i(HN ±H) 14 fHF 46