Standard Bore Sprockets (Stock Bore)

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0-type-A-sprocket-1

Type A

Flat sprocket platewheel with no hub extension either side.

0-type-B-sprocket-1

Type B

Sprocket with hub extension one side

0-type-c-sprocket-1

Type C

Sprocket with hub extension both sides

European Standard PDF
American Standard PDF
Asian Standard PDF

European Standard

No. Size Tooth radius r3 Radius width C Pitch Internal width Roller φ Tooth range
03B-1 5*2.5mm 5 0.6 5 2.5 3.2 8-125
04B-1 6*2.8mm 6 0.7 6 2.8 4 8-125
ASA25 1/4″*1/8″ 6.4 0.7 6.35 3.18 3.3 8-125
05B-1-2 8*3mm 8 1 8 3 5 8-125
06B-1-2-3 3/8″*7/32″ 10 1 9.525 5.72 6.35 8-125
081B-1 1/2″*1/8″ 13 1 12.7 3.3 7.75 8-125
083B/084B-1 1/2″*3/16″ 13 1.3 12.7 4.88 7.75 8-125
085B-1 1/2″*1/4″ roller 7.75 13 1.3 12.7 6.4 7.75 8-125
085B-1 1/2″*1/4″ roller 8.51 13 1.3 12.7 6.4 8.51 8-125
08B-1-2-3 1/2″*5/16″ 13 1.3 12.7 7.75 8.51 8-125
10B-1-2-3 5/8″*3/8″ 16 1.6 15.875 9.65 10.16 8-125
12B-1-2-3 3/4″*7/16″ 19 2 19.05 11.68 12.07 8-125
16B-1-2-3 1″*17.02mm 26 2.5 25.4 17.02 15.88 8-125
20B-1-2-3 1″1/4*3/4″ 32 3.5 31.75 19.55 19.05 8-114
24B-1-2-3 1″1/2*1″ 38 4 38.1 25.4 25.4 8-90
28B-1-2-3 1″3/4*1″1/4 44 5 44.45 30.99 27.94 8-76
32B-1-2-3 2″*1″1/4 51 5 50.8 30.99 29.21 8-76

American standard

No. Pitch Roller φ Tooth width Tooth range Type
No.25 1/4″ 1.30″ B1=0.110″ 9-72 A B
No.35 3/8″ 0.2 B1=0.168″ 8-112 A B
No.35-2 3/8″ 0.200″ b1=0.162″ B2=0.561″ 12-102 B
No35-3 3/8″ 0.200″ b1=0.162″ B2=0.561″ B3=0.960″ 13-102 B
No.41 1/2″ 0.306″ B1=0.227″ 6-112 A B
No.40 1/2″ 0.312″ B1=0.284″ 8-112 A B
No.40-2 1/2″ 0.312″ b1=0.275″ B2=0.841″ 11-112 B
No.40-3 1/2″ 0.312″ b1=0.275″ B2=0.841″ B3=1.407″ 11-102 B
No.50 5/8″ 0.400″ B1=0.343″ 8-112 A B
No.50-2 5/8″ 0.400″ b1=0.332“ B2=1.045” 11-112
No.50-3 5/8″ 0.400″ b1=0.332“ B2=1.045” B3=1.758” 11-102 B C
No.60 3/4″ 0.468″ B1=0.459″ 8-112 A B
No.60-2 3/4″ 0.468″ b1=0.444“ B2=1.341” 11-95 B C
No.60-3 3/4″ 0.468″ b1=0.444“ B2=1.341” B3=2.238” 11-95 B C
No.80 1″ 0.625″ B1=0.575″ 8-112 A B C
No.80-2 1″ 0.625″ b1=0.575″ B2=1.710″ 10-95 B C
No.80-3 1″ 0.625″ b1=0.575″ B2=1.710″ B3=2.863″ 11-95 B C
No.100 1 1/4″ 0.750″ B1=0.692″ 7-96 A B C
No.100-2 1 1/4″ 0.750″ b1=0.669″ B2=2.077″ 9-80 B C
No.100-3 1 1/4″ 0.750″ b1=0.669″ B2=2.077″ B3=3.485″ 11-80 B C
No.120 1 1/2″ 0.875″ B1=0.924″ 8-90 A B C
No.120-2 1 1/2″ 0.875″ b1=0.894″ B2=2.683″ 11-60 B C
No.140 1 3/4″ 1.000″ b1=0.924″ 11-80 A B C
No.140-2 1 3/4″ 1.000″ b1=0.894″ B2=2.818″ 13-60 B C
No.160 2″ 1.125″ B1=1.156″ 8-80 A B C
No.160-2 2″ 1.125″ b1=1.119″ B2=3.424″ 13-60 B C
No.200 2 1/2″ 1.562″ B1=1.389″ 10-60 A B C
No.200-2 2 1/2″ 1.562″ b1=1.344″ B2=4.161″ 11-60 B C
No.240 3″ 1.875″ B1=1.738″ 10-60 A B C

Asian standard

No. Tooth width T Pitch P Internal width W Roller Dr Teeth Range
NK11SB 1.6 3.7465 1.83 2.285 12-48
NK15B 4.7625 2.38 2.48 11-35
NK25B 2.8 6.35 3.18 3.3 10-80
NK35B 4.3 9.525 4.78 5.08 9-80
NK410B 2.8 12.7 3.4 7.77 10-40
NK40B 7.2 12.7 7.95 7.95 9-90
NK50B 8.7 15.875 9.53 8-90
NK60B 11.7 19.05 12.7 11.91 9-90
NK80B 14.6 25.4 15.88 15.88 9-90
NK100B/NK100C 17.6 31.75 19.05 19.05 9-75
NK120B/NK120C 23.5 38.1 25.4 22.23 10-60
NK140B/NK140C 23.5 44.45 25.22 25.4 10-60
NK160B/NK160C 29.4 50.8 31.55 28.58 10-35 40-60
NK180B/NK180B 33 57.15 35.72 35.71 11-20 21-60
NK200B/NK200C 35.3 63.5 37.85 39.68 11-18 19-60
NK35-2B 4.1 9.525 4.78 5.08 10-60
NK40-2B 7 12.7 7.95 7.95 10-70
NK50-2B 8.4 15.875 9.53
NK60-2B
NK80-2B 15.88 15.88
NK100-2B
NK100-2C
NK120-2B
NK120-2C
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