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

ES