Tables / ANSI 25

Sprocket chart 1/4" x 1/8" — ANSI 25 (04C)

Chain American ANSI B29.1 · pitch 0.250" (6.35 mm) · roller Ø 0.130" · inner width 0.125" · simplex tooth width 0.116". Dimensions in inches. Tap a row to open it in the calculator (duplex, triplex, mm, material).

N	PD	OD	BD	CD	Max hub
8	0.653	0.754	0.523	0.523	0.327
9	0.731	0.837	0.601	0.590	0.410
10	0.809	0.919	0.679	0.679	0.493
11	0.887	1.001	0.757	0.748	0.575
12	0.966	1.083	0.836	0.836	0.657
13	1.045	1.164	0.915	0.907	0.738
14	1.123	1.245	0.994	0.994	0.819
15	1.202	1.326	1.073	1.066	0.900
16	1.281	1.407	1.152	1.152	0.980
17	1.361	1.487	1.231	1.225	1.061
18	1.440	1.568	1.310	1.310	1.141
19	1.519	1.648	1.389	1.384	1.222
20	1.598	1.728	1.468	1.468	1.302
21	1.677	1.809	1.547	1.543	1.382
22	1.757	1.889	1.627	1.627	1.462
23	1.836	1.969	1.706	1.702	1.542
24	1.915	2.049	1.785	1.785	1.623
25	1.995	2.129	1.865	1.861	1.703
26	2.074	2.209	1.944	1.944	1.783
27	2.153	2.289	2.024	2.020	1.862
28	2.233	2.369	2.103	2.103	1.942
29	2.312	2.449	2.182	2.179	2.022
30	2.392	2.529	2.262	2.262	2.102
31	2.471	2.608	2.341	2.338	2.182
32	2.551	2.688	2.421	2.421	2.262
33	2.630	2.768	2.500	2.497	2.342
34	2.709	2.848	2.580	2.580	2.422
35	2.789	2.928	2.659	2.656	2.501
36	2.868	3.008	2.739	2.739	2.581
37	2.948	3.087	2.818	2.815	2.661
38	3.027	3.167	2.897	2.897	2.741
39	3.107	3.247	2.977	2.974	2.820
40	3.186	3.327	3.056	3.056	2.900
41	3.266	3.406	3.136	3.134	2.980
42	3.345	3.486	3.215	3.215	3.060
43	3.425	3.566	3.295	3.293	3.139
44	3.504	3.645	3.374	3.374	3.219
45	3.584	3.725	3.454	3.452	3.299
46	3.663	3.805	3.533	3.533	3.378
47	3.743	3.885	3.613	3.611	3.458
48	3.822	3.964	3.693	3.693	3.538
49	3.902	4.044	3.772	3.770	3.618
50	3.981	4.124	3.852	3.852	3.697
51	4.061	4.203	3.931	3.929	3.777
52	4.141	4.283	4.011	4.011	3.857
53	4.220	4.363	4.090	4.088	3.936
54	4.300	4.442	4.170	4.170	4.016
55	4.379	4.522	4.249	4.247	4.096
56	4.459	4.602	4.329	4.329	4.175
57	4.538	4.681	4.408	4.407	4.255
58	4.618	4.761	4.488	4.488	4.335
59	4.697	4.841	4.567	4.566	4.414
60	4.777	4.920	4.647	4.647	4.494
61	4.856	5.000	4.726	4.725	4.574
62	4.936	5.080	4.806	4.806	4.653
63	5.015	5.159	4.886	4.884	4.733
64	5.095	5.239	4.965	4.965	4.812
65	5.175	5.319	5.045	5.043	4.892
66	5.254	5.398	5.124	5.124	4.972
67	5.334	5.478	5.204	5.202	5.051
68	5.413	5.557	5.283	5.283	5.131
69	5.493	5.637	5.363	5.361	5.211
70	5.572	5.717	5.442	5.442	5.290
71	5.652	5.796	5.522	5.521	5.370
72	5.731	5.876	5.601	5.601	5.450
73	5.811	5.956	5.681	5.680	5.529
74	5.891	6.035	5.761	5.761	5.609
75	5.970	6.115	5.840	5.839	5.688
76	6.050	6.194	5.920	5.920	5.768
77	6.129	6.274	5.999	5.998	5.848
78	6.209	6.354	6.079	6.079	5.927
79	6.288	6.433	6.158	6.157	6.007
80	6.368	6.513	6.238	6.238	6.087
81	6.447	6.593	6.317	6.316	6.166
82	6.527	6.672	6.397	6.397	6.246
83	6.607	6.752	6.477	6.475	6.325
84	6.686	6.831	6.556	6.556	6.405
85	6.766	6.911	6.636	6.635	6.485
86	6.845	6.991	6.715	6.715	6.564
87	6.925	7.070	6.795	6.794	6.644
88	7.004	7.150	6.874	6.874	6.723
89	7.084	7.229	6.954	6.953	6.803
90	7.163	7.309	7.034	7.034	6.883
91	7.243	7.389	7.113	7.112	6.962
92	7.323	7.468	7.193	7.193	7.042
93	7.402	7.548	7.272	7.271	7.121
94	7.482	7.627	7.352	7.352	7.201
95	7.561	7.707	7.431	7.430	7.281
96	7.641	7.787	7.511	7.511	7.360
97	7.720	7.866	7.590	7.589	7.440
98	7.800	7.946	7.670	7.670	7.520
99	7.879	8.026	7.750	7.749	7.599
100	7.959	8.105	7.829	7.829	7.679
101	8.039	8.185	7.909	7.908	7.758
102	8.118	8.264	7.988	7.988	7.838
103	8.198	8.344	8.068	8.067	7.918
104	8.277	8.424	8.147	8.147	7.997
105	8.357	8.503	8.227	8.226	8.077
106	8.436	8.583	8.307	8.307	8.156
107	8.516	8.662	8.386	8.385	8.236
108	8.596	8.742	8.466	8.466	8.316
109	8.675	8.822	8.545	8.544	8.395
110	8.755	8.901	8.625	8.625	8.475
111	8.834	8.981	8.704	8.703	8.554
112	8.914	9.060	8.784	8.784	8.634
113	8.993	9.140	8.863	8.863	8.714
114	9.073	9.220	8.943	8.943	8.793
115	9.153	9.299	9.023	9.022	8.873
116	9.232	9.379	9.102	9.102	8.952
117	9.312	9.458	9.182	9.181	9.032
118	9.391	9.538	9.261	9.261	9.112
119	9.471	9.618	9.341	9.340	9.191
120	9.550	9.697	9.420	9.420	9.271

PD = p / sin(180°/N) · OD = p·(0.6 + cot(180°/N)) · BD = PD − roller Ø · CD = BD (even N) or PD·cos(90°/N) − roller Ø (odd N).