It can often be difficult to find the right size sprocket. PEER Chain is a strong and reliable source that you can count on for all your sprocket needs. Our team of professionals has been working with chains and sprockets for decades. We can help you find exactly the right part for your needs by using our sprocket search feature or sprocket size chart. If you have struggled in the past by trying to find the right parts with other organizations, that’s not going to happen at PEER Chain. If we don’t have the roller chain sprockets or conveyor chain sprockets that you need for your project, we can custom manufacture items to customer specifications. We typically keep thousands of unique sprockets in stock and are able to ship them out the same day which can be found on our sprocket size chart. When your company loses valuable time, you lose money. At PEER Chain, we are committed to helping you find the right parts so that your downtime is minimized.

Sprocket Size Chart: Pitch Diameter

# of Teeth	25	35	40	50	60	80	100	120	140	160	180	200	240
2	0.25	0.38	0.50	0.63	0.75	1.00	1.25	1.50	1.75	2.00	2.25	2.50	3.00
3	0.289	0.433	0.577	0.722	0.866	1.155	1.443	1.732	2.021	2.309	2.598	2.887	3.464
4	0.354	0.530	0.707	0.884	1.061	1.414	1.768	2.121	2.475	2.828	3.182	3.536	4.243
5	0.425	0.638	0.851	1.063	1.276	1.701	2.127	2.552	2.977	3.403	3.828	4.253	5.104
6	0.500	0.750	1.000	1.250	1.500	2.000	2.500	3.000	3.500	4.000	4.500	5.000	6.000
7	0.576	0.864	1.152	1.440	1.729	2.305	2.881	3.457	4.033	4.610	5.186	5.762	6.914
8	0.653	0.980	1.307	1.633	1.960	2.613	3.266	3.920	4.573	5.226	5.880	6.533	7.839
9	0.731	1.096	1.462	1.827	2.193	2.924	3.655	4.386	5.117	5.848	6.579	7.310	8.771
10	0.809	1.214	1.618	2.023	2.427	3.236	4.045	4.854	5.663	6.472	7.281	8.090	9.708
11	0.887	1.331	1.775	2.218	2.662	3.549	4.437	5.324	6.212	7.099	7.986	8.874	10.648
12	0.966	1.449	1.932	2.415	2.898	3.864	4.830	5.796	6.761	7.727	8.693	9.659	11.591
13	1.045	1.567	2.089	2.612	3.134	4.179	5.223	6.268	7.313	8.357	9.402	10.446	12.536
14	1.123	1.685	2.247	2.809	3.370	4.494	5.617	6.741	7.864	8.988	10.111	11.235	13.482
15	1.202	1.804	2.405	3.006	3.607	4.810	6.012	7.215	8.417	9.619	10.822	12.024	14.429
16	1.281	1.922	2.563	3.204	3.844	5.126	6.407	7.689	8.970	10.252	11.533	12.815	15.377
17	1.361	2.041	2.721	3.401	4.082	5.442	6.803	8.163	9.524	10.884	12.245	13.605	16.327
18	1.440	2.160	2.879	3.599	4.319	5.759	7.198	8.638	10.078	11.518	12.957	14.397	17.276
19	1.519	2.278	3.038	3.797	4.557	6.076	7.594	9.113	10.632	12.151	13.670	15.189	18.227
20	1.598	2.397	3.196	3.995	4.794	6.392	7.991	9.589	11.187	12.785	14.383	15.981	19.177
21	1.677	2.516	3.355	4.193	5.032	6.710	8.387	10.064	11.742	13.419	15.096	16.774	20.129
22	1.757	2.635	3.513	4.392	5.270	7.027	8.783	10.540	12.297	14.053	15.810	17.567	21.080
23	1.836	2.754	3.672	4.590	5.508	7.344	9.180	11.016	12.852	14.688	16.524	18.360	22.032
24	1.915	2.873	3.831	4.788	5.746	7.661	9.577	11.492	13.407	15.323	17.238	19.153	22.984
25	1.995	2.992	3.989	4.987	5.984	7.979	9.973	11.968	13.963	15.957	17.952	19.947	23.936
26	2.074	3.111	4.148	5.185	6.222	8.296	10.370	12.444	14.518	16.592	18.667	20.741	24.889
27	2.153	3.230	4.307	5.384	6.460	8.614	10.767	12.921	15.074	17.228	19.381	21.534	25.841
28	2.233	3.349	4.466	5.582	6.699	8.931	11.164	13.397	15.630	17.863	20.096	22.329	26.794
29	2.312	3.468	4.625	5.781	6.937	9.249	11.561	13.874	16.186	18.498	20.810	23.123	27.747
30	2.392	3.588	4.783	5.979	7.175	9.567	11.958	14.350	16.742	19.134	21.525	23.917	28.700
31	2.471	3.707	4.942	6.178	7.413	9.885	12.356	14.827	17.298	19.769	22.240	24.711	29.654
32	2.551	3.826	5.101	6.376	7.652	10.202	12.753	15.303	17.854	20.405	22.955	25.506	30.607
33	2.630	3.945	5.260	6.575	7.890	10.520	13.150	15.780	18.410	21.040	23.670	26.300	31.560
34	2.709	4.064	5.419	6.774	8.128	10.838	13.547	16.257	18.966	21.676	24.385	27.095	32.514
35	2.789	4.183	5.578	6.972	8.367	11.156	13.945	16.734	19.523	22.312	25.101	27.890	33.467
36	2.868	4.303	5.737	7.171	8.605	11.474	14.342	17.211	20.079	22.947	25.816	28.684	34.421
37	2.948	4.422	5.896	7.370	8.844	11.792	14.740	17.687	20.635	23.583	26.531	29.479	35.375
38	3.027	4.541	6.055	7.568	9.082	12.110	15.137	18.164	21.192	24.219	27.247	30.274	36.329
39	3.107	4.660	6.214	7.767	9.321	12.428	15.534	18.641	21.748	24.855	27.962	31.069	37.283
40	3.186	4.780	6.373	7.966	9.559	12.745	15.932	19.118	22.305	25.491	28.677	31.864	38.236
41	3.266	4.899	6.532	8.165	9.798	13.063	16.329	19.595	22.861	26.127	29.393	32.659	39.190
42	3.345	5.018	6.691	8.363	10.036	13.381	16.727	20.072	23.418	26.763	30.108	33.454	40.144
43	3.425	5.137	6.850	8.562	10.275	13.700	17.124	20.549	23.974	27.399	30.824	34.249	41.099
44	3.504	5.257	7.009	8.761	10.513	14.018	17.522	21.026	24.531	28.035	31.539	35.044	42.053
45	3.584	5.376	7.168	8.960	10.752	14.336	17.919	21.503	25.087	28.671	32.255	35.839	43.007
46	3.663	5.495	7.327	9.159	10.990	14.654	18.317	21.980	25.644	29.307	32.971	36.634	43.961
47	3.743	5.614	7.486	9.357	11.229	14.972	18.715	22.458	26.200	29.943	33.686	37.429	44.915
48	3.822	5.734	7.645	9.556	11.467	15.290	19.112	22.935	26.757	30.580	34.402	38.224	45.869
49	3.902	5.853	7.804	9.755	11.706	15.608	19.510	23.412	27.314	31.216	35.118	39.020	46.824
50	3.981	5.972	7.963	9.954	11.944	15.926	19.907	23.889	27.870	31.852	35.833	39.815	47.778
51	4.061	6.092	8.122	10.153	12.183	16.244	20.305	24.366	28.427	32.488	36.549	40.610	48.732
52	4.141	6.211	8.281	10.351	12.422	16.562	20.703	24.843	28.984	33.124	37.265	41.405	49.687
53	4.220	6.330	8.440	10.550	12.660	16.880	21.100	25.320	29.541	33.761	37.981	42.201	50.641
54	4.300	6.449	8.599	10.749	12.899	17.198	21.498	25.798	30.097	34.397	38.696	42.996	51.595
55	4.379	6.569	8.758	10.948	13.137	17.517	21.896	26.275	30.654	35.033	39.412	43.791	52.550
56	4.459	6.688	8.917	11.147	13.376	17.835	22.293	26.752	31.211	35.669	40.128	44.587	53.504
57	4.538	6.807	9.076	11.346	13.615	18.153	22.691	27.229	31.767	36.306	40.844	45.382	54.459
58	4.618	6.927	9.236	11.544	13.853	18.471	23.089	27.707	32.324	36.942	41.560	46.178	55.413
59	4.697	7.046	9.395	11.743	14.092	18.789	23.486	28.184	32.881	37.578	42.276	46.973	56.367
60	4.777	7.165	9.554	11.942	14.330	19.107	23.884	28.661	33.438	38.215	42.991	47.768	57.322
61	4.856	7.285	9.713	12.141	14.569	19.425	24.282	29.138	33.995	38.851	43.707	48.564	58.276
62	4.936	7.404	9.872	12.340	14.808	19.744	24.680	29.615	34.551	39.487	44.423	49.359	59.231
63	5.015	7.523	10.031	12.539	15.046	20.062	25.077	30.093	35.108	40.124	45.139	50.155	60.186
64	5.095	7.643	10.190	12.738	15.285	20.380	25.475	30.570	35.665	40.760	45.855	50.950	61.140
65	5.175	7.762	10.349	12.936	15.524	20.698	25.873	31.047	36.222	41.396	46.571	51.746	62.095
66	5.254	7.881	10.508	13.135	15.762	21.016	26.270	31.525	36.779	42.033	47.287	52.541	63.049
67	5.334	8.000	10.667	13.334	16.001	21.335	26.668	32.002	37.336	42.669	48.003	53.336	64.004
68	5.413	8.120	10.826	13.533	16.240	21.653	27.066	32.479	37.892	43.306	48.719	54.132	64.958
69	5.493	8.239	10.985	13.732	16.478	21.971	27.464	32.956	38.449	43.942	49.435	54.927	65.913
70	5.572	8.358	11.145	13.931	16.717	22.289	27.861	33.434	39.006	44.578	50.151	55.723	66.868
71	5.652	8.478	11.304	14.130	16.956	22.607	28.259	33.911	39.563	45.215	50.867	56.518	67.822
72	5.731	8.597	11.463	14.328	17.194	22.926	28.657	34.388	40.120	45.851	51.583	57.314	68.777
73	5.811	8.716	11.622	14.527	17.433	23.244	29.055	34.866	40.677	46.488	52.299	58.109	69.731
74	5.891	8.836	11.781	14.726	17.672	23.562	29.453	35.343	41.234	47.124	53.015	58.905	70.686
75	5.970	8.955	11.940	14.925	17.910	23.880	29.850	35.820	41.790	47.760	53.731	59.701	71.641
76	6.050	9.074	12.099	15.124	18.149	24.198	30.248	36.298	42.347	48.397	54.446	60.496	72.595
77	6.129	9.194	12.258	15.323	18.387	24.517	30.646	36.775	42.904	49.033	55.162	61.292	73.550
78	6.209	9.313	12.417	15.522	18.626	24.835	31.044	37.252	43.461	49.670	55.878	62.087	74.505
79	6.288	9.432	12.577	15.721	18.865	25.153	31.441	37.730	44.018	50.306	56.594	62.883	75.459
80	6.368	9.552	12.736	15.920	19.104	25.471	31.839	38.207	44.575	50.943	57.311	63.678	76.414
81	6.447	9.671	12.895	16.118	19.342	25.790	32.237	38.684	45.132	51.579	58.027	64.474	77.369
82	6.527	9.790	13.054	16.317	19.581	26.108	32.635	39.162	45.689	52.216	58.743	65.269	78.323
83	6.607	9.910	13.213	16.516	19.820	26.426	33.033	39.639	46.246	52.852	59.459	66.065	79.278
84	6.686	10.029	13.372	16.715	20.058	26.744	33.430	40.116	46.802	53.489	60.175	66.861	80.233
85	6.766	10.148	13.531	16.914	20.297	27.063	33.828	40.594	47.359	54.125	60.891	67.656	81.188
86	6.845	10.268	13.690	17.113	20.536	27.381	34.226	41.071	47.916	54.761	61.607	68.452	82.142
87	6.925	10.387	13.849	17.312	20.774	27.699	34.624	41.548	48.473	55.398	62.323	69.247	83.097
88	7.004	10.506	14.009	17.511	21.013	28.017	35.022	42.026	49.030	56.034	63.039	70.043	84.052
89	7.084	10.626	14.168	17.710	21.252	28.335	35.419	42.503	49.587	56.671	63.755	70.839	85.006
90	7.163	10.745	14.327	17.909	21.490	28.654	35.817	42.981	50.144	57.307	64.471	71.634	85.961
91	7.243	10.864	14.486	18.107	21.729	28.972	36.215	43.458	50.701	57.944	65.187	72.430	86.916
92	7.323	10.984	14.645	18.306	21.968	29.290	36.613	43.935	51.258	58.580	65.903	73.226	87.871
93	7.402	11.103	14.804	18.505	22.206	29.608	37.011	44.413	51.815	59.217	66.619	74.021	88.825
94	7.482	11.223	14.963	18.704	22.445	29.927	37.408	44.890	52.372	59.853	67.335	74.817	89.780
95	7.561	11.342	15.122	18.903	22.684	30.245	37.806	45.367	52.929	60.490	68.051	75.612	90.735
96	7.641	11.461	15.282	19.102	22.922	30.563	38.204	45.845	53.486	61.126	68.767	76.408	91.690
97	7.720	11.581	15.441	19.301	23.161	30.881	38.602	46.322	54.043	61.763	69.483	77.204	92.644
98	7.800	11.700	15.600	19.500	23.400	31.200	39.000	46.800	54.599	62.399	70.199	77.999	93.599
99	7.879	11.819	15.759	19.699	23.638	31.518	39.397	47.277	55.156	63.036	70.915	78.795	94.554
100	7.959	11.939	15.918	19.898	23.877	31.836	39.795	47.754	55.713	63.672	71.632	79.591	95.509
101	8.039	12.058	16.077	20.097	24.116	32.154	40.193	48.232	56.270	64.309	72.348	80.386	96.463
102	8.118	12.177	16.236	20.295	24.355	32.473	40.591	48.709	56.827	64.945	73.064	81.182	97.418
103	8.198	12.297	16.396	20.494	24.593	32.791	40.989	49.187	57.384	65.582	73.780	81.978	98.373
104	8.277	12.416	16.555	20.693	24.832	33.109	41.387	49.664	57.941	66.219	74.496	82.773	99.328
105	8.357	12.535	16.714	20.892	25.071	33.428	41.784	50.141	58.498	66.855	75.212	83.569	100.283
106	8.436	12.655	16.873	21.091	25.309	33.746	42.182	50.619	59.055	67.492	75.928	84.364	101.237
107	8.516	12.774	17.032	21.290	25.548	34.064	42.580	51.096	59.612	68.128	76.644	85.160	102.192
108	8.596	12.893	17.191	21.489	25.787	34.382	42.978	51.573	60.169	68.765	77.360	85.956	103.147
109	8.675	13.013	17.350	21.688	26.025	34.701	43.376	52.051	60.726	69.401	78.076	86.751	104.102
110	8.755	13.132	17.509	21.887	26.264	35.019	43.774	52.528	61.283	70.038	78.792	87.547	105.057
111	8.834	13.251	17.669	22.086	26.503	35.337	44.171	53.006	61.840	70.674	79.509	88.343	106.011
112	8.914	13.371	17.828	22.285	26.742	35.655	44.569	53.483	62.397	71.311	80.225	89.138	106.966
113	8.993	13.490	17.987	22.484	26.980	35.974	44.967	53.960	62.954	71.947	80.941	89.934	107.921
114	9.073	13.609	18.146	22.682	27.219	36.292	45.365	54.438	63.511	72.584	81.657	90.730	108.876
115	9.153	13.729	18.305	22.881	27.458	36.610	45.763	54.915	64.068	73.220	82.373	91.525	109.831
116	9.232	13.848	18.464	23.080	27.696	36.928	46.161	55.393	64.625	73.857	83.089	92.321	110.785
117	9.312	13.968	18.623	23.279	27.935	37.247	46.558	55.870	65.182	74.493	83.805	93.117	111.740
118	9.391	14.087	18.783	23.478	28.174	37.565	46.956	56.348	65.739	75.130	84.521	93.913	112.695
119	9.471	14.206	18.942	23.677	28.412	37.883	47.354	56.825	66.296	75.767	85.237	94.708	113.650
120	9.550	14.326	19.101	23.876	28.651	38.202	47.752	57.302	66.853	76.403	85.953	95.504	114.605
121	9.630	14.445	19.260	24.075	28.890	38.520	48.150	57.780	67.410	77.040	86.670	96.300	115.559
122	9.710	14.564	19.419	24.274	29.129	38.838	48.548	58.257	67.967	77.676	87.386	97.095	116.514
123	9.789	14.684	19.578	24.473	29.367	39.156	48.945	58.735	68.524	78.313	88.102	97.891	117.469
124	9.869	14.803	19.737	24.672	29.606	39.475	49.343	59.212	69.081	78.949	88.818	98.687	118.424
125	9.948	14.922	19.896	24.871	29.845	39.793	49.741	59.689	69.638	79.586	89.534	99.482	119.379
126	10.028	15.042	20.056	25.070	30.083	40.111	50.139	60.167	70.195	80.222	90.250	100.278	120.334
127	10.107	15.161	20.215	25.268	30.322	40.429	50.537	60.644	70.752	80.859	90.966	101.074	121.288
128	10.187	15.280	20.374	25.467	30.561	40.748	50.935	61.122	71.309	81.496	91.682	101.869	122.243
129	10.267	15.400	20.533	25.666	30.800	41.066	51.333	61.599	71.866	82.132	92.399	102.665	123.198
130	10.346	15.519	20.692	25.865	31.038	41.384	51.730	62.076	72.423	82.769	93.115	103.461	124.153
131	10.426	15.638	20.851	26.064	31.277	41.703	52.128	62.554	72.980	83.405	93.831	104.256	125.108
132	10.505	15.758	21.010	26.263	31.516	42.021	52.526	63.031	73.537	84.042	94.547	105.052	126.063
133	10.585	15.877	21.170	26.462	31.754	42.339	52.924	63.509	74.094	84.678	95.263	105.848	127.017
134	10.664	15.997	21.329	26.661	31.993	42.657	53.322	63.986	74.651	85.315	95.979	106.644	127.972
135	10.744	16.116	21.488	26.860	32.232	42.976	53.720	64.464	75.207	85.951	96.695	107.439	128.927
136	10.823	16.235	21.647	27.059	32.470	43.294	54.117	64.941	75.764	86.588	97.411	108.235	129.882
137	10.903	16.355	21.806	27.258	32.709	43.612	54.515	65.418	76.321	87.225	98.128	109.031	130.837
138	10.983	16.474	21.965	27.457	32.948	43.931	54.913	65.896	76.878	87.861	98.844	109.826	131.792
139	11.062	16.593	22.124	27.656	33.187	44.249	55.311	66.373	77.435	88.498	99.560	110.622	132.747
140	11.142	16.713	22.284	27.854	33.425	44.567	55.709	66.851	77.992	89.134	100.276	111.418	133.701

What Are the Types of Sprockets? (Roller Chain Hub Styles)

The overwhelming majority of roller chain sprockets fall into several major styles: Roller chain sprocket, conveyor chain sprockets (Double Pitch type chains), and engineering class/Specialty Sprockets.

How Are Sprockets Measured?

Sprockets can be sized based on the following characteristics:

Outside Diameter (Most Common)
Pitch Diameter
Caliber Diameter
Length Thru Bore

Outside Diameter: “Max” Diameter of the sprocket measured edge of tooth to edge of tooth 180 degrees across.

Pitch Diameter: The pitch diameter is the theoretical circle measured from the center of one roller chain pin to the center of another roller chain pin 180 degrees across when the chain is wrapped around a sprocket.

Caliper Diameter: “Caliper diameter” is the measurement of the distance from the sprocket-tooth valley to the sprocket-tooth valley on the opposite side of the sprocket. This dimension measures the diameter of the sprocket plate not including sprocket teeth. On sprockets with an odd number of teeth, the measurement is taken from the valley of one tooth to the valley as close to 180° on the opposite side of the sprocket.

Length Thru Bore (LTB): The Length thru Bore or LTB is the distance measured from one face of the sprocket to the opposite face thru the center bore.

How to Identify My Sprocket

Chain Pitch
Hub Type
Number of teeth
Bore Size

Chain Pitch: All sprockets are designed for use with a specific chain. All chains are made to a given standard. The most common standard in the United States is ANSI. Chains are identified by what is called their “pitch,” which refers to the distance from one roller-pin center to the next roller-pin center of a given chain. Chain pitch is always measured in 1/8” increments for ANSI standard chains. The second most popular standard is British Standard Chain, in which chain pitch is measured in 1/16” roller-pin-center to roller-pin-center spacing increments.

Hub Type: All sprockets come in several different configurations to be affixed to a shaft. no hub (A-style); a hub projection from one side (B-style); hub projections from both sides of the sprocket (C-style); or sprocket hubs that accept bushings.

Hub Diameter: For “B” hub or “C” hub sprockets, the hub diameter is the overall diameter of the sprocket hub, Hub diameter is typically generic. However, it does determine/limit the “Maximum” finished bore and keyway size. Measuring the length thru bure (LTB) May also assist determining the hub type.

Sprocket Teeth: The sprocket Outside Diameter, Pitch Diameter, and Caliper diameter are all derived from the number of teeth. When the chain pitch is known, the most efficient and easiest method for identifying a sprocket size is to count the number of teeth.

Bore Size: PEER Chain provides a wide range of finished bore and plain bore sprockets. Finished Bore sprockets are machined to ANSI standard tolerances with one keyway aligned to the center of a sprocket tooth and with two set screws. One set screw is centered on the keyway and the other at 90 degrees.

If you still aren’t sure what type of sprocket you need, try to find the answers to the following questions before you begin your search.

What type of sprocket do you need?
Is your sprocket being used as a drive sprocket or idler sprocket?
What is the diameter of the sprocket you need to replace?
How many teeth are in your sprocket?
What size chain are you using?

At PEER Chain, you can navigate our broad selection of sprockets by filtering items by hub type and chain size. Browse through our wide selection of sprockets by specifying the chain size you need. From 25 to 240, we provide the chain sizes you need without any of the hassle. Our high-quality products will get the job done and leave you satisfied for years to come. We will work with you to ensure that you get exactly the roller chain sprocket or conveyor chain sprocket that will keep your business up and running. Sprockets are available for a variety of uses from forestry to machinery, and everything in between.

Should I Replace the Chain When I Replace Sprockets Using Sprocket Size Chart?

If you have worn chain, you should replace the sprocket(s) at the same time. Newly installed chain on worn out sprockets will significantly increase wear on the chain. By replacing all chain and sprockets in the system at the same time, you will prevent premature wear on the chain and sprockets and extend the life of your equipment to minimize company downtime. Count on the knowledgeable team at PEER Chain to make recommendations for the best and most cost-effective path forward.

At PEER Chain, we have been personally committed to pinpointing our customer’s best solution since 1969. We accomplish our goals because we deliver on our promises for product genius and over-the-top service. We are continually improving processes, products and services so that we consistently meet or exceed our customers' expectations and all other relevant requirements.

Ready to get your project back up and running quickly? Contact PEER Chain at 800-523-4567 or fill out our contact form. You can also drop us a message at [email protected], and we'll work with you to ensure that we provide you with the exact roller chain sprockets or conveyor chain sprockets that you need. You can even reach our Product Management Department at 847-775-4600 or via email to [email protected] to see our full capabilities for machining sprockets.

Sprocket Pitch Diameter Chart

	Pitch Diameter
Chain Size	25	35	40	50	60	80	100	120	140	160	180	200	240
# of Teeth	0.25	0.38	0.50	0.63	0.75	1.00	1.25	1.50	1.75	2.00	2.25	2.50	3.00
3	0.289	0.433	0.577	0.722	0.866	1.155	1.443	1.732	2.021	2.309	2.598	2.887	3.464
4	0.354	0.530	0.707	0.884	1.061	1.414	1.768	2.121	2.475	2.828	3.182	3.536	4.243
5	0.425	0.638	0.851	1.063	1.276	1.701	2.127	2.552	2.977	3.403	3.828	4.253	5.104
6	0.500	0.750	1.000	1.250	1.500	2.000	2.500	3.000	3.500	4.000	4.500	5.000	6.000
7	0.576	0.864	1.152	1.440	1.729	2.305	2.881	3.457	4.033	4.610	5.186	5.762	6.914

View Entire Chart

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Sprocket Size Chart