Extension Springs — In Stock & Ready to Ship

Lee Spring stocks wide selection of extension springs in standard and instrument series configurations available for immediate shipment. Our in-stock extension spring inventory includes music wire, Type 302 stainless steel, and Type 316 stainless steel options with various end loop configurations. Filter by outside diameter, wire diameter, free length, initial tension, and maximum load to find the exact specification you need easily. All stock extension springs include free standard ground shipping option and a Certificate of Compliance. Learn more about Extension Springs and How to Measure an Extension Spring.

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Part Number	Outside Diameter (cm)	Outside Diameter (inch) Sort descending	Outside Diameter (mm)	Wire Diameter (cm)	Wire Diameter (inch)	Wire Diameter (mm)	Max Load (gm)	Max Load (kg)	Max Load (lb)	Max Load (n)	Rate (gm/cm)	Rate (gm/mm)	Rate (kg/cm)	Rate (kg/mm)	Rate (lb/inch)	Rate (N/cm)	Rate (N/mm)	Max Extended Length (cm)	Max Extended Length (inch)	Max Extended Length (mm)	Initial Tension (gm)	Initial Tension (kg)	Initial Tension (lb)	Initial Tension (N)	Free Length (cm)	Free Length (inch)	Free Length (mm)	Material
EIM020A 05 S	0.201	0.079	2.01	0.02	0.008	0.2	145.2	0.1452	0.32	1.423	32	3.2	0.032	0.0032	0.18	0.32	0.032	6.175	2.431	61.75	11.3	0.0113	0.025	0.111	1.999	0.787	19.99	SS
EIM020A 05 M	0.201	0.079	2.01	0.02	0.008	0.2	173.3	0.1733	0.382	1.699	38	3.8	0.038	0.0038	0.215	0.38	0.038	6.144	2.419	61.44	13.6	0.0136	0.03	0.133	1.999	0.787	19.99	MW
EIM020A 04 S	0.201	0.079	2.01	0.02	0.008	0.2	145.2	0.1452	0.32	1.423	38	3.8	0.038	0.0038	0.212	0.37	0.037	5.281	2.079	52.81	11.3	0.0113	0.025	0.111	1.75	0.689	17.5	SS
EIM020A 04 M	0.201	0.079	2.01	0.02	0.008	0.2	173.3	0.1733	0.382	1.699	46	4.6	0.046	0.0046	0.255	0.45	0.045	5.255	2.069	52.55	13.6	0.0136	0.03	0.133	1.75	0.689	17.5	MW
EIM020A 03 S	0.201	0.079	2.01	0.02	0.008	0.2	145.2	0.1452	0.32	1.423	46	4.6	0.046	0.0046	0.26	0.46	0.046	4.387	1.727	43.87	11.3	0.0113	0.025	0.111	1.501	0.591	15.01	SS
EIM020A 03 M	0.201	0.079	2.01	0.02	0.008	0.2	173.3	0.1733	0.382	1.699	56	5.6	0.056	0.0056	0.312	0.55	0.055	4.364	1.718	43.64	13.6	0.0136	0.03	0.133	1.501	0.591	15.01	MW
EIM020A 02 S	0.201	0.079	2.01	0.02	0.008	0.2	145.2	0.1452	0.32	1.423	60	6	0.06	0.006	0.335	0.59	0.059	3.49	1.374	34.9	11.3	0.0113	0.025	0.111	1.25	0.492	12.5	SS
EIM020A 02 M	0.201	0.079	2.01	0.02	0.008	0.2	173.3	0.1733	0.382	1.699	72	7.2	0.072	0.0072	0.401	0.7	0.07	3.475	1.368	34.75	13.6	0.0136	0.03	0.133	1.25	0.492	12.5	MW
EIM020A 01 S	0.201	0.079	2.01	0.02	0.008	0.2	145.2	0.1452	0.32	1.423	84	8.4	0.084	0.0084	0.47	0.82	0.082	2.596	1.022	25.96	11.3	0.0113	0.025	0.111	1.001	0.394	10.01	SS
EIM025A 05 M	0.201	0.079	2.01	0.025	0.01	0.25	343.4	0.3434	0.757	3.367	128	12.8	0.128	0.0128	0.714	1.25	0.125	4.478	1.763	44.78	27.2	0.0272	0.06	0.267	1.999	0.787	19.99	MW
EIM025A 07 S	0.201	0.079	2.01	0.025	0.01	0.25	288	0.288	0.635	2.825	81	8.1	0.081	0.0081	0.455	0.8	0.08	5.768	2.271	57.68	22.7	0.0227	0.05	0.222	2.499	0.984	24.99	SS
EIM025A 07 M	0.201	0.079	2.01	0.025	0.01	0.25	343.4	0.3434	0.757	3.367	98	9.8	0.098	0.0098	0.546	0.96	0.096	5.743	2.261	57.43	27.2	0.0272	0.06	0.267	2.499	0.984	24.99	MW
EIM025A 06 S	0.201	0.079	2.01	0.025	0.01	0.25	288	0.288	0.635	2.825	92	9.2	0.092	0.0092	0.516	0.9	0.09	5.133	2.021	51.33	22.7	0.0227	0.05	0.222	2.25	0.886	22.5	SS
EIM025A 05 S	0.201	0.079	2.01	0.025	0.01	0.25	288	0.288	0.635	2.825	106	10.6	0.106	0.0106	0.595	1.04	0.104	4.498	1.771	44.98	22.7	0.0227	0.05	0.222	1.999	0.787	19.99	SS
EIM025A 06 M	0.201	0.079	2.01	0.025	0.01	0.25	343.4	0.3434	0.757	3.367	111	11.1	0.111	0.0111	0.619	1.08	0.108	5.11	2.012	51.1	27.2	0.0272	0.06	0.267	2.25	0.886	22.5	MW
EI 013B 06 M	0.239	0.094	2.39	0.033	0.013	0.33	567	0.567	1.25	5.56	268	26.8	0.268	0.0268	1.5	2.63	0.263	4.128	1.625	41.28	59	0.059	0.13	0.578	2.223	0.875	22.23	MW
EI 013B 06 S	0.239	0.094	2.39	0.033	0.013	0.33	472.3	0.4723	1.0412	4.631	223	22.3	0.223	0.0223	1.25	2.19	0.219	4.128	1.625	41.28	49.1	0.0491	0.1082	0.481	2.223	0.875	22.23	SS
EI 013B 07 M	0.239	0.094	2.39	0.033	0.013	0.33	567	0.567	1.25	5.56	227	22.7	0.227	0.0227	1.27	2.22	0.222	4.775	1.88	47.75	59	0.059	0.13	0.578	2.54	1	25.4	MW
EI 013B 07 S	0.239	0.094	2.39	0.033	0.013	0.33	472.3	0.4723	1.0412	4.631	189	18.9	0.189	0.0189	1.06	1.86	0.186	4.775	1.88	47.75	49.1	0.0491	0.1082	0.481	2.54	1	25.4	SS
EI 014B 01 M	0.239	0.094	2.39	0.036	0.014	0.36	680.4	0.6804	1.5	6.672	1268	126.8	1.268	0.1268	7.1	12.43	1.243	1.435	0.565	14.35	77.1	0.0771	0.17	0.756	0.953	0.375	9.53	MW