Medium Duty – Standard Inch Series

(White with Blue Stripe)

Efficient Operating Range is 25% to 50% deflection of free length. Maximum deflection is 50%; Long Life deflection is 40%; Optimum Life deflection is 25%. Deflection beyond this Efficient Operating Range could result in premature spring failure. Travel to Solid is a reference dimension only and should never be approached during use.

			50% Deflection		40% Deflection		25% Deflection		Travel to Solid
Part#	Free Length (In)	Free Length (mm)	Load (lbs)	Deflection Length	Load (lbs)	Deflection Length)	Load (lbs)	Deflection Length	Load (lbs)	Deflection Length	Load @ .1″ Deflection (lbs)	Hole Dia.	Rod Dia.
M37-100	1	25.4	37	0.500	29	0.400	18	0.250	42	0.572	7.3	3/8	3/16
M37-125	1.25	31.8	41	0.625	33	0.500	20	0.313	47	0.725	6.5	3/8	3/16
M37-150	1.5	38.1	38	0.750	30	0.600	19	0.375	45	0.896	5.0	3/8	3/16
M37-175	1.75	44.5	37	0.875	29	0.700	18	0.438	46	1.088	4.2	3/8	3/16
M37-200	2	50.8	38	1.000	30	0.800	19	0.500	44	1.163	3.8	3/8	3/16
M37-250	2.5	63.5	38	1.250	30	1.000	19	0.625	47	1.552	3.0	3/8	3/16
M37-300	3	76.2	30	1.500	24	1.200	15	0.750	36	1.821	2.0	3/8	3/16
M37-1200	12	304.8	42	6.000	34	4.800	21	3.000	55	7.800	0.7	3/8	3/16
M50-100	1	25.4	55	0.500	44	0.400	28	0.250	59	0.536	11.0	1/2	9/32
M50-125	1.25	31.8	55	0.625	44	0.500	28	0.313	63	0.719	8.8	1/2	9/32
M50-150	1.5	38.1	59	0.750	47	0.600	29	0.375	65	0.831	7.8	1/2	9/32
M50-175	1.75	44.5	51	0.875	41	0.700	25	0.438	56	0.972	5.8	1/2	9/32
M50-200	2	50.8	52	1.000	42	0.800	26	0.500	57	1.091	5.2	1/2	9/32
M50-250	2.5	63.5	63	1.250	50	1.000	31	0.625	73	1.464	5.0	1/2	9/32
M50-300	3	76.2	53	1.500	42	1.200	26	0.750	65	1.850	3.5	1/2	9/32
M50-350	3.5	88.9	56	1.750	45	1.400	28	0.875	70	2.190	3.2	1/2	9/32
M50-450	4.5	114.3	56	2.250	45	1.800	28	1.125	68	2.736	2.5	1/2	9/32
M50-550	5.5	139.7	58	2.750	46	2.200	29	1.375	72	3.436	2.1	1/2	9/32
M50-650	6.5	165.1	49	3.250	39	2.600	24	1.625	57	3.787	1.5	1/2	9/32
M50-750	7.5	190.5	45	3.750	36	3.000	23	1.875	49	4.075	1.2	1/2	9/32
M50-1200	12	304.8	48	6.000	38	4.800	24	3.000	50	6.215	0.8	1/2	9/32
M62-100	1	25.4	95	0.500	76	0.400	48	0.250	100	0.528	19.0	5/8	11/32
M62-125	1.25	31.8	89	0.625	72	0.500	45	0.313	95	0.665	14.3	5/8	11/32
M62-150	1.5	38.1	98	0.750	78	0.600	49	0.375	111	0.850	13.0	5/8	11/32
M62-175	1.75	44.5	86	0.875	69	0.700	43	0.438	96	0.982	9.8	5/8	11/32
M62-200	2	50.8	102	1.000	82	0.800	51	0.500	115	1.126	10.2	5/8	11/32
M62-250	2.5	63.5	91	1.250	73	1.000	46	0.625	108	1.476	7.3	5/8	11/32
M62-300	3	76.2	99	1.500	79	1.200	50	0.750	122	1.842	6.6	5/8	11/32
M62-350	3.5	88.9	88	1.750	70	1.400	44	0.875	111	2.229	5.0	5/8	11/32
M62-400	4	101.6	92	2.000	74	1.600	46	1.000	119	2.577	4.6	5/8	11/32
M62-1200	12	304.8	96	6.000	77	4.800	48	3.000	122	7.609	1.6	5/8	11/32
M75-100	1	25.4	188	0.500	150	0.400	94	0.250	194	0.516	37.6	3/4	3/8
M75-125	1.25	31.8	179	0.625	144	0.500	90	0.313	191	0.665	28.7	3/4	3/8
M75-150	1.5	38.1	167	0.750	133	0.600	83	0.375	175	0.788	22.2	3/4	3/8
M75-175	1.75	44.5	162	0.875	130	0.700	81	0.438	173	0.934	18.5	3/4	3/8
M75-200	2	50.8	161	1.000	129	0.800	81	0.500	174	1.081	16.1	3/4	3/8
M75-250	2.5	63.5	159	1.250	127	1.000	79	0.625	174	1.374	12.7	3/4	3/8
M75-300	3	76.2	158	1.500	126	1.200	79	0.750	175	1.667	10.5	3/4	3/8
M75-350	3.5	88.9	156	1.750	125	1.400	78	0.875	175	1.961	8.9	3/4	3/8
M75-400	4	101.6	154	2.000	123	1.600	77	1.000	174	2.254	7.7	3/4	3/8
M75-450	4.5	114.3	155	2.250	124	1.800	78	1.125	176	2.547	6.9	3/4	3/8
M75-500	5	127	153	2.500	122	2.000	76	1.250	173	2.841	6.1	3/4	3/8
M75-550	5.5	139.7	154	2.750	123	2.200	77	1.375	176	3.134	5.6	3/4	3/8
M75-600	6	152.4	153	3.000	122	2.400	77	1.500	175	3.426	5.1	3/4	3/8
M75-650	6.5	165.1	153	3.250	122	2.600	76	1.625	175	3.720	4.7	3/4	3/8
M75-750	7.5	190.5	154	3.750	123	3.000	77	1.875	177	4.306	4.1	3/4	3/8
M75-1200	12	304.8	150	6.000	120	4.800	75	3.000	174	6.945	2.5	3/4	3/8
M100-100	1	25.4	290	0.500	232	0.400	145	0.250	295	0.509	58.0	1	1/2
M100-125	1.25	31.8	330	0.625	264	0.500	165	0.313	350	0.663	52.8	1	1/2
M100-150	1.5	38.1	301	0.750	241	0.600	150	0.375	318	0.792	40.1	1	1/2
M100-175	1.75	44.5	294	0.875	235	0.700	147	0.438	317	0.944	33.6	1	1/2
M100-200	2	50.8	289	1.000	231	0.800	145	0.500	317	1.097	28.9	1	1/2
M100-250	2.5	63.5	283	1.250	226	1.000	141	0.625	317	1.403	22.6	1	1/2
M100-300	3	76.2	279	1.500	223	1.200	140	0.750	318	1.709	18.6	1	1/2
M100-350	3.5	88.9	277	1.750	221	1.400	138	0.875	318	2.014	15.8	1	1/2
M100-400	4	101.6	274	2.000	219	1.600	137	1.000	318	2.320	13.7	1	1/2
M100-450	4.5	114.3	272	2.250	218	1.800	136	1.125	318	2.625	12.1	1	1/2
M100-500	5	127	270	2.500	216	2.000	135	1.250	317	2.931	10.8	1	1/2
M100-550	5.5	139.7	270	2.750	216	2.200	135	1.375	317	3.236	9.8	1	1/2
M100-600	6	152.4	270	3.000	216	2.400	135	1.500	319	3.542	9.0	1	1/2
M100-700	7	177.8	266	3.500	213	2.800	133	1.750	316	4.154	7.6	1	1/2
M100-800	8	203.2	268	4.000	214	3.200	134	2.000	319	4.764	6.7	1	1/2
M100-1200	12	304.8	264	6.000	211	4.800	132	3.000	317	7.21	4.4	1	1/2
M125-150	1.5	38.1	389	0.750	311	0.600	194	0.375	410	0.792	51.8	1-1/4	5/8
M125-175	1.75	44.5	350	0.875	280	0.700	175	0.438	374	0.935	40.0	1-1/4	5/8
M125-200	2	50.8	357	1.000	286	0.800	179	0.500	413	1.156	35.7	1-1/4	5/8
M125-250	2.5	63.5	391	1.250	313	1.000	196	0.625	464	1.481	31.3	1-1/4	5/8
M125-300	3	76.2	383	1.500	306	1.200	191	0.750	460	1.804	25.5	1-1/4	5/8
M125-350	3.5	88.9	378	1.750	302	1.400	189	0.875	460	2.131	21.6	1-1/4	5/8
M125-400	4	101.6	374	2.000	299	1.600	187	1.000	459	2.457	18.7	1-1/4	5/8
M125-450	4.5	114.3	371	2.250	297	1.800	186	1.125	459	2.784	16.5	1-1/4	5/8
M125-500	5	127	370	2.500	296	2.000	185	1.250	461	3.112	14.8	1-1/4	5/8
M125-550	5.5	139.7	369	2.750	295	2.200	184	1.375	460	3.435	13.4	1-1/4	5/8
M125-600	6	152.4	366	3.000	293	2.400	183	1.500	458	3.758	12.2	1-1/4	5/8
M125-700	7	177.8	364	3.500	291	2.800	182	1.750	459	4.418	10.4	1-1/4	5/8
M125-800	8	203.2	364	4.000	291	3.200	182	2.000	461	5.068	9.1	1-1/4	5/8
M125-1000	10	254	360	5.000	288	4.000	180	2.500	459	6.375	7.2	1-1/4	5/8
M125-1200	12	304.8	360	6.000	288	4.800	180	3.000	461	7.681	6.0	1-1/4	5/8
M150-200	2	50.8	450	1.000	360	0.800	225	0.500	504	1.120	45.0	1-1/2	3/4
M150-250	2.5	63.5	525	1.250	420	1.000	263	0.625	572	1.361	42.0	1-1/2	3/4
M150-300	3	76.2	519	1.500	415	1.200	260	0.750	603	1.744	34.6	1-1/2	3/4
M150-350	3.5	88.9	520	1.750	416	1.400	260	0.875	584	1.966	29.7	1-1/2	3/4
M150-400	4	101.6	532	2.000	426	1.600	266	1.000	624	2.344	26.6	1-1/2	3/4
M150-450	4.5	114.3	513	2.250	410	1.800	257	1.125	592	2.595	22.8	1-1/2	3/4
M150-500	5	127	500	2.500	400	2.000	250	1.250	592	2.960	20.0	1-1/2	3/4
M150-550	5.5	139.7	506	2.750	405	2.200	253	1.375	589	3.203	18.4	1-1/2	3/4
M150-600	6	152.4	480	3.000	384	2.400	240	1.500	569	3.554	16.0	1-1/2	3/4
M150-700	7	177.8	497	3.500	398	2.800	249	1.750	591	4.162	14.2	1-1/2	3/4
M150-800	8	203.2	516	4.000	413	3.200	258	2.000	626	4.856	12.9	1-1/2	3/4
M150-1000	10	254	500	5.000	400	4.000	250	2.500	609	6.094	10.0	1-1/2	3/4
M150-1200	12	304.8	492	6.000	394	4.800	246	3.000	588	7.172	8.2	1-1/2	3/4
M200-250	2.5	63.5	1216	1.250	973	1.000	608	0.625	1245	1.280	97.3	2	1
M200-300	3	76.2	1140	1.500	912	1.200	570	0.750	1178	1.55	76.0	2	1
M200-350	3.5	88.9	1138	1.750	910	1.400	569	0.875	1192	1.834	65.0	2	1
M200-400	4	101.6	1128	2.000	902	1.600	564	1.000	1199	2.125	56.4	2	1
M200-450	4.5	114.3	1105	2.250	884	1.800	552	1.125	1157	2.356	49.1	2	1
M200-500	5	127	1095	2.500	876	2.000	548	1.250	1202	2.745	43.8	2	1
M200-550	5.5	139.7	1108	2.750	887	2.200	554	1.375	1198	2.972	40.3	2	1
M200-600	6	152.4	1116	3.000	893	2.400	558	1.500	1221	3.282	37.2	2	1
M200-700	7	177.8	1071	3.500	857	2.800	536	1.750	1165	3.806	30.6	2	1
M200-800	8	203.2	1072	4.000	858	3.200	536	2.000	1190	4.439	26.8	2	1
M200-1000	10	254	1050	5.000	840	4.000	525	2.500	1231	5.860	21.0	2	1
M200-1200	12	304.8	990	6.000	792	4.800	495	3.000	1118	6.775	16.5	2	1