Lo-inch   is the free length of the spring (unloaded)
Di-inch   is the inside diameter , every spring on this page is 2.50 inches inside diameter.
C-lbs./inch   is the actual spring rate, expressed in pounds per linear inch.
Sc-inch   is how many inches the spring can be compressed before it coil binds.
Fc-lbs is how many pounds of force it takes to compress the spring until it coil binds.
WT-lbs is actually how much the spring weighs, and has nothing to do with the stiffness.

Part Number	Lo-inch	Di-inch	C-lbs/inch	Sc-inch	Fc-lbs	WT-lbs
0600.250.0450	6.00	2.50	450	3.51	1579	2.12
0600.250.0500	6.00	2.50	500	3.50	1749	2.18
0600.250.0550	6.00	2.50	550	3.49	1918	2.25
0600.250.0600	6.00	2.50	600	3.43	2060	2.35
0600.250.0650	6.00	2.50	650	3.43	2226	2.42
0600.250.0700	6.00	2.50	700	3.17	2219	2.79
0600.250.0750	6.00	2.50	750	3.27	2451	2.69
0600.250.0800	6.00	2.50	800	3.21	2571	2.81
0600.250.0850	6.00	2.50	850	3.16	2686	2.93
0600.250.0900	6.00	2.50	900	3.10	2794	3.05
0600.250.0950	6.00	2.50	950	3.00	2847	3.24
0600.250.1000	6.00	2.50	1000	2.94	2941	3.37
0600.250.1050	6.00	2.50	1050	3.05	3202	3.25
0600.250.1100	6.00	2.50	1100	2.94	3235	3.44
0600.250.1150	6.00	2.50	1150	2.83	3255	3.64
0600.250.1200	6.00	2.50	1200	2.94	3531	3.51
0600.250.1250	6.00	2.50	1250	2.83	3539	3.71
0600.250.1300	6.00	2.50	1300	2.72	3535	3.93
0600.250.1350	6.00	2.50	1350	2.84	3827	3.78
0600.250.1400	6.00	2.50	1400	2.72	3811	4.00
0600.250.1450	6.00	2.50	1450	2.61	3781	4.23
0700.250.0275	7.00	2.50	275	4.46	1227	1.95
0700.250.0300	7.00	2.50	300	4.40	1319	2.06
0700.250.0325	7.00	2.50	325	4.33	1409	2.17
0700.250.0350	7.00	2.50	350	4.24	1483	2.31
0700.250.0375	7.00	2.50	375	4.12	1545	2.47
0700.250.0400	7.00	2.50	400	4.29	1717	2.32
0700.250.0450	7.00	2.50	450	4.09	1839	2.63
0700.250.0500	7.00	2.50	500	4.06	2031	2.71
0700.250.0550	7.00	2.50	550	3.84	2113	3.07
0700.250.0600	7.00	2.50	600	3.78	2266	3.21
0700.250.0650	7.00	2.50	650	3.77	2451	3.31
0800.250.0150	8.00	2.50	150	5.57	836	1.61
0800.250.0175	8.00	2.50	175	5.32	932	1.90
0800.250.0200	8.00	2.50	200	5.33	1065	1.95
0800.250.0225	8.00	2.50	225	5.29	1191	2.03
0800.250.0250	8.00	2.50	250	4.99	1248	2.39
0800.250.0275	8.00	2.50	275	4.92	1353	2.52
0800.250.0300	8.00	2.50	300	4.89	1467	2.61
0800.250.0325	8.00	2.50	325	4.82	1566	2.74
0800.250.0350	8.00	2.50	350	4.70	1645	2.92
0800.250.0375	8.00	2.50	375	4.88	1829	2.76
0800.250.0400	8.00	2.50	400	4.76	1905	2.93
0800.250.0425	8.00	2.50	425	4.69	1994	3.07
0800.250.0450	8.00	2.50	450	4.57	2059	3.26
0800.250.0475	8.00	2.50	475	4.41	2093	3.51
0800.250.0500	8.00	2.50	500	4.55