Compressed Length / Free Length Conversion Chart
for Raymond ISO Die Springs

Free
Length		 Light Duty
Deflection		 Medium Duty
Deflection		 Heavy Duty
Deflection		 Extra-Heavy
Duty Deflection
25% 35% 40% 20% 25% 30% 15% 20% 25% 15% 17% 20%
25 18.8 17.5 16.3 20.0 18.8 17.5 21.3 20.0 18.8 21.3 20.8 20.0
32 24.0 22.4 20.8 25.6 24.0 22.4 27.2 25.6 24.0 27.2 26.6 25.6
38 28.5 26.6 24.7 30.4 28.5 26.6 32.3 30.4 28.5 32.3 31.5 30.4
44 33.0 30.8 28.6 35.2 33.0 30.8 37.4 35.2 33.0 37.4 36.5 35.2
51 38.3 35.7 33.2 40.8 38.3 35.7 43.4 40.8 38.3 43.4 42.3 40.8
64 48.0 44.8 41.6 51.2 48.0 44.8 54.4 51.2 48.0 54.4 53.1 51.2
76 57.0 53.2 49.4 60.8 57.0 53.2 64.6 60.8 57.0 64.6 63.1 60.8
89 66.8 62.3 57.9 71.2 66.8 62.3 75.7 71.2 66.8 75.7 73.9 71.2
102 76.5 71.4 66.3 81.6 76.5 71.4 86.7 81.6 76.5 86.7 84.7 81.6
115 86.3 80.5 74.8 92.0 86.3 80.5 97.8 92.0 86.3 97.8 95.5 92.0
127 95.3 88.9 82.6 101.6 95.3 88.9 108.0 101.6 95.3 108.0 105.4 101.6
139 104.3 97.3 90.4 111.2 104.3 97.3 118.2 111.2 104.3 118.2 115.4 111.2
152 114.0 106.4 98.8 121.6 114.0 106.4 129.2 121.6 114.0 129.2 126.2 121.6
178 133.5 124.6 115.7 142.4 133.5 124.6 151.3 142.4 133.5 151.3 147.7 142.4
203 152.3 142.1 132.0 162.4 152.3 142.1 172.6 162.4 152.3 172.6 168.5 162.4
254 190.5 177.8 165.1 203.2 190.5 177.8 215.9 203.2 190.5 215.9 210.8 203.2
305 228.8 213.5 198.3 244.0 228.8 213.5 259.3 244.0 228.8 259.3 253.2 244.0