Metal Bellows Correctedn 7/11/00 6:40 PM Page 73
TORSIONAL STIFFNESS VALUES 750MM TO 3600MM SIZE
VALUES ARE BASED ON:
1. Standard Convolution Height and Pitch
2. T-304 S/S Bellows Material
3. 800˚F Maximum Operating Condition
4. Data is Based Upon Single Bellows With Stated Convolution
Counts Only
SPRING RATES BELOW RESIST BELLOWS
MOVEMENT FOR TORSIONALLY APPLIED
MOMENT M
METRIC
** Torsional Spring Rate (Kg - M) X 10
3
for catalog parts
† Maximum Allowable Torsion Angle in Degrees
Nom.
3.5 Kg/Cm
2
10.5 Kg/Cm
2
21. Kg/Cm
2
Nom.
3.5 Kg/Cm
2 Nom.
1.8 Kg/Cm
2 Nom.
Dia. Dia. Dia.
# of Cons
1.8 Kg/Cm
2
Dia.
# of Cons
(In.)
# of Cons **
†
**
†
**
†
(In.)
# of Cons **
†
(In.) **
† (In.)
**
†
750 4 95.6 0.019 167 0.022 346 0.021 1100 4 295 0.014 1500 2 1435 0.008 2700 2 8369 0.005
8 47.8 0.039 83.6 0.044 173 0.043 8 148 0.027 4 718 0.017 4 4185 0.009
12 31.9 0.058 55.7 0.067 115 0.064 12 98.5 0.041 6 478 0.025 6 2790 0.014
16 23.9 0.078 41.8 0.089 87 0.086 16 73.9 0.054 8 359 0.033 8 2092 0.018
800 4 116 0.018 199 0.021 412 0.02 1150 4 338 0.013 10 287 0.041 10 1674 0.023
8 58 0.036 99.6 0.042 206 0.041 8 169 0.026 12 239 0.05 12 1395 0.028
12 38.7 0.055 66.4 0.064 137 0.061 12 113 0.039 1650 2 1910 0.008 3000 2 11480 0.004
16 29 0.073 49.8 0.085 103 0.082 16 84.4 0.052 4 955 0.015 4 5740 0.008
850 4 136 0.017 239 0.02 486 0.02 1200 4 384 0.012 6 637 0.023 6 3827 0.012
8 68.2 0.035 120 0.04 243 0.039 8 192 0.025 8 478 0.03 8 2870 0.017
12 45.4 0.052 79.7 0.06 162 0.059 12 128 0.037 10 382 0.038 10 2296 0.021
16 34.1 0.07 59.8 0.08 121 0.079 16 95.9 0.05 12 318 0.045 12 1913 0.025
900 4 162 0.017 284 0.019 577 0.019 1250 2 830 0.01 1800 2 2480 0.007 3300 2 15280 0.004
8 80.9 0.033 142 0.038 288 0.037 4 415 0.02 4 1240 0.014 4 7640 0.008
12 53.9 0.05 94.6 0.057 192 0.056 6 277 0.03 6 827 0.021 6 5093 0.011
16 40.5 0.066 70.9 0.075 144 0.074 8 208 0.04 8 620 0.028 8 3820 0.015
950 4 190 0.016 334 0.018 678 0.018 10 166 0.05 10 496 0.035 10 3056 0.019
8 95.2 0.031 167 0.036 339 0.035 12 138 0.06 12 413 0.041 12 2547 0.023
12 63.4 0.047 111 0.054 226 0.053 1300 2 934 0.01 2100 2 3938 0.006 3600 2 19838 0.003
16 47.6 0.063 83.4 0.071 170 0.07 4 467 0.019 4 1969 0.012 4 9919 0.007
1000 4 222 0.015 389 0.017 791 0.017 6 311 0.029 6 1313 0.018 6 6613 0.01
8 111 0.03 195 0.034 396 0.033 8 234 0.038 8 984 0.024 8 4960 0.014
12 74 0.045 130 0.051 264 0.05 10 187 0.048 10 788 0.03 10 3968 0.017
16 55.5 0.059 97.3 0.068 198 0.067 12 156 0.057 12 656 0.035 12 3306 0.021
1050 4 257 0.014 451 0.016 916 0.016 1350 2 1046 0.009 2400 2 5878 0.005
8 128 0.028 225 0.032 458 0.032 4 523 0.018 4 2939 0.01
12 85.7 0.042 150 0.048 305 0.048 6 349 0.028 6 1959 0.016
16 64.2 0.057 113 0.065 229 0.064 8 262 0.037 8 1469 0.021
10 209 0.046 10 1176 0.026
12 174 0.055 12 980 0.031
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