Locking Assemblies RfN 7012 for Bending Loads | RINGFEDER®

The bending moment acting on the hub/shaft connection is the main load to evaluate in a belt drum or similar application. Excessive bending moments can cause overstress in the webs between the screw holes in the locking assembly. In the case of additional loads (bending moments/ radial loads) screw tightening torques may have to be reduced. To limit the influence of the bending load on the locking assembly connection we use the following criteria during the belt drum design process:

- Shaft deflection from the bending moments can only have a maximum deflection fm < 1/2000 * L (bearing centre distance).
- For the permissible bending load values please refer to our tables.

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Technical Data & CAD Models

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CAD
d
mm
D
mm
L
mm
L1
mm
TAred
Nm
T
Nm
pW
N/mm2
pN
N/mm2
Mbmax
Nm
pWmax bei Mbmax
N/mm2
pNmax bei Mbmax
N/mm2
Tres bei Mbmax
Nm
50 80 33,5 24 35 1777 189 118 1750 314 196 309
55 85 33,5 24 35 2267 199 129 1137 273 176 1961
60 90 33,5 24 35 2460 181 121 1900 294 196 1563
65 95 33,5 24 35 3030 190 130 1300 262 179 2737
70 110 39,5 28 70 4581 207 132 3150 324 206 3326
75 115 39,5 28 70 4887 192 125 3150 301 197 3736
80 120 39,5 28 70 5192 179 120 4225 317 211 3018
85 125 39,5 28 70 6281 192 131 2875 280 191 5584
90 130 39,5 28 70 6627 182 125 3925 294 204 5340
95 135 39,5 28 70 7843 192 135 2577 263 185 7408
100 145 47 33 125 9591 196 135 7210 331 228 6325
110 155 47 33 125 10488 177 126 7840 311 221 6966
120 165 47 33 125 13004 184 134 8960 325 236 9425
130 180 52 38 125 17522 162 117 11310 285 206 13383
140 190 52 38 125 20661 164 121 10160 268 197 17991
150 200 52 38 125 24046 167 125 9020 252 189 22290
160 210 52 38 125 27674 169 129 7870 239 182 26532
170 225 60 44 190 32486 157 119 21570 291 220 24292
180 235 60 44 190 37391 161 123 18960 273 209 32227
190 250 68 52 190 45890 147 111 24070 242 184 39071
200 260 68 52 190 51590 149 114 21150 228 176 47056
220 285 74 56 295 66374 146 112 32670 242 187 57777
240 305 74 56 295 83094 153 120 20330 208 164 80569
260 325 74 56 295 101512 159 127 16810 201 161 100111
280 355 86,5 66 405 124233 140 111 38440 204 161 118136
300 375 86,5 66 405 149101 146 117 24820 185 148 147020
320 405 100,5 78 580 207104 149 118 37220 188 148 203732
340 425 100,5 78 580 219216 140 112 57920 196 157 211426
360 455 116 90 780 282418 138 109 74630 189 150 272379
380 475 116 90 780 297102 130 104 87000 187 150 284078
400 495 116 90 780 311738 123 99 150460 217 175 273024
420 515 116 90 780 362587 130 106 93580 186 151 350303
440 545 130 102 1000 442836 126 102 113140 176 142 428139
460 565 130 102 1000 461680 121 98 177330 195 159 426266
480 585 130 102 1000 504497 121 99 168140 189 155 475653
500 605 130 102 1000 549139 121 100 158960 183 151 525629
520 630 130 102 1000 582655 119 98 194480 192 158 549239
540 650 130 102 1000 603639 114 95 258670 207 172 545408
560 670 130 102 1000 666213 117 98 212800 191 160 631313
580 690 130 102 1000 717182 118 99 203610 186 156 687672
600 710 130 102 1000 740342 114 96 267800 200 169 690210
620 730 130 102 1000 793992 114 97 258610 195 166 750696
640 750 130 102 1000 849441 115 98 249429 190 162 811994
660 770 130 102 1000 906684 115 99 240240 186 159 874277
680 790 130 102 1000 932418 111 96 304420 198 171 881324
700 810 130 102 1000 1026541 116 100 221870 177 153 1002277
720 830 130 102 1000 1054013 112 97 286050 189 164 1014455
740 850 130 102 1000 1117486 113 98 276870 185 161 1082644
760 870 130 102 1000 1182737 113 99 267680 182 159 1152048
780 890 130 102 1000 1230829 112 98 295180 185 162 1194909
800 910 130 102 1000 1279783 111 97 322680 189 166 1238436
820 930 130 102 1000 1349444 111 98 313500 185 163 1312524
840 950 130 102 1000 1420874 111 98 304310 182 161 1387904
860 970 130 102 1000 1494068 112 99 295130 178 158 1464629
880 990 130 102 1000 1569025 112 100 285940 175 156 1542750
900 1010 130 102 1000 1624087 111 99 313440 178 159 1593554
920 1030 130 102 1000 1680004 110 98 340940 182 162 1645045
940 1050 130 102 1000 1759331 110 99 331750 179 160 1727770
960 1070 130 102 1000 1840411 110 99 322570 176 158 1811922
980 1090 130 102 1000 1899788 109 98 350070 179 161 1867256
1000 1110 130 102 1000 1960015 108 98 377570 182 164 1923305
CAD d
inch 		D
inch 		L
inch 		L1
inch 		TAred
ft-lbs 		T
ft-lbs 		pW
psi 		pN
psi 		Mbmax
ft-lbs 		pWmax bei Mbmax
psi 		pNmax bei Mbmax
psi 		Tres bei Mbmax
ft-lbs
  1.969 3.150 1.319 0.945 26 1311 27432 17127 1291 45576 28448 228
  2.165 3.346 1.319 0.945 26 1672 28884 18724 839 39625 25546 1446
  2.362 3.543 1.319 0.945 26 1814 26271 17563 1401 42673 28448 1153
  2.559 3.740 1.319 0.945 26 2235 27578 18869 959 38028 25981 2019
  2.756 4.331 1.555 1.102 52 3379 30045 19159 2323 47027 29900 2453
  2.953 4.528 1.555 1.102 52 3605 27868 18143 2323 43689 28594 2756
  3.150 4.724 1.555 1.102 52 3829 25981 17417 3116 46011 30626 2226
  3.346 4.921 1.555 1.102 52 4633 27868 19014 2121 40641 27723 4119
  3.543 5.118 1.555 1.102 52 4888 26416 18143 2895 42673 29610 3939
  3.740 5.315 1.555 1.102 52 5785 27868 19595 1901 38173 26852 5464
  3.937 5.709 1.850 1.299 92 7074 28406 19565 5318 47971 33043 4665
  4.331 6.102 1.850 1.299 92 7736 25652 18261 5783 45072 32029 5138
  4.724 6.496 1.850 1.299 92 9591 26667 19420 6609 47101 34203 6952
  5.118 7.087 2.047 1.496 92 12924 23478 16957 8342 41304 29855 9871
  5.512 7.480 2.047 1.496 92 15239 23768 17536 7494 38841 28551 13270
  5.906 7.874 2.047 1.496 92 17736 24203 18116 6653 36522 27391 16440
  6.299 8.268 2.047 1.496 92 20412 24493 18696 5805 34638 26377 19569
  6.693 8.858 2.362 1.732 140 23961 22754 17246 15909 42174 31884 17917
  7.087 9.252 2.362 1.732 140 27579 23333 17826 13984 39565 30290 23770
  7.480 9.843 2.677 2.047 140 33847 21304 16087 17753 35072 26667 28818
  7.874 10.236 2.677 2.047 140 38051 21594 16522 15600 33043 25507 34707
  8.661 11.220 2.913 2.205 218 48956 21159 16232 24096 35072 27101 42615
  9.449 12.008 2.913 2.205 218 61288 22174 17391 14995 30145 23768 59425
  10.236 12.795 2.913 2.205 218 74872 23043 18406 12399 29130 23333 73839
  11.024 13.976 3.406 2.598 299 91631 20290 16087 28352 29565 23333 87134
  11.811 14.764 3.406 2.598 299 109973 21159 16957 18307 26812 21449 108438
  12.598 15.945 3.957 3.071 428 152754 21594 17101 27452 27246 21449 150267
  13.386 16.732 3.957 3.071 428 161688 20290 16232 42720 28406 22754 155942
  14.173 17.913 4.567 3.543 575 208304 20000 15797 55045 27391 21739 200899
  14.961 18.701 4.567 3.543 575 219134 18841 15072 64169 27101 21739 209528
  15.748 19.488 4.567 3.543 575 229929 17826 14348 110975 31449 25362 201375
  16.535 20.276 4.567 3.543 575 267434 18841 15362 69022 26957 21884 258374
  17.323 21.457 5.118 4.016 738 326623 18261 14783 83449 25507 20580 315783
  18.110 22.244 5.118 4.016 738 340522 17536 14203 130794 28261 23043 314402
  18.898 23.031 5.118 4.016 738 372103 17536 14348 124015 27391 22464 350828
  19.685 23.819 5.118 4.016 738 405030 17536 14493 117244 26522 21884 387689
  20.472 24.803 5.118 4.016 738 429750 17246 14203 143443 27826 22899 405103
  21.260 25.591 5.118 4.016 738 445227 16522 13768 190788 30000 24928 402278
  22.047 26.378 5.118 4.016 738 491380 16957 14203 156955 27681 23188 465639
  22.835 27.165 5.118 4.016 738 528973 17101 14348 150177 26957 22609 507208
  23.622 27.953 5.118 4.016 738 546055 16522 13913 197522 28986 24493 509080
  24.409 28.740 5.118 4.016 738 585626 16522 14058 190743 28261 24058 553692
  25.197 29.528 5.118 4.016 738 626524 16667 14203 183972 27536 23478 598904
  25.984 30.315 5.118 4.016 738 668745 16667 14348 177194 26957 23043 644842
  26.772 31.102 5.118 4.016 738 687725 16087 13913 224532 28696 24783 650040
  27.559 31.890 5.118 4.016 738 757148 16812 14493 163645 25652 22174 739251
  28.346 32.677 5.118 4.016 738 777410 16232 14058 210982 27391 23768 748234
  29.134 33.465 5.118 4.016 738 824226 16377 14203 204212 26812 23333 798528
  29.921 34.252 5.118 4.016 738 872354 16377 14348 197433 26377 23043 849718
  30.709 35.039 5.118 4.016 738 907825 16232 14203 217716 26812 23478 881331
  31.496 35.827 5.118 4.016 738 943932 16087 14058 238000 27391 24058 913436
  32.283 36.614 5.118 4.016 738 995312 16087 14203 231229 26812 23623 968081
  33.071 37.402 5.118 4.016 738 1047997 16087 14203 224451 26377 23333 1023679
  33.858 38.189 5.118 4.016 738 1101983 16232 14348 217680 25797 22899 1080269
  34.646 38.976 5.118 4.016 738 1157269 16232 14493 210901 25362 22609 1137889
  35.433 39.764 5.118 4.016 738 1197881 16087 14348 231185 25797 23043 1175361
  36.220 40.551 5.118 4.016 738 1239124 15942 14203 251468 26377 23478 1213339
  37.008 41.339 5.118 4.016 738 1297633 15942 14348 244689 25942 23188 1274355
  37.795 42.126 5.118 4.016 738 1357435 15942 14348 237919 25507 22899 1336423
  38.583 42.913 5.118 4.016 738 1401230 15797 14203 258202 25942 23333 1377236
  39.370 43.701 5.118 4.016 738 1445652 15652 14203 278485 26377 23768 1418576

Images & Drawings

Dimensions Dimensions
Location Location

Product Characteristics

  • One of the most demanding challenges of our promise of performance is the conveyor pulley application field. The extreme loads which such components are subject to, especially the high bending moment, coupled with the simultaneous indispensable reliability and longest possible service life, require the highest of engineering know-how. Our international development team, which has already set benchmarks in quality Locking Assemblies for the RfN 7012, RfN 7012.2, RfN 7015.0 and RfN 7015.1 products, is here setting a further milestone.
  • Quality means: high-quality materials and material services, and the most precise workmanship, guarantee sustainable product usage.
  • Performance means: reliability, and long service life means: minimization of machine downtime and maximization of service life.
  • Price means: not just the newest, but also the most economical RINGFEDER® Locking Assemblies product at the high level of performance you are used to.

Typical belt drum application

The bending moment acting on the hub/shaft connection is the main load to evaluate in a belt drum or similar application. Excessive bending moments can cause overstress in the webs between the screw holes in the Locking Assembly. In the case of additional loads (bending moments/ radial loads) screw tightening torques may have to be reduced. To limit the influence of the bending load on the locking assembly connection we use the two following criteria during the belt drum design process:

  • Shaft deflection from the bending moments may only have a maximum deflection fm < 1/2000 · L (bearing centre distance).
  • The permissible bending load values as shown in the Table / CAD data tab.

Explanation to table

A bending moment, created by radial forces, results in an additional load for the Locking Assembly, shaft and hub. This load creates an additional pressure, works in rotation and has to be superpositioned with the pressure resulting from the Locking Assembly. For a viable connection, a minimum surface pressure at the contact areas between Locking Assembly, shaft and hub must be maintained, as soon as shaft and hub have to take up the maximal pressures. Additionally, the listed torque values (T) have been reduced due to the additional bending moments. To achieve lower stresses for the Locking Assemblies the screw tightening torques (TA) have also been reduced.

RINGFEDER® Locking Assemblies – How to Use Them?

Learn more about application and functionality of our premium-quality, high-performance RINGFEDER® Locking Assemblies in our short video.

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RINGFEDER® Locking Assemblies – How to Use Them?

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Product Paper RINGFEDER® Locking Assemblies for Bending Loads

Product Paper RINGFEDER® Locking Assemblies for Bending Loads

EN English DE German
Tech Paper Locking Assemblies for Bending Loads RINGFEDER® RfN 7012

Tech Paper Locking Assemblies for Bending Loads RINGFEDER® RfN 7012

EN English DE German
Instruction Manual Locking Assemblies RINGFEDER® RfN 7012, RfN 7012.2

Instruction Manual Locking Assemblies RINGFEDER® RfN 7012, RfN 7012.2

DE German EN English

If indicated pressures are too high for your specific application, please refer to the corresponding Tech Papers with reduced bending loads (Mb 20% to Mb 80%).

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