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Locking Assembly RfN 7012.2

The original RINGFEDER® Locking Assemblies featuring double-tapered thrust rings with self-releasing tapers. They bridge relatively large fit clearances, are easy to install, adjust or remove, but are not self-centering. A pre-centering hub section is usually required.

RINGFEDER® RfN 7012.2

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metric inch
CAD d D L L1 L3 T pW pN DG TA DN min bei Rp0,2 400 N/mm2 Tmax
  mm mm mm mm mm Nm N/mm2 N/mm2 mm Nm mm Nm
  100 145  47  33 26  12074 246 170 12 145  189 15557
  110 155  47  33 26  13203 223 158 12 145  198 17113
  120 165  47  33 26  16529 234 170 12 145  215 21541
  130 180  52  38 34 22568 208 150 12 145  227 29558
  140 190  52  38 34 26739 213 157 12 145  242 35183
  150 200  52  38 34 31242 217 162 12 145  257 41286
  160 210  52  38 34 36077 220 168 12 145  272 47868
  170 225  60  44  38 43873 212 160 14 230 288 58433
  180 235  60  44  38 50697 218 167 14 230 305 67763
  190 250  68  52  46  62608 200 152 14 230 316 83967
  200 260  68  52  46  68125 196 151 14 230 328 91660
  220 285  74  56  50  89763 197 152 16 355 360 121495
  240 305 74  56  50  101288 187 147 16 355 383 137841
  260 325 74  56  50  125978 198 158 16 355 415 172302
  280 355 86,5 66  60  157579 178 140 18 485  440 216523
  300 375 86,5 66  60  173905 171 137 18 485  463 239989
  320 405  100,5 78  72  239969 173 136 20 690 499 332496
  340 425  100,5 78  72  262469 167 134 20 690 522 365053
  360 455  116  90  84  349828 170 135 22 930 560 488295
  380 475  116  90  84  379517 166 133 22 930 582 531530
  400 495  116  90  84  410280 162 131 22 930 605 576460
  420 515  116  90  84  467378 167 136 22 930 635 658690
  440 545  130  102  96  574502 164 132 24 1200 668 812021
  460 565  130  102  96  615138 161 131 24 1200 690 871875
  480 585  130  102  96  657024 158 129 24 1200 713 933724
  500 605  130  102  96  717664 159 131 24 1200 739 1022508
  520 630  130  102  96  762703 156 129 24 1200 767 1089345
  540 650  130  102  96  808986 153 127 24 1200 790 1158177
  560 670  130  102  96  875976 154 129 24 1200 816 1256937
  580 690  130  102  96  945507 155 131 24 1200 842 1359686
  600 710  130  102  96  996807 153 129 24 1200 865 1436499
  620 730  130  102  96  1049341 151 128 24 1200 888 1515307
  640 750  130  102  96  1147229 155 132 24 1200  918 1659954
  660 770  130  102  96  1226223 156 133 24 1200 944 1777667
  680 790  130  102  96  1261026 151 130 24 1200 963 1831536
  700 810  130  102  96  1295765 146 126 24 1200 982 1885405
  720 830  130  102  96  1330443 142 123 24 1200 1001 1939274
  740 850  130  102  96  1415618 143 124 24 1200 1028 2066962
  760 870  130  102  96  1503294 144 126 24 1200 1054 2198641
  780 890  130  102  96  1566909 142 125 24 1200 1077 2295406
  800 910  130  102  96  1631741 141 124 24 1200 1099 2394165
CAD d D L L1 L3 T pW pN DG TA DN min bei Rp0,2 400 N/mm2 Tmax
  inch inch inch inch inch ft-lbs psi psi mm ft-lbs inch ft-lbs
  3.937 5.709 1.850 1.299 1.024 8905 35652 24638 12 107 7.441 11474
  4.331 6.102 1.850 1.299 1.024 9738 32319 22899 12 107 7.795 12622
  4.724 6.496 1.850 1.299 1.024 12191 33913 24638 12 107 8.465 15888
  5.118 7.087 2.047 1.496 1.339 16646 30145 21739 12 107 8.937 21801
  5.512 7.480 2.047 1.496 1.339 19722 30870 22754 12 107 9.528 25950
  5.906 7.874 2.047 1.496 1.339 23043 31449 23478 12 107 10.118 30451
  6.299 8.268 2.047 1.496 1.339 26609 31884 24348 12 107 10.709 35306
  6.693 8.858 2.362 1.732 1.496 32359 30725 23188 14 170 11.339 43099
  7.087 9.252 2.362 1.732 1.496 37393 31594 24203 14 170 12.008 49980
  7.480 9.843 2.677 2.047 1.811 46178 28986 22029 14 170 12.441 61932
  7.874 10.236 2.677 2.047 1.811 50247 28406 21884 14 170 12.913 67606
  8.661 11.220 2.913 2.205 1.969 66207 28551 22029 16 262 14.173 89611
  9.449 12.008 2.913 2.205 1.969 74707 27101 21304 16 262 15.079 101668
  10.236 12.795 2.913 2.205 1.969 92918 28696 22899 16 262 16.339 127085
  11.024 13.976 3.406 2.598 2.362 116226 25797 20290 18 358 17.323 159701
  11.811 14.764 3.406 2.598 2.362 128267 24783 19855 18 358 18.228 177009
  12.598 15.945 3.957 3.071 2.835 176994 25072 19710 20 509 19.646 245240
  13.386 16.732 3.957 3.071 2.835 193590 24203 19420 20 509 20.551 269253
  14.173 17.913 4.567 3.543 3.307 258023 24638 19565 22 686 22.047 360153
  14.961 18.701 4.567 3.543 3.307 279921 24058 19275 22 686 22.913 392042
  15.748 19.488 4.567 3.543 3.307 302611 23478 18986 22 686 23.819 425181
  16.535 20.276 4.567 3.543 3.307 344725 24203 19710 22 686 25.000 485831
  17.323 21.457 5.118 4.016 3.780 423737 23768 19130 24 885 26.299 598924
  18.110 22.244 5.118 4.016 3.780 453709 23333 18986 24 885 27.165 643071
  18.898 23.031 5.118 4.016 3.780 484602 22899 18696 24 885 28.071 688689
  19.685 23.819 5.118 4.016 3.780 529329 23043 18986 24 885 29.094 754173
  20.472 24.803 5.118 4.016 3.780 562548 22609 18696 24 885 30.197 803470
  21.260 25.591 5.118 4.016 3.780 596685 22174 18406 24 885 31.102 854239
  22.047 26.378 5.118 4.016 3.780 646095 22319 18696 24 885 32.126 927081
  22.835 27.165 5.118 4.016 3.780 697379 22464 18986 24 885 33.150 1002866
  23.622 27.953 5.118 4.016 3.780 735217 22174 18696 24 885 34.055 1059521
  24.409 28.740 5.118 4.016 3.780 773964 21884 18551 24 885 34.961 1117648
  25.197 29.528 5.118 4.016 3.780 846164 22464 19130 24 885 36.142 1224335
  25.984 30.315 5.118 4.016 3.780 904428 22609 19275 24 885 37.165 1311157
  26.772 31.102 5.118 4.016 3.780 930097 21884 18841 24 885 37.913 1350890
  27.559 31.890 5.118 4.016 3.780 955720 21159 18261 24 885 38.661 1390622
  28.346 32.677 5.118 4.016 3.780 981297 20580 17826 24 885 39.409 1430354
  29.134 33.465 5.118 4.016 3.780 1044120 20725 17971 24 885 40.472 1524533
  29.921 34.252 5.118 4.016 3.780 1108787 20870 18261 24 885 41.496 1621656
  30.709 35.039 5.118 4.016 3.780 1155708 20580 18116 24 885 42.402 1693027
  31.496 35.827 5.118 4.016 3.780 1203526 20435 17971 24 885 43.268 1765869

Characteristics

  • Slimmest design, especially suitable for applications where space is limited. The Locking Assembly RfN 7012 compensates small tolerance deviations and compensates small mounting errors.
  • Large transmittable forces and moments – several Locking Assemblies RfN 7012 can be placed one behind the other. The transmissible torque and axial forces are added - please take in this respect consulting with our technical experts.
  • Bending moment and radial loads – combined loads can be transmitted. (Please contact our technical department for assistance).
  • Easy installation – RfN 7012 Locking Assemblies can bridge large clearances without the loss of transmission values.
  • Low risk to contamination – during the tightening process the functional surfaces of the device and connection are pressed together generating a surface pressure that does not allow the ingress of contamination.
  • Free from wear – the Locking Assembly RfN 7012 works without moving parts on shaft and hub, through this, abrasive wear and backlash are avoided. Thus, RfN 7012 can be repeatedly clamped and released.

Example applications

  • chain wheels
  • levers
  • pulleys
  • slip-on gear mechanisms
  • belt drums
  • running wheels
  • cable sheaves

Mounting of Locking Assembly

The Locking Assemblies are supplied slightly oiled and ready-to-use. The values for T, Fax, pW and pN apply to Locking Assemblies in delivery condition.

Surface finishes

For shafts and hub bores Ra = 3,2 μm

Tolerances

We recommend the following mounting tolerances

Shaft: k9-h9; Hub: N9-H9
Max. admissible Shaft: k11-h11; Hub: N11-H11

To avoid excessive deformations of the relatively thickwalled thrust rings, the Locking Assembly should be located as symmetrically as possible between shaft and hub bore. If the shaft is smaller than nominal d, the bore should exceed nominal D to the same extent and vice versa. The concentricity quality is determined by the direct centering between shaft and hub.

Arrangement of several Locking Assemblies RfN 7012

If several Locking Assemblies are to be installed the transmission values of the table can be added when the Locking Assemblies are located within a distance of 4·L.

Change of screw tightening torques

The Locking Assemblies are equipped with 12.9 grade screws. A reduction of the screw tightening torque is possible. The lowest allowable screw tightening torque results from the multiplication of the TA-value by 0,5. There is an approximate linear relationship between T, TA , Fax, pW and pN.

Auxiliary threads

To facilitate removal, the front thrust rings have auxiliary threads.

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