ppipella

Keyless Locking Assemblies

The standard in keyless locking assemblies is the RBL, it is self-centering, and no pilot bushing is needed. The single taper design is better able to handle the bending moment present in pulley applications. For high-tension applications, Precision Pulley & Idler recommends the RBM and the RBH. The graphic shows the relative difference in size and bending moment for each series.
The chart to the right gives a range of standard sizes and the relative torque ratings. This is a representation of the sizes that are commonly available. Nominal inch as well as metric sizes are also available for shaft sizes under 8 inch. For special applications, PPI works with the vendor to engineer an appropriate locking assembly designed just for that application.

Metric Size (mm) English Size (in) RBL RBM RBH
25 1 308    
30 1 3/16 370    
35 1 3/8 576    
40 1 1/2 658    
45 1 3/4 1,196    
50 1 15/16 1,329    
55 2 3/16 1,671    
60 2 3/8 1,823    
65 2 9/16 2,222    
70 2 3/4 3,377    
75 2 15/16 3,618    
80 3 3,859    
85 3 3/8 4,613    
90 3 7/16 4,885    
95 3 3/4 5,729    
100 3 15/16 7,024 13,516  
110 4 7/16 7,726 14,868  
120 4 3/4 9,482 17,842  
130 4 15/16 14,095 24,600  
140 5 7/16 15,179 28,384 47,224
150 5 15/16 18,070 30,412 54,211
160   21,202 34,602 61,680
170 6 7/16 24,576 47,291 79,695
180 6 15/16 26,021 50,073 90,410
190 7 7/16 34,333 56,378 101,795
200 7 7/8 36,140 66,764 107,153
220 8.661 44,201 85,055 132,602
240 9.449 60,273 123,717 160,729
260 10.236 78,355 140,728 182,829
280 11.024 90,252 168,979 263,439
300 11.811 108,786 181,049 313,618
320 12.598 150,537 257,492 351,252
340 13.386 186,603 273,586 390,977
360 14.173 210,810 360,590 491,890
380 14.961 259,609 380,623 543,942
400 15.748 273,272 440,721 624,622
420 16.535   504,826 655,853
440 17.323   528,865 687,084
460 18.11   552,904 718,316
480 18.898   600,983 874,471
500 19.685   626,024 910,907
520 20.472   729,193 1,015,011
540 21.26   757,239 1,054,050
560 22.047   841,376 1,165,962
580 22.835   871,425 1,207,603
600 23.622   901,475 1,288,283

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