KOBELT MANUFACTURING CO. LTD MNL-5022-A.docx (rev B)
10
To achieve the runout tolerance the mounting face on the rotating element must be machined
flat. Excessive run-out of the disc could cause premature wear of the linings, caliper pins, lever
journals as well as the actuators.
The disc mounting bolts used must be of a suitable size and grade to safely resist the brake
torque plus the stresses induced from thermal expansion of the disc. For high temperature disc
applications, the holes for the mounting bolts must be machined oversized to allow the disc to
expand during operation. Ensure that adequate washers are used to bridge the gap between
the bolt and bolt hole.
Table 2: Mounting Bolt Radial Clearance
MOUNTING BOLT RADIAL CLEARANCE
Disc Bolt Circle
In [mm]
Maximum Disc Temperature, °F [°C]
400 [204]
500 [260]
600 [316]
700 [371]
10 [254]
0.011 [0.3]
0.014 [0.4]
0.017 [0.4]
0.021 [0.5]
15 [381]
0.016 [0.4]
0.021 [0.5]
0.026 [0.7]
0.031 [0.8]
20 [508]
0.022 [0.6]
0.028 [0.7]
0.035 [0.9]
0.041 [1.0]
25 [635]
0.027 [0.7]
0.035 [0.9]
0.043 [1.1]
0.051 [1.3]
30 [762]
0.032 [0.8]
0.042 [1.1]
0.052 [1.3]
0.062 [1.5]
35 [889]
0.038 [1.0]
0.049 [1.2]
0.061 [1.5]
0.072 [1.8]
40 [1016]
0.043 [1.1]
0.056 [1.4]
0.069 [1.8]
0.082 [2.1]
45 [1143]
0.049 [1.2]
0.063 [1.5]
0.078 [2.0]
0.092 [2.3]
To reduce the size of the mounting bolt clearance hole it is recommended to offset the bolt
circle on the brake disc inwards the required amount for radial clearance. The end result is the
brake disc will have a slightly smaller bolt circle than the hub and the required radial clearance
will be on the side where it is needed.
Do not use fitted bolts for installing brake discs. The bolt holes must be
over sized to permit uninhibited expansion.
Do not secure a brake disc to a rotating element by welding.
Do not paint the cooling fins of a ventilated disc. The cooling efficiency will
be compromised and overheating may result.
If the disc was damaged during installation with nicks or welding marks, remove the defects
before putting into service.
For cases where a disc guard or some protective cover is required for a ventilated disc ensure
that the guard does not compromise the performance. An improperly designed cover or shield
may cause air recirculation through the disc or radiant heat reflection, which could result in the
disc overheating. The cooling air pumped through the disc must be exhausted away from the
outer diameter of the disc to allow fresh, cool air to enter the inner vent opening of the disc.
Summary of Contents for 5022-A
Page 8: ...KOBELT MANUFACTURING CO LTD MNL 5022 A docx rev B 8 1 5 MODEL CODE KEY...
Page 23: ...KOBELT MANUFACTURING CO LTD MNL 5022 A docx rev B 23 7 APPENDIX A TECHNICAL DRAWINGS...
Page 24: ...KOBELT MANUFACTURING CO LTD MNL 5022 A docx rev B 24...
Page 25: ...KOBELT MANUFACTURING CO LTD MNL 5022 A docx rev B 25 8 APPENDIX B PARTS LIST DRAWINGS 5022 A...
Page 27: ...KOBELT MANUFACTURING CO LTD MNL 5022 A docx rev B 27 5022 AW...
