Part number. The part number consists of the following:
prefix letter M; general specification number; number of this
specification sheet; dash number; and characters for retainer,,
closures, radial internal clearance or contact angle, calibration,
performance test, lubricant, and lubricant amount.
M81793/27-BA7N4N2A1 indicates - Bore62"; width outside diameter
0.003": retainer, phenolic laminate;
closures, none; contact angle,
greater than 14 but less than 20;
no calibration; performance test,
startting torque - Grade A;
lubricant, MIL-L-6085; lubricant
amount, manufacturer's standard.