Re: Why no lock-washers?
The torque value on a fastener its the rated tension that pulls all the stretch out of the fastener,this tension holds the fastener under load without a locking device.this is why head bolts don't have lock washers
Castellated nuts and cotter pins hold a fastener assembly together,they do not hold a torque value.Backing a torqued faster off to catch a castle for pin insertion is a mistake.
Modern chemical locking compounds are superior to any mechanical locking device,like a lock washer or a castellated nut/cotter pin.
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