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Because the threads of the mating bolt deform but do not cut into the nylon so nylon insert lock nuts may be re-used a limited number of times. These nuts are considered one-way lock nuts because they can only be installed one way, top up. The number of uses will depend on specific application and environment. Please consider calling Grainger to provide that detail. The phone number is 1-800-323-0620.<br /><br />Thank you for using Grainger Ask and Answer</div><div class="BVQAContentData BVAnswerData"> <div class="BVQAElapsedTime">2 months, 1 week ago</div><div class="BVQASignature"><div class="BVQAWrittenBy">by </div><div class="BVQANickname"><a title="Read all my Q&A" data-bvtrack="eName:ProfileLink" onmouseout=" bvProfileSnapshot.hideOpenPopinAfterDelay(1000 ,250 ); " name="BV_TrackingTag_Answer_Display_ReadAllQA_BobM" class="BVQANickname" onclick="var popupWin = window.open(this.href, null, 'resizable=1,status=1,scrollbars=1,width=800,height=600,top=0'); popupWin.focus(); event.preventDefault?event.preventDefault():event.returnValue = false;" href="http://ugc.grainger.com/profiles/5049-en_us/BobM/profile.htm" onmouseover=" bvProfileSnapshot.showHiddenPopinAfterDelay('BVDI_PSPopin_3embt8664ziiw6368kx28ssd9_ID', 'http://answers.grainger.com/answers/5049-en_us/BobM/profilesnapshot.djs?format=embeddedhtml', 'ProfileSnapshotFrame' ,500, 500 ) && 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