Nut-Locking. The manufacturer has changed vendors and the part may vary in character. Some do not have a nylon insert, however the nut is a locking type.
Genuine OEM Part - Manufacturer #586668901
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Nut centerlock
Genuine OEM Part - Manufacturer #873930500
Nut 1/4-20 nylock
Genuine OEM Part - Manufacturer #703232
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Nut 1/4-20
Genuine OEM Part - Manufacturer #530015197
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Locknut
Genuine OEM Part - Manufacturer #880020YP
Locknut-1/4-20(iso
Genuine OEM Part - Manufacturer #530015515
Locknut-10-24
Genuine OEM Part - Manufacturer #530015768
Nut-type ""u"" spee
Genuine OEM Part - Manufacturer #530015922
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Nut (7/16-20)(l.h.)
Genuine OEM Part - Manufacturer #530016032
Nut,hex (10-24)
Genuine OEM Part - Manufacturer #530016284
Nut, cap
Genuine OEM Part - Manufacturer #530091596
Order by 8:00 PM ET, this part ships TODAY!
Nut hex lock 10-24
Genuine OEM Part - Manufacturer #530403094
Nut 5/16-24
Genuine OEM Part - Manufacturer #530626605
Nut,10-24hex zinc-p
Genuine OEM Part - Manufacturer #534790500
Order by 8:00 PM ET, this part ships TODAY!
Nut-center lock
Genuine OEM Part - Manufacturer #703893
Order by 8:00 PM ET, this part ships TODAY!