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
Order by 8:00 PM ET, this part ships TODAY!
Nut-hex 3/8-24 thread
Genuine OEM Part - Manufacturer #712-0241
Hex nut, 5/16-18 Thd.
Genuine OEM Part - Manufacturer #712-0429
Order by 8:00 PM ET, this part ships TODAY!
Hex jam nut 3/8-24 thd.
Genuine OEM Part - Manufacturer #712-0711
Nut-flat weld
Genuine OEM Part - Manufacturer #712-0414
Lock nut, 3/8-16
Genuine OEM Part - Manufacturer #912-0431
Order by 8:00 PM ET, this part ships TODAY!
Nut-hex 1/4-20
Genuine OEM Part - Manufacturer #712-0271
Nut-nylon lock
Genuine OEM Part - Manufacturer #712-0324
Order by 8:00 PM ET, this part ships TODAY!
Jam nut
Genuine OEM Part - Manufacturer #912-0240
Nut-push
Genuine OEM Part - Manufacturer #726-0233
Order by 8:00 PM ET, this part ships TODAY!
Hex nut 3/8-16 thd.
Genuine OEM Part - Manufacturer #712-0798
Nut-hex 1/4-20
Genuine OEM Part - Manufacturer #712-3006
Nut-shield
Genuine OEM Part - Manufacturer #938-0529
Hex lock nut 3/8-16
Genuine OEM Part - Manufacturer #712-0130