1/2-13 Hi-Performance Black-Oxide Steel Nylon-Insert Locknuts, 150PK
$130.99
X1Tools Hi-Performance Black-Oxide Steel Nylon-Insert Locknuts / Stop-Nuts are made to resists loosening due to use or vibration without damaging threads thus prevent a fastener from backing off. (Also Known as lock nut, locking nut, self-locking nut, prevailing torque nut, stiff nut or elastic stop nut)