3/8"-24 F. FLANGED HEX NUT (10)Flange is .650" Flange + uses 9/16" WrenchMFG: ARP FASTENERSARP200-8634 $7.05 / EA Details...
3/8"-24 F. SELF LOCKING FLANGED HEX NUT.600" Dia. Flange and uses 7/16" SocketMFG: ARP FASTENERSARP200-8104 $3.26 / EA Details...