3/8"-24 F. FLANGED HEX NUT (10)Flange is .650" Flange + uses 9/16" WrenchARP200-8634 $9.90 / 10 PAC Details...
3/8"-24 F. SELF LOCKING FLANGED HEX NUT.600" Dia. Flange and uses 7/16" SocketARP200-8104 $6.27 / EA Details...