Thomas & Betts 18RA-6FL Electrical Terminal. Sta-Kon® Fork Terminal Insulated Series: RA Series 22 to 16 AWG Conductor #6 Stud 0.97 in Length Brazed Seam/Serrated Barrel Locking Fork Tongue 0.25 in W x 0.02 in THK Tongue 600 VAC Specifications: 0.15 in Dia Maximum Insulation 1/4 in Clearance Vinyl Insulation 105 deg C Copper Electroplated Tin Red. Additional Description: TB -18RA-6FL INS VINYL LKG FORK TERM 22-16 #6 RED. Catalog Description: Vinyl-Insulated Locking Fork Terminal Length .97 Inches Width .25 Inches Maximum Insulation .150 Bolt Hole #6 Wire Range #22-#18 AWG Color Red Copper Tin Plated.