Ho na le mefuta e mengata ea li-screw tse kopantsoeng, tse kenyelletsang li-screw tse peli tse kopantsoeng le li-screw tse tharo tse kopantsoeng (washer e bataletseng le washer ea selemo kapa washer e arohaneng e bataletseng le washer ea selemo) ho latela mofuta oa lisebelisoa tse kopantsoeng; Ho ea ka mofuta oa hlooho, e ka boela ea aroloa ka li-screws tsa "pan head combinations", "countersunk head combination screws", "hexagonal combination screws", joalo-joalo; Ho ea ka thepa, e arotsoe ka tšepe ea carbon, tšepe e sa hloekang le tšepe ea alloy (Grade 12.9).