A few common screw head types and what they are used for

screw slot   Dan screw slot file

› Alloy, Metal and Machine Screws › Screws › Slotted Machine Screw Dutux Round Brass Wide Slot Screw, Packaging Type: Packet · Dutux Round Brass

Wingfoil Mastbase Slot Nut + Screw Set 26,90 €  Profile version, STB for attachment in screw slot Length, 2,300 mm Finish, silver anodised Length, 2300 Components, Runner and guide profiles

grandx slot. eu_login 8-18X38 Slot Indented Hex Washer Self Tapping Screw Type AB Full Thread Zinc Bake Green Package Qty: 10000 Total Price: $ ($ Bolt head-Nut profile: Cross slot ; Thread size: 4,8 mm ; Length: 13 mm ; Material: Stainless steel ; Weight: 2 g