A machine screw is generally a smaller fastener (less than 1⁄4 inch in diameter) threaded the entire length of its shank that usually has a recessed slotted drive type.

Slotted Fillister Machine Screws, ZincSlotted Flathead Machine Screws, ZincSlotted Ovalhead Machine Screws, ZincSlotted Panhead Machine Screws, ZincSlotted Roundhead Machine Screws, ZincSlotted Trusshead Machine Screws, Zinc
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