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Shop high-strength #4-40 Flat Head Socket Cap Screws with thermal black oxide finish. Ideal for electronics, RC cars, 3D printing, and more. Fast shipping!
Level, align, and adjust spacing on fasteners, shafts, and machine components. Choose from our selection of black oxide washers, including washers, lock washers, and more. In stock and ready to ship.
Type: Flat Head Socket Cap Screw; Matching Nut & Washers: #4-40 - Available here; System of Measurement: U.S. / Inch; Material: Alloy Steel with Thermal Black Oxide; Specifications: ASTM F835, 82° Head (Standard)
FWK04 - #4 - Flat Washers - Black Oxide 100 pcs/pkg. The washer size to be used with a particular screw size is determined by the first number in the screw size. For example, a 4-40 machine screw and a #4 sheet metal have about the same major thread diameter and require a #4 washer, flat or lock.
When it comes to Black Oxide Flat Washers, you can count on Grainger. Supplies and solutions for every industry, plus easy ordering, fast delivery and 24/7 customer support.
Our inventory is stocked with the best in black oxide screws; secure your equipment with our top-of-the-line black oxide machine screws that can hold up under the tightest tolerances. Order screws, hex nuts, square nuts, split lock washers, flat washers, and much, much more easily online now.
Diameter - Thread Pitch: #4-40. 21 Reviews. Ask a question. Black oxide finish adds an extra layer of corrosion and abrasion resistance to stainless steel. A machine screw is commonly identified by its small size. Commonly used for its sleek black look. Chemically treated with a layer of wax or oil.
