Check the listing for details. 1/4-20 Flat Head Machine Screws Phillips Stainless Steel All Sizes / Quantities. Condition: New. Listed at 8.69 USD. 1/4-20 Phillips Flat Head Machine Screws Stainless Steel Machine screws are often used with nuts but also often driven into tapped holes (without nuts). They might be considered a screw or a bolt based on the Machinery's Handbook distinction. In practice, they tend to be mostly available in smaller sizes and the smaller sizes are referred to as screws or less ambiguously as machine screws, although some kinds of machine screw can be referred to as stove bolts. A flat head is A head with flat top and a conical bearing surface (bottom). Designed to be Countersunk. Rod with spiral threads the entire length and with one flat end and a head on other end. Holds object to another object that has a pre-threaded hole, frequently a nut. Usually manufactured from metal. Can be rotated into or out of the object using a screwdriver or wrench. General Product Information Flat Head Screws Length is Measured from the top of the Head to the Tip Head Style : Flat Drive Style : Phillips Drive Size : #3 Thread : 1/4-20 Overall Length : Select Length in Drop Down Menu Quantity of Fasteners in Package : Select Package Quantity in Drop Down Detailed Product Information: Head Diameter : 0.477" Head Height : 0.153" Countersink Angle : 82 Degree Thread Diameter : 0.250" Threads Per Inch (TPI) : 20 Coarse or Fine Thread : UNC Coarse Thread Coverage : Fully Threaded Shipping: All orders placed before 3:30 pm EST Will Ship Same Day Tracking is provided on ALL Orders Priority Mail Shipping service is offered at a discount of only $3.95 UPS Ground UPS Next Day Air is available, Please inquire for pricing Returns : ALL returns are accepted if returned within 60 days. Money Back or exchange guaranteed. NO Restocking Fees. For YOU, we constantly strive to find ways of improving our performance.