The Hillman Group 90389 1 4-20X3 4 RD MACH Screw

Product Description Round Combo Machine Screw Round combo. Z 100-pieces per package. From the Manufacturer Machine screws are used with nuts or screwed directly into a threaded receptacle to fasten metal parts together. Measured from the underside of the head to the tip of the screw to obtain fastener length. If nuts are needed, use with nuts of the same finish and threading for proper fit.