#4-40 x 1/4" ASTM F837 Hex Drive Grade 18-8 Stainless Steel Socket Cap Screw / THREAD CLASS: 3A THREAD DIRECTION: RIGHT-HAND THREAD LENGTH: 0.250 INCHES NOMINAL FASTENER LENGTH: 0.250 INCHES NOMINAL HEAD STYLE: C100 KNURLED NO. 5 HEAD DIAMETER: 0.183 INCHES NOMINAL HEAD HEIGHT: 0.112 INCHES NOMINAL INTERNAL DRIVE STYLE: D5 HEXAGON END ITEM IDENTIFICATION: 5895-01-564-7999 NOMINAL THREAD DIAMETER: 0.250 INCHES WIDTH ACROSS FLATS: 0.094 INCHES NOMINAL THREAD QUANTITY PER INCH: 40 MATERIAL: STEEL CORROSION RESISTING OVERALL THREAD SERIES DESIGNATOR: UNRC