#10-32 x 5/16" Hex - Slotted Drive Indented Hex Washer Head Zinc Finish Steel Machine Screw / THREAD CLASS: 2A THREAD DIRECTION: RIGHT-HAND THREAD LENGTH: 0.3125 INCHES NOMINAL FASTENER LENGTH: 0.3125 INCHES NOMINAL HEAD STYLE: A7 HEXAGON EXTENDED WASHER HEAD HEIGHT: 0.124 INCHES MINIMUM AND 0.151 INCHES MAXIMUM WIDTH BETWEEN FLATS: 0.305 INCHES MINIMUM AND 0.312 INCHES MAXIMUM EXTENDED WASHER DIAMETER: 0.384 INCHES MINIMUM AND 0.414 INCHES MAXIMUM EXTENDED WASHER THICKNESS: 0.019 INCHES MINIMUM AND 0.031 INCHES MAXIMUM INTERNAL DRIVE STYLE: B10 SLOT END ITEM IDENTIFICATION: 01-615-9020 NOMINAL THREAD DIAMETER: 0.190 INCHES THREAD QUANTITY PER INCH: 32 SCREW MATERIAL: STEEL SPECIAL FEATURES: THREAD REQ. ASME B1.1, UNC & UNF THREAD SERIES DESIGNATOR: UNC