5/16"-18 x 1" ASTM F593 18-8 Stainless Steel Hex Cap Screw / THREAD CLASS: 2A THREAD DIRECTION: RIGHT-HAND THREAD LENGTH: 0.97 INCHES MINIMUM AND 1.00 INCHES MAXIMUM FASTENER LENGTH: 0.97 INCHES MINIMUM AND 1.00 INCHES MAXIMUM HEAD STYLE: C1 HEXAGON HEAD HEIGHT: 0.195 INCHES MINIMUM AND 0.211 INCHES MAXIMUM WIDTH BETWEEN FLATS: 0.489 INCHES MINIMUM AND 0.500 INCHES MAXIMUM END ITEM IDENTIFICATION: 2355-01-539-3639 NOMINAL THREAD DIAMETER: 0.3125 INCHES THREAD QUANTITY PER INCH: 18 CHAMFER ANGLE: 15.0 DEGREES MINIMUM AND 30.0 DEGREES MAXIMUM PART NAME ASSIGNED BY CONTROLLING AGENCY: 5/16-18X1,HEX CAP SCREW,18-8 STAINLESS STEEL MATERIAL: STEEL PROPERTY CLASS 18.8 OVERALL MATERIAL DOCUMENT AND CLASSIFICATION: ALLOY,GROUP 1,COND CW OF ASTM F593 ASSN STD SINGLE MATERIAL RESPONSE OVERALL SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: DESCALED OR CLEAN IAW ASTM A380 ASSN STD SINGLE TREATMENT RESPONSE OVERALL THREAD SERIES DESIGNATOR: UNC