3/8"-16 x 2-1/4" ASTM F879 Hex Drive 18-8 Stainless Steel Button Socket Cap Screw / THREAD CLASS: 2A THREAD DIRECTION: RIGHT-HAND THREAD LENGTH: 2.250 INCHES NOMINAL FASTENER LENGTH: 2.250 INCHES NOMINAL HEAD STYLE: C30 BUTTON HEAD DIAMETER: 0.636 INCHES MINIMUM AND 0.656 INCHES MAXIMUM HEAD HEIGHT: 0.185 INCHES MINIMUM AND 0.199 INCHES MAXIMUM INTERNAL DRIVE STYLE: D5 HEXAGON NOMINAL THREAD DIAMETER: 0.375 INCHES WIDTH ACROSS FLATS: 0.375 INCHES NOMINAL THREAD QUANTITY PER INCH: 16 MATERIAL: STEEL OVERALL THREAD SERIES DESIGNATOR: UNC