3/8"-24 x 1-1/4" Grade 5 Zinc Finish Hex Cap Screw / THREAD DIRECTION: RIGHT-HAND THREAD LENGTH: 0.312 INCHES NOMINAL FASTENER LENGTH: 1.250 INCHES NOMINAL HEAD STYLE: C1 HEXAGON HEAD HEIGHT: 0.226 INCHES MINIMUM AND 0.243 INCHES MAXIMUM WIDTH BETWEEN FLATS: 0.551 INCHES MINIMUM AND 0.562 INCHES MAXIMUM NOMINAL THREAD DIAMETER: 0.375 INCHES THREAD QUANTITY PER INCH: 24 MATERIAL: STEEL COMP 316 OVERALL SURFACE TREATMENT: ZINC OVERALL THREAD SERIES DESIGNATOR: UNF