3/8"-16 x 1-1/4" Hex - Unslotted Indented Hex Washer Head Zinc Finish Type D Point Steel Thread Cutting Screw / THREAD DIRECTION: RIGHT-HAND THREAD LENGTH: 1.000 INCHES NOMINAL FASTENER LENGTH: 1.000 INCHES NOMINAL HEAD STYLE: C1 HEXAGON HEAD HEIGHT: 0.270 INCHES MINIMUM AND 0.295 INCHES MAXIMUM WIDTH BETWEEN FLATS: 0.551 INCHES MINIMUM AND 0.562 INCHES MAXIMUM END ITEM IDENTIFICATION: 2320-01-413-3739, TRUCK,UTILITY NOMINAL THREAD DIAMETER: 0.375 INCHES THREAD QUANTITY PER INCH: 16 PART NAME ASSIGNED BY CONTROLLING AGENCY: HEXAGON HEAD TAPPING SCREW MATERIAL: STEEL OVERALL SURFACE TREATMENT: CADMIUM OVERALL OR ZINC