1/2"-13 x 1-3/4" Phosphate and Oil Finish SAE J429 Grade 8 Hex Flange Bolt / THREAD CLASS: 2A THREAD DIRECTION: RIGHT-HAND THREAD LENGTH: 1.250 INCHES NOMINAL FASTENER LENGTH: 1.690 INCHES MINIMUM AND 1.790 INCHES MAXIMUM HEAD STYLE: C117 CHAMFER FLANGE HEAD HEIGHT: 0.510 INCHES NOMINAL WIDTH BETWEEN FLATS: 0.736 INCHES MINIMUM AND 0.750 INCHES MAXIMUM EXTENDED WASHER DIAMETER: 1.070 INCHES NOMINAL END ITEM IDENTIFICATION: MRAP - UNIQUE NSN - USED ON 3 MRAP VARIANTS; MRAP MAXXPRO DASH ISS W/OGPK AND W/CROWS NOMINAL THREAD DIAMETER: 0.500 INCHES THREAD QUANTITY PER INCH: 13 PART NAME ASSIGNED BY CONTROLLING AGENCY: BOLT,HEX FLANGE 1/2-13 X 1-3/4 MATERIAL: STEEL OVERALL MATERIAL DOCUMENT AND CLASSIFICATION: SAE J429, GRADE 8 ASSN STD SINGLE MATERIAL RESPONSE OVERALL PROPRIETARY CHARACTERISTICS: NPAC SURFACE TREATMENT: PHOSPHATE OVERALL AND OIL THREAD SERIES DESIGNATOR: UNC