3/8"-16 x 6" SAE J429 Grade 5 Zinc Finish Steel Tap Bolt / THREAD CLASS: 2A THREAD LENGTH: 5.900 INCHES MINIMUM AND 6.060 INCHES MAXIMUM HEAD HEIGHT: 0.226 INCHES MINIMUM AND 0.268 INCHES MAXIMUM WIDTH BETWEEN FLATS: 0.544 INCHES MINIMUM AND 0.562 INCHES MAXIMUM THREAD QUANTITY PER INCH: 16 PART NAME ASSIGNED BY CONTROLLING AGENCY: 3/8-16X6 HEX TAP BOLT FUL THRD GR5 ZINC SPECIAL FEATURES: MATERIAL IS GRADE 5 STEEL MATERIAL DOCUMENT AND CLASSIFICATION: SAE J-429 ASSN STD SINGLE MATERIAL RESPONSE OVERALL SURFACE TREATMENT: ZINC OVERALL SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: ASTM F1941 ASSN STD SINGLE TREATMENT RESPONSE OVERALL THREAD SERIES DESIGNATOR: UNC