3/816 UNC, 21/4 Length Under Head, Hex Drive Flange Bolt MSC INDUSTRIALNOTE: ITEM MUST BE ORDERED IN MULTIPLES OF 10. TOTAL RECYCLED CONTENT: 10.00%. POSTCONSUMER RECYCLED CONTENT: 1.00%. CATEGORIES: Maintenance, Repair and Operational (MRO) Supplies. Bolts, Screws & Cap Screws. Flange Bolts. N/A. KEYWORDS: MSC IndustrialBolts, Screws & Cap ScrewsBoltsFlange BoltsN/A.