Hillman Grade 8 Hex Cap Screws - 5/16"-18 are bolts with hexagonal heads and machine threads for use with a nut or in a tapped hole. These screws are bolts with a washer face under the head.

Features/Specifications

• Made using grade 8 steel: appropriate for marine & heavy machinery applications
• Match with grade 8 washers & nuts
• Partially threaded shank allows for a stronger grip between objects & less shear movement
• Corrosion-resistant finish: yellow dichromate combines lasting durability with strong rust protection
• High-torque design: hex cap head & machine threads combine to offer higher torque capability
• Pre-drilling recommended for installation, drill a hole in the material that matches the diameter of the bolt