Value Collection C52000509 Flat Socket Cap Screw 5/16-18

Product Description

The VALUE COLLECTION C52000509 is a flat socket cap screw designed for fastening applications where a flush or countersunk profile is required. Sized at 5/16-18 x 3 inches overall length with a Unified National Coarse (UNC) thread standard, this screw features an 82-degree flat head and a 7/32-inch hex socket drive. Constructed from 18-8 stainless steel, it offers solid corrosion resistance in moderate-exposure environments. Machinists, maintenance technicians, and fabricators install this type of fastener when a low-profile head must sit flush with or below a mating surface without protruding hardware.

This flat socket cap screw is suited for use in mechanical assemblies, equipment panels, fixtures, and structural connections where a countersunk seat is machined or formed into the workpiece. The 5/16-18 UNC thread engages standard tapped holes of the same designation. The 18-8 stainless steel construction makes it appropriate for indoor, wet, or mildly corrosive environments. Sold in a package quantity of 10, it is well-suited for shop stock or small-batch project use across manufacturing, maintenance, and field-service settings.

Key Features

• 82-degree flat head seats flush in standard countersunk holes for a low-profile finish
• 7/32-inch hex socket drive accepts a standard hex key or Allen wrench for precise torque application
• 18-8 stainless steel construction provides corrosion resistance in moderate-exposure conditions
• 5/16-18 UNC thread engages widely available tapped holes and threaded inserts
• 3-inch overall length accommodates thicker material stacks or deeper fastening requirements
• Package quantity of 10 supports bench stock, service kits, and small assembly runs

Compatibility

Designed as a standard UNC flat socket cap screw compatible with any 5/16-18 tapped hole or threaded insert requiring an 82-degree countersunk seat and a 7/32-inch hex socket drive.

Installation Notes

Installation is performed by machinists, maintenance technicians, or fabricators using a 7/32-inch hex key or Allen wrench. Ensure the mating hole is tapped to 5/16-18 UNC and that the countersink angle matches the 82-degree flat head geometry before driving. Do not overtighten stainless steel fasteners, as 18-8 material is susceptible to galling; apply a compatible anti-seize compound when appropriate. Follow applicable mechanical or structural specifications for the assembly being serviced.