Value Collection 211157P Flat Socket Cap Screw 5/16-18

Product Description

The VALUE COLLECTION 211157P is a flat socket cap screw designed for countersunk fastening applications in mechanical assemblies and structural connections. It features an 82-degree flat head with a 3/16-inch hex socket drive and a 5/16-18 UNC thread at 1/2 inch overall length. The alloy steel construction is finished in black oxide for moderate corrosion resistance and a low-reflectance appearance. Fully threaded along the entire shank length, this screw delivers consistent clamping load across the engaged thread engagement zone. Machinists, millwrights, and maintenance technicians install this type of fastener where a flush or recessed head is required.

This flat socket cap screw is suited for use in machinery frames, fixture plates, tooling components, and equipment enclosures where a flush surface is necessary. The 5/16-18 UNC thread form is one of the most common coarse-thread sizes in inch-series mechanical work, making this screw a standard choice across manufacturing, industrial maintenance, and fabrication environments. Its compact 1/2-inch length is appropriate for thin material stacks or shallow tapped holes. This item is sold individually but requires a minimum order quantity of 100 pieces.

Key Features

• 82-degree flat head seats flush in standard countersunk holes per ASME/ANSI B18.3
• 3/16-inch hex socket drive for use with standard Allen keys or hex bit drivers
• Fully threaded shank maximizes thread engagement in shallow tapped holes
• Alloy steel construction provides high tensile strength consistent with ASTM F835
• Black oxide finish offers mild corrosion resistance and reduces light reflection
• UNC 5/16-18 thread form is widely compatible with standard inch-series tapped holes

Compatibility

Designed for use in any standard 5/16-18 UNC tapped hole requiring an 82-degree countersunk flat head fastener per ASME/ANSI B18.3 and ASTM F835 specifications.

Installation Notes

Installation is performed by machinists, millwrights, or maintenance technicians using a 3/16-inch hex key or hex socket bit driver. Ensure the mating countersink is machined to 82 degrees to achieve full head seating. De-energize or lock out any equipment before installing or removing fasteners in live machinery per applicable OSHA lockout/tagout procedures. Do not substitute an SAE or metric driver size, as improper fit will damage the socket recess.