Value Collection -48409-3 Flat Socket Cap Screw 1/2-13

Product Description

The VALUE COLLECTION -48409-3 is a flat socket cap screw designed for fastening applications that require a flush or countersunk head profile. It features an 82-degree flat head driven by a 5/16-inch hex socket, making it compatible with standard Allen wrenches and hex key sets. The screw is manufactured from alloy steel with a black oxide finish for moderate corrosion resistance. At 1/2-13 UNC thread size and 3-1/2 inches in overall length with partial threading, it is suited for through-bolt and tapped-hole assemblies where a low-profile head is required. Machinists, millwrights, and maintenance technicians are the typical installers.

This flat socket cap screw is used in general industrial, mechanical, and structural assemblies where a countersunk fastener is needed to sit flush with or below the mating surface. The 1/2-13 UNC coarse thread pattern is standard in inch-dimensioned metalworking and fabrication environments. Partial threading allows the unthreaded shank to act as a shoulder or locating feature in certain joint configurations. Sold in packages of 10, this screw is appropriate for shop stock, maintenance repair, and original equipment manufacturing applications.

Key Features

• 82-degree flat head profile seats flush in standard countersunk holes
• 5/16-inch hex socket drive accepts common Allen wrenches and hex bits
• 1/2-13 UNC coarse thread meets ASME/ANSI B18.3 and ASTM F835 standards
• Alloy steel construction provides high tensile strength for demanding fastening applications
• Black oxide finish offers mild corrosion resistance and reduces light reflection
• Partially threaded shank suitable for shoulder or locating joint designs

Compatibility

Designed as a standard inch-series flat socket cap screw for use in any application requiring a 1/2-13 UNC countersunk fastener conforming to ASME/ANSI B18.3 and ASTM F835.

Installation Notes

Installation should be performed by a qualified machinist, millwright, or maintenance technician using a properly sized 5/16-inch hex key or socket bit. Ensure the mating hole is countersunk to 82 degrees to achieve full head seating. De-energize and lock out any machinery before fastener installation or removal in accordance with applicable OSHA lockout/tagout procedures. Do not exceed the fastener's rated torque range for the alloy steel grade being used.