{"product_id":"value-collection-721163pr-flat-socket-cap-screw-1-4-28","title":"Value Collection 721163PR Flat Socket Cap Screw 1\/4-28","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe VALUE COLLECTION 721163PR is a flat socket cap screw designed for precision fastening in applications where a flush or countersunk head profile is required. It features a 1\/4-28 UNF thread and measures 3-1\/2 inches in overall length. The 82-degree flat head seats into standard countersunk holes, and the 5\/32-inch hex socket drive accepts a standard Allen key. Constructed from alloy steel with a black oxide finish, this screw offers good strength and mild corrosion resistance. It is partially threaded, providing a smooth shank section that helps maintain positional alignment in close-tolerance assemblies. Machinists, millwrights, and general maintenance mechanics install this type of fastener in metalworking, tooling, and light-to-medium structural applications.\u003c\/p\u003e\n\u003cp\u003eThis flat socket cap screw is suited for use in metal fabrication, jig and fixture assembly, machine guarding, and similar applications where a low-profile head is necessary to avoid interference with mating components. The fine UNF thread pitch offers tighter thread engagement compared to coarse thread fasteners, making it a common choice in precision assemblies and applications subject to vibration. The black oxide finish reduces light reflection and provides a degree of surface protection in dry or lightly oiled environments. Minimum order quantity is 5 pieces.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e82-degree flat head seats flush in standard countersunk holes, eliminating head protrusion\u003c\/li\u003e\n  \u003cli\u003e5\/32-inch hex socket drive for use with standard Allen or hex key tools\u003c\/li\u003e\n  \u003cli\u003e1\/4-28 UNF fine thread for tighter engagement and improved resistance to loosening under vibration\u003c\/li\u003e\n  \u003cli\u003ePartially threaded shank aids in alignment and reduces stress concentration at the thread runout\u003c\/li\u003e\n  \u003cli\u003eAlloy steel construction provides high tensile strength suitable for demanding mechanical assemblies\u003c\/li\u003e\n  \u003cli\u003eBlack oxide finish reduces surface glare and offers light corrosion protection in dry service conditions\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style replacement or standard component for assemblies requiring a 1\/4-28 UNF countersunk flat socket cap screw per ASME\/ANSI B18.3 and ASTM F835 fastener standards.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is typically performed by machinists, maintenance mechanics, or assemblers using a calibrated 5\/32-inch hex key or Allen driver. Ensure the mating countersunk hole is machined to the correct 82-degree included angle before installation to achieve proper head seating. Always torque to the value specified in the applicable assembly drawing or fastener standard — do not over-drive, as alloy socket cap screws can shear if torque exceeds material limits. Confirm thread engagement length meets design requirements before final assembly.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 1\/4-28\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Standard\u003c\/strong\u003e: UNF\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 3-1\/2 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHead Type\u003c\/strong\u003e: 82-degree Flat\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrive Type\u003c\/strong\u003e: Hex Socket\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrive Size\u003c\/strong\u003e: 5\/32 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThreading\u003c\/strong\u003e: Partially Threaded\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Alloy Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFinish\u003c\/strong\u003e: Black Oxide\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFastener Standard\u003c\/strong\u003e: ASME\/ANSI B18.3; ASTM F835\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.01 pounds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMinimum Order Quantity\u003c\/strong\u003e: 5\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eStandard Information\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: VALUE COLLECTION\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 721163PR\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"VALUE COLLECTION","offers":[{"title":"Default Title","offer_id":51702118678834,"sku":"721163PR","price":1071.6,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/d4e14fa2f3ded20955a633a001935bb0_5e323537-a1c5-47ce-b850-88b625a979ae.jpg?v=1788409411","url":"https:\/\/voomisupply.com\/products\/value-collection-721163pr-flat-socket-cap-screw-1-4-28","provider":"Voomi Supply","version":"1.0","type":"link"}