{"product_id":"value-collection-40871-button-socket-cap-screw-1-4-28","title":"Value Collection -40871 Button Socket Cap Screw 1\/4-28","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe VALUE COLLECTION -40871 is a fully threaded button socket cap screw designed for applications requiring a low-profile fastener head with high tensile strength. Sized at 1\/4-28 UNF with a 5\/8-inch length under the head, this screw is machined from alloy steel and finished with a black oxide coating to provide moderate corrosion resistance and a consistent dark appearance. The 5\/32-inch hex socket drive accepts a standard ball-end or straight hex key. Hardness is rated at 36-43 HRC, conforming to ANSI\/ASME B18.3 and ASTM F835 standards. Thread fit class is 3A, right-hand direction. This fastener is used by machinists, millwrights, and general mechanical trades.\u003c\/p\u003e\n\u003cp\u003eThe -40871 button cap screw is suited for machine assembly, fixture building, and panel or guard attachment where a rounded, low-profile head is needed to clear adjacent components or reduce snag points. The fine 1\/4-28 thread pitch provides strong thread engagement in tapped metal components and is common in precision mechanical assemblies, jigs, and equipment housings. The black oxide finish makes it a common choice where a non-reflective appearance is required alongside reasonable lubricity during installation.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eFully threaded 1\/4-28 UNF fine-thread configuration for strong engagement in tapped metal\u003c\/li\u003e\n  \u003cli\u003eAlloy steel construction with 36-43 HRC hardness per ASTM F835\u003c\/li\u003e\n  \u003cli\u003eBlack oxide coating for moderate corrosion resistance and non-reflective finish\u003c\/li\u003e\n  \u003cli\u003eLow-profile button head reduces snag risk in clearance-critical assemblies\u003c\/li\u003e\n  \u003cli\u003e5\/32-inch hex socket drive compatible with standard hex keys and ball drivers\u003c\/li\u003e\n  \u003cli\u003eConforms to ANSI\/ASME B18.3 dimensional standards\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style replacement or direct-use fastener for applications requiring a 1\/4-28 UNF fully threaded button socket cap screw conforming to ANSI\/ASME B18.3 and ASTM F835.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is performed with a 5\/32-inch hex key or ball-end driver; ensure the drive tool is fully seated before applying torque to avoid rounding the socket. Always verify the mating tapped hole is the correct 1\/4-28 UNF thread form and is clean and free of debris before threading. Black oxide fasteners benefit from a light application of thread lubricant or anti-seize when used in ferrous assemblies subject to moisture. Do not exceed the rated hardness class by substituting this fastener in applications specifying higher-grade cap screws without engineering review.\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\u003eLength Under Head\u003c\/strong\u003e: 5\/8 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHead Type\u003c\/strong\u003e: Button\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\u003eHead Height\u003c\/strong\u003e: 0.132 inches\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\u003eHardness\u003c\/strong\u003e: 36-43 HRC\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Fit Class\u003c\/strong\u003e: 3A\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFastener Standard\u003c\/strong\u003e: ANSI\/ASME B18.3, ASTM F835\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.01 pounds\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: -40871\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"VALUE COLLECTION","offers":[{"title":"Default Title","offer_id":51712322339122,"sku":"-40871","price":3630.63,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/c9c5e446d245147ee649564e2dd3572b.jpg?v=1788486174","url":"https:\/\/voomisupply.com\/products\/value-collection-40871-button-socket-cap-screw-1-4-28","provider":"Voomi Supply","version":"1.0","type":"link"}