{"product_id":"value-collection-40879-2-button-socket-cap-screw-5-16-18","title":"Value Collection -40879-2 Button Socket Cap Screw 5\/16-18","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe VALUE COLLECTION -40879-2 is a button socket cap screw designed for mechanical assemblies requiring a low-profile fastener with high torsional strength. Sized at 5\/16-18 with a 3\/4-inch length under the head, this fully threaded fastener is manufactured from alloy steel and finished with a black oxide coating for corrosion resistance and reduced light reflection. The 3\/16-inch hex socket drive accepts a standard hex key. Hardness is rated at 36-43 HRC, meeting the demands of high-load fastening applications. Machinists, millwrights, and mechanical contractors use this screw where a standard hex cap would protrude too far from the mating surface.\u003c\/p\u003e\n\u003cp\u003eThis button socket cap screw suits general industrial and mechanical applications where a flush or near-flush head profile is required. Typical use cases include machine guards, fixtures, enclosures, and equipment panels. The UNC thread form and Class 3A thread fit provide a controlled tolerance for consistent engagement. Conformance to ANSI\/ASME B18.3 and ASTM F835 makes it appropriate for applications where fastener standards are specified by design documentation or inspection requirements.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eButton head profile keeps fastener height low in the assembly\u003c\/li\u003e\n  \u003cli\u003eAlloy steel construction with 36-43 HRC hardness for high-load service\u003c\/li\u003e\n  \u003cli\u003eBlack oxide finish provides mild corrosion resistance and matte appearance\u003c\/li\u003e\n  \u003cli\u003e3\/16-inch hex socket drive for standard hex key installation\u003c\/li\u003e\n  \u003cli\u003eFully threaded 5\/16-18 UNC, Class 3A thread fit for consistent engagement\u003c\/li\u003e\n  \u003cli\u003eMeets ANSI\/ASME B18.3 and ASTM F835 standards\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as a standard replacement or stocking fastener for any mechanical assembly specifying a 5\/16-18 UNC button socket cap screw per ANSI\/ASME B18.3 or ASTM F835.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation requires a 3\/16-inch hex key or hex bit driver. Confirm mating thread condition and ensure the hole is free of debris before driving. Do not exceed the rated torque for the 5\/16-18 thread size per applicable fastener standards. Alloy steel with black oxide finish is not a substitute for stainless or plated hardware in wet or corrosive outdoor environments.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 5\/16-18\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Standard\u003c\/strong\u003e: UNC\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\u003eLength Under Head\u003c\/strong\u003e: 3\/4 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHead Type\u003c\/strong\u003e: Button\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHead Height\u003c\/strong\u003e: 0.166 inches\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: 3\/16 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Alloy Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFinish\/Coating\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 Coverage\u003c\/strong\u003e: Fully Threaded\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: -40879-2\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"VALUE COLLECTION","offers":[{"title":"Default Title","offer_id":51705071534386,"sku":"-40879-2","price":35.86,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/f7da8e0051a611de9ede6157e8ce9ca9.jpg?v=1788426640","url":"https:\/\/voomisupply.com\/products\/value-collection-40879-2-button-socket-cap-screw-5-16-18","provider":"Voomi Supply","version":"1.0","type":"link"}