{"product_id":"holo-krome-64040-button-socket-cap-screw-1-4-20","title":"Holo-krome 64040 Button Socket Cap Screw 1\/4-20","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe HOLO-KROME 64040 is a button socket cap screw designed for mechanical assemblies where a low-profile fastening head is required. Driven by a 5\/32-inch hex socket, it threads into 1\/4-20 UNC tapped holes and seats flush with or slightly above the mating surface thanks to its 0.132-inch button head height. The alloy steel construction is finished in black oxide, which provides moderate corrosion resistance and reduces light reflection in finished assemblies. The fastener is fully threaded to a 3\/8-inch length under the head, conforms to ANSI\/ASME B18.3 and ASTM F835, and carries a thread fit class of 3A for consistent engagement. Hardness is rated at 38 HRC. Installers across mechanical, industrial, and light structural applications use this screw where clearance above the fastener head is limited.\u003c\/p\u003e\u003cp\u003eThis screw is suited for use in machine frames, equipment panels, fixtures, and assemblies that require a secure, low-profile cap fastener. The 1\/4-20 UNC thread is one of the most common inch-series thread sizes in North American mechanical work, making this fastener applicable across a wide range of production and maintenance scenarios. The right-hand thread direction and 3A fit class ensure predictable torque and engagement in standard tapped holes.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eButton head profile with 0.132-inch head height for low-clearance installations\u003c\/li\u003e\n\u003cli\u003e5\/32-inch hex socket drive compatible with standard hex keys and socket drivers\u003c\/li\u003e\n\u003cli\u003eAlloy steel construction rated at 38 HRC hardness\u003c\/li\u003e\n\u003cli\u003eBlack oxide finish for moderate corrosion resistance and reduced reflectivity\u003c\/li\u003e\n\u003cli\u003eFully threaded 3\/8-inch length under head, 1\/4-20 UNC right-hand thread\u003c\/li\u003e\n\u003cli\u003eMeets ANSI\/ASME B18.3 and ASTM F835 fastener standards\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a standard 1\/4-20 UNC button socket cap screw for use in any application requiring ANSI\/ASME B18.3-compliant inch-series socket fasteners with a button head profile.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation requires a 5\/32-inch hex key or socket driver. Power down and de-energize any equipment before servicing fasteners on live assemblies. Confirm the mating tapped hole meets 1\/4-20 UNC thread standards before installation to ensure proper fit class engagement. Do not exceed the rated hardness limits of mating materials when applying torque.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 1\/4-20\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength Under Head\u003c\/strong\u003e: 3\/8 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: 0.132 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHead Diameter\u003c\/strong\u003e: 0.437 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: 5\/32 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Standard\u003c\/strong\u003e: UNRC\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\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: 38 HRC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFastener Standard\u003c\/strong\u003e: ANSI\/ASME B18.3, ASTM F835\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: HOLO-KROME\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 64040\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"HOLO-KROME","offers":[{"title":"Default Title","offer_id":51739496284466,"sku":"64040","price":6628.03,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/22fc481019deeb9a8a7326b0ee6e39bb.jpg?v=1788815251","url":"https:\/\/voomisupply.com\/products\/holo-krome-64040-button-socket-cap-screw-1-4-20","provider":"Voomi Supply","version":"1.0","type":"link"}