{"product_id":"holo-krome-64002-button-socket-cap-screw-4-40-1-4-in","title":"Holo-krome 64002 Button Socket Cap Screw 4-40 1\/4 in","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe HOLO-KROME 64002 is a 4-40 button socket cap screw designed for applications requiring a low-profile head with reliable clamping force. It features a hex socket drive sized at 1\/16 inch and a fully threaded shank measuring 1\/4 inch under the head. Made from alloy steel with a black oxide finish, this fastener meets ANSI\/ASME B18.3 and ASTM F835 standards. The 3A thread fit class and right-hand UNC thread form ensure consistent, predictable engagement. With a hardness rating of 38 HRC, it delivers the shear and tensile strength that precision assembly and mechanical sub-assemblies demand.\u003c\/p\u003e\u003cp\u003eThis screw is suited for machine assembly, fixture building, electronics enclosures, and light structural applications where a flush, rounded head profile is preferred over a standard hex cap. The small 4-40 thread size makes it a common choice in instrumentation, panel fabrication, and tight-clearance assemblies. Licensed machinists, millwrights, and precision assembly technicians are the typical installers. The black oxide finish provides mild corrosion resistance and reduces light reflection in optical or electronic assemblies.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eButton head profile reduces snag risk and provides a clean low-profile appearance in finished assemblies\u003c\/li\u003e\n\u003cli\u003e1\/16 inch hex socket drive for precise torque application in confined spaces\u003c\/li\u003e\n\u003cli\u003eAlloy steel construction with 38 HRC hardness for high shear and tensile strength\u003c\/li\u003e\n\u003cli\u003eBlack oxide finish offers mild corrosion resistance and a non-reflective surface\u003c\/li\u003e\n\u003cli\u003eFully threaded 4-40 UNC shank with 3A thread fit class for consistent engagement\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 an OEM-style replacement or standard-stock button socket cap screw for any 4-40 UNC tapped hole application requiring an ANSI\/ASME B18.3 compliant fastener.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstall using a calibrated 1\/16 inch hex key or hex socket bit driver. Ensure the mating tapped hole is clean and free of debris before threading. Do not exceed the torque capacity appropriate for the 4-40 thread size and alloy steel grade. Follow applicable ASME or equipment manufacturer torque guidelines for the assembly.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 4-40\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\u003eLength Under Head\u003c\/strong\u003e: 0.25 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHead Type\u003c\/strong\u003e: Button\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHead Diameter\u003c\/strong\u003e: 0.2130 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHead Height\u003c\/strong\u003e: 0.0590 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: 1\/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\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\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.0002 pounds\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: 64002\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"HOLO-KROME","offers":[{"title":"Default Title","offer_id":51739796504882,"sku":"64002","price":3587.15,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/4e85b342c53e87a20967c537431bd16d.jpg?v=1788818951","url":"https:\/\/voomisupply.com\/products\/holo-krome-64002-button-socket-cap-screw-4-40-1-4-in","provider":"Voomi Supply","version":"1.0","type":"link"}