{"product_id":"holo-krome-86154-hex-socket-cap-screw-4-40-unc-alloy-steel","title":"Holo-krome 86154 Hex Socket Cap Screw 4-40 Unc Alloy Steel","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe HOLO-KROME 86154 is a hex socket cap screw designed for precision fastening applications requiring a compact, high-strength connection. Threaded 4-40 UNC and fully threaded along its 5\/16-inch length under head, this screw accepts a 3\/32-inch hex drive. It is manufactured from alloy steel and finished with a black oxide coating that provides mild corrosion resistance and a low-reflectance appearance. The black oxide finish also helps retain lubricants applied during assembly. This screw meets ASME B18.3 and ASTM A574 standards, making it suitable for applications where dimensional and mechanical consistency is required. Machinists, maintenance technicians, and assembly professionals routinely install this fastener type.\u003c\/p\u003e\u003cp\u003eThis screw is suited for light-duty mechanical assemblies, instrument panels, electronics enclosures, and small machine components where a low-profile socket head is preferred over a hex bolt or pan-head screw. The 4-40 UNC thread is a fine-pitch coarse series commonly found in precision equipment, fixtures, and small-bore tapped holes. Its compact drive size and fully threaded shank make it a practical choice for tight clearances and shallow-depth tapped holes in metal components.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e4-40 UNC thread for precision mechanical assemblies and small-bore applications\u003c\/li\u003e\n\u003cli\u003eFully threaded along the 5\/16-inch length under head for maximum thread engagement\u003c\/li\u003e\n\u003cli\u003e3\/32-inch hex socket drive for use with standard Allen or hex-key tools\u003c\/li\u003e\n\u003cli\u003eAlloy steel construction meets ASTM A574 mechanical requirements\u003c\/li\u003e\n\u003cli\u003eBlack oxide finish provides mild corrosion resistance and lubricant retention\u003c\/li\u003e\n\u003cli\u003eConforms to ASME B18.3 dimensional standards\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a standard ASME B18.3 hex socket cap screw for use in any application requiring a 4-40 UNC fully threaded fastener with a 3\/32-inch hex drive.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation requires a 3\/32-inch hex key or Allen-drive bit. Ensure the tapped hole is clean and free of debris before driving the screw to avoid cross-threading. Do not exceed the rated torque range for 4-40 alloy steel fasteners as specified by the assembly designer or applicable engineering standard. Always verify thread engagement depth is sufficient before applying load.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 4-40 UNC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength Under Head\u003c\/strong\u003e: 5\/16 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThreading\u003c\/strong\u003e: Fully Threaded\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\/32 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\u003eStandards\u003c\/strong\u003e: ASME B18.3, ASTM A574\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUNSPSC Code\u003c\/strong\u003e: 31161501\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.001 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: 86154\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"HOLO-KROME","offers":[{"title":"Default Title","offer_id":51740528804146,"sku":"86154","price":5330.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/3e752c123879d7a9b251683aa6d5e8b5.jpg?v=1788825711","url":"https:\/\/voomisupply.com\/products\/holo-krome-86154-hex-socket-cap-screw-4-40-unc-alloy-steel","provider":"Voomi Supply","version":"1.0","type":"link"}