{"product_id":"holo-krome-73140-hex-socket-cap-screw-1-2-20-unf-alloy-steel","title":"Holo-krome 73140 Hex Socket Cap Screw 1\/2-20 Unf Alloy Steel","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe HOLO-KROME 73140 is a hex socket cap screw threaded to a 1\/2-20 UNF specification with a 2.25-inch length under head. It is partially threaded, machined from alloy steel, and finished with a black oxide coating for corrosion resistance in moderate environments. The drive is a 3\/8-inch internal hex socket, requiring an Allen or hex key for installation. This fastener meets ASME B18.3 and ASTM A574 standards, making it suitable for high-strength mechanical assemblies. Machinists, millwrights, and maintenance technicians commonly specify this type of cap screw where a flush or recessed head is needed and torque demands are high.\u003c\/p\u003e\n\u003cp\u003eThe 73140 is used in industrial machinery, HVAC equipment frames, structural assemblies, and fabricated components that require a fine-thread fastener with reliable clamping force. The 1\/2-20 UNF fine thread pitch provides greater tensile strength and improved resistance to loosening under vibration compared to coarse-thread equivalents. It is appropriate for metal-to-metal joints where precise thread engagement is required. This fastener is commonly installed during equipment assembly, field repair, or scheduled maintenance in manufacturing, mechanical contracting, and facilities environments.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e1\/2-20 UNF fine thread for high clamping force and vibration resistance\u003c\/li\u003e\n  \u003cli\u003e2.25-inch length under head with partial threading for shank-bearing applications\u003c\/li\u003e\n  \u003cli\u003e3\/8-inch hex socket drive for secure torque transfer with standard Allen tooling\u003c\/li\u003e\n  \u003cli\u003eAlloy steel construction meets ASTM A574 high-strength fastener requirements\u003c\/li\u003e\n  \u003cli\u003eBlack oxide finish provides mild corrosion resistance and reduces light reflection\u003c\/li\u003e\n  \u003cli\u003eConforms to ASME B18.3 dimensional standards\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as a standard ASME B18.3 hex socket cap screw for use in any application calling for a 1\/2-20 UNF partially threaded alloy steel socket head cap screw with a 2.25-inch length under head.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation should be performed by a qualified machinist, millwright, or mechanical technician using a calibrated torque wrench and a properly sized 3\/8-inch hex key or socket bit. Always de-energize and lock out equipment before servicing fasteners on powered machinery. Do not use impact drivers on socket cap screws unless the tool is set to a controlled torque mode, as over-torquing alloy steel fasteners can cause thread stripping or head failure. Inspect the mating threaded hole for debris or damage before installation.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 1\/2-20 UNF\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength Under Head\u003c\/strong\u003e: 2.25 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\/8 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThreading\u003c\/strong\u003e: Partially Threaded\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\u003eFastener Standard\u003c\/strong\u003e: ASME B18.3, ASTM A574\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.16 pounds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUNSPSC Code\u003c\/strong\u003e: 31161501\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: HOLO-KROME\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 73140\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"HOLO-KROME","offers":[{"title":"Default Title","offer_id":51742792188210,"sku":"73140","price":4519.36,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/46bdb172f20df30d7449bc2fbbf5ce52.jpg?v=1788839427","url":"https:\/\/voomisupply.com\/products\/holo-krome-73140-hex-socket-cap-screw-1-2-20-unf-alloy-steel","provider":"Voomi Supply","version":"1.0","type":"link"}