{"product_id":"electro-hardware-1443m03f21-440-hex-standoff-4-40","title":"Electro Hardware 1443M03F21-440 Hex Standoff 4-40","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe ELECTRO HARDWARE 1443M03F21-440 is a male-female hex circuit board standoff designed to create precise spacing and secure mounting between PCBs, panels, and enclosure hardware. Machined from brass with a zinc-plated finish that meets ASTM B633 Type 1 and QQ-B-626 Comp 22 standards, this standoff delivers corrosion resistance appropriate for electronics enclosures, control panels, and industrial assemblies. The hex body measures 0.25 inches across flats and provides a wrench-flat grip for controlled torque during installation. Overall length is 15\/16 inch (0.9375 inches), with a body length of 3\/4 inch and a thread length of 3\/16 inch. Thread size is 4-40, a standard used widely in low-voltage control boards and PCB stacking applications.\u003c\/p\u003e\n\u003cp\u003eThis standoff is suited for use in residential and commercial control panels, HVAC circuit board assemblies, electrical enclosures, and any application requiring a rigid, threaded spacer between stacked PCBs or a board and a mounting surface. Electricians, electronics technicians, and HVAC service professionals typically install these standoffs when mounting or replacing control boards inside equipment enclosures. The male-female thread configuration allows daisy-chaining or single-layer PCB mounting depending on the assembly requirement.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eMale-female hex body design for stackable or single-layer PCB mounting\u003c\/li\u003e\n  \u003cli\u003e4-40 thread size compatible with standard PCB and panel hardware\u003c\/li\u003e\n  \u003cli\u003eBrass construction with zinc-plated finish per ASTM B633 Type 1 and QQ-B-626 Comp 22\u003c\/li\u003e\n  \u003cli\u003eHex body profile (0.25 inches across flats) accepts standard nut drivers and wrenches\u003c\/li\u003e\n  \u003cli\u003eLength tolerance of -0.005 to 0.005 inches for precise board spacing\u003c\/li\u003e\n  \u003cli\u003eInch measurement system; overall length 15\/16 inch (0.9375 inches)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as a standard 4-40 male-female hex standoff for use with circuit boards, electrical panels, and enclosures that require inch-series threaded hardware. Verify thread engagement depth and overall standoff length against your specific PCB and enclosure tolerances before installation.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstall and remove this standoff using a properly sized nut driver or hex wrench matched to the 0.25-inch across-flats hex body. Always de-energize and discharge any control board or panel before working in the enclosure. Avoid over-torquing, as brass hardware is subject to thread damage if excessive force is applied. Follow applicable NEC requirements and equipment manufacturer guidelines when mounting or replacing circuit boards inside energized enclosures.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Type\u003c\/strong\u003e: Male\/Female\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 4-40\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 0.9375 inches (15\/16 inch)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBody Length\u003c\/strong\u003e: 0.75 inches (3\/4 inch)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Length\u003c\/strong\u003e: 3\/16 inch\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Depth\u003c\/strong\u003e: 1\/4 inch\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWidth Across Flats\u003c\/strong\u003e: 0.25 inches (1\/4 inch)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBody Shape\u003c\/strong\u003e: Hex\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Brass\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFinish\u003c\/strong\u003e: Zinc-Plated\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength Tolerance\u003c\/strong\u003e: -0.005 to 0.005 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStandards\u003c\/strong\u003e: ASTM B633 Type 1, QQ-B-626 Comp 22\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSystem of Measurement\u003c\/strong\u003e: Inch\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: ELECTRO HARDWARE\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 1443M03F21-440\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ELECTRO HARDWARE","offers":[{"title":"Default Title","offer_id":51728860053810,"sku":"1443M03F21-440","price":14.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/354e84e78593c87d91054c55b2ccfd1d_7c165e3d-6c08-4423-913f-2119a3d8bf9e.jpg?v=1788697016","url":"https:\/\/voomisupply.com\/products\/electro-hardware-1443m03f21-440-hex-standoff-4-40","provider":"Voomi Supply","version":"1.0","type":"link"}