{"product_id":"electro-hardware-p553m10f21-440-female-standoff-4-40","title":"Electro Hardware P553M10F21-440 Female Standoff 4-40","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe ELECTRO HARDWARE P553M10F21-440 is a round female standoff designed for use in precision fastening applications where consistent spacing and thread engagement are critical. This fully threaded standoff features a 4-40 thread size, an overall length of 0.875 inches, and an outside diameter of 0.25 inches. Constructed from Grade 2 steel with a zinc-plated finish, it meets ASTM B633 Type 1 and QQ-S-633 standards for corrosion resistance. The fully threaded interior accommodates a thread depth of 1 inch, providing reliable thread engagement across a range of panel thicknesses. Electricians, electronics assemblers, and panel fabricators commonly use this type of standoff in control panels, enclosures, and circuit board mounting assemblies.\u003c\/p\u003e\u003cp\u003eThis standoff is suited for light-duty to medium-duty panel and PCB mounting tasks in electrical enclosures, control cabinets, and equipment chassis. The inch-system dimensions make it compatible with standard 4-40 fastener hardware widely used in domestic electrical and electronics assembly work. Its compact 0.25-inch outside diameter fits applications where space between mounting points is limited. The zinc-plated finish provides surface protection appropriate for indoor and sheltered environments.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eFully threaded female interior with 4-40 thread size for standard fastener compatibility\u003c\/li\u003e\n\u003cli\u003e0.875-inch overall length with a length tolerance of -0.005 to 0.005 inches for precision fitment\u003c\/li\u003e\n\u003cli\u003e0.25-inch outside diameter suits tight-clearance panel and PCB mounting applications\u003c\/li\u003e\n\u003cli\u003eGrade 2 steel construction provides reliable mechanical strength for general fastening use\u003c\/li\u003e\n\u003cli\u003eZinc-plated finish meets ASTM B633 Type 1 and QQ-S-633 corrosion-resistance standards\u003c\/li\u003e\n\u003cli\u003eRound body shape allows installation with standard hex or knurled drivers\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a standard-dimension replacement or new-install female standoff for applications using 4-40 inch-series threaded hardware in electrical enclosures, control panels, and electronics chassis assemblies.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstall and remove female standoffs using appropriately sized drivers or nut drivers to avoid deforming the body or cross-threading the interior. Always de-energize and lock out the equipment before working inside control panels or enclosures per applicable NFPA 70 lockout-tagout procedures. Do not overtighten mating fasteners, as the 4-40 thread is a fine, small-diameter thread susceptible to stripping under excessive torque. Inspect threads before installation to confirm they are clean and free of debris.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Type\u003c\/strong\u003e: 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: 0.875 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter\u003c\/strong\u003e: 0.25 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Depth\u003c\/strong\u003e: 1 inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBody Shape\u003c\/strong\u003e: Round\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial Grade\u003c\/strong\u003e: Grade 2\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-S-633\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem of Measurement\u003c\/strong\u003e: Inch\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\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: P553M10F21-440\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ELECTRO HARDWARE","offers":[{"title":"Default Title","offer_id":51742128308530,"sku":"P553M10F21-440","price":18.3,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/24a5d05114a707e7b06a2620b31fbd67_4fcae60f-9b5c-4150-8882-265aae1e03b3.jpg?v=1788835438","url":"https:\/\/voomisupply.com\/products\/electro-hardware-p553m10f21-440-female-standoff-4-40","provider":"Voomi Supply","version":"1.0","type":"link"}