{"product_id":"electro-hardware-s517-m10-f21-h-round-board-spacer-5-16in","title":"Electro Hardware S517-M10-F21-H Round Board Spacer 5\/16in","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe ELECTRO HARDWARE S517-M10-F21-H is a round, female unthreaded circuit board spacer designed to create precise standoff clearance between a PCB and its mounting surface. Constructed from Grade 2 steel with a zinc-plated finish meeting ASTM B633 and QQ-S-633 Type 1 standards, this spacer provides reliable corrosion resistance and dimensional consistency. It accepts a Number 8 screw, measures 0.3125 inches overall length, 0.25 inches outside diameter, and 0.171 inches inside diameter. Electronics technicians, HVAC controls installers, and electrical panel assemblers use this type of hardware when mounting control boards in equipment enclosures.\u003c\/p\u003e\n\u003cp\u003eThis spacer is suited for use in residential and commercial electronic assemblies where a consistent standoff gap is required between a circuit board and a chassis or sub-panel. Typical applications include control board mounting in HVAC units, electrical enclosures, and industrial control panels. The female unthreaded design accepts a Number 8 fastener passed through the board and into the spacer body, allowing the board to sit at a fixed, repeatable height above the mounting surface.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eFemale unthreaded body accepts Number 8 screws for straightforward board mounting\u003c\/li\u003e\n  \u003cli\u003eGrade 2 steel construction with zinc-plated finish per ASTM B633 and QQ-S-633 Type 1\u003c\/li\u003e\n  \u003cli\u003eOverall length of 0.3125 inches with a tight length tolerance of -0.005 to 0.005 inches\u003c\/li\u003e\n  \u003cli\u003eInside diameter of 0.171 inches with tolerance of 0.000 to 0.010 inches for consistent fit\u003c\/li\u003e\n  \u003cli\u003eRound body shape with 0.25 inches outside diameter for compact footprint on crowded boards\u003c\/li\u003e\n  \u003cli\u003eInch system of measurement for direct compatibility with standard US fastener layouts\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style replacement or new-installation spacer for circuit board mounting applications requiring a Number 8 screw, 0.3125-inch standoff height, and a female unthreaded round body in inch dimensions.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is performed by electronics technicians or qualified electricians during control board assembly or replacement. Always de-energize the equipment and discharge any stored capacitance before handling circuit boards or installing standoff hardware. Use a screwdriver or nut driver sized for the Number 8 fastener and do not overtighten, as excessive force can crack the PCB substrate or deform the spacer. Follow applicable NEC guidelines when working inside electrical enclosures.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\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\u003eFastener Standard\u003c\/strong\u003e: ASTM B633, QQ-S-633 Type 1\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eScrew Size\u003c\/strong\u003e: Number 8\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eType\u003c\/strong\u003e: Female Unthreaded\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBody Shape\u003c\/strong\u003e: Round\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 0.3125 inches\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\u003eOutside Diameter\u003c\/strong\u003e: 0.25 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInside Diameter\u003c\/strong\u003e: 0.171 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInside Diameter Tolerance\u003c\/strong\u003e: 0.000 to 0.010 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSystem of Measurement\u003c\/strong\u003e: Inch\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackage Quantity\u003c\/strong\u003e: 1\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: S517-M10-F21-H\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ELECTRO HARDWARE","offers":[{"title":"Default Title","offer_id":51739503231282,"sku":"S517-M10-F21-H","price":14.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/64ed36ec3a1c33caaf172ec4e8fe95b6_8f5f7841-3d3f-4e5e-ab5d-cc83cf6a1a1a.jpg?v=1788815332","url":"https:\/\/voomisupply.com\/products\/electro-hardware-s517-m10-f21-h-round-board-spacer-5-16in","provider":"Voomi Supply","version":"1.0","type":"link"}