{"product_id":"electro-hardware-s553-m10-f21-e-circuit-board-spacer","title":"Electro Hardware S553-M10-F21-E Circuit Board Spacer","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe ELECTRO HARDWARE S553-M10-F21-E is a round, female unthreaded circuit board spacer designed to provide consistent standoff clearance between a PCB and a mounting surface. Manufactured from Grade 2 steel with a zinc-plated finish per ASTM B633 and QQ-S-633 Type 1, this spacer delivers corrosion resistance suitable for electronics enclosures, control panels, and industrial assemblies. It measures 0.875 inches in overall length with an inside diameter of 0.116 inches and an outside diameter of 0.25 inches, sized for a No. 4 screw. HVAC controls technicians, electricians, and electronics assembly professionals install this hardware during control board mounting and enclosure fabrication.\u003c\/p\u003e\n\u003cp\u003eThis spacer is used in residential and light commercial control panel assemblies, circuit board mounting applications, and electronics enclosures where a consistent, non-threaded standoff is required. It accepts a No. 4 fastener and provides a clean female unthreaded bore for pass-through or stacking configurations. The zinc-plated steel construction makes it suitable for indoor electrical enclosures and HVAC control board installations where mild corrosion resistance is needed.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eFemale unthreaded bore accepts No. 4 screw for flexible mounting configurations\u003c\/li\u003e\n  \u003cli\u003eOverall length of 0.875 inches provides reliable PCB standoff clearance\u003c\/li\u003e\n  \u003cli\u003eInside diameter of 0.116 inches with a tolerance of 0.000 to 0.010 inches\u003c\/li\u003e\n  \u003cli\u003eOutside diameter of 0.25 inches in a round body profile\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\u003eLength tolerance held to -0.005 to 0.005 inches for consistent stack height\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 No. 4 screw, female unthreaded round standoff in inch measurement.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is performed by licensed electricians, electronics technicians, or HVAC controls professionals. De-energize and lock out the panel or control board assembly before handling any PCB hardware. Use the appropriately sized No. 4 fastener and avoid over-torquing, which can crack the board or deform the spacer. Follow applicable NEC guidelines for control panel assembly and wiring clearances.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBody Shape\u003c\/strong\u003e: Round\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eType\u003c\/strong\u003e: Female Unthreaded\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eScrew Size\u003c\/strong\u003e: No. 4\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 0.875 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInside Diameter\u003c\/strong\u003e: 0.116 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\u003eOutside Diameter\u003c\/strong\u003e: 0.25 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\u003eMaterial\u003c\/strong\u003e: Steel, 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\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: S553-M10-F21-E\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ELECTRO HARDWARE","offers":[{"title":"Default Title","offer_id":51743512953138,"sku":"S553-M10-F21-E","price":14.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/64ed36ec3a1c33caaf172ec4e8fe95b6_f8c72fe0-60b6-4541-83b4-f1167cd60dcd.jpg?v=1788847915","url":"https:\/\/voomisupply.com\/products\/electro-hardware-s553-m10-f21-e-circuit-board-spacer","provider":"Voomi Supply","version":"1.0","type":"link"}