{"product_id":"electro-hardware-s797-m10-f21-h-circuit-board-spacer","title":"Electro Hardware S797-M10-F21-H Circuit Board Spacer","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe ELECTRO HARDWARE S797-M10-F21-H is a round, female unthreaded circuit board spacer designed to create a fixed standoff distance between a printed circuit board and a mounting surface. Machined from Grade 2 steel with a zinc-plated finish per ASTM B633 and QQ-S-633 Type 1, this spacer provides corrosion resistance suitable for indoor electronic assemblies. It is sized for No. 8 screws, with an overall length of 0.3125 inches, an inside diameter of 0.171 inches, and an outside diameter of 0.3125 inches. Electronics technicians, control board assemblers, and HVAC service technicians who replace or mount circuit boards use this type of hardware during board installation and panel assembly work.\u003c\/p\u003e\u003cp\u003eThis spacer is suited for use in residential and light commercial electronic control assemblies where a No. 8 fastener is specified. Typical applications include mounting HVAC control boards, relay boards, and general-purpose PCBs to metal or composite panels. Its compact 5\/16-inch profile keeps board clearance tight while maintaining consistent standoff height across multiple mounting points. The female unthreaded design accepts a No. 8 screw passed through from the board side, seating the spacer against the substrate.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eFemale unthreaded round body accepts No. 8 screws for straightforward PCB mounting\u003c\/li\u003e\n\u003cli\u003eZinc-plated steel finish per ASTM B633 and QQ-S-633 Type 1 for corrosion resistance\u003c\/li\u003e\n\u003cli\u003eGrade 2 steel construction provides reliable mechanical strength at a compact size\u003c\/li\u003e\n\u003cli\u003eOverall length of 0.3125 inches with a length tolerance of -0.005 to 0.005 inches for consistent standoff height\u003c\/li\u003e\n\u003cli\u003eInside diameter tolerance of 0.000 to 0.010 inches ensures proper fastener fit\u003c\/li\u003e\n\u003cli\u003eRound body shape allows uniform seating against board and panel surfaces\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style replacement or service spacer for circuit board mounting applications requiring a No. 8 unthreaded female round spacer with a 5\/16-inch overall length.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation is performed by electronics technicians or HVAC service professionals during control board replacement or panel assembly. Power down and de-energize any control circuit or panel completely before servicing circuit board hardware. Use a calibrated torque driver appropriate for No. 8 fasteners to avoid over-stressing the unthreaded bore. Verify spacer seating is flush against both the mounting surface and board before applying final fastener load.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\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: No. 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\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\u003eOutside Diameter\u003c\/strong\u003e: 0.3125 inches\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: S797-M10-F21-H\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ELECTRO HARDWARE","offers":[{"title":"Default Title","offer_id":51743882412338,"sku":"S797-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_d97f527a-0414-40f0-a540-b0077369982d.jpg?v=1788850721","url":"https:\/\/voomisupply.com\/products\/electro-hardware-s797-m10-f21-h-circuit-board-spacer","provider":"Voomi Supply","version":"1.0","type":"link"}