{"product_id":"electro-hardware-s1391-m01-f21-i-circuit-board-spacer","title":"Electro Hardware S1391-M01-F21-I Circuit Board Spacer","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe ELECTRO HARDWARE S1391-M01-F21-I is a round, female unthreaded circuit board spacer designed to create precise standoff clearance between a PCB and a mounting surface. Machined from brass and finished with a zinc plating per ASTM B633, QQ-B-626 Comp 22 Type 1, this spacer delivers corrosion resistance and dimensional consistency in electronic assembly applications. It measures 1 inch overall length, 0.194 inches inside diameter, and 0.500 inches outside diameter, with an inside diameter tolerance of 0.000 to 0.010 inches and a length tolerance of -0.005 to 0.005 inches. The Number 10 screw size makes it compatible with common board-mounting hardware used in control and circuit board assemblies.\u003c\/p\u003e\n\u003cp\u003eThis spacer is suited for residential and commercial electronic control board installations, including HVAC control boards, relay panels, and general electrical enclosure assemblies. It is typically installed by HVAC technicians, electricians, and electronics assembly technicians when mounting circuit boards that require a rigid, non-conductive-style standoff gap while maintaining a secure screw engagement point. The female unthreaded body style allows a fastener to pass through cleanly, clamping the board at the correct standoff height without threading into the spacer body itself.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eBrass construction with zinc plating per ASTM B633 and QQ-B-626 Comp 22 Type 1 for corrosion resistance\u003c\/li\u003e\n  \u003cli\u003eFemale unthreaded body accepts Number 10 screw hardware for secure board mounting\u003c\/li\u003e\n  \u003cli\u003e1 inch overall length provides consistent PCB standoff height\u003c\/li\u003e\n  \u003cli\u003e0.500 inches outside diameter with 0.194 inches inside diameter for precise fitment\u003c\/li\u003e\n  \u003cli\u003eTight length tolerance of -0.005 to 0.005 inches ensures uniform stack height across multiple spacers\u003c\/li\u003e\n  \u003cli\u003eRound body shape for straightforward installation in standard PCB mounting holes\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 assemblies requiring a Number 10 screw, 1 inch standoff height, and a 0.500 inch outside diameter round brass spacer.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is typically performed by HVAC technicians or electricians during control board replacement or new panel assembly. De-energize all power to the control panel or enclosure before handling circuit boards or mounting hardware. Use appropriately sized Number 10 fasteners and a standard screwdriver or nut driver to seat the spacer without overtightening, which can crack board substrate. 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\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: Number 10\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 1 inch\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: 0.194 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: 0.500 inches\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\u003eFastener Standard\u003c\/strong\u003e: ASTM B633, QQ-B-626 Comp 22 Type 1\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: S1391-M01-F21-I\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ELECTRO HARDWARE","offers":[{"title":"Default Title","offer_id":51744034849074,"sku":"S1391-M01-F21-I","price":14.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/64ed36ec3a1c33caaf172ec4e8fe95b6_0faef27b-582b-4b3c-8145-2eda74284de5.jpg?v=1788853312","url":"https:\/\/voomisupply.com\/products\/electro-hardware-s1391-m01-f21-i-circuit-board-spacer","provider":"Voomi Supply","version":"1.0","type":"link"}