{"product_id":"electro-hardware-s1375-m10-f21-k-circuit-board-spacer","title":"Electro Hardware S1375-M10-F21-K Circuit Board Spacer","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe ELECTRO HARDWARE S1375-M10-F21-K is a round, female unthreaded circuit board spacer manufactured from Grade 2 steel with a zinc-plated finish. It provides a fixed standoff between a circuit board and a mounting surface, maintaining clearance for airflow and preventing electrical contact. The spacer measures 0.75 inches overall length with a 0.5 inch outside diameter and a 0.257 inch inside diameter, sized to accept a 1\/4 inch screw. Electrical and electronics technicians use this fastener hardware during PCB installation and service work in HVAC controls, industrial panels, and similar enclosures.\u003c\/p\u003e\u003cp\u003eThis spacer is suited for residential and commercial applications wherever printed circuit boards require a secure, fixed standoff from a chassis or DIN rail mounting plate. Typical install scenarios include HVAC control board mounting, electrical enclosure PCB assemblies, and industrial electronics chassis work. The zinc-plated steel construction handles indoor environments where moderate corrosion resistance is needed without the cost of stainless fasteners.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eFemale unthreaded body accepts a 1\/4 inch screw for straightforward PCB mounting\u003c\/li\u003e\n\u003cli\u003eOverall length of 0.75 inches provides consistent board standoff clearance\u003c\/li\u003e\n\u003cli\u003eGrade 2 steel construction meets ASTM B633 and QQ-S-633 Type 1 standards\u003c\/li\u003e\n\u003cli\u003eZinc-plated finish delivers moderate corrosion resistance for indoor panel use\u003c\/li\u003e\n\u003cli\u003eInside diameter tolerance of 0.000 to 0.010 inches ensures consistent screw fit\u003c\/li\u003e\n\u003cli\u003eLength tolerance of -0.005 to 0.005 inches for precise, repeatable stack height\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style replacement or new-installation spacer for circuit board mounting applications requiring a 1\/4 inch screw size, 0.75 inch standoff height, and 0.5 inch outside diameter round body in inch-measurement fastener systems.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation is typically performed by licensed electricians or qualified electronics technicians working on control panels and PCB assemblies. Always de-energize the equipment and follow applicable NFPA 70 (NEC) lockout\/tagout procedures before servicing any control board or panel. Use the appropriate screwdriver or nut driver for the 1\/4 inch screw to avoid damaging the unthreaded spacer body. Do not over-torque the mating fastener, as the unthreaded bore does not provide thread engagement and relies on the screw head and mating hardware for clamping force.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\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\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: 1\/4 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 0.75 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter\u003c\/strong\u003e: 0.5 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter\u003c\/strong\u003e: 0.257 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\u003eLength Tolerance\u003c\/strong\u003e: -0.005 to 0.005 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFastener Standards\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\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: S1375-M10-F21-K\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ELECTRO HARDWARE","offers":[{"title":"Default Title","offer_id":51740140667186,"sku":"S1375-M10-F21-K","price":14.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/0d2ca5ec067f013ce61632b50d6e2cdc.jpg?v=1788822813","url":"https:\/\/voomisupply.com\/products\/electro-hardware-s1375-m10-f21-k-circuit-board-spacer","provider":"Voomi Supply","version":"1.0","type":"link"}