{"product_id":"electro-hardware-mmf1339m03f21m3-hex-standoff-m3x0-5","title":"Electro Hardware MMF1339M03F21M3 Hex Standoff M3x0.5","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe ELECTRO HARDWARE MMF1339M03F21M3 is a male-female hex circuit board standoff designed to create fixed spacing between PCBs, enclosure panels, and mounting surfaces in electronic assemblies. Machined from brass with a zinc-plated finish meeting ASTM B633 Type 1 and QQ-B-626 Comp 22 standards, this standoff provides corrosion resistance and reliable conductivity in tight board-stack configurations. The M3 x 0.5 thread on both the male pin and female bore ensures clean engagement with standard metric hardware. The hex body measures 4.5 mm across flats, allowing installation and removal with a standard hex wrench or nut driver. Overall length is 28.76 mm with a body length of 24.00 mm.\u003c\/p\u003e\u003cp\u003eThis standoff is suited for residential and commercial electronics, control board assemblies, HVAC control panels, and industrial enclosures where PCB-to-PCB or PCB-to-chassis separation is required. Electricians, electronics technicians, and panel builders use this type of fastener when assembling or servicing multi-board stacks or securing circuit boards to back panels. The metric M3 sizing is common in OEM control board assemblies and field repair applications across a range of trade equipment.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eBrass construction with zinc-plated finish for corrosion resistance and electrical conductivity\u003c\/li\u003e\n\u003cli\u003eM3 x 0.5 thread on both male and female ends for standard metric compatibility\u003c\/li\u003e\n\u003cli\u003eHex body at 4.5 mm across flats allows wrench or nut driver installation\u003c\/li\u003e\n\u003cli\u003eOverall length of 28.76 mm with a 24.00 mm body length for defined board spacing\u003c\/li\u003e\n\u003cli\u003eMeets ASTM B633 Type 1 and QQ-B-626 Comp 22 finish standards\u003c\/li\u003e\n\u003cli\u003eLength tolerance of -0.150 to 0.150 mm for consistent stack height\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style replacement or new-installation standoff for metric M3 x 0.5 circuit board mounting applications in electronic assemblies, control panels, and enclosures.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation is typically performed by an electronics technician or electrician during board assembly or service. De-energize and discharge all circuits before handling circuit boards or standoffs in live panels. Use a properly sized hex wrench or nut driver matched to the 4.5 mm across-flats hex body to avoid rounding the standoff. Do not overtighten, as brass fasteners in PCB applications can crack board mounting holes if excessive torque is applied.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: M3 x 0.5\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Type\u003c\/strong\u003e: Male and Female\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 28.76 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBody Length\u003c\/strong\u003e: 24.00 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Depth\u003c\/strong\u003e: 6.40 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Length\u003c\/strong\u003e: 4.76 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWidth Across Flats\u003c\/strong\u003e: 4.50 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBody Shape\u003c\/strong\u003e: Hex\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\u003eLength Tolerance\u003c\/strong\u003e: -0.150 to 0.150 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards\u003c\/strong\u003e: ASTM B633 Type 1, QQ-B-626 Comp 22\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem of Measurement\u003c\/strong\u003e: Metric\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.00888 pounds\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: MMF1339M03F21M3\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ELECTRO HARDWARE","offers":[{"title":"Default Title","offer_id":51740608069938,"sku":"MMF1339M03F21M3","price":23.37,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/c0f7b057c74799d37dbd877d4308382f.jpg?v=1788826172","url":"https:\/\/voomisupply.com\/products\/electro-hardware-mmf1339m03f21m3-hex-standoff-m3x0-5","provider":"Voomi Supply","version":"1.0","type":"link"}