{"product_id":"20pcs-eccentric-spacer-nuts-5mm-bore-3d-printer-cnc-openbuilds","title":"20pcs Eccentric Spacer Nuts 5mm Bore for 3D Printer \u0026 CNC","description":"\n\u003ch2\u003e20-Pack Eccentric Spacer Nuts – Precision V-Wheel Adjustment for 3D Printers \u0026amp; CNC Machines\u003c\/h2\u003e\n\u003cp\u003eKeep your 3D printer and CNC engraver running smoothly with these \u003cstrong\u003eEccentric Spacer Nuts\u003c\/strong\u003e. Designed as direct drop-in OpenBuilds-compatible hardware, this 20-piece set gives you everything you need to fine-tune V-wheel tension, eliminate unwanted play in your gantry, and maintain precise axis alignment — all in one convenient pack.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Choose These Eccentric Nuts?\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePrecision Fit:\u003c\/strong\u003e Each nut features a 5mm inner bore, 10mm outer diameter, and 6mm height — exact dimensions for a secure, wobble-free fit in standard OpenBuilds-style frames and most 3D printer gantry systems.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNickel-Plated Carbon Steel:\u003c\/strong\u003e Constructed from carbon steel with a nickel plating finish, these spacers resist corrosion and wear, ensuring long-lasting durability in continuous-use environments.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEasy V-Wheel Tensioning:\u003c\/strong\u003e The off-center bore design allows you to rotate the nut and micro-adjust wheel pressure against extrusion rails — eliminating slop and improving print quality with minimal effort.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Compatibility:\u003c\/strong\u003e Fits most printers with 5mm mounting holes including OpenBuilds ACRO, WorkBee, OX, and similar gantry-based CNC and 3D printer systems. Also compatible with belt-driven engraving machines.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e20-Piece Value Set:\u003c\/strong\u003e A generous quantity means you have plenty of spares on hand for replacements, upgrades, or multi-machine setups — no need to reorder frequently.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSilver Finish:\u003c\/strong\u003e Clean, professional-looking silver color that blends neatly with standard aluminum extrusion hardware.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePart Name\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEccentric Spacer Nut\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCarbon Steel with Nickel Plating\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInner Diameter (Bore)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOuter Diameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e10mm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eHeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e6mm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eColor\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSilver\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eQuantity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e20 pieces\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCountry of Origin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMade in China\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003ePackage Contents\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e20 × Eccentric Spacer Nuts (5mm bore)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated Products You May Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1-channel-relay-module-dc-3-3v-24v-optocoupler-arduino\"\u003e1-Channel Relay Module DC 3.3V–24V Optocoupler for Arduino\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/0-25mm-1000-turn-precision-copper-inductor-coil-diy-electronics\"\u003e0.25mm 1000-Turn Precision Copper Inductor Coil for DIY Circuits\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eExternal Resource\u003c\/h3\u003e\n\u003cp\u003eFor best practices in precision measurement and hardware standards, refer to the NIST Precision Measurement Standards.\u003c\/p\u003e\n\n\u003cp\u003e\u003cem\u003eNote: Actual color may vary slightly from images due to monitor settings and lighting conditions. Please allow ±0.1mm tolerance for manual measurements.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/en.wikipedia.org\/wiki\/Nut\" target=\"_blank\" rel=\"noopener\"\u003eNut\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What 3D printers are these 5mm eccentric spacer nuts compatible with?\u003c\/h4\u003e\n\u003cp\u003eA: These eccentric spacer nuts are compatible with most OpenBuilds-based 3D printers and CNC machines that use 5mm mounting holes, including OpenBuilds ACRO, WorkBee, OX systems, and similar belt-driven or V-wheel gantry designs. They are also suitable for many popular FDM 3D printer frames with standard V-slot extrusion rails.\u003c\/p\u003e\n\n\u003ch4\u003eQ: How do eccentric spacer nuts improve 3D printer performance?\u003c\/h4\u003e\n\u003cp\u003eA: Eccentric spacer nuts have an off-center (eccentric) bore, meaning the hole is not perfectly centered in the nut body. By rotating the nut, you can increase or decrease the pressure of the V-wheels against the extrusion rail, eliminating unwanted wobble or play in the gantry. This leads to more consistent layer adhesion, improved dimensional accuracy, and smoother overall print movement.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Are these eccentric nuts the same as regular hex nuts?\u003c\/h4\u003e\n\u003cp\u003eA: No. Unlike standard hex nuts, eccentric spacer nuts have a deliberately off-center bore. This unique design is specifically engineered for V-wheel tension adjustment on linear motion systems like those found in 3D printers and CNC routers — they are not interchangeable with ordinary fastener nuts.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Why is the 20-piece set a good choice?\u003c\/h4\u003e\n\u003cp\u003eA: Most 3D printer builds require 4–8 eccentric nuts depending on the design, so a 20-piece set gives you enough for a complete build plus spares for maintenance or future upgrades. Having extras on hand prevents downtime caused by lost or worn-out hardware.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What 3D printers are these 5mm eccentric spacer nuts compatible with?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"These eccentric spacer nuts are compatible with most OpenBuilds-based 3D printers and CNC machines that use 5mm mounting holes, including OpenBuilds ACRO, WorkBee, OX systems, and similar belt-driven or V-wheel gantry designs. They are also suitable for many popular FDM 3D printer frames with standard V-slot extrusion rails.\"}}, {\"@type\": \"Question\", \"name\": \"How do eccentric spacer nuts improve 3D printer performance?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Eccentric spacer nuts have an off-center (eccentric) bore, meaning the hole is not perfectly centered in the nut body. By rotating the nut, you can increase or decrease the pressure of the V-wheels against the extrusion rail, eliminating unwanted wobble or play in the gantry. This leads to more consistent layer adhesion, improved dimensional accuracy, and smoother overall print movement.\"}}, {\"@type\": \"Question\", \"name\": \"Are these eccentric nuts the same as regular hex nuts?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"No. Unlike standard hex nuts, eccentric spacer nuts have a deliberately off-center bore. This unique design is specifically engineered for V-wheel tension adjustment on linear motion systems like those found in 3D printers and CNC routers — they are not interchangeable with ordinary fastener nuts.\"}}, {\"@type\": \"Question\", \"name\": \"Why is the 20-piece set a good choice?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Most 3D printer builds require 4–8 eccentric nuts depending on the design, so a 20-piece set gives you enough for a complete build plus spares for maintenance or future upgrades. 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