20pcs Eccentric Spacer Nuts 5mm Bore for 3D Printer & CNC

20-Pack Eccentric Spacer Nuts – Precision V-Wheel Adjustment for 3D Printers & CNC Machines

Keep your 3D printer and CNC engraver running smoothly with these Eccentric Spacer Nuts. 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.

Why Choose These Eccentric Nuts?

• Precision Fit: 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.
• Nickel-Plated Carbon Steel: Constructed from carbon steel with a nickel plating finish, these spacers resist corrosion and wear, ensuring long-lasting durability in continuous-use environments.
• Easy V-Wheel Tensioning: 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.
• Wide Compatibility: 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.
• 20-Piece Value Set: A generous quantity means you have plenty of spares on hand for replacements, upgrades, or multi-machine setups — no need to reorder frequently.
• Silver Finish: Clean, professional-looking silver color that blends neatly with standard aluminum extrusion hardware.

Specifications

Package Contents

• 20 × Eccentric Spacer Nuts (5mm bore)

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External Resource

For best practices in precision measurement and hardware standards, refer to the NIST Precision Measurement Standards.

Note: Actual color may vary slightly from images due to monitor settings and lighting conditions. Please allow ±0.1mm tolerance for manual measurements.

Learn more: Nut

Frequently Asked Questions

Q: What 3D printers are these 5mm eccentric spacer nuts compatible with?

A: 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.

Q: How do eccentric spacer nuts improve 3D printer performance?

A: 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.

Q: Are these eccentric nuts the same as regular hex nuts?

A: 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.

Q: Why is the 20-piece set a good choice?

A: 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.