LM12OP Open Type CNC Linear Bearing 12×21×30mm – 2pcs Pack

Kande Bearings LM12OP Open Type CNC Linear Bushing – 2-Pack

Upgrade your CNC machine, 3D printer, or linear motion system with these precision-engineered LM12OP Open Type Linear Bearings from Kande Bearings. Sold as a set of 2, these open-slot linear bushings are manufactured from high-grade bearing steel for smooth, low-friction linear travel along 12mm shafts. The open-type design allows easy installation on existing rails without full disassembly — perfect for builders, engineers, and makers who demand accuracy and reliability.

Product Specifications

• Brand: Kande Bearings (KandeBearing)
• Model: LM12OP / LM12UUOP
• Type: Open Type CNC Linear Bushing
• Material: High-Grade Bearing Steel
• Dimensions: 12 × 21 × 30 mm
• Inner Diameter: 12 mm
• Outer Diameter: 21 mm
• Width (Length): 30 mm
• Quantity: 2 pieces per pack
• Country of Origin: Made in China

Key Features

• Open-Slot Design: The open-type slot enables straightforward mounting and removal — no need to thread the shaft through the bearing from the end.
• High-Grade Bearing Steel: Precision-hardened steel construction ensures durability, dimensional accuracy, and consistent performance in demanding environments.
• Smooth Linear Motion: Ball-retainer design minimises friction and play, delivering precise, repeatable movement along 12mm guide shafts.
• Versatile Compatibility: Compatible with standard 12mm linear rods used in CNC routers, 3D printers, laser cutters, pick-and-place machines, and other automation equipment.
• Drop-In Replacement: Dimensionally equivalent to LM12UU standard bearings, making them a reliable upgrade or direct swap.

Ideal Applications

• CNC Router and Milling Machines
• FDM / Resin 3D Printers (X, Y, Z axes)
• Laser Engravers and Cutters
• Automated Pick-and-Place Systems
• Custom Linear Actuators and Slide Tables
• Robotics and DIY Motion Projects

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Frequently Asked Questions

Q: What is the difference between LM12OP and LM12UU linear bearings?

A: The LM12OP (also written LM12UUOP) is the open-type variant of the standard LM12UU linear bearing. It features a slot cut along its length, allowing it to be mounted laterally onto a shaft without threading from the end. Both share the same 12 × 21 × 30 mm dimensions and are interchangeable in most mounting blocks that support the open design.

Q: What shaft size is compatible with the LM12OP bearing?

A: The LM12OP linear bushing is designed for use with a 12mm diameter linear guide rod or shaft. Ensure your rods are ground to a smooth h6 or h7 tolerance for optimal performance and longevity.

Q: Are these bearings suitable for use in 3D printers?

A: Yes. The LM12OP open-type CNC linear bushing is fully compatible with 3D printer frames that use 12mm linear rods — including many popular CoreXY and Cartesian printers. The open-slot design can simplify installation in certain carriage configurations.

Q: How many bearings are included in a single order?

A: Each order includes 2 pieces of the LM12OP open-type linear bearing, enough for a single axis or complementary pair in your build.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.