Product Overview
The LM20UU is a 20mm linear bearing designed for smooth, low-friction reciprocating motion along precision linear shafts. Built with bearing steel and a 5-row ball circuit, this lm20uu linear bearing delivers consistent performance across high-cycle automation environments. Standardized LM series dimensions ensure direct interchangeability with industry-compatible housings and shaft systems. For complete linear motion assemblies, the LM20UU 20mm linear ball bearing pairs directly with SCS20UU, SCJ20UU, and SBR20 housing systems.
Key Specifications
Product drawing
| Parameter | Value | Parameter | Value |
|---|---|---|---|
Model | LM20UU | Model | LM20UU |
Shaft Diameter | 20mm | Shaft Diameter | 20mm |
Outer Diameter (D) | 32mm | Outer Diameter (D) | 32mm |
Ball Rows | 5 | Ball Rows | 5 |
Weight | 87g | Weight | 87g |
Material | Bearing Steel | Material | Bearing Steel |
Bore Tolerance | 0 / -8 μm | Bore Tolerance | 0 / -8 μm |
Outer Diameter Tolerance | 0 / -10 μm (P+H) | Outer Diameter Tolerance | 0 / -10 μm (P+H) |
Adjustable Type | LM20UUAJ | Adjustable Type | LM20UUAJ |
Open Type | LM20UUOP | Open Type | LM20UUOP |
Product Features
Low-Friction Rolling Design
The LM20UU 20mm linear bearing uses a recirculating ball circuit to minimize contact friction between shaft and housing. This reduces energy consumption and heat generation under continuous reciprocating motion.
Bearing Steel Construction
Manufactured from high-grade bearing steel with precision-ground raceway surfaces. The material hardness and surface finish directly determine the service life and load consistency of the 20mm linear ball bearing across high-cycle applications.
5-Row Ball Circuit
The LM20UU features a 5-row ball arrangement, providing balanced radial load distribution around the shaft circumference. This configuration maintains motion stability under multi-directional loading conditions.
Standardized LM Series Dimensions
As part of the LM…UU series, the LM20UU linear motion bearing conforms to standard dimensional specifications, allowing direct replacement within existing SBR20, SCJ20UU, and SCS20UU housing systems without modification.
Available Variants
- LM20UU - standard closed type
- LM20UUOP - open type for shaft access
- LM20UUAJ - adjustable clearance type
LM20UU 20mm Linear Bearing – Applications
The lm20uu linear bearing is used across a wide range of industrial and automation equipment:
CNC machine tool axis guidance
Automated packaging and conveying lines
3D printer and laser cutter linear motion systems
Textile and printing machinery
Chemical and medical equipment
Pick-and-place robotic systems
Electronic manufacturing equipment
Why Source LM20UU from SQ Bearing
Zhejiang SQ Bearing Manufacturing Co., Ltd. has manufactured linear motion bearings and components since 2007, with over 17 years of production experience in the LM…UU series. The facility covers 19,800㎡ and operates more than 100 CNC and precision grinding machines, including the centerless grinding and fine polishing equipment critical to linear bearing bore and OD accuracy.
Start SQ Factory 360° VR Tour
Every LM20UU linear bearing is produced under ISO 9001 certified quality management. ROHS and REACH compliance is maintained across all bearing materials and surface treatments. In-process inspection covers incoming steel, machining tolerances, ball circuit assembly, and final dimensional verification. SQ Bearing holds self-operated export rights, with active customers across Southeast Asia, the Middle East, Europe, and South America.
OEM packaging, custom labeling, and small-quantity sample orders are accepted.
FAQ
Q: What is the shaft diameter for LM20UU?
A: The LM20UU is designed for 20mm precision linear shafts. Outer diameter is 32mm. It is not interchangeable with LM16UU (16mm) or LM25UU (25mm) housings. For shaft-and-bearing assembly, pair with a compatible 20mm linear ball bearing housing such as SCS20UU or SCJ20UU.
Q: What is the difference between LM20UU, LM20UUOP, and LM20UUAJ?
A: LM20UU is the standard closed type. LM20UUOP has an open slot along the outer shell for side-shaft access. LM20UUAJ features an adjustable clearance mechanism for applications requiring preload control.
Q: Is the LM20UU RoHS and REACH compliant?
A: Yes. SQ Bearing's LM20UU linear motion bearing is produced under ROHS and REACH certification, covering bearing steel composition and surface treatment materials.
Q: What is the minimum order quantity?
A: MOQ is 1 piece. Stock is maintained for small-quantity and sample orders with short lead times. For full container orders, standard lead time is 15–20 days.
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