Product Overview
The LM30UU is a 30mm linear bushing engineered for smooth, low-friction reciprocating motion along hardened precision shafts. As a 30 linear bearing within the standardized LM…UU series, the LM30UU delivers consistent radial load performance across demanding automation and industrial motion applications. Its 6-row ball circuit and bearing steel construction make this 30mm LM bushing a reliable choice for medium-to-heavy load linear axis configurations.
Procurement teams searching for a 30 liner bushing for standard shaft guidance applications will find the LM30UU dimensionally equivalent to THK LM30UU and Misumi LMUU30 specifications, allowing direct replacement in existing equipment designs without housing modification. Standardized outer dimensions allow direct drop-in compatibility with SCS30UU and SCJ30UU housing systems.
Key Specifications
| Parameter | Value |
|---|---|
| Model | LM30UU |
| Shaft Diameter (dr) | 30mm |
| Outer Diameter (D) | 45mm |
| Length (L) | 64mm |
| B (retainer length) | 44.5mm |
| W | 1.85mm |
| D₁ | 43mm |
| Ball Rows | 6 |
| Weight | 250g |
| Material | Bearing Steel |
| Bore Tolerance (Precision P) | 0 / −7 μm |
| Bore Tolerance (Standard) | 0 / −10 μm |
| OD Tolerance (P·H) | 0 / −16 μm |
| Radial Clearance (max) | −8 μm |
| Dynamic Load Rating (Cₙ) | 1,570 N |
| Static Load Rating (C₀ₙ) | 2,750 N |
| Adjustable Type | LM30UUAJ (clearance: 245 gf) |
| Open Type | LM30UUOP |
Product Features
6-Row Ball Circuit for Higher Load Capacity
The LM30UU linear bushing features a 6-row recirculating ball circuit, delivering a dynamic load rating of 1,570 N and static rating of 2,750 N. This ball row configuration supports medium-to-heavy radial loads and multi-directional loading conditions common in 30mm shaft axis applications.
Bearing Steel with Precision-Ground Bore
The 30 LM bushing is manufactured from high-grade bearing steel with precision-ground bore and OD surfaces. Bore tolerance is maintained within 0/−7 μm (precision grade) or 0/−10 μm (standard grade), ensuring consistent shaft fit and predictable clearance across batch procurement.
Three Variants for Different Installation Requirements
Select LM30UU for standard closed-type general applications. Specify LM30UUAJ when the axis requires preload adjustment or clearance control. Choose LM30UUOP when the housing design requires side-shaft access or the installation involves minor shaft deflection compensation.
Direct Interchangeability with Standard 30mm Housings
The linear bushing 30 conforms to standard LM…UU dimensional specifications. OD 45mm, length 64mm, and bore 30mm are consistent with SCS30UU, SCJ30UU, and SBR30 housing systems, allowing drop-in replacement without housing modification or additional machining.
Available Variants
| Model | Type | Description |
|---|---|---|
| LM30UU | Standard Closed | Full circumference contact, general-purpose |
| LM30UUAJ | Adjustable Clearance | Adjustable slot for preload tuning; clearance weight 245 gf |
| LM30UUOP | Open Type | Slotted shell for side-access shaft mounting |
For standard shaft guidance with no special requirements, LM30UU is the recommended starting point. Specify LM30UUAJ when the application requires preload adjustment or zero-clearance fit. Specify LM30UUOP when the housing design requires side-shaft access or when compensating for minor shaft deflection.
LM30UU Linear Bushing – Application Scenarios
The LM30UU 30mm linear bearing is specified across a range of industrial motion and automation platforms where 30mm shaft diameters are standard:
CNC Machine Toolss
Z-axis and X-axis column guidance on vertical machining centers, where the 30mm shaft size handles higher spindle-load reaction forces compared to 20mm configurations.
Industrial Robots & Gantry Systems
Linear actuator and pick-and-place gantry axes requiring consistent radial stiffness under multi-directional payload.
Automated Assembly & Conveying Equipment
Horizontal slide units in automotive and electronics assembly lines with continuous reciprocating motion cycles.
Injection Molding & Hydraulic Press Guides
Ejector pin guide assemblies and platen alignment shafts where the 30 linear bearing must maintain bore accuracy under thermal and mechanical loading.
Semiconductor & Flat Panel Display Equipment
Precision stage and wafer-handling systems requiring low-friction, low-noise linear motion in controlled environments.
Printing & Textile Machinery
Carriage travel and tension roller guides requiring consistent stroke repeatability over high cycle counts.
Why Source LM30UU from SQ Bearing
Zhejiang SQ Bearing Manufacturing Co., Ltd. has produced LM…UU series linear bushings since 2007. The facility covers 19,800㎡ and operates over 100 CNC turning centers, precision grinding machines, and centerless grinding lines - the process steps that directly determine bore roundness and OD tolerance of a 30 LM bushing.
Every LM30UU linear bearing is produced under ISO 9001 certified quality management. ROHS and REACH compliance is maintained across all bearing steel materials and surface treatments. In-process inspection covers incoming steel verification, machining tolerances, ball circuit assembly concentricity, and final go/no-go dimensional check.
Safety stock is maintained for LM30UU, LM30UUAJ, and LM30UUOP across standard production runs. Sample orders ship within 3–5 business days. Bulk orders of 500+ pcs are fulfilled within 15–20 days with full dimensional inspection reports available on request.
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 sample orders are accepted.
Frequently Asked Questions
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