---
product_id: 36776078
title: "LM12UU Linear Motion Ball Bearings 12x21x30 mm LM12 Linear Bearing"
brand: "jsb great bearings"
price: "$15.63"
currency: USD
in_stock: true
category: "Jsb Great Bearings"
url: https://www.desertcart.us/products/36776078-lm12uu-linear-motion-ball-bearings-12x21x30-mm-lm12-linear-bearing
store_origin: US
region: United States of America
---

# Precision 12x21x30 mm sizing Durable alloy steel build Grease-compatible for smooth motion LM12UU Linear Motion Ball Bearings 12x21x30 mm LM12 Linear Bearing

**Brand:** jsb great bearings
**Price:** $15.63
**Availability:** ✅ In Stock

## Summary

> ⚙️ Glide with precision, perform with confidence.

## Quick Answers

- **What is this?** LM12UU Linear Motion Ball Bearings 12x21x30 mm LM12 Linear Bearing by jsb great bearings
- **How much does it cost?** $15.63 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/36776078-lm12uu-linear-motion-ball-bearings-12x21x30-mm-lm12-linear-bearing)

## Best For

- jsb great bearings enthusiasts

## Why This Product

- Trusted jsb great bearings brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Smooth Linear Motion:** Grease-compatible design guarantees frictionless, whisper-quiet operation.
- • **Versatile Compatibility:** Ideal for cycling headset bearings and a wide range of linear motion applications.
- • **Precision Engineered Fit:** Exact 12mm bore ensures seamless integration with your linear shafts.
- • **Trusted Brand Reliability:** JSB Great Bearings delivers consistent quality trusted by professionals worldwide.
- • **Robust Alloy Steel Construction:** Built to last with high-strength alloy steel for enduring performance under pressure.

## Overview

The LM12UU Linear Motion Ball Bearing by JSB Great Bearings features a precise 12x21x30 mm dimension, crafted from durable alloy steel and optimized for grease lubrication. Designed for smooth, reliable linear motion, it’s perfect for cycling headset parts and other high-performance applications requiring exact fit and long-lasting durability.

## Description

JSB Great Bearings: **Linear Ball Bearing ***Dimension d (Inside) Bore 12 mm D (Outside) 21 mm L (Length) 30 mm

## Features

- LM12UU linear motion ball bearings 12x21x30 mm LM12 linear bearing
- Linear Ball Bearings
- Linear motion bearing
- linear bearings
- linear ball bearing

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00KU7O9AA |
| Bearing Number | LM12UU |
| Bearing Type | Ball Bearing |
| Brand | JSB Great Bearings |
| Brand Name | JSB Great Bearings |
| Compatible Lubricant | Grease |
| Manufacturer | JSB |
| Material | Alloy Steel |
| Material Type | Alloy Steel |

## Images

![LM12UU Linear Motion Ball Bearings 12x21x30 mm LM12 Linear Bearing - Image 1](https://m.media-amazon.com/images/I/41+bf5zfJuL.jpg)

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**Shop now:** [https://www.desertcart.us/products/36776078-lm12uu-linear-motion-ball-bearings-12x21x30-mm-lm12-linear-bearing](https://www.desertcart.us/products/36776078-lm12uu-linear-motion-ball-bearings-12x21x30-mm-lm12-linear-bearing)

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-05-19*