what diameter of the shaft ?

20mm - after I received it, I figured out that the last number in the model # is the diameter.

What is the difference between the SBR12, SBR16 and SBR20 models?

I believe the difference is the diameter of the rails in millimeters.

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VEVOR Linear Rail Slide SBR12-1000mm 2 PCS and 4 PCS SBR12UU Slide Blocks Linear Guide Rail and Bearings Kit for Automated Machines DIY Project CNC Router Machines

VEVOR Linear Rail Slide SBR12-1000mm 2 PCS and 4 PCS SBR12UU Slide Blocks Linear Guide Rail and Bearings Kit for Automated Machines DIY Project CNC Router Machines

Product ID: 490192068

Details

Bearing Type
Linear Bearing
Brand
VEVOR
Item Weight
3.9 Kilograms
Item dimensions L x W x H
31.5 x 3.15 x
Material
Alloy Steel

📏1000mm precision rail length

⚙️4 high-precision SBR12UU bearing blocks

🛡️Durable chrome-plated carbon steel

€ 245.18

Duties & taxes included

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Sold byAmazon CyprusDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚙️ Elevate your automation game with precision that moves you!

BUILT TO LAST - Crafted from chrome-plated carbon steel and bearing steel with aluminum alloy housing for superior rust resistance and long-term durability.
PRO LEVEL STABILITY - Aluminum alloy supports combined with precision rails ensure rock-solid stability and accuracy in every movement.
SMOOTH PRECISION GLIDE - Experience ultra-smooth linear motion with industrial-grade SBR12UU bearing blocks for flawless CNC and automation projects.
EFFORTLESS INSTALLATION - Quick-align rail and slide blocks for hassle-free setup—no maintenance needed, so you stay focused on your build.
VERSATILE INDUSTRIAL POWERHOUSE - Perfect for DIY CNC routers, laser machines, lathes, and even large-scale industrial robots—engineered for every automation challenge.

The VEVOR Linear Rail Slide SBR12-1000mm kit includes two 1000mm chrome-plated carbon steel rails and four high-precision SBR12UU bearing blocks with aluminum alloy housing. Designed for smooth, durable, and maintenance-free linear motion, this kit is ideal for CNC routers, automated machinery, and industrial applications requiring reliable and precise linear guidance.

Specifications

ASIN	B0BLSC6936
Best Sellers Rank	#305,970 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #54 in Linear Motion Slide Rails
Date First Available	November 8, 2022
Item Weight	7.5 pounds
Item model number	SBR12-C 1000L
Manufacturer	VEVOR
Product Dimensions	39.37 x 2.56 x 3.94 inches

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