What is the thread size for the blocks? I think they're M5 but what is the thread number?

My blocks were M5 x 0.8 on the four top mounting holes. Be careful when mounting these as the center-to-center distance is 2 mm difference between the width and length run on the blocks. My M5 holes (4) were not drilled properly and gave the block an angled "run" down the rail. You can't correct this. The only option was to drill the matching holes over size to compensate for the alignment. I ordered an assortment of M5 cap head screws from Amazon in various lengths. This M5 set was very helpful during assembly.

Can the rails be attached to the ceiling? Will it support a downward pulling force on the sliding blocks?

I wouldn’t do it. The bearings are only on the top of the bushings

Do you have cad files for the linear guides?

Just google the SBR specification. The hole pattern is a perfect rectangle 32mm center-to-center in width (across the rail), and 30mm in length. Screw size is M5, no more than 12mm in length.

how much weight can these carry?

These rails are strong and should support at least 40 pounds of downward pressure. The rails are also based on the support underneath. I used these rails as cross spans on my router sled. I used an all-aluminum mount for my 3 1/4HP Makita router and had excellent results. It was sturdy with little if any sagging or deflection in the middle of the travel.

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2Pcs SBR16-2000mm Linear Rail Guide + 4Pcs SBR16UU Square Type Slide Bearing Block, 16mm Linear Rail Overall Length 78.7 inch/2000mm for Fully Supported Linear Rail

2Pcs SBR16-2000mm Linear Rail Guide + 4Pcs SBR16UU Square Type Slide Bearing Block, 16mm Linear Rail Overall Length 78.7 inch/2000mm for Fully Supported Linear Rail

Product ID: 319925061

Details

Bearing Number
SBR16UU
Brand
GUWANJI
Item Weight
10000 g
Item dimensions L x W x H
80.71 x 3.94 x
Material
Alloy Steel

📏2000mm precision length

⚙️4 high-precision SBR16UU blocks

🛠️M5 x 20 screws for secure mounting

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Description

⚙️ Glide into precision — elevate your build with pro-grade linear rails!

VERSATILE APPLICATION RANGE - Perfect for DIY CNC routers, laser machines, industrial robots, and more
ROBUST ALUMINUM ALLOY SUPPORT - Stabilizes rails for maximum durability and vibration resistance
COMPLETE MOUNTING KIT INCLUDED - 16 M5 screws for hassle-free, secure installation right out of the box
INDUSTRIAL GRADE SBR 16 UU BLOCKS - High-accuracy roller bearings ensure whisper-quiet, low-friction performance
PRECISION ENGINEERED 2000 MM RAILS - Ultra-smooth linear motion for flawless CNC and industrial applications

This kit includes two 2000mm SBR16 linear rails and four SBR16UU roller bearing blocks, crafted from corrosion-resistant alloy steel with chrome plating for durability and smooth, low-noise operation. Designed for industrial and DIY CNC applications, it features aluminum alloy supports for enhanced stability and comes with all necessary mounting screws for easy installation.

Specifications

ASIN	B08BFXNTDY
Bearing Number	SBR16UU
Bearing Type	Roller Bearing
Best Sellers Rank	#90,526 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #65 in Linear Motion Guides
Brand Name	GUWANJI
Compatible Lubricant	Grease
Customer Reviews	4.4 4.4 out of 5 stars (248)
Item Dimensions	80.71 x 3.94 x 3.54 inches
Item Weight	10000 g
Manufacturer	GUWANJI
Material Type	Alloy Steel
Model	2000mm
Outside Diameter	16 millimeters
Part Number	G176XYP61M37FI261N4E8KC2E
UPC	190459823425
Unit Count	6 Count

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NT$13708

Duties & taxes included

In stock

Sold byAmazon TaiwanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Taiwan.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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