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

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

€ 408.30

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Description

⚙️ Elevate your motion game with precision that professionals trust!

PRECISION PERFECTED - 2000mm linear rails engineered for ultra-smooth, low-noise motion—ideal for high-stakes CNC and robotics.
ROCK SOLID STABILITY - Aluminum alloy supports combined with bearing steel rails ensure unwavering rigidity and durability under heavy loads.
EFFORTLESS ADJUSTMENT - Integrated handle lets you fine-tune slider tightness for flawless positioning and control every time.
COMPLETE PLUG PLAY KIT - Includes 2 rails, 4 bearing blocks, and 16 M5 screws—everything you need to upgrade your linear motion setup instantly.
INDUSTRIAL GRADE RELIABILITY - Corrosion-resistant chrome plating and wear-resistant materials built to withstand demanding professional environments.

This 2-piece SBR16-2000mm linear rail guide set with 4 SBR16UU square slide bearing blocks offers industrial-grade precision and durability. Featuring corrosion-resistant chrome plating, aluminum alloy supports, and adjustable tightness, it’s engineered for smooth, low-noise linear motion in CNC routers, machine tools, and robotics. Complete with mounting screws, this kit delivers a ready-to-install solution for professionals demanding reliable, high-performance linear guides.

Specifications

ASIN	B08BFXNTDY
Bearing Number	SBR16UU
Bearing Type	Roller Bearing
Best Sellers Rank	#156,122 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #157 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
Number of Items	6
Outside Diameter	16 millimeters
Part Number	G176XYP61M37FI261N4E8KC2E
UPC	190459823425
Unit Count	6 Count

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€ 408.30

Duties & taxes included

In stock

Sold byAmazon AustriaDelivered 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 Austria.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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