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 1000mm /39.4 inch Linear Rail with 4Pcs SBR16UU Linear Bearing Sliding Block CNC Parts for Fully suppoeted Shaft Rod

2Pcs 1000mm /39.4 inch Linear Rail with 4Pcs SBR16UU Linear Bearing Sliding Block CNC Parts for Fully suppoeted Shaft Rod

Product ID: 319925061

Details

Bearing Number
SBR16 1000mm
Brand
GUWANJI
Item Weight
5137 Grams
Item dimensions L x W x H
41.34 x 3.94 x
Material
Alloy Steel

📏1000mm precision length

⚙️4 high-precision sliding blocks

🛡️Chrome-plated anti-rust durability

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€ 266.06

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Sold byAmazon FranceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚙️ Glide into precision — upgrade your motion game with pro-grade rails!

BUILT TO LAST - Chrome plating and alloy steel construction deliver superior hardness and corrosion resistance.
SMOOTH OPERATOR - 4 industrial-grade SBR16UU bearing blocks ensure flawless sliding and positioning.
PRECISION PERFECTED - 1000mm SBR16 rails engineered for ultra-smooth, low-noise linear motion.
VERSATILE POWERHOUSE - Ideal for CNC routers, laser machines, industrial robots, and large-scale automation.
EFFORTLESS ADJUSTMENT - Integrated handle lets you fine-tune slider tightness for optimal performance.

This kit includes two 1000mm SBR16 linear rails and four SBR16UU bearing blocks made from high-quality alloy steel with chrome plating for enhanced durability and corrosion resistance. Designed for smooth, low-noise operation, these industrial-standard components are perfect for CNC machines, automation equipment, and precision mechanical applications.

Specifications

ASIN	B08BFX14FB
Bearing Number	SBR16 1000mm
Bearing Type	Ball Bearing
Best Sellers Rank	#122,813 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #121 in Linear Motion Guides
Brand Name	GUWANJI
Compatible Lubricant	Grease
Customer Reviews	4.4 4.4 out of 5 stars (246)
Item Dimensions	41.34 x 3.94 x 3.54 inches
Item Weight	5137 Grams
Manufacturer	GUWANJI
Material Type	Alloy Steel
Model	1000mm
Part Number	RD6PNEWNX24ZCWT54316OTZWL
Specification Met	Industry Standard
UPC	190459824798
Unit Count	6.0 Count

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