Can the tube be sawn shorter to reduce overall height?

As the pars are not welded together I don't see why not. Don't remember how long the screw part is but you can cut it short enough so the crew still fits the length when fully retracted.One thing to remember is that the cut must be flat enough so that the load on it is perpendicular or, I would think, the possibility of a rollover is possible especially since the base, the tube and top are not welded together.

can these be used in pairs with a beam to support 3 or 4 joists at a time?

Absolutely. I have had engineers approve using these jacks to support beams over 12 feet long. You may have to reinforce your floor or use a 4x8x12 solid cement block to spread the weight load of the post.

Would 2 be sufficient to support multiple joists with 2 - 8ft long 2x8's or would 3 be better?

Much of that depends on the load your going to be putting on the 2bys. I would do a minimum of 3. You should be able to tell if you need more by looking at any deflection in the 2bys if there is some you’ll need more. Are yoU using this as extra supports for joists?

How are these used? I used a set years ago, but the top had a "nut" set to turn with a crescent wrench until tight, this appears round at top?

That looks different from mine which did have a nut to turn. May want to call the company?

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🔧 Elevate Your Support Game!

SAFETY FIRST - Equipped with a double carriage lock for enhanced stability and peace of mind during use.
CUSTOMIZABLE FIT - Easily adjustable from 1' to 1' 3" for versatile applications in various settings.
MULTI PURPOSE UTILITY - Ideal for temporary or secondary support in high-load areas like stairs, porches, and crawl spaces.
HEAVY DUTY PERFORMANCE - Engineered to support up to 18,000 lbs, ensuring you can tackle any project with confidence.
CORROSION RESISTANT DESIGN - Crafted from premium high-carbon steel with a protective coating to withstand the test of time.

The Tiger Brand Adjustable Floor Jack (Model JS-15) is a robust and versatile tool designed for temporary or secondary support in various applications. With a load capacity of up to 18,000 lbs and an adjustable height range of 1' to 1' 3", this high-carbon steel jack ensures durability and safety, making it an essential addition to any professional toolkit.

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Manufacturer	TV Non-Branded Items (Home Improvement)
Part number	JS-15
Item Weight	1.78 Kilograms
Product Dimensions	7.62 x 35.56 x 12.7 cm; 1.78 kg
Item model number	JS-15
Size	1' 0" - 1' 3"
Color	Black
Style	Floor Jack
Material	plastic
Item Package Quantity	1
Included components	Tiger Brand Adjustable Floor Jack (Model JS-15), 15 Gauge Floor Jacks, Telescoping Jack For Temporary Support, Size Range 1'-1' 3"
Batteries Included?	No
Batteries Required?	No

Tiger Brand Adjustable Floor Jack (Model JS-15) 15 Gauge Floor Jacks Telescoping Jack For Temporary Support Size Range 1'-1' 3"

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