can 2 of them be deployed in tandem for an 8" duct?

Yes, I’m sure that they could. They open completely up and should be able to be linked together just like most hose clamps. I’m using all of mine on 4 inch hoses now or I’d try it for you, but I’m pretty sure it will work.

I think I've overtightened the fastener and need to get a new or better one. What's max torque allowance recommended?

I don't know what the max torque is but I know I've exceeded it several times. I really do not like these. I switched to the kind you tighten with a screwdriver and I find them to be much much better.

Where are these clamps manufactured?

I don't know for sure, but probably China, like everything else these days. I will say they are pretty good clamps and I haven't had any problem with cranking on them with sufficient force.

How much weight does a hose clamp support?

I have used them as part of a dust collection system where they are not supporting anything more than 5 or 6 feet of 4” hose.

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🔧 Clamp it, twist it, own it—no tools, no hassle!

MULTI INDUSTRY READY - Ideal for ductwork, dryer vents, dust collection, and more—trusted by professionals in mechanical, agricultural, and recreational vehicle sectors.
VERSATILE SIZE RANGE - Adjustable from 3-7/16” to 4-7/16” diameter, fitting a wide variety of hoses, ducts, and pipes with precision.
ERGONOMIC BLUE KEY DESIGN - Durable polymer key reduces knuckle strain and offers high visibility for fast, hassle-free installation.
EFFORTLESS TOOL FREE ADJUSTMENT - Say goodbye to screwdrivers—tighten or loosen clamps with a simple twist of the large, easy-grip key.
PREMIUM 304 STAINLESS STEEL BUILD - Rust-resistant and built to last, perfect for indoor and outdoor applications across automotive, marine, and home projects.

The Fulton 4 Inch Thumb Screw Key Adjustable Hose Clamps come in a 5-pack, crafted from premium 304 stainless steel for superior rust resistance and durability. Featuring a large, ergonomic blue polymer key, these clamps enable quick, tool-free adjustments, making installation and removal effortless. With a flexible size range from approximately 3-7/16” to 4-7/16” diameter, they are perfect for securing ductwork, dryer vents, automotive hoses, and more, suitable for both indoor and outdoor professional applications.

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Brand	Fulton
Material	Steel
Color	Silver
Item Weight	0.15 Kilograms
Outside Diameter	4 Inches
UPC	817918022099
Manufacturer	Fulton Woodworking Tools and Accessories
Part Number	Varitaion Hose Clamps
Item Weight	5.3 ounces
Package Dimensions	7.68 x 7.01 x 1.5 inches
Item model number	Varitaion Hose Clamps
Size	4" Hose Clamps
Style	4" Hose Clamp 5 Pack
Item Package Quantity	1
Included Components	5 Hose Clamps
Batteries Included?	No
Batteries Required?	No

Fulton 4 Inch Thumb Screw Key Adjustable Stainless Steel Hose Clamps - 5 Pack, Pipe, Dryer Vent, Dust Collection, Automotive, RV Clamps

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