do these fit threaded curl bars?

I don't know what threaded curl bars are, but if it helps, the collar openings are 1.25" open and 1.125" closed and fit the standard bars we use for Les Mills Body Pump.

what diameter light has to do thick bar serve?

I have the Troy Lite barbell which has a 1" diameter bar and the 1" Lock-Jaw Collar works perfectly. I think, as mentioned here, Olympic bars have a thicker diameter bar.

I have 28mm (not 1 inch) smooth bars. Will these fit?

On a 1 1/16" bar they are a tight fit. Since a 28 mm bar is equivalent to about 1 7/64" I doubt that they would fit.

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Description

🔒 Lock in your gains with Lock-Jaw – the collar that never quits!

LIGHTWEIGHT POWER - Only 4 ounces per set—strong hold without the bulk, perfect for intense sessions.
TRUSTED SINCE 1986 - Backed by a 3-year limited warranty and a legacy of professional-grade fitness gear.
UNIVERSAL 1 INCH FIT - Seamlessly clamps all standard barbell sleeves for hassle-free workouts.
INSTANT LOCK RELEASE - Single-action cam lock ensures lightning-fast secure grip and effortless removal.
UNBREAKABLE DURABILITY - Crafted with a solid nylon resin frame and injection molded pads built to last.

The ironcompany Lock-Jaw 1 Inch Barbell Collar Pair is engineered for serious lifters seeking a secure, durable, and fast-locking solution for standard 1-inch bars. Featuring a solid injection molded nylon resin frame and pressure pads, these collars deliver exceptional grip and longevity. Lightweight yet robust, they offer quick single-action cam locking and come with a 3-year limited warranty, making them a trusted choice since 1986 for professional-grade fitness enthusiasts.

Specifications

ASIN	B00HFAJZK4
Best Sellers Rank	#29,810 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #23 in Exercise Collars
Brand Name	ironcompany
Customer Reviews	4.6 4.6 out of 5 stars (1,127)
Finish Type	Black
Global Trade Identification Number	00753182418711
Grip Size	1
Grip Type	Knurled
Item Dimensions L x W	2"L x 1.25"W
Manufacturer	Ironcompany.com
Material	Alloy Steel
Model Number	50478
Mounting Hole Diameter	1 inches
Number of Items	1
Part Number	50478
UPC	634392199549
Weight Capacity Maximum	4 ounces

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