Is it 400 lbs per one roller?

as far as i know I think that is how they are rated

What is the 5inch/2cm measurement in the photo? error?

Maybe the photo has been changed, but it shows 2inch/5cm now. Not 5inch/2cm. 5 cm is very close to 2 inches.

Will these work rolling over berber carpeting supporting a 140 lb. buffet cabinet?

It would depend on how many you use and placement. I don't think that four, with one at each corner would be satisfactory. Technically, they would support the weight (I think) but it may be difficult to actually roll the cabinet.

Manufacturer	HNBun
Part number	HBUS-BallTransfers-16pcs--210323
Item Weight	1.86 Kilograms
Package Dimensions	14.81 x 11 x 8.71 cm; 1.86 kg
Item model number	HBUS-BallTransfers-16pcs--210323
Color	Silver
Material	Carbon Steel
Item thickness	0.2 Inches
Item Package Quantity	1
Measurement System	Inch
Plug Profile	Plate Mount
Batteries Included?	No
Batteries Required?	No

16Pcs 1” Roller Ball Transfer Bearings, 360º Rotation Universal Ball Casters, 400Lbs Carbon Steel Round Ball Transfer Unit for Conveyor, Roller Stand, Transmission, Furniture

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