Wanting to use for a children's sensory board. Would these work for wheels like for a car...etc. What kind of hardware to connect on board?

These are concave so more of a pulley than a car wheel. You would use ordinary 1/4 bolts to fasten. They are good quality and run very smoothly.

Does anyone know the id of the black part? or in other words the od of the bearing? i am trying to find a spacer that will fit inside. thanks.

OD that is visible is 20mm ( 13/32" ). The rest of the race is embedded in the plastic. There is not enough outer race visible to put a spacer against it. I I used nylon spacers of 12mm ( 1/2" ) in diameter mated to the inner race on both sides of the bearing. A machine bolt fits nicely into the hole of the nylon spacer to mount it to whater you like.

What load can these handle?

I do not know. They are very hefty.

What's the inner diameter of the wheel where bearing sits

I don't have one to measure and the information in the Amazon listing only shows the inner diameter of the bearing, not the rubber groove. I suggest you contact the vendor through the Amazon link

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🚀 Elevate Your DIY Game with Smooth Precision!

DIY DREAM - Transform your projects with these versatile U groove wheels!
SILENT STRENGTH - Experience whisper-quiet operation with internal lubrication.
EASY INSTALLATION - Perfect for replacing skateboard wheels or building camera tracks.
PRECISION ENGINEERING - Crafted from reinforced nylon and bearing steel for durability.
HEAVY DUTY PERFORMANCE - Support up to 368lbs for all your mechanical needs.

The LYJEE Letool 4pcs U Groove Pulley set features high-quality reinforced nylon and bearing steel construction, designed for smooth operation and a maximum load-bearing capacity of 167kg (368lbs). Ideal for DIY enthusiasts, these pulleys are perfect for building camera track systems or replacing wheels on dollies, making them a must-have for any project.

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Manufacturer	Letool International Ltd.
Part number	U0840-20
Item Weight	26.3 g
Package Dimensions	7.7 x 4.6 x 4.29 cm; 26.3 g
Item model number	U0840-20
Size	84020mm
Color	Black
Material	High Carbon Steel
Item Package Quantity	4
Measurement System	Inch
Batteries Included?	No
Batteries Required?	No

LYJEE Letool 4pcs 608zz coated pa66 nylon 1.57inches bearing roller wheel 8x40x20mm U type groove pulley

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