What is the inner diameter of the center/axle hole.

I assume you are referring to the actual axle on the sturmey AW3 hub, not the cog as shown. The only reason the axle is hollow is to allow the shift spindle to be screwed in, and that part is universal. My point- I don't know, and there's no reason to worry bout it. If you mean the inner diameter of the actual cog shown, same thing. it's universal and fits all sturmey hubs. Fugedaboutit.

Will this fit a 1952 sa 3 speed (aw) hub?

It fit on a 1961 and 1972 SA AW 3 speed.The chain will need to be longer.

Can this go on non-coaster brake bike?

Yes; I bought one for a non-coaster brake bike (but it's true that coaster brake bikes have 1/8" chain and cogs).

Sturmey Archer 1 8 22t Coaster Brake Cog

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Description

⚙️ Upgrade your ride with precision and style — don’t get left behind!

3 SPLINE INTERFACE - Ensures rock-solid, slip-free hub compatibility
CHROME PLATED STEEL - Durable, corrosion-resistant finish for lasting style
DISHED COG FLEXIBILITY - Fine-tune your chainline for peak drivetrain performance
PRECISION 22 TOOTH DESIGN - Optimized gear ratio for smooth, efficient rides
VERSATILE URBAN TRAIL READY - Perfect for commuters, cruisers, and adventure seekers

The Sturmey Archer 1/8" 22t Coaster Brake Cog is a chrome-plated steel component engineered for 3-speed internal gear hubs. Featuring a 3-spline secure fit and a dished design for precise chainline adjustment, it delivers durable, corrosion-resistant performance ideal for urban commuting and versatile cycling needs.

Specifications

ASIN	B006GHD17A
Best Sellers Rank	#297,193 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #121 in BMX Components & Parts
Brand Name	Sturmey Archer
Color	Chrome
Customer Reviews	4.8 4.8 out of 5 stars (138)
Date First Available	October 19, 2011
Included Components	Internally Geared Hub Part
Item Dimensions LxWxH	3 x 3.75 x 0.25 inches
Item Package Dimensions L x W x H	4.65 x 3.7 x 0.35 inches
Item Weight	3.68 ounces
Manufacturer	Sturmey-Archer
Material	Multi
Model Name	3-Speed Dished Cog
Number of Items	1
Package Weight	0.1 kg
Part Number	HLS830
Style	Internally Geared Hub Part
Suggested Users	Does Not Apply
Warranty Description	Limited Warranty

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