I don’t understand these chain sizes describe them to other sizes

As expamples: a #50 chain has a 5/8" link length from center of river to center of rivet. A #40 is 4/8" center to center and so on. The # comes from the number of 1/8's the chain links are. You can measure your existing chain in 8ths of an inch and thats your size. Then, you need to figure out how many teeth are on the sprocket you need. Such as "17h." The last number is the size of the hole in the bearing for its axle. IE: 1/2" bore or 5/8" bore.

what is out side diameter and are there set screws to fasten it to shaft

The outside is 3 1/2" and there are no set screws.

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⚙️ Upgrade your gear with precision and power!

OPTIMIZED FIT - 1/2 inch bore size ensures hassle-free installation and secure mounting
ENHANCED DURABILITY - Hardened teeth paired with 203KRR2 bearing for extended wear life
ROBUST MATERIAL BUILD - Crafted from medium carbon steel with black oxide coating for corrosion resistance
LIGHTWEIGHT YET STRONG - Weighs just 318g, balancing strength and efficiency for your equipment
PRECISION ENGINEERED TEETH - 17 teeth designed for seamless 40 roller chain compatibility

The Jeremywell 40BB17H1/2Bore Idler Sprocket features 17 hardened teeth, a 1/2 inch bore, and is made from durable AISI 1045 medium carbon steel with a black oxide finish. Designed for 40 roller chains, it offers reliable performance and long-lasting wear, making it an essential upgrade for lawn mower and outdoor power equipment maintenance.

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Brand	Jeremywell
Model Number	SP-40BB17H-1/2
Product Dimensions	10.16 x 15.24 x 2.54 cm; 317.51 g
Material	black_oxide
Special Features	double_pitch_strand
Item Weight	318 g

Jeremywell 40BB17H1/2Bore 17 Tooth Idler Sprocket for 40 Roller Chain|

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