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 – don’t get left behind!

COMPACT LIGHTWEIGHT - Just 318g with a sleek 2.99 inch outer diameter for space-efficient setups
PERFECT FIT 1 2 BORE - Designed to fit standard 40 roller chains ensuring easy installation and reliable performance
HARDENED STEEL DURABILITY - AISI 1045 medium carbon steel with black oxide finish resists corrosion and extends lifespan
TRUSTED JEREMYWELL QUALITY - Manufactured to exacting standards for professional-grade reliability in outdoor power equipment
PRECISION ENGINEERED 17 TEETH - Optimized for seamless power transmission and minimal wear

The Jeremywell 40BB17H1/2Bore Idler Sprocket features 17 hardened teeth (HRC 40-50) crafted from durable AISI 1045 medium carbon steel with a corrosion-resistant black oxide finish. Designed for 40 roller chains with a 1/2 inch bore, it offers reliable, long-lasting performance in lawn mower and outdoor power equipment applications.

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Manufacturer	Jeremywell
Part number	SP-40BB17H-1/2
Item Weight	318 g
Product Dimensions	10.16 x 15.24 x 2.54 cm; 317.51 g
Item model number	SP-40BB17H-1/2
Material	black_oxide
Item Package Quantity	1
Teeth Per Inch	0.5 Inches
Batteries Included?	No
Batteries Required?	No

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

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