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You might not think engineers are brave.....But it took balls of steel to make the first bearings.
You might not think engineers are brave.....But it took balls of steel to make the first bearings.

40B72H Type B Heat Treated Sprocket for #40 Roller Chain - 72 Tooth - Pick Your Bore Size

$79.00
SKU 40B72H-SB
Size

40B72H Type B Sprocket

 

Finished Bore W/Keyway and Set Screws

For #40 Roller Chain

72 Tooth

Outside Diameter = 11.750"

Pitch Diameter = 11.463"

LTB = 1 1/4"

Hub Diameter = 4"

FREE SHIPPING in Lower 48 States

Buy 2 or More Type B Sprockets and Take 10% Off at Checkout!

Use coupon code:   K1E3BE3RHDZC 

Coupon not for use with Quantity Discount Items

Standard Keyway Sizes
Listed are the standard keyway sizes furnished with corresponding bore sizes. 

Bore Keyway
1/2” to 9/16” =  1/8” X 1/16”
5/8” to 7/8” =    3/16” X 3/32”
15/16” to 1-1/4” = 1/4” X 1/8”
1-5/16” to 1-3/8” = 5/16” X 5/32”
1-7/16” to 1-3/4” = 3/8” X 3/16”
1-13/16” to 2-1/4” = 1/2” X 1/4”

2-5/16 to 2-3/4" = 5/8" x 5/16"

2-13/16" to 3-1/4" = 3/4" x 3/8"

3-5/16" to 3-3/4" = 7/8" x 7/16" 

3-13/16" to 4-1/2" = 1" x 1/2"