USED TSUBAKI 40B21F

The Tsubaki 40B21F is a single-strand, Type B finished bore roller chain sprocket designed for ANSI #40 (1/2" pitch) roller chain. It features a hub extension on one side (Type B) with a factory-machined keyway and two set screws, making it ready for direct shaft mounting. The stock bore is 5/8 in and can be re-bored up to a maximum of 1-7/8 in to suit your shaft size. Constructed of carbon steel with hardened teeth, this sprocket is engineered for industrial power transmission, conveyor, and drive applications requiring reliable performance.
Specification
Value
Brand
Tsubaki (U.S. Tsubaki)
Model / Part Number
40B21F
Chain Number (ANSI)
#40
Chain Pitch
1/2 in (0.500 in)
Number of Teeth
21
Hub Type
Type B (hub extension one side)
Bore Type
Finished Bore (with keyway & 2 set screws)
Stock Bore Diameter
5/8 in (0.625 in)
Maximum Bore Diameter
1-7/8 in (1.875 in)
Outside Diameter (OD)
3.620 in
Pitch Diameter
3.355 in
Caliper Diameter
3.033 in
Hub Diameter
2.750 in (2-3/4 in)
Length Through Bore (LTB)
1.000 in
Tooth Nominal Width
0.284 in
Chain Roller Diameter
0.312 in
Chain Inside Width
5/16 in
Number of Strands
Single
Shaft Orientation
Horizontal
Material
Carbon Steel
Hardened Teeth
Yes
Keyway
Yes (standard keyway included)
Set Screws
2 (directly over keyway & 90° from keyway)
Bushing Required
None
Standards
ANSI
Weight
~1.730 lb
We warranty all items for 30 days from date of purchase.