Plastic Sprocket for Top Chains 820

The 820 Sprocket is a cost-effective engineered plastic drive component designed for the 820 straight chain plate system with a 38.1 mm pitch. 
Its precision-molded one-piece construction ensures accurate chain engagement, stable transmission, and excellent wear resistance for long-term operational reliability. 
Suitable for drive, tensioning, and conveyor guiding applications, it is widely used in beverage, food packaging, carton transport, and logistics sorting systems, delivering practical value and dependable performance for modern straight conveyor automation lines.

Drive Sprocket	Idler Sprocket
d   D 16 53	d D 45 57
Number of teeth shown: 25

Material: Polyoxymethylene (POM)
Color: Black
Processing method: Injection molding

Type

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Application +  Processing Method

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Categorization

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Distinction

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Number of Teeth

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Hole Shape + Diameter

EA

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TC MD

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820ZSF

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DR

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19T

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R25

 

Type							D (mm)	Weight (g)
Type	Application	Processing Method	Categorization - Distinction	Number of Teeth	Hole Shape	Hole Diameter d (mm)
EA	TC (Sprocket for Chain Plate)	MD (Injection molding)	820ZSF-DR (820 Type Drive Sprocket) 820BZS-ID (820 Type Idler Sprocket)	19T (19 teeth)	R (round hole)	25 30	118	400
				21T (21 teeth)			129
				23T (23 teeth)			143	500
				25T (25 teeth)			155

The bore of the drive sprocket has no keyway
Keyway dimensions for the driving sprocket: for inner diameter = 25, keyway size is 8*4; for inner diameter = 30, keyway size is 10*6.
* Shaft bore diameter tolerance：±0.05 mm