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Plastic Sprocket for Top Chains 820 (Part Numbers)

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MISUMI

MiSUMi Economy

MISUMI

Part Number

Configured Part Number is shown.

Drawing/Specifications
Part Numbers

Product Overview

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

Dimensional Drawing

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

Material Specifications

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

Specification Table

Type

Application + Processing Method

Categorization

Distinction

Number of Teeth

Hole Shape + Diameter

TC MD

820ZSF

19T

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

: 30; 60; 90

Part Number
EA-TCMD-820BZS-ID-19T-R[25,30]
EA-TCMD-820BZS-ID-21T-R[25,30]
EA-TCMD-820BZS-ID-23T-R[25,30]
EA-TCMD-820BZS-ID-25T-R[25,30]
EA-TCMD-820ZSF-DR-19T-R[25,30]
EA-TCMD-820ZSF-DR-21T-R[25,30]
EA-TCMD-820ZSF-DR-23T-R[25,30]
EA-TCMD-820ZSF-DR-25T-R[25,30]

Standard Unit Price	Minimum order quantity	Days to Ship	Number of Teeth	Distinction	Hole Diameter d (mm)
-	1 Piece(s)	18 Day(s) or more	19 teeth	Idler Sprocket	25 ～ 30
-	1 Piece(s)	18 Day(s) or more	21 teeth	Idler Sprocket	25 ～ 30
-	1 Piece(s)	18 Day(s) or more	23 teeth	Idler Sprocket	25 ～ 30
-	1 Piece(s)	18 Day(s) or more	25 teeth	Idler Sprocket	25 ～ 30
-	1 Piece(s)	18 Day(s) or more	19 teeth	Drive Sprocket	25 ～ 30
-	1 Piece(s)	18 Day(s) or more	21 teeth	Drive Sprocket	25 ～ 30
-	1 Piece(s)	18 Day(s) or more	23 teeth	Drive Sprocket	25 ～ 30
-	1 Piece(s)	18 Day(s) or more	25 teeth	Drive Sprocket	25 ～ 30

Basic Information

Model	Type 820

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8 Part Numbers

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Configure Remaining Specifications

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Specification/Dimensions

Number of Teeth
19 teeth

21 teeth

23 teeth

25 teeth
Clear
Distinction
- Drive Sprocket
- Idler Sprocket
Clear
Hole Diameter d(mm)
25

30
Clear

Days to Ship

All

18 Day(s) or Less
Clear

Specify Alterations

The specifications and dimensions of some parts may not be fully covered. For exact details, refer to manufacturer catalogs .

Frequently asked question (FAQ)

Question: Why is there severe wear on the side of the sprocket?: Answer: The fixed position of the sprocket on the shaft has shifted, causing the chain plate to run off-center and resulting in continuous friction on the side.
Question: What should I do if operation is not smooth in high or low temperature environments?: Answer: Plastic materials have a high coefficient of expansion, so sufficient axial clearance must be left; otherwise, thermal expansion and compression of the sprocket will hinder rotation.
Question: If the number of sprocket teeth is the same, why does the chain plate not pass over the teeth smoothly?: Answer: The tooth profile curves of 820 sprockets produced by different manufacturers may vary slightly. Mixing them can cause meshing interference, so the pitch parameters must be checked.