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Spur Gear, Pressure Angle 20°, Module 2.5 (Part Numbers)

Part Number

Configured Part Number is shown.

Product Overview
A gear is a product with teeth added around the circumference of a drive wheel. Gear transmission mechanisms are widely used for transmitting rotational motion, rotational speed, and rotational direction.
 
Dimensional Drawing
 
MISUMI Spur Gear Pressure Angle 20° Module 2.5 Dimension Diagram
Threading of shaft holes is not possible for Type A
Shaft Hole Specifications (Selectable Gear Shapes)
Round HoleKeyway hole
Ground Spur Gear with Round HoleGround Spur Gear with Keyway Hole
Please click Detailed Dimensions of Keyway.
The position relationship between the keyway and the teeth is not fixed.
If the gear shape is not specified, the gear shape will be B.
 
 
Specification Overview
 
Type Material Surface Treatment
Round HoleKeyway
E-GEAHBE-GEAKBGeneral structural steel or carbon steel-
E-GEAHBBE-GEAKBBBlack Oxide Film
When selecting the shaft hole specification without threads, the fixing screws are not included.
If the gear shape is not specified, the gear shape will be B.
If there are requirements for rust prevention, give priority to products with hard chrome plating, electroless nickel plating surface treatment, or stainless steel SUS3 series materials.
 
Product Features
 
Feature 1:
Feature 2:
Feature 3:
Feature 4:
Spur gears can transmit large amounts of power with a stable instantaneous transmission ratio, making them suitable for high-torque transmission and conveying.
Spur gears have a fixed center distance and long service life, making them ideal for compact and highly reliable mechanisms.
MISUMI brand ground spur gears feature high-precision tooth profiles, with accuracy grade JIS B 1702-1 Grade 8; shaft hole diameter tolerance is H8.
Characteristics of Gear Mechanisms
 Advantages:
(1) No transmission delay, not prone to skipping or slipping teeth
(2) Relatively free change of transmission direction
(3) Relatively free adjustment of transmission speed
(4) Suitable for high-power transmission, as well as high-load and high-torque transmission
(5) Less affected by temperature, humidity, or oily environments
(6) Suitable for compact space designs
Disadvantages:
(1) Prone to noise
(2) Lubricating oil required for maintenance
(3) Safety protection devices required
 
Usage Method
 
■ Intended Use for Spur Gears
Type of TransmissionDescriptionTransmission Diagram (Simple)Representative Transmission MethodsRepresentative Types of Transmission Pairings
Parallel TransmissionParallel transmission of rotation/power between two axes with meshing gearsMISUMI Simple Diagram for Fitting between GearsRepresentative Gear Transmission MethodsSpur Gear + Spur Gear
Helical Gear + Helical Gear
Herringbone Gear + Herringbone Gear
Spur Gear + Internal Gear
Helical Gear + Internal Helical Gear
Linear TransmissionRotational displacement/power transmitted linearly, or linear displacement/power transmitted rotationallySimple Diagram for Fitting between Gear and RackRepresentative Gear and Rack Transmission MethodsSpur Gear + Spur Rack
Helical Gear + Helical Rack
 
Precautions
 
If there are requirements for rust prevention, give priority to products with surface treatment of electroless nickel plating or those made of austenitic stainless steel.
Please refer to Surface Treatment and Rust Prevention Methods
When used together, gears will have backlash. The gear positions need to be adjusted according to the on-site assembly conditions to achieve optimal performance.
When selecting the shaft hole specification without threads, the fixing screws are not included.
The position relationship between the keyway and the teeth is not fixed.
 
Example of Use
 
MISUMI Spur Gear Use Case■Organization Name
Double Speed Double Stroke Mechanism

■ Mechanism Function
1. After the cylinder extends, the spur gear rotates and extends above the fixed rack.
After it rotates, the rack on the moving side extends.

■Function of Spur Gears
1. By clamping the pinion between the fixed rack and the moving rack, you can obtain the cylinder stroke plus the rotational circumference of the gear on the fixed rack, effectively doubling the movement distance of the cylinder stroke.

For detailed information, click Double Speed Double Stroke Mechanism.
 
Application Industries
 
Smart phone Medical Electronic & Electrical Appliances
MISUMI spur gears are applicable to the smart phone industry MISUMI spur gears are applicable to the medical industry MISUMI spur gears are applicable to the electronics and electrical appliances industry
Automotive Robotics Lithium battery
MISUMI spur gears are applicable to the automotive industry MISUMI spur gears are applicable to the robotics industry MISUMI spur gears are applicable to the lithium battery industry
 
Related Products
 
(Economy series) Spur gear Module 1.0 Spur Gear, Custom Gear Width & Hub Size, Pressure Angle 20° High-Frequency Quenched Rack, Gear Teeth Grinding Type
MISUMI Economy Spur Gear Module 1.0 MISUMI Gear Width Hub Size Specification Type MISUMI High-Frequency Quenched Rack, Gear Teeth Grinding Type
Representative Model: C-GEAKBB1.0-36-10-B-15N Representative Model: GEFHB1.0-30-8-15-W10-H26 Representative Model: RGEAH1.0-500-A
Advantages: Nitriding treatment, high cost performance Advantage: custom size Advantages: High tooth surface hardness, length can be extended
 
Related Documents
 
Part Number
E-GEAKB2.5-20-25-B-21N
E-GEAKB2.5-20-25-B-22N
E-GEAKB2.5-20-25-B-23N
E-GEAKB2.5-21-25-A-8N
E-GEAKB2.5-21-25-A-10K
E-GEAKB2.5-21-25-A-10N
E-GEAKB2.5-21-25-A-11N
E-GEAKB2.5-21-25-A-12N
E-GEAKB2.5-21-25-A-13N
E-GEAKB2.5-21-25-A-14N
E-GEAKB2.5-21-25-A-15N
E-GEAKB2.5-21-25-A-16N
E-GEAKB2.5-21-25-A-17N
E-GEAKB2.5-21-25-A-18N
E-GEAKB2.5-21-25-A-19N
E-GEAKB2.5-21-25-A-20N
E-GEAKB2.5-21-25-A-21N
E-GEAKB2.5-21-25-A-22N
E-GEAKB2.5-21-25-A-23N
E-GEAKB2.5-21-25-A-24N
E-GEAKB2.5-21-25-A-25N
E-GEAKB2.5-21-25-A-26N
E-GEAKB2.5-21-25-A-27N
E-GEAKB2.5-21-25-B-8N
E-GEAKB2.5-21-25-B-10K
E-GEAKB2.5-21-25-B-10N
E-GEAKB2.5-21-25-B-11N
E-GEAKB2.5-21-25-B-12N
E-GEAKB2.5-21-25-B-13N
E-GEAKB2.5-21-25-B-14N
E-GEAKB2.5-21-25-B-15N
E-GEAKB2.5-21-25-B-16N
E-GEAKB2.5-21-25-B-17N
E-GEAKB2.5-21-25-B-18N
E-GEAKB2.5-21-25-B-19N
E-GEAKB2.5-21-25-B-20N
E-GEAKB2.5-21-25-B-21N
E-GEAKB2.5-21-25-B-22N
E-GEAKB2.5-21-25-B-23N
E-GEAKB2.5-21-25-B-24N
E-GEAKB2.5-21-25-B-25N
E-GEAKB2.5-21-25-B-26N
E-GEAKB2.5-21-25-B-27N
E-GEAKB2.5-22-25-A-8N
E-GEAKB2.5-22-25-A-10K
E-GEAKB2.5-22-25-A-10N
E-GEAKB2.5-22-25-A-11N
E-GEAKB2.5-22-25-A-12N
E-GEAKB2.5-22-25-A-13N
E-GEAKB2.5-22-25-A-14N
E-GEAKB2.5-22-25-A-15N
E-GEAKB2.5-22-25-A-16N
E-GEAKB2.5-22-25-A-17N
E-GEAKB2.5-22-25-A-18N
E-GEAKB2.5-22-25-A-19N
E-GEAKB2.5-22-25-A-20N
E-GEAKB2.5-22-25-A-21N
E-GEAKB2.5-22-25-A-22N
E-GEAKB2.5-22-25-A-23N
E-GEAKB2.5-22-25-A-24N
E-GEAKB2.5-22-25-A-25N
E-GEAKB2.5-22-25-A-26N
E-GEAKB2.5-22-25-A-27N
E-GEAKB2.5-22-25-A-28N
E-GEAKB2.5-22-25-A-29N
E-GEAKB2.5-22-25-B-8N
E-GEAKB2.5-22-25-B-10K
E-GEAKB2.5-22-25-B-10N
E-GEAKB2.5-22-25-B-11N
E-GEAKB2.5-22-25-B-12N
E-GEAKB2.5-22-25-B-13N
E-GEAKB2.5-22-25-B-14N
E-GEAKB2.5-22-25-B-15N
E-GEAKB2.5-22-25-B-16N
E-GEAKB2.5-22-25-B-17N
E-GEAKB2.5-22-25-B-18N
E-GEAKB2.5-22-25-B-19N
E-GEAKB2.5-22-25-B-20N
E-GEAKB2.5-22-25-B-21N
E-GEAKB2.5-22-25-B-22N
E-GEAKB2.5-22-25-B-23N
E-GEAKB2.5-22-25-B-24N
E-GEAKB2.5-22-25-B-25N
E-GEAKB2.5-22-25-B-26N
E-GEAKB2.5-22-25-B-27N
E-GEAKB2.5-22-25-B-28N
E-GEAKB2.5-22-25-B-29N
E-GEAKB2.5-23-25-A-8N
E-GEAKB2.5-23-25-A-10K
E-GEAKB2.5-23-25-A-10N
Part NumberStandard Unit PriceMinimum order quantityVolume DiscountDays to ShipShaft Bore Dia.
(Ø)
Gear Shape Number of Teeth
(Teeth)
Surface Treatment Hole Shape

-

1 Piece(s) 7 Day(s) 21Shape B20Not ProvidedKeyway hole + Tap

-

1 Piece(s) 7 Day(s) 22Shape B20Not ProvidedKeyway hole + Tap

-

1 Piece(s) 7 Day(s) 23Shape B20Not ProvidedKeyway hole + Tap

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1 Piece(s) 7 Day(s) 8Shape A21Not ProvidedKeyway hole

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1 Piece(s) 7 Day(s) 10Shape A21Not ProvidedKeyway hole

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1 Piece(s) 7 Day(s) 10Shape A21Not ProvidedKeyway hole

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1 Piece(s) 7 Day(s) 11Shape A21Not ProvidedKeyway hole

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1 Piece(s) 7 Day(s) 12Shape A21Not ProvidedKeyway hole

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1 Piece(s) 7 Day(s) 13Shape A21Not ProvidedKeyway hole

-

1 Piece(s) 7 Day(s) 14Shape A21Not ProvidedKeyway hole

-

1 Piece(s) 7 Day(s) 15Shape A21Not ProvidedKeyway hole

-

1 Piece(s) 7 Day(s) 16Shape A21Not ProvidedKeyway hole

-

1 Piece(s) 7 Day(s) 17Shape A21Not ProvidedKeyway hole

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1 Piece(s) 7 Day(s) 18Shape A21Not ProvidedKeyway hole

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1 Piece(s) 7 Day(s) 19Shape A21Not ProvidedKeyway hole

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1 Piece(s) 7 Day(s) 20Shape A21Not ProvidedKeyway hole

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1 Piece(s) 7 Day(s) 21Shape A21Not ProvidedKeyway hole

-

1 Piece(s) 7 Day(s) 22Shape A21Not ProvidedKeyway hole

-

1 Piece(s) 7 Day(s) 23Shape A21Not ProvidedKeyway hole

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1 Piece(s) 7 Day(s) 24Shape A21Not ProvidedKeyway hole

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1 Piece(s) 7 Day(s) 25Shape A21Not ProvidedKeyway hole

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1 Piece(s) 7 Day(s) 26Shape A21Not ProvidedKeyway hole

-

1 Piece(s) 7 Day(s) 27Shape A21Not ProvidedKeyway hole

-

1 Piece(s) 7 Day(s) 8Shape B21Not ProvidedKeyway hole + Tap

-

1 Piece(s) 7 Day(s) 10Shape B21Not ProvidedKeyway hole + Tap

-

1 Piece(s) 7 Day(s) 10Shape B21Not ProvidedKeyway hole + Tap

-

1 Piece(s) 7 Day(s) 11Shape B21Not ProvidedKeyway hole + Tap

-

1 Piece(s) 7 Day(s) 12Shape B21Not ProvidedKeyway hole + Tap

-

1 Piece(s) 7 Day(s) 13Shape B21Not ProvidedKeyway hole + Tap

-

1 Piece(s) 7 Day(s) 14Shape B21Not ProvidedKeyway hole + Tap

-

1 Piece(s) 7 Day(s) 15Shape B21Not ProvidedKeyway hole + Tap

-

1 Piece(s) 7 Day(s) 16Shape B21Not ProvidedKeyway hole + Tap

-

1 Piece(s) 7 Day(s) 17Shape B21Not ProvidedKeyway hole + Tap

-

1 Piece(s) 7 Day(s) 18Shape B21Not ProvidedKeyway hole + Tap

-

1 Piece(s) 7 Day(s) 19Shape B21Not ProvidedKeyway hole + Tap

-

1 Piece(s) 7 Day(s) 20Shape B21Not ProvidedKeyway hole + Tap

-

1 Piece(s) 7 Day(s) 21Shape B21Not ProvidedKeyway hole + Tap

-

1 Piece(s) 7 Day(s) 22Shape B21Not ProvidedKeyway hole + Tap

-

1 Piece(s) 7 Day(s) 23Shape B21Not ProvidedKeyway hole + Tap

-

1 Piece(s) 7 Day(s) 24Shape B21Not ProvidedKeyway hole + Tap

-

1 Piece(s) 7 Day(s) 25Shape B21Not ProvidedKeyway hole + Tap

-

1 Piece(s) 7 Day(s) 26Shape B21Not ProvidedKeyway hole + Tap

-

1 Piece(s) 7 Day(s) 27Shape B21Not ProvidedKeyway hole + Tap

-

1 Piece(s) 7 Day(s) 8Shape A22Not ProvidedKeyway hole

-

1 Piece(s) 7 Day(s) 10Shape A22Not ProvidedKeyway hole

-

1 Piece(s) 7 Day(s) 10Shape A22Not ProvidedKeyway hole

-

1 Piece(s) 7 Day(s) 11Shape A22Not ProvidedKeyway hole

-

1 Piece(s) 7 Day(s) 12Shape A22Not ProvidedKeyway hole

-

1 Piece(s) 7 Day(s) 13Shape A22Not ProvidedKeyway hole

-

1 Piece(s) 7 Day(s) 14Shape A22Not ProvidedKeyway hole

-

1 Piece(s) 7 Day(s) 15Shape A22Not ProvidedKeyway hole

-

1 Piece(s) 7 Day(s) 16Shape A22Not ProvidedKeyway hole

-

1 Piece(s) 7 Day(s) 17Shape A22Not ProvidedKeyway hole

-

1 Piece(s) 7 Day(s) 18Shape A22Not ProvidedKeyway hole

-

1 Piece(s) 7 Day(s) 19Shape A22Not ProvidedKeyway hole

-

1 Piece(s) 7 Day(s) 20Shape A22Not ProvidedKeyway hole

-

1 Piece(s) 7 Day(s) 21Shape A22Not ProvidedKeyway hole

-

1 Piece(s) 7 Day(s) 22Shape A22Not ProvidedKeyway hole

-

1 Piece(s) 7 Day(s) 23Shape A22Not ProvidedKeyway hole

-

1 Piece(s) 7 Day(s) 24Shape A22Not ProvidedKeyway hole

-

1 Piece(s) 7 Day(s) 25Shape A22Not ProvidedKeyway hole

-

1 Piece(s) 7 Day(s) 26Shape A22Not ProvidedKeyway hole

-

1 Piece(s) 7 Day(s) 27Shape A22Not ProvidedKeyway hole

-

1 Piece(s) 7 Day(s) 28Shape A22Not ProvidedKeyway hole

-

1 Piece(s) 7 Day(s) 29Shape A22Not ProvidedKeyway hole

-

1 Piece(s) 7 Day(s) 8Shape B22Not ProvidedKeyway hole + Tap

-

1 Piece(s) 7 Day(s) 10Shape B22Not ProvidedKeyway hole + Tap

-

1 Piece(s) 7 Day(s) 10Shape B22Not ProvidedKeyway hole + Tap

-

1 Piece(s) 7 Day(s) 11Shape B22Not ProvidedKeyway hole + Tap

-

1 Piece(s) 7 Day(s) 12Shape B22Not ProvidedKeyway hole + Tap

-

1 Piece(s) 7 Day(s) 13Shape B22Not ProvidedKeyway hole + Tap

-

1 Piece(s) 7 Day(s) 14Shape B22Not ProvidedKeyway hole + Tap

-

1 Piece(s) 7 Day(s) 15Shape B22Not ProvidedKeyway hole + Tap

-

1 Piece(s) 7 Day(s) 16Shape B22Not ProvidedKeyway hole + Tap

-

1 Piece(s) 7 Day(s) 17Shape B22Not ProvidedKeyway hole + Tap

-

1 Piece(s) 7 Day(s) 18Shape B22Not ProvidedKeyway hole + Tap

-

1 Piece(s) 7 Day(s) 19Shape B22Not ProvidedKeyway hole + Tap

-

1 Piece(s) 7 Day(s) 20Shape B22Not ProvidedKeyway hole + Tap

-

1 Piece(s) 7 Day(s) 21Shape B22Not ProvidedKeyway hole + Tap

-

1 Piece(s) 7 Day(s) 22Shape B22Not ProvidedKeyway hole + Tap

-

1 Piece(s) 7 Day(s) 23Shape B22Not ProvidedKeyway hole + Tap

-

1 Piece(s) 7 Day(s) 24Shape B22Not ProvidedKeyway hole + Tap

-

1 Piece(s) 7 Day(s) 25Shape B22Not ProvidedKeyway hole + Tap

-

1 Piece(s) 7 Day(s) 26Shape B22Not ProvidedKeyway hole + Tap

-

1 Piece(s) 7 Day(s) 27Shape B22Not ProvidedKeyway hole + Tap

-

1 Piece(s) 7 Day(s) 28Shape B22Not ProvidedKeyway hole + Tap

-

1 Piece(s) 7 Day(s) 29Shape B22Not ProvidedKeyway hole + Tap

-

1 Piece(s) 7 Day(s) 8Shape A23Not ProvidedKeyway hole

-

1 Piece(s) 7 Day(s) 10Shape A23Not ProvidedKeyway hole

-

1 Piece(s) 7 Day(s) 10Shape A23Not ProvidedKeyway hole

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Dimensional Drawing
MISUMI Spur Gear Pressure Angle 20° Module 2.5 Dimension Diagram
Threading of shaft holes is not possible for Type A
Shaft Hole Specifications (Selectable Gear Shapes)
Round HoleKeyway hole
Ground Spur Gear with Round HoleGround Spur Gear with Keyway Hole
Please click Detailed Dimensions of Keyway.
The position relationship between the keyway and the teeth is not fixed.
If the gear shape is not specified, the gear shape will be B.
Specification Table
Part NumberNumber of TeethBGear ShapeShaft Hole Diameter PH8
Specified Unit: 1 mm
d
Reference Circle
Diameter
D
Tip Circle
Diameter
G
Root Circle
Diameter
HL12M
(Coarse Thread)
*1 Allowable Transmission Force
(N⋅m)
Bending Strength
TypeModuleRound Hole
Round Hole+Threaded Hole
Keyway Hole
Keyway Hole + Threaded Hole
General structural steel or carbon steel
 2.51225A

B
8 to 138N303523.752337126M538.58
148 to 158N to 12N354028.75254116849.96
158 to 208N to 15N37.542.531.253055.96
Round
E-GEAHB
E-GEAHBB


Round Hole+Threaded Hole
(Type B)
E-GEAB
E-GEABB


Keyway Hole
E-GEAKB
E-GEAKBB
168 to 228N to 17N404533.753261.98
178 to 248N to 19N42.547.536.253568.13
188 to 268N to 22N455038.753874.36
198 to 2747.552.541.253980.60
208 to 288N to 23N505543.754087.09
218 to 298N to 25N52.557.546.254293.50
228 to 328N to 29N556048.7544100.13
238 to 328N to 28N57.562.551.2546106.58
248 to 368N to 32N606553.7548113.19
258 to 388N to 33N62.567.556.2550M6119.98
268 to 438N to 37N657058.7555126.94
278 to 488N to 40N67.572.561.2560133.57
28707563.75140.86
298 to 438N to 39N72.577.566.2562147.18
308 to 518N to 43N758068.7565154.16
328 to 558N to 47N808573.7570167.17
3410 to 5510N to 47N859078.75182.65
3587.592.581.25189.48
3610 to 5710N to 49N909583.7575195.56
389510088.75210.35
4010 to 6010N to 50N10010593.7580223.66
4210511098.75238.12
44110115103.75252.85
45112.5117.5106.25260.32
46115120108.75267.86
4810 to 60120125113.7585281.94
5012 to 6012N to 50N125130118.75296.17
5215 to 6015N to 50N130135123.75310.53
54135140128.75325.04
55137.5142.5131.25333.08
56140145133.75341.19
58145150138.75354.50
6025 to 6025N to 50N150155143.75369.44
62155160148.75382.84
64160165153.75398.01
65162.5167.5156.25404.75
68170175163.75428.78
70175180168.75442.41
72180185173.75456.04
75187.5192.5181.25478.65
80200205193.75396.36
When selecting a shaft hole diameter of 10 with keyway hole + threaded hole and a keyway width of 4.0 mm (height 1.8 mm), please specify the P dimension as 10K. For details, please refer to Keyway Specifications
*1 The allowable transmission force in the table is a reference value calculated under normal conditions. For details, please refer to Gear Transmission Power Calculation
When using keyway holes + threaded holes, the shaft hole diameter 9N specification cannot be manufactured.
Material Specifications
Type Material Surface Treatment
Round HoleRound Hole+Threaded HoleKeyway Hole
Keyway Hole + Threaded Hole
E-GEAHBE-GEABE-GEAKBGeneral structural steel or carbon steel-
E-GEAHBBE-GEABBE-GEAKBBFerroferric Oxide Protective Film
If there are requirements for rust prevention, give priority to products with surface treatment of electroless nickel plating or those made of austenitic stainless steel.

Basic Information

Module 2.5 Tooth Width B(mm) 25 Material General Structural Steel or Carbon Steel
Heat Treatment Not Provided Ground Tooth Not Provided Bearing Not Provided
Backlash Provided Shaft Bore Tolerance H8 Bushing Not Provided
Accuracy(Old JIS) JIS B 1702-1 Class 8

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