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Spur Gear, Pressure Angle 20°, Module 2.5

MISUMI

MiSUMi Economy

MISUMI

Part Number

Configured Part Number is shown.

Drawing
Part Numbers
Specifications

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 Hole	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 Hole	Keyway
E-GEAHB	E-GEAKB	General structural steel or carbon steel	-
E-GEAHBB	E-GEAKBB		Black 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 Transmission	Description	Transmission Diagram (Simple)	Representative Transmission Methods	Representative Types of Transmission Pairings
Parallel Transmission	Parallel transmission of rotation/power between two axes with meshing gears			Spur Gear + Spur Gear Helical Gear + Helical Gear Herringbone Gear + Herringbone Gear Spur Gear + Internal Gear Helical Gear + Internal Helical Gear
Linear Transmission	Rotational displacement/power transmitted linearly, or linear displacement/power transmitted rotationally			Spur Gear + Spur Rack Helical Gear + Helical Rack

Precautions

①	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
②	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.
③	When selecting the shaft hole specification without threads, the fixing screws are not included.
④	The position relationship between the keyway and the teeth is not fixed.

Example of Use

■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

Automotive	Robotics	Lithium battery

Related Documents

MISUMI Gear Overview
MISUMI Gear Basic Knowledge
MISUMI Gear Design Option Information
MISUMI Gear Specification Selection Steps
MISUMI Gear Performance Features

: 30; 45; 60

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Part Number
E-GEAB2.5-12-25-B-[8-13/1]
E-GEAB2.5-13-25-B-[8-13/1]
E-GEAB2.5-14-25-[8-15/1]
E-GEAB2.5-14-25-B-[8-15/1]
E-GEAB2.5-15-25-[8-20/1]
E-GEAB2.5-15-25-B-[8-20/1]
E-GEAB2.5-16-25-[8-22/1]
E-GEAB2.5-16-25-B-[8-22/1]
E-GEAB2.5-17-25-B-[8-24/1]
E-GEAB2.5-18-25-[8-26/1]
E-GEAB2.5-18-25-B-[8-26/1]
E-GEAB2.5-19-25-B-[8-27/1]
E-GEAB2.5-20-25-[8-28/1]
E-GEAB2.5-20-25-B-[8-28/1]
E-GEAB2.5-21-25-B-[8-29/1]
E-GEAB2.5-22-25-B-[8-30/1]
E-GEAB2.5-23-25-B-[8-32/1]
E-GEAB2.5-24-25-[8-33/1]
E-GEAB2.5-24-25-B-[8-33/1]
E-GEAB2.5-25-25-[8-35/1]
E-GEAB2.5-25-25-B-[8-35/1]
E-GEAB2.5-26-25-B-[8-38/1]
E-GEAB2.5-27-25-B-[8-42/1]
E-GEAB2.5-28-25-[8-42/1]
E-GEAB2.5-28-25-B-[8-42/1]
E-GEAB2.5-29-25-B-[8-43/1]
E-GEAB2.5-30-25-[8-45/1]
E-GEAB2.5-30-25-B-[8-45/1]
E-GEAB2.5-32-25-[8-49/1]
E-GEAB2.5-32-25-B-[8-55/1]
E-GEAB2.5-33-25-B-[8-55/1]
E-GEAB2.5-34-25-B-[10-49/1]
E-GEAB2.5-35-25-B-[10-49/1]
E-GEAB2.5-36-25-[10-52/1]
E-GEAB2.5-36-25-B-[10-52/1]
E-GEAB2.5-38-25-B-[10-56/1]
E-GEAB2.5-39-25-B-[10-57/1]
E-GEAB2.5-40-25-[10-56/1]
E-GEAB2.5-40-25-B-[10-56/1]
E-GEAB2.5-42-25-B-[10-56/1]
E-GEAB2.5-44-25-B-[10-56/1]
E-GEAB2.5-45-25-B-[10-56/1]
E-GEAB2.5-46-25-B-[10-56/1]
E-GEAB2.5-48-25-[10-59/1]
E-GEAB2.5-48-25-B-[10-59/1]
E-GEAB2.5-49-25-B-[10-60/1]
E-GEAB2.5-50-25-[12-59/1]
E-GEAB2.5-50-25-B-[12-59/1]
E-GEAB2.5-51-25-B-[12-60/1]
E-GEAB2.5-52-25-B-[15-59/1]
E-GEAB2.5-54-25-B-[15-59/1]
E-GEAB2.5-55-25-B-[15-59/1]
E-GEAB2.5-56-25-B-[15-59/1]
E-GEAB2.5-57-25-B-[15-60/1]
E-GEAB2.5-58-25-B-[15-59/1]
E-GEAB2.5-60-25-B-[25-59/1]
E-GEABB2.5-12-25-B-[8-13/1]
E-GEABB2.5-13-25-B-[8-13/1]
E-GEABB2.5-14-25-[8-15/1]
E-GEABB2.5-14-25-B-[8-15/1]

Standard Unit Price	Minimum order quantity	Days to Ship	Shaft Bore Dia. (Ø)	Gear Shape	Number of Teeth (Teeth)	Surface Treatment	Hole Shape
-	1 Piece(s)	7 Day(s)	8 ～ 13	Shape B	12	Not Provided	Straight Round Hole + Tap
-	1 Piece(s)	7 Day(s)	8 ～ 13	Shape B	13	Not Provided	Straight Round Hole + Tap
-	1 Piece(s)	7 Day(s)	8 ～ 15	-	14	Not Provided	Straight Round Hole + Tap
-	1 Piece(s)	7 Day(s)	8 ～ 15	Shape B	14	Not Provided	Straight Round Hole + Tap
-	1 Piece(s)	7 Day(s)	8 ～ 20	-	15	Not Provided	Straight Round Hole + Tap
-	1 Piece(s)	7 Day(s)	8 ～ 20	Shape B	15	Not Provided	Straight Round Hole + Tap
-	1 Piece(s)	7 Day(s)	8 ～ 22	-	16	Not Provided	Straight Round Hole + Tap
-	1 Piece(s)	7 Day(s)	8 ～ 22	Shape B	16	Not Provided	Straight Round Hole + Tap
-	1 Piece(s)	7 Day(s)	8 ～ 24	Shape B	17	Not Provided	Straight Round Hole + Tap
-	1 Piece(s)	7 Day(s)	8 ～ 26	-	18	Not Provided	Straight Round Hole + Tap
-	1 Piece(s)	7 Day(s)	8 ～ 26	Shape B	18	Not Provided	Straight Round Hole + Tap
-	1 Piece(s)	7 Day(s)	8 ～ 27	Shape B	19	Not Provided	Straight Round Hole + Tap
-	1 Piece(s)	7 Day(s)	8 ～ 28	-	20	Not Provided	Straight Round Hole + Tap
-	1 Piece(s)	7 Day(s)	8 ～ 28	Shape B	20	Not Provided	Straight Round Hole + Tap
-	1 Piece(s)	7 Day(s)	8 ～ 29	Shape B	21	Not Provided	Straight Round Hole + Tap
-	1 Piece(s)	7 Day(s)	8 ～ 30	Shape B	22	Not Provided	Straight Round Hole + Tap
-	1 Piece(s)	7 Day(s)	8 ～ 32	Shape B	23	Not Provided	Straight Round Hole + Tap
-	1 Piece(s)	7 Day(s)	8 ～ 33	-	24	Not Provided	Straight Round Hole + Tap
-	1 Piece(s)	7 Day(s)	8 ～ 33	Shape B	24	Not Provided	Straight Round Hole + Tap
-	1 Piece(s)	7 Day(s)	8 ～ 35	-	25	Not Provided	Straight Round Hole + Tap
-	1 Piece(s)	7 Day(s)	8 ～ 35	Shape B	25	Not Provided	Straight Round Hole + Tap
-	1 Piece(s)	7 Day(s)	8 ～ 38	Shape B	26	Not Provided	Straight Round Hole + Tap
-	1 Piece(s)	7 Day(s)	8 ～ 42	Shape B	27	Not Provided	Straight Round Hole + Tap
-	1 Piece(s)	7 Day(s)	8 ～ 42	-	28	Not Provided	Straight Round Hole + Tap
-	1 Piece(s)	7 Day(s)	8 ～ 42	Shape B	28	Not Provided	Straight Round Hole + Tap
-	1 Piece(s)	7 Day(s)	8 ～ 43	Shape B	29	Not Provided	Straight Round Hole + Tap
-	1 Piece(s)	7 Day(s)	8 ～ 45	-	30	Not Provided	Straight Round Hole + Tap
-	1 Piece(s)	7 Day(s)	8 ～ 45	Shape B	30	Not Provided	Straight Round Hole + Tap
-	1 Piece(s)	7 Day(s)	8 ～ 49	-	32	Not Provided	Straight Round Hole + Tap
-	1 Piece(s)	7 Day(s)	8 ～ 55	Shape B	32	Not Provided	Straight Round Hole + Tap
-	1 Piece(s)	7 Day(s)	8 ～ 55	Shape B	33	Not Provided	Straight Round Hole + Tap
-	1 Piece(s)	7 Day(s)	10 ～ 49	Shape B	34	Not Provided	Straight Round Hole + Tap
-	1 Piece(s)	7 Day(s)	10 ～ 49	Shape B	35	Not Provided	Straight Round Hole + Tap
-	1 Piece(s)	7 Day(s)	10 ～ 52	-	36	Not Provided	Straight Round Hole + Tap
-	1 Piece(s)	7 Day(s)	10 ～ 52	Shape B	36	Not Provided	Straight Round Hole + Tap
-	1 Piece(s)	7 Day(s)	10 ～ 56	Shape B	38	Not Provided	Straight Round Hole + Tap
-	1 Piece(s)	7 Day(s)	10 ～ 57	Shape B	39	Not Provided	Straight Round Hole + Tap
-	1 Piece(s)	7 Day(s)	10 ～ 56	-	40	Not Provided	Straight Round Hole + Tap
-	1 Piece(s)	7 Day(s)	10 ～ 56	Shape B	40	Not Provided	Straight Round Hole + Tap
-	1 Piece(s)	7 Day(s)	10 ～ 56	Shape B	42	Not Provided	Straight Round Hole + Tap
-	1 Piece(s)	7 Day(s)	10 ～ 56	Shape B	44	Not Provided	Straight Round Hole + Tap
-	1 Piece(s)	7 Day(s)	10 ～ 56	Shape B	45	Not Provided	Straight Round Hole + Tap
-	1 Piece(s)	7 Day(s)	10 ～ 56	Shape B	46	Not Provided	Straight Round Hole + Tap
-	1 Piece(s)	7 Day(s)	10 ～ 59	-	48	Not Provided	Straight Round Hole + Tap
-	1 Piece(s)	7 Day(s)	10 ～ 59	Shape B	48	Not Provided	Straight Round Hole + Tap
-	1 Piece(s)	7 Day(s)	10 ～ 60	Shape B	49	Not Provided	Straight Round Hole + Tap
-	1 Piece(s)	7 Day(s)	12 ～ 59	-	50	Not Provided	Straight Round Hole + Tap
-	1 Piece(s)	7 Day(s)	12 ～ 59	Shape B	50	Not Provided	Straight Round Hole + Tap
-	1 Piece(s)	7 Day(s)	12 ～ 60	Shape B	51	Not Provided	Straight Round Hole + Tap
-	1 Piece(s)	7 Day(s)	15 ～ 59	Shape B	52	Not Provided	Straight Round Hole + Tap
-	1 Piece(s)	7 Day(s)	15 ～ 59	Shape B	54	Not Provided	Straight Round Hole + Tap
-	1 Piece(s)	7 Day(s)	15 ～ 59	Shape B	55	Not Provided	Straight Round Hole + Tap
-	1 Piece(s)	7 Day(s)	15 ～ 59	Shape B	56	Not Provided	Straight Round Hole + Tap
-	1 Piece(s)	7 Day(s)	15 ～ 60	Shape B	57	Not Provided	Straight Round Hole + Tap
-	1 Piece(s)	7 Day(s)	15 ～ 59	Shape B	58	Not Provided	Straight Round Hole + Tap
-	1 Piece(s)	7 Day(s)	25 ～ 59	Shape B	60	Not Provided	Straight Round Hole + Tap
-	1 Piece(s)	7 Day(s)	8 ～ 13	Shape B	12	Black Oxide	Straight Round Hole + Tap
-	1 Piece(s)	7 Day(s)	8 ～ 13	Shape B	13	Black Oxide	Straight Round Hole + Tap
-	1 Piece(s)	7 Day(s)	8 ～ 15	-	14	Black Oxide	Straight Round Hole + Tap
-	1 Piece(s)	7 Day(s)	8 ～ 15	Shape B	14	Black Oxide	Straight Round Hole + Tap

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Dimensional Drawing

Threading of shaft holes is not possible for Type A

Shaft Hole Specifications (Selectable Gear Shapes)
Round Hole	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 Number		Number of Teeth	B	Gear Shape	Shaft Hole Diameter P_H8 Specified Unit: 1 mm		d Reference Circle Diameter	D Tip Circle Diameter	G Root Circle Diameter	H	L	ℓ₁	ℓ₂	M (Coarse Thread)	*1 Allowable Transmission Force (N⋅m) Bending Strength
Type	Module	Number of Teeth	B	Gear Shape	Round Hole Round Hole+Threaded Hole	Keyway Hole Keyway Hole + Threaded Hole	d Reference Circle Diameter	D Tip Circle Diameter	G Root Circle Diameter	H	L	ℓ₁	ℓ₂	M (Coarse Thread)	General structural steel or carbon steel
	2.5	12	25	A B	8 to 13	8N	30	35	23.75	23	37	12	6	M5	38.58
		14			8 to 15	8N to 12N	35	40	28.75	25	41	16	8		49.96
		15			8 to 20	8N to 15N	37.5	42.5	31.25	30					55.96
Round E-GEAHB E-GEAHBB Round Hole+Threaded Hole (Type B) E-GEAB E-GEABB Keyway Hole E-GEAKB E-GEAKBB		16			8 to 22	8N to 17N	40	45	33.75	32					61.98
		17			8 to 24	8N to 19N	42.5	47.5	36.25	35					68.13
		18			8 to 26	8N to 22N	45	50	38.75	38					74.36
		19			8 to 27	8N to 22N	47.5	52.5	41.25	39					80.60
		20			8 to 28	8N to 23N	50	55	43.75	40					87.09
		21			8 to 29	8N to 25N	52.5	57.5	46.25	42					93.50
		22			8 to 32	8N to 29N	55	60	48.75	44					100.13
		23			8 to 32	8N to 28N	57.5	62.5	51.25	46					106.58
		24			8 to 36	8N to 32N	60	65	53.75	48					113.19
		25			8 to 38	8N to 33N	62.5	67.5	56.25	50				M6	119.98
		26			8 to 43	8N to 37N	65	70	58.75	55					126.94
		27			8 to 48	8N to 40N	67.5	72.5	61.25	60					133.57
		28			8 to 48	8N to 40N	70	75	63.75	60					140.86
		29			8 to 43	8N to 39N	72.5	77.5	66.25	62					147.18
		30			8 to 51	8N to 43N	75	80	68.75	65					154.16
		32			8 to 55	8N to 47N	80	85	73.75	70					167.17
		34			10 to 55	10N to 47N	85	90	78.75						182.65
		35			10 to 55	10N to 47N	87.5	92.5	81.25						189.48
		36			10 to 57	10N to 49N	90	95	83.75	75					195.56
		38			10 to 57	10N to 49N	95	100	88.75	75					210.35
		40			10 to 60	10N to 50N	100	105	93.75	80					223.66
		42					105	110	98.75						238.12
		44					110	115	103.75						252.85
		45					112.5	117.5	106.25						260.32
		46					115	120	108.75						267.86
		48			10 to 60		120	125	113.75	85					281.94
		50			12 to 60	12N to 50N	125	130	118.75						296.17
		52			15 to 60	15N to 50N	130	135	123.75						310.53
		54					135	140	128.75						325.04
		55					137.5	142.5	131.25						333.08
		56					140	145	133.75						341.19
		58					145	150	138.75						354.50
		60			25 to 60	25N to 50N	150	155	143.75						369.44
		62					155	160	148.75						382.84
		64					160	165	153.75						398.01
		65					162.5	167.5	156.25						404.75
		68					170	175	163.75						428.78
		70					175	180	168.75						442.41
		72					180	185	173.75						456.04
		75					187.5	192.5	181.25						478.65
		80					200	205	193.75						396.36

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 Hole	Round Hole+Threaded Hole	Keyway Hole Keyway Hole + Threaded Hole	Material	Surface Treatment
E-GEAHB	E-GEAB	E-GEAKB	General structural steel or carbon steel	-
E-GEAHBB	E-GEABB	E-GEAKBB	General structural steel or carbon steel	Ferroferric 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.

Please refer to

Surface Treatment and Rust Prevention Methods

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

Configure

4,799 Part Numbers

View Part Numbers

Configure Remaining Specifications

Completed

Specification/Dimensions

Shaft Bore Dia.(Ø)
8

10

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12

13

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50
[8-60/1Ø Unit(s)]
Clear
Gear Shape
- Shape A
- Shape B
Clear
Number of Teeth(Teeth)
12

13

14

15

16

17

18

19

20

21

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60
Clear
Surface Treatment
- Not Provided
- Black Oxide
- Electroless Nickel Plating
Clear
Hole Shape
- Keyway hole
- Keyway hole + Tap
- Straight Round Hole
- Straight Round Hole + Tap
Clear
type
- E-GEAB2.5
- E-GEABB2.5
- E-GEAHB2.5
- E-GEAHBB2.5
- E-GEAHBG2.5
- E-GEAKB2.5
- E-GEAKBB2.5
Clear

Days to Ship

All

7 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 .

Additional Products in this Category

Tech Support

: Technical Inquiry

(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

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

How can we improve?

Spur Gear, Pressure Angle 20°, Module 2.5

Basic Information

Configure

Specification/Dimensions

Shaft Bore Dia.(Ø)

Gear Shape

Number of Teeth(Teeth)

Surface Treatment

Hole Shape

type

Days to Ship

Specify Alterations

Additional Products in this Category

Tech Support

Payment Method

About MISUMI

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Customer Service

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MISUMI Contact 9am – 6pm (Mon – Fri) * Order cut-off time is 5pm, 9am – 1pm(Sat) * Order cut-off time is 12pm