Spur Gears / Contact Angle 20 Degrees / Module 2.5 (Part Numbers - CAD Download)

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Drawing / Specifications
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Part Numbers
Catalog

Dimensional Drawing

Shape A

[NG] Tapped shaft bores are not available for Shape A

Shape B

Shaft Bore Specifications (Selectable Gear Shapes)
Straight Bore (Shape A, Shape B)	Straight Bore + Tap (Shape B)

Keyway (Shape A)	Keyway + Tap (Shape B)

[!] Relative positioning of keyway and teeth is not fixed.
　　To match, specify GBA for alteration.
Tooth surface accuracy Equivalent to the new JIS B 1702-1 Class 8
(Old JIS B 1702 Class 4)

Keyway Dimensional Tolerance

T Dim. Tolerance (H7)

Nominal	P_H7
8 N to 10K	+0.015 　0
11 N to 18 N	+0.018 0
19 N to 30 N	+0.021 0
31 N to 50 N	+0.025 0

[ ! ] Compliant with JIS B 0401-2.

Keyway Dimensional Tolerance

Nominal	b_JS9		t
8 N to 10 N	3	±0.0125	1.4	+0.1 0
10K to 12 N	4	±0.0150	1.8
13 N to 17 N	5		2.3
18 N to 22 N	6		2.8
23 N to 30 N	8	±0.0180	3.3	+0.2 0
31 N to 38 N	10	±0.0180
39 N to 44 N	12	±0.0215
45 N to 50 N	14	±0.0215	3.8

[ ! ] Compliant with JIS B 1301.

Unspecified Dimension Tolerance (Other than the teeth)

Dimension Range		Tolerance (mm)
Over	or Less	Tolerance (mm)
0.5	3	±0.1
3	6	±0.1
6	30	±0.2
30	120	±0.3
120	400	±0.5

[ ! ] Compliant with JIS B 0405 Class m (intermediate).

Type			[M] Material	[S] Surface Treatment	[A]Accessory
Straight Bore	Straight Bore + Tap	Keyway, Keyway + Tap	[M] Material	[S] Surface Treatment	[A]Accessory
GEAHB	GEAB	GEAKB	EN 1.1191 Equiv.	—	Set Screw (EN 1.7220 Equiv., Black Oxide)
GEAHBB	GEABB	GEAKBB		Black Oxide
GEAHBG	GEABG	GEAKBG		Electroless Nickel Plating
GEAHS	GEAS	GEAKS	EN 1.4301 Equiv.	—	Set Screw (EN 1.4301 Equiv.)

[ ! ] The set screw is not included only for shaft bore specification "Straight Bore."
[ ! ] The set screw is included for shaft hole specification "Tapped."

Specification Table

Part Number	—	Number of Teeth	—	B	—	Gear Shape	—	P
GEAB2.5 GEAKB2.5	— —	15 30	— —	25 25	— —	B A	— —	8 10 N

Part Number		Number of Teeth	B	Gear Shape	Shaft Bore Dia. P_H7 Unit: mm		d Reference Circle Dia.	D Addendum Circle Dia.	G Dedendum Circle Dia.	H	L	ℓ₁	ℓ₂	M (Coarse)	* 1 Allowable Transmission Force (N⋅m) Bending Strength
Type	Module	Number of Teeth	B	Gear Shape	Straight Bore Straight Bore + Tap	Keyway Keyway + Tap	d Reference Circle Dia.	D Addendum Circle Dia.	G Dedendum Circle Dia.	H	L	ℓ₁	ℓ₂	M (Coarse)	S45C Equivalent	SUS304
Straight Bore (Shape A, Shape B) GEAHB GEAHBB GEAHBG GEAHS Straight Bore + Tap (Shape B) GEAB GEABB GEABG GEAS Keyway (Shape A) Keyway + Tap (Shape B) GEAKB GEAKBB GEAKBG GEAKS	2.5	12	20 25	A B	8 to 13	8 N	30	35	23.75	23	32 (B=20) 37 (B=25)	12	6	M5	30.86	17.61
		13			8 to 13	8 N	32.5	37.5	26.25	23	32 (B=20) 37 (B=25)	12	6		35.38	20.19
		14			8 to 15	8 N to 12 N・10K	35	40	28.75	25	36 (B=20) 41 (B=25)	16	8		40.03	22.85
		15			8 to 20	8 N to 15 N・10K	37.5	42.5	31.25	30					44.78	25.55
		16			8 to 22	8 N to 17 N・10K	40	45	33.75	32					49.60	28.30
		17			8 to 24	8 N to 19 N・10K	42.5	47.5	36.25	35					54.51	31.10
		18			8 to 26	8 N to 22 N・10K	45	50	38.75	38					59.50	33.95
		19			8 to 27	8 N to 22 N・10K	47.5	52.5	41.25	39					64.54	36.82
		20			8 to 28	8 N to 23 N・10K	50	55	43.75	40					69.63	39.74
		21			8 to 30	8 N to 27 N・10K	52.5	57.5	46.25	42					74.76	42.66
		22			8 to 32	8 N to 29 N・10K	55	60	48.75	44					79.97	45.63
		23			8 to 34	8 N to 30 N・10K	57.5	62.5	51.25	46					85.18	48.61
		24			8 to 36	8 N to 32 N・10K	60	65	53.75	48					90.46	51.62
		25			8 to 38	8 N to 33 N・10K	62.5	67.5	56.25	50				M6	95.78	54.66
		26			8 to 43	8 N to 37 N・10K	65	70	58.75	55					101.10	57.70
		27			8 to 48	8 N to 40 N・10K	67.5	72.5	61.25	60					106.50	60.78
		28			8 to 48	8 N to 40 N・10K	70	75	63.75	60					111.92	63.87
		29			8 to 49	8 N to 41 N・10K	72.5	77.5	66.25	62					117.35	66.97
		30			8 to 51	8 N to 43 N・10K	75	80	68.75	65					122.78	70.06
		32			8 to 55	8 N to 47 N・10K	80	85	73.75	70					133.78	76.34
		33			8 to 55	8 N to 47 N・10K	82.5	87.5	76.25						139.28	79.48
		34			10 to 55	10 N to 47 N 10K	85	90	78.75						144.86	82.66
		35			10 to 55	10 N to 47 N 10K	87.5	92.5	81.25						150.39	85.82
		36			10 to 57	10 N to 49 N 10K	90	95	83.75	75					155.98	89.01
		38					95	100	88.75						167.22	95.42
		39					97.5	102.5	91.25						172.86	98.64
		40			10 to 60	10 N to 50 N 10K	100	105	93.75	80					178.46	101.84
		42					105	110	98.75						189.76	108.29
		44					110	115	103.75						201.16	114.79
		45					112.5	117.5	106.25						206.83	118.03
		46					115	120	108.75						212.54	121.29
		48					120	125	113.75	85					224.00	127.82
		49					122.5	127.5	116.25						229.73	131.10
		50			12 to 60	12 N to 50 N	125	130	118.75						235.50	134.38
		51			12 to 60	15 N to 50 N	127.5	132.5	121.25						241.19	137.64
		52			15 to 60		130	135	123.75						246.91	140.90
		54					135	140	128.75						258.45	147.49
		55					137.5	142.5	131.25						264.26	150.80
		56					140	145	133.75						270.10	154.13
		57					142.5	147.5	136.25						275.85	157.41
		58					145	150	138.75						281.62	160.70
		60			25 to 60	25 N to 50 N	150	155	143.75						293.22	167.33
		62					155	160	148.75						304.93	174.01
		63					157.5	162.5	151.25						310.68	177.29
		64					160	165	153.75						316.58	180.66
		65					162.5	167.5	156.25						322.38	183.96
		66					165	170	158.75						328.18	187.28
		68					170	175	163.75						339.84	193.93
		69					172.5	177.5	166.25						345.70	197.27
		70					175	180	168.75						351.58	200.63
		72					180	185	173.75						363.22	207.27
		75					187.5	192.5	181.25						380.88	217.35
		76					190	195	183.75						386.69	220.66
		77					192.5	197.5	186.25						302.06	172.37
		78					195	200	188.75						306.54	174.93
		80					200	205	193.75						315.54	180.06

[NG] Shaft bore diameter 9N is not available for Keyway Bore + Tap.
[!] Specify 10K as P dimension if keyway width of 4.0 mm (height 1.8 mm) for Keyway + Tap with shaft bore diameter of 10 is desired.
* 1 Allowable Transmission Forces in the table are reference values calculated by assuming a tooth width as 20 mm under the prescribed conditions.

Alterations

Set Screw Alteration

Tapped Hole Dimension Change

Root matching

Code

KC90·KC120

TPC

GBA

Spec.

KC90: Adds another set screw at 90° position.
KC120: Adds another set screw at 120° position.
A set screw is added.
Ordering Code KC90
Applicable Conditions [NG] Not applicable to Shape A [NG] Not applicable to Straight Bore Type
KC90 KC20

Changes the tapped hole dimension.
Ordering Code TPC4
Applicable Conditions [NG] Not applicable to Shape A [NG] Not applicable to Straight Bore Type
Standard Conditions [ ! ] ℓ₁ - ℓ₂ > TPC/2

Align the bottom of the gear tooth with the keyway and tap phase.
Phase Adjustment Tolerance ±0.3 (Reference Value)
Ordering Code GBA
Applicable Conditions [ ! ] Applicable to 19 teeth or more

M	TPC
M4	M3 M5
M5	M4 M6

Alterations

Stepped Hole

Both Ends Stepped Hole

Hub Cut

Code

DHL·DHR

WDH

Spec.

Changes shaft bores to stepped bores.
Dimension Increments Z: 1 mm Increments J: 0.1 mm Increments
Ordering Code DHL-Z20-4.0
Applicable Conditions [ ! ] Applicable only to Straight Bore Type [NG] Not applicable to Shape K
Standard conditions

·DHL	·DHR
[ ! ] Shape A P + 2 ≤ Z ≤ G－4, 2 ≤ J ≤ B－3	[ ! ] Shape A P + 2 ≤ Z ≤ G－4, 2 ≤ J ≤ B－3
[ ! ] Shape B P + 2 ≤ Z ≤ G - 4,2 ≤ J ≤ L - 3	[ ! ] Shape B P + 2 ≤ Z ≤ H−4, 2 ≤ J ≤ ℓ₁

Changes shaft bores to both ends stepped hole.
Dimension Increments Q, R, S, T: 1 mm Increments S, T ≥ 3
Ordering Code WDH-Q10-R10-S3-T3
Applicable Conditions [ ! ] Applicable only to Straight Bore Type [NG] Not applicable to Shape K
Standard conditions

·Shape A	· Shape B
[ ! ]P+2 ≤ Q,R ≤ G－4	[ ! ]P+2 ≤ Q,R ≤ H－4
[ ! ]S+T ≤ B－3	[ ! ] S + T ≤ L - 3 Shaft hole Dia. P is general tolerance

Cuts the hub length to the specified length.
Increments 0.5 mm
Ordering Code BS6.5
Applicable Conditions [NG] Not applicable to Shape A, K
Standard conditions
[!] Straight Bore: 0 ≤ BS ≤ ℓ₁
[!] Straight Bore + Tapped Type: BS=0;
M+3 ≤ BS ≤ ℓ₁
" ! " Keyway + Tapped Type: BS=0;
M+3 ≤ BS ≤ ℓ₁
[ ! ] If BS = 0, no tapped hole

Alterations

Retaining Ring Groove Dim.

Side Slotted Hole

Code

SRG

LFC·LTC

Spec.

Retaining Ring Groove applicable to the shaft dia. of stepped hole is machined.
Dimension Increments 3.5 to 0.5 mm
Ordering Code SRG7
Applicable Conditions
[ ! ] Applicable only to shaft bore specifications DHL and DHR
[ ! ] Standards of retaining ring groove for Z dim. is applied
Standard conditions
[ ! ] n ≤ J-SRG-m

■Retaining Ring Groove Dim.

					n (Min.)						n (Min.)
Z_H7	d₂	Tolerance	m	Tolerance	n (Min.)	Z_H7	d₂	Tolerance	m	Tolerance	n (Min.)
10	10.4	+0.11 0	1.15	+0.14 0	1.5	24	25.2	+0.21 0	1.35	+0.14 0	1.5
11	11.4					25	26.2
12	12.5					26	27.2
13	13.6					28	29.4
14	14.6					30	31.4	+0.25 0
15	15.7					32	33.7
16	16.8					35	37		1.65		2
17	17.8					37	39		1.65
19	20	+0.21 0				40	42.5		1.9
20	21					42	44.5
21	22					45	47.5
22	23					47	49.5
						52	55	+0.3 0	2.2	+0.14 0	2
						55	58
						60	63
						62	65
						68	71		2.7		2.5
						72	75
						80	83.5	+0.35 0

Machines slotted holes on the side surface (30°).
Dimension Increments LFC, LTC: 1 mm Increments
Select M M3, M4, M5, M6
Ordering Code LFC20-M3
Applicable Conditions [ ! ] Applicable to Shape A only
Standard Conditions [ ! ] P + C + 4 ≤ LFC (LTC) ≤ G - C- 4

M	C
M3	3.5
M4	4.5
M5	5.5
M6	6.5

Alterations

Side Through Hole

Side Tapped Hole

Side Counterbored

Code

KFC·KTC

QFC·QTC

ZFC·ZTC

Spec.

Machines through holes on the side surface.
Increments KFC, KTC: 1 mm Increments
K: 0.5 mm Increments
K selection K3.0 to K6.0
Ordering Code KFC20-K3.5
Applicable Conditions [NG] Not applicable to Shape K
Shape A
Standard Conditions [ ! ] P + K + 4 ≤ KFC (KTC) ≤ G - K - 4

Machines tapped holes on the side surface of the gear.
Dimension Increments QFC, QTC: 1 mm Increments
Select M M3, M4 [ ! ] Tapped hole depth M × 2.0
(When B < M × 2.0, through)
Machining datum plane selection is required for Shape B, L-side specification symbol LL,
R-side specification symbol RR
Applicable Conditions [NG] Not applicable to Shape K
Shape A
Ordering Code QFC25-M3
Standard Conditions [ ! ] P + M + 4 ≤ QFC (QTC) ≤ G - M - 4

Machines counterbored holes on the side surface.
Dimension Increments ZFC, ZTC: 1 mm Increments
Select U U3, U4, U5, U6
Machining datum plane selection required for Shape B, L-side specification symbol LL, R-side specification symbol RR
Applicable Conditions [ ! ] Applicable to Standard Type only
[NG] Not applicable to Shape K
Shape A
Ordering Code ZFC20-U3
Standard conditions [ ! ] P + U₁ + 3 ≤ ZFC (ZTC) ≤ G - U₁- 4

U Selection	U₁	U₂	F
3	6.5	3.5	3.5
4	8	4.5	4.5
5	9.5	5.5	5.5
6	11	6.5	6.5

Shape B
Standard conditions [ ! ] P + K + 4 ≤ KFC (KTC) ≤ H - K - 4
[ ! ]H+K+4 ≤ KFC (KTC) ≤ G－K－4

Shape B
Ordering Code R-side specification: QFC25-M3-RR, L-side specification: QFC25－M3－LL
Standard Conditions [ ! ] P + M + 4 ≤ QFC (QTC) ≤ H - M - 4
[ ! ]H+M+4 ≤ QFC (QTC) ≤ G－M－4

Shape B
Ordering Code R-side specification: ZFC20-U3-RR, L-side specification: ZFC20－U3－LL
Standard Conditions [ ! ] P + U₁ + 3 ≤ ZFC (ZTC) ≤ H - U₁-4
[ ! ]H+U₁+4 ≤ ZFC (ZTC) ≤ G－U₁－4

[!] Conditions may vary depending on the shaft bore specs.

General Information - Spur Gears

Spur gears - front gear with through hole - spur gear with spring pin - spur gear made of brass - brass pinion - plastic - spur gear with ball bearing

Selection details of spur gears

- Material: steel, stainless steel, sintered steel, nylon, polyacetal, brass, aluminum, cast iron

- Coatings: burnished, nickel-plated

- Heat treatment: induction hardened

- Shaft diameter tolerances: H7, H8

- Tooth flank clearance: N5, N7, N8, N9, N12

- Module: 0.3, 0.5, 0.75, 0.8, 1, 1.25, 1.5, 2, 2.5, 3, 4, 4.5, 5, 6, 8, 10, 15, 20

- Pressure angle: 20°

- Shaft diameter: 2 mm to 50 mm

- Number of teeth: 8 to 200

- Tooth width: 2 mm to 90 mm

Description/Basics

The spur gears offered are generally machine elements that serve the non-slip transmission of force, movement transmission or movement change. The teeth of the cylinder wheels grip each other during transmission and largely roll over the tooth flanks. The tooth shape of the spur gear is convexly shaped in the shaped tooth system. At the beginning of the intervention, a rolling resistance acts on the tooth flank, which becomes a sliding friction in the course of the rotation.

A combination of gear wheels and rack gears is useful in the construction of rack gear. This allows motor rotary motion or other rotary motion to be converted into linear motion. rack gear boxes are theoretically possible in an endless assembly. Limits here only set the length of the rack gears for the rack gear drive.

Gear wheels with straight gearing are particularly suitable for the construction of gearboxes. The advantage of straight gearing as opposed to helical gears, is the possibility of transmitting a higher torque. It should be noted that with increasing speed within the transmission ratio or reduction, the torque to be transmitted decreases.

When designing spur gear pairs, the ratio of the gear ratio (number of teeth) and the module of the respective gear wheels must be observed.
The backlash is another important factor that must be considered during construction. Reverse play is understood as the result of the play that the change in the direction of rotation of a single gear wheel pair between the teeth. The risk of reverse play can be reduced if either the diameter or the number of teeth of the cogwheel pairing do not deviate too much from one another. If high wear is to be expected due to the pairing of gears, the MISUMI online shop offers gears with a hardened key-type.

For applications with the same rotational direction, it is possible to use an intermediate gear with integrated bearing on a cantilever shaft. The bearing number used can be found under the tab More Information. An overview of tolerances and permissible radial bearing deviations can be found in the following PDF.

In addition to gear wheels, MISUMI also offers suitable rotary shafts for the construction of a transmission. The straight front wheels can be assembled on these and secured with a set screw or machine keys (key with adjusting screw). This PDF provides an overview of the configurable mountings for the shaft rotation and keyway tolerances.
The continuous adjusting of a spur gear can be realized, among other things, by means of a clamping sleeve. The MISUMI online shop offers spur gears with clamping sleeve. Alternatively, we also offer individual keyless bushing that you can customize to your needs.

Application Examples - Spur Gears

Application example: workpiece transport - spur gear - rack gear - roller bearings - workpiece

Application example - spur gear with rack gear
(1) Spur gear, (2) Clamping knobs, (3) Rack gear

Application example: rack gear - spur gear with rack gear - handle - rotary handle

Application example - spur gear
(1) Spur gear, (2) Workpiece, (3) Rollers

Industrial Applications

3D printer industry

Automotive industry

Pharmaceutical industry

Packaging industry

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Part Number
GEAHBB2.5-18-20-A-[8-26/1]
GEAHBB2.5-18-20-B-[8-26/1]
GEAHBB2.5-18-25-A-[8-26/1]
GEAHBB2.5-18-25-B-[8-26/1]
GEAHBB2.5-19-20-A-[8-27/1]
GEAHBB2.5-19-20-B-[8-27/1]
GEAHBB2.5-19-25-A-[8-27/1]
GEAHBB2.5-19-25-B-[8-27/1]
GEAHBB2.5-20-20-A-[8-28/1]
GEAHBB2.5-20-20-B-[8-28/1]
GEAHBB2.5-20-25-A-[8-28/1]
GEAHBB2.5-20-25-B-[8-28/1]
GEAHBB2.5-21-20-A-[8-30/1]
GEAHBB2.5-21-20-B-[8-30/1]
GEAHBB2.5-21-25-A-[8-29/1]
GEAHBB2.5-21-25-B-[8-29/1]
GEAHBB2.5-22-20-A-[8-32/1]
GEAHBB2.5-22-20-B-[8-32/1]
GEAHBB2.5-22-25-A-[8-30/1]
GEAHBB2.5-22-25-B-[8-30/1]
GEAHBB2.5-23-20-A-[8-34/1]
GEAHBB2.5-23-20-B-[8-34/1]
GEAHBB2.5-23-25-A-[8-32/1]
GEAHBB2.5-23-25-B-[8-32/1]
GEAHBB2.5-24-20-A-[8-36/1]
GEAHBB2.5-24-20-B-[8-36/1]
GEAHBB2.5-24-25-A-[8-33/1]
GEAHBB2.5-24-25-B-[8-33/1]
GEAHBB2.5-25-20-A-[8-38/1]
GEAHBB2.5-25-20-B-[8-38/1]
GEAHBB2.5-25-25-A-[8-35/1]
GEAHBB2.5-25-25-B-[8-35/1]
GEAHBB2.5-26-20-A-[8-43/1]
GEAHBB2.5-26-20-B-[8-43/1]
GEAHBB2.5-26-25-A-[8-38/1]
GEAHBB2.5-26-25-B-[8-38/1]
GEAHBB2.5-27-20-A-[8-48/1]
GEAHBB2.5-27-20-B-[8-48/1]
GEAHBB2.5-27-25-A-[8-42/1]
GEAHBB2.5-27-25-B-[8-42/1]
GEAHBB2.5-28-20-A-[8-48/1]
GEAHBB2.5-28-20-B-[8-48/1]
GEAHBB2.5-28-25-A-[8-42/1]
GEAHBB2.5-28-25-B-[8-42/1]
GEAHBB2.5-29-20-A-[8-49/1]
GEAHBB2.5-29-20-B-[8-49/1]
GEAHBB2.5-29-25-A-[8-43/1]
GEAHBB2.5-29-25-B-[8-43/1]
GEAHBB2.5-30-20-A-[8-51/1]
GEAHBB2.5-30-20-B-[8-51/1]
GEAHBB2.5-30-25-A-[8-45/1]
GEAHBB2.5-30-25-B-[8-45/1]
GEAHBB2.5-32-20-A-[8-55/1]
GEAHBB2.5-32-20-B-[8-55/1]
GEAHBB2.5-32-25-A-[8-49/1]
GEAHBB2.5-32-25-B-[8-49/1]
GEAHBB2.5-33-20-A-[8-55/1]
GEAHBB2.5-33-20-B-[8-55/1]
GEAHBB2.5-33-25-A-[8-55/1]
GEAHBB2.5-33-25-B-[8-55/1]

Standard Unit Price	Minimum order quantity	Standard Shipping Days ?	RoHS	Number of Teeth (Teeth)	Material (Details)	Shape	Surface Treatment	Shaft Bore Config.	Shaft Bore Dia. (Ø)	Tooth Width B (mm)	Precision (Old JIS)
-	1	7 Days	-	18	[General Steel Material] EN 1.1191 Equiv.	Shape A	Black Oxide	Round Hole	8 ～ 26	20	JIS B 1702 Class 4
-	1	7 Days	-	18	[General Steel Material] EN 1.1191 Equiv.	Shape B	Black Oxide	Round Hole	8 ～ 26	20	JIS B 1702 Class 4
-	1	10 Days	10	18	[General Steel Material] EN 1.1191 Equiv.	Shape A	Black Oxide	-	8 ～ 26	25	JIS B 1702 (Class 4)
-	1	10 Days	10	18	[General Steel Material] EN 1.1191 Equiv.	Shape B	Black Oxide	-	8 ～ 26	25	JIS B 1702 (Class 4)
-	1	7 Days	-	19	[General Steel Material] EN 1.1191 Equiv.	Shape A	Black Oxide	Round Hole	8 ～ 27	20	JIS B 1702 Class 4
-	1	7 Days	-	19	[General Steel Material] EN 1.1191 Equiv.	Shape B	Black Oxide	Round Hole	8 ～ 27	20	JIS B 1702 Class 4
-	1	10 Days	10	19	[General Steel Material] EN 1.1191 Equiv.	Shape A	Black Oxide	-	8 ～ 27	25	JIS B 1702 (Class 4)
-	1	10 Days	10	19	[General Steel Material] EN 1.1191 Equiv.	Shape B	Black Oxide	-	8 ～ 27	25	JIS B 1702 (Class 4)
-	1	7 Days	-	20	[General Steel Material] EN 1.1191 Equiv.	Shape A	Black Oxide	Round Hole	8 ～ 28	20	JIS B 1702 Class 4
-	1	7 Days	-	20	[General Steel Material] EN 1.1191 Equiv.	Shape B	Black Oxide	Round Hole	8 ～ 28	20	JIS B 1702 Class 4
-	1	10 Days	10	20	[General Steel Material] EN 1.1191 Equiv.	Shape A	Black Oxide	-	8 ～ 28	25	JIS B 1702 (Class 4)
-	1	10 Days	10	20	[General Steel Material] EN 1.1191 Equiv.	Shape B	Black Oxide	-	8 ～ 28	25	JIS B 1702 (Class 4)
-	1	7 Days	-	21	[General Steel Material] EN 1.1191 Equiv.	Shape A	Black Oxide	Round Hole	8 ～ 30	20	JIS B 1702 Class 4
-	1	7 Days	-	21	[General Steel Material] EN 1.1191 Equiv.	Shape B	Black Oxide	Round Hole	8 ～ 30	20	JIS B 1702 Class 4
-	1	10 Days	10	21	[General Steel Material] EN 1.1191 Equiv.	Shape A	Black Oxide	-	8 ～ 29	25	JIS B 1702 (Class 4)
-	1	10 Days	10	21	[General Steel Material] EN 1.1191 Equiv.	Shape B	Black Oxide	-	8 ～ 29	25	JIS B 1702 (Class 4)
-	1	7 Days	-	22	[General Steel Material] EN 1.1191 Equiv.	Shape A	Black Oxide	Round Hole	8 ～ 32	20	JIS B 1702 Class 4
-	1	7 Days	-	22	[General Steel Material] EN 1.1191 Equiv.	Shape B	Black Oxide	Round Hole	8 ～ 32	20	JIS B 1702 Class 4
-	1	10 Days	10	22	[General Steel Material] EN 1.1191 Equiv.	Shape A	Black Oxide	-	8 ～ 30	25	JIS B 1702 (Class 4)
-	1	10 Days	10	22	[General Steel Material] EN 1.1191 Equiv.	Shape B	Black Oxide	-	8 ～ 30	25	JIS B 1702 (Class 4)
-	1	7 Days	-	23	[General Steel Material] EN 1.1191 Equiv.	Shape A	Black Oxide	Round Hole	8 ～ 34	20	JIS B 1702 Class 4
-	1	7 Days	-	23	[General Steel Material] EN 1.1191 Equiv.	Shape B	Black Oxide	Round Hole	8 ～ 34	20	JIS B 1702 Class 4
-	1	10 Days	10	23	[General Steel Material] EN 1.1191 Equiv.	Shape A	Black Oxide	-	8 ～ 32	25	JIS B 1702 (Class 4)
-	1	10 Days	10	23	[General Steel Material] EN 1.1191 Equiv.	Shape B	Black Oxide	-	8 ～ 32	25	JIS B 1702 (Class 4)
-	1	7 Days	-	24	[General Steel Material] EN 1.1191 Equiv.	Shape A	Black Oxide	Round Hole	8 ～ 36	20	JIS B 1702 Class 4
-	1	7 Days	-	24	[General Steel Material] EN 1.1191 Equiv.	Shape B	Black Oxide	Round Hole	8 ～ 36	20	JIS B 1702 Class 4
-	1	10 Days	10	24	[General Steel Material] EN 1.1191 Equiv.	Shape A	Black Oxide	-	8 ～ 33	25	JIS B 1702 (Class 4)
-	1	10 Days	10	24	[General Steel Material] EN 1.1191 Equiv.	Shape B	Black Oxide	-	8 ～ 33	25	JIS B 1702 (Class 4)
-	1	7 Days	-	25	[General Steel Material] EN 1.1191 Equiv.	Shape A	Black Oxide	Round Hole	8 ～ 38	20	JIS B 1702 Class 4
-	1	7 Days	-	25	[General Steel Material] EN 1.1191 Equiv.	Shape B	Black Oxide	Round Hole	8 ～ 38	20	JIS B 1702 Class 4
-	1	10 Days	10	25	[General Steel Material] EN 1.1191 Equiv.	Shape A	Black Oxide	-	8 ～ 35	25	JIS B 1702 (Class 4)
-	1	10 Days	10	25	[General Steel Material] EN 1.1191 Equiv.	Shape B	Black Oxide	-	8 ～ 35	25	JIS B 1702 (Class 4)
-	1	7 Days	-	26	[General Steel Material] EN 1.1191 Equiv.	Shape A	Black Oxide	Round Hole	8 ～ 43	20	JIS B 1702 Class 4
-	1	7 Days	-	26	[General Steel Material] EN 1.1191 Equiv.	Shape B	Black Oxide	Round Hole	8 ～ 43	20	JIS B 1702 Class 4
-	1	10 Days	10	26	[General Steel Material] EN 1.1191 Equiv.	Shape A	Black Oxide	-	8 ～ 38	25	JIS B 1702 (Class 4)
-	1	10 Days	10	26	[General Steel Material] EN 1.1191 Equiv.	Shape B	Black Oxide	-	8 ～ 38	25	JIS B 1702 (Class 4)
-	1	7 Days	-	27	[General Steel Material] EN 1.1191 Equiv.	Shape A	Black Oxide	Round Hole	8 ～ 48	20	JIS B 1702 Class 4
-	1	7 Days	-	27	[General Steel Material] EN 1.1191 Equiv.	Shape B	Black Oxide	Round Hole	8 ～ 48	20	JIS B 1702 Class 4
-	1	10 Days	10	27	[General Steel Material] EN 1.1191 Equiv.	Shape A	Black Oxide	-	8 ～ 42	25	JIS B 1702 (Class 4)
-	1	10 Days	10	27	[General Steel Material] EN 1.1191 Equiv.	Shape B	Black Oxide	-	8 ～ 42	25	JIS B 1702 (Class 4)
-	1	7 Days	-	28	[General Steel Material] EN 1.1191 Equiv.	Shape A	Black Oxide	Round Hole	8 ～ 48	20	JIS B 1702 Class 4
-	1	7 Days	-	28	[General Steel Material] EN 1.1191 Equiv.	Shape B	Black Oxide	Round Hole	8 ～ 48	20	JIS B 1702 Class 4
-	1	10 Days	10	28	[General Steel Material] EN 1.1191 Equiv.	Shape A	Black Oxide	-	8 ～ 42	25	JIS B 1702 (Class 4)
-	1	10 Days	10	28	[General Steel Material] EN 1.1191 Equiv.	Shape B	Black Oxide	-	8 ～ 42	25	JIS B 1702 (Class 4)
-	1	7 Days	-	29	[General Steel Material] EN 1.1191 Equiv.	Shape A	Black Oxide	Round Hole	8 ～ 49	20	JIS B 1702 Class 4
-	1	7 Days	-	29	[General Steel Material] EN 1.1191 Equiv.	Shape B	Black Oxide	Round Hole	8 ～ 49	20	JIS B 1702 Class 4
-	1	10 Days	10	29	[General Steel Material] EN 1.1191 Equiv.	Shape A	Black Oxide	-	8 ～ 43	25	JIS B 1702 (Class 4)
-	1	10 Days	10	29	[General Steel Material] EN 1.1191 Equiv.	Shape B	Black Oxide	-	8 ～ 43	25	JIS B 1702 (Class 4)
-	1	7 Days	-	30	[General Steel Material] EN 1.1191 Equiv.	Shape A	Black Oxide	Round Hole	8 ～ 51	20	JIS B 1702 Class 4
-	1	7 Days	-	30	[General Steel Material] EN 1.1191 Equiv.	Shape B	Black Oxide	Round Hole	8 ～ 51	20	JIS B 1702 Class 4
-	1	10 Days	10	30	[General Steel Material] EN 1.1191 Equiv.	Shape A	Black Oxide	-	8 ～ 45	25	JIS B 1702 (Class 4)
-	1	10 Days	10	30	[General Steel Material] EN 1.1191 Equiv.	Shape B	Black Oxide	-	8 ～ 45	25	JIS B 1702 (Class 4)
-	1	7 Days	-	32	[General Steel Material] EN 1.1191 Equiv.	Shape A	Black Oxide	Round Hole	8 ～ 55	20	JIS B 1702 Class 4
-	1	7 Days	-	32	[General Steel Material] EN 1.1191 Equiv.	Shape B	Black Oxide	Round Hole	8 ～ 55	20	JIS B 1702 Class 4
-	1	10 Days	10	32	[General Steel Material] EN 1.1191 Equiv.	Shape A	Black Oxide	-	8 ～ 49	25	JIS B 1702 (Class 4)
-	1	10 Days	10	32	[General Steel Material] EN 1.1191 Equiv.	Shape B	Black Oxide	-	8 ～ 49	25	JIS B 1702 (Class 4)
-	1	7 Days	-	33	[General Steel Material] EN 1.1191 Equiv.	Shape A	Black Oxide	Round Hole	8 ～ 55	20	JIS B 1702 Class 4
-	1	7 Days	-	33	[General Steel Material] EN 1.1191 Equiv.	Shape B	Black Oxide	Round Hole	8 ～ 55	20	JIS B 1702 Class 4
-	1	7 Days	-	33	[General Steel Material] EN 1.1191 Equiv.	-	Black Oxide	-	8 ～ 55	25	JIS B 1702 (Class 4)
-	1	7 Days	-	33	[General Steel Material] EN 1.1191 Equiv.	-	Black Oxide	-	8 ～ 55	25	JIS B 1702 (Class 4)

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Basic information

RoHS Information	RoHS Requirements Fulfilled	Features, Areas of Application	Not Applicable	Ground Tooth	Not Provided
Backlash	Provided	Heat Treatment	No	Bushing	Without Bushing
Shaft Bore Tolerance	H7	Bearing	Without Bearing

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Basic Attributes

Number of Teeth(Teeth)
12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

32

33

34

35

36

38

39

40

42

44

45

46

48

49

50

51

52

54

55

56

57

58

60

62

63

64

65

66

68

69

70

72

75

76

77

78

80
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Material (Details)
- General Steel Material
  - EN 1.1191 Equiv.
- Stainless Steel
  - EN 1.4301 Equiv.
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Shape
- Shape A
- Shape B
Clear
Surface Treatment
- Not Provided
- Black Oxide
- Electroless Nickel Plating
Clear
Shaft Bore Config.
- Round Hole
- Round hole+tap
- Keyway
- Keyway + Tap
Clear
Shaft Bore Dia.(Ø)
8

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

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38

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40

41

42

43

44

45

46

47

48

49

50
[8-60/1Ø Unit(s)]
Clear
Tooth Width B(mm)
20

25
Clear
Type
- GEAB2.5
- GEABB2.5
- GEABG2.5
- GEAHB2.5
- GEAHBB2.5
- GEAHBG2.5
- GEAHS2.5
- GEAKB2.5
- GEAKBB2.5
- GEAKBG2.5
- GEAKS2.5
- GEAS2.5
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Optional Attributes

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

Frequently Asked Questions (FAQ)

Question:
Can different modules be combined with each other?: Answer:
Since the module describes the division of the teeth along the pitch circle diameter, various modules cannot be combined into one pair of gears.
Question:
What is involute gearing?: Answer:
Evolved gearing is understood to be the convex production of a tooth flank. The sliding friction along the tooth flank can thus be minimized. This also reduces wear and tear.
Question:
What is the pressure angle?: Answer:
The pressure angle is defined as the angle of the highest drive force between two gears. A combination of different pressure angles is not recommended, since increased wear is to be expected.
Question:
Is the position of the keyway to the key-type specified?: Answer:
The keyway has no specified position reference to the tooth base or the head surface of the sprocket.
Question:
What is the reverse clearance?: Answer:
The reverse play arises at the moment of the direction of rotation of a spur gear pairing is changed. It describes the gap between the gear flanks of each tooth in engagement.