Spur gears / tooth width / hub dimension configurable / contact angle 20 degrees (Part Numbers - CAD Download)

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Back to the Category Spur Gears

Technical Drawing - Spur Gears

Spur Gears/Tooth Width/Hub Dimension Configurable/Pressure Angle 20Deg.:Related Image

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Available dimensions and tolerances can be found under the tab More Information.

Basic Properties (e.g., material, hardness, coating, tolerance) - Spur Gears

Type			Material	Surface Treatment	Accessory
Straight Bore	Straight Bore + Tap	Keyway + Tap	Material	Surface Treatment	Accessory
GEFHB	GEFB	GEFKB	EN 1.1191 Equiv.	-	Set Screw (EN 1.7220 Equiv., Black Oxide)
GEFHBB	GEFBB	GEFKBB		Black Oxide
GEFHBG	GEFBG	GEFKBG		Electroless Nickel Plating
GEFHBS	GEFBS	GEFKBS	EN 1.4301 Equiv.	-	Set Screw (EN 1.4301 Equiv.)

Set Screw is not included in Straight Bore products.

Further specifications can be found under the tab More Information.

Composition of a Product Code - Spur Gears

Part Number	-	Number of Teeth	-	B	-	P	-	W	-	H
GEFHB1.0 GEFKBG2.0	- -	30 32	- -	8 15	- -	15 20N	- -	W10 W0	-	H26

Alterations - Spur Gears

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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Data to be displayed: 30; 45; 60

Part Number
GEFKB1.0-48-[5-15/1]-8N-W[0-15/1]
GEFKB1.0-48-[5-15/1]-9N-W[0-15/1]
GEFKB1.0-48-[5-15/1]-10K-W[0-15/1]
GEFKB1.0-48-[5-15/1]-10N-W[0-15/1]
GEFKB1.0-48-[5-15/1]-11N-W[0-15/1]
GEFKB1.0-48-[5-15/1]-12N-W[0-15/1]
GEFKB1.0-48-[5-15/1]-13N-W[0-15/1]
GEFKB1.0-48-[5-15/1]-14N-W[0-15/1]
GEFKB1.0-48-[5-15/1]-15N-W[0-15/1]
GEFKB1.0-48-[5-15/1]-16N-W[0-15/1]
GEFKB1.0-48-[5-15/1]-17N-W[0-15/1]
GEFKB1.0-48-[5-15/1]-18N-W[0-15/1]
GEFKB1.0-48-[5-15/1]-19N-W[0-15/1]
GEFKB1.0-48-[5-15/1]-20N-W[0-15/1]
GEFKB1.0-50-[5-15/1]-10K-W[0-15/1]
GEFKB1.0-50-[5-15/1]-10N-W[0-15/1]
GEFKB1.0-50-[5-15/1]-11N-W[0-15/1]
GEFKB1.0-50-[5-15/1]-12N-W[0-15/1]
GEFKB1.0-50-[5-15/1]-13N-W[0-15/1]
GEFKB1.0-50-[5-15/1]-14N-W[0-15/1]
GEFKB1.0-50-[5-15/1]-15N-W[0-15/1]
GEFKB1.0-50-[5-15/1]-16N-W[0-15/1]
GEFKB1.0-50-[5-15/1]-17N-W[0-15/1]
GEFKB1.0-50-[5-15/1]-18N-W[0-15/1]
GEFKB1.0-50-[5-15/1]-19N-W[0-15/1]
GEFKB1.0-50-[5-15/1]-20N-W[0-15/1]
GEFKB1.0-50-[5-15/1]-21N-W[0-15/1]
GEFKB1.0-50-[5-15/1]-22N-W[0-15/1]
GEFKB1.0-50-[5-15/1]-23N-W[0-15/1]
GEFKB1.0-50-[5-15/1]-24N-W[0-15/1]
GEFKB1.0-50-[5-15/1]-25N-W[0-15/1]
GEFKB1.0-50-[5-15/1]-26N-W[0-15/1]
GEFKB1.0-50-[5-15/1]-27N-W[0-15/1]
GEFKB1.0-50-[5-15/1]-28N-W[0-15/1]
GEFKB1.0-50-[5-15/1]-29N-W[0-15/1]
GEFKB1.0-50-[5-15/1]-30N-W[0-15/1]
GEFKB1.0-60-[5-15/1]-10K-W[0-15/1]
GEFKB1.0-60-[5-15/1]-10N-W[0-15/1]
GEFKB1.0-60-[5-15/1]-11N-W[0-15/1]
GEFKB1.0-60-[5-15/1]-12N-W[0-15/1]
GEFKB1.0-60-[5-15/1]-13N-W[0-15/1]
GEFKB1.0-60-[5-15/1]-14N-W[0-15/1]
GEFKB1.0-60-[5-15/1]-15N-W[0-15/1]
GEFKB1.0-60-[5-15/1]-16N-W[0-15/1]
GEFKB1.0-60-[5-15/1]-17N-W[0-15/1]
GEFKB1.0-60-[5-15/1]-18N-W[0-15/1]
GEFKB1.0-60-[5-15/1]-19N-W[0-15/1]
GEFKB1.0-60-[5-15/1]-20N-W[0-15/1]
GEFKB1.0-60-[5-15/1]-21N-W[0-15/1]
GEFKB1.0-60-[5-15/1]-22N-W[0-15/1]
GEFKB1.0-60-[5-15/1]-23N-W[0-15/1]
GEFKB1.0-60-[5-15/1]-24N-W[0-15/1]
GEFKB1.0-60-[5-15/1]-25N-W[0-15/1]
GEFKB1.0-60-[5-15/1]-26N-W[0-15/1]
GEFKB1.0-60-[5-15/1]-27N-W[0-15/1]
GEFKB1.0-60-[5-15/1]-28N-W[0-15/1]
GEFKB1.0-60-[5-15/1]-29N-W[0-15/1]
GEFKB1.0-60-[5-15/1]-30N-W[0-15/1]
GEFKB1.0-70-[5-15/1]-[12N,13N,14N,15N,16N,17N,18N,19N,20N,21N,22N,23N,24N,25N,26N,27N,28N,29N,30N,31N,32N,33N,34N,35N]-W[0-15/1]
GEFKB1.0-80-[5-15/1]-[12N,13N,14N,15N,16N,17N,18N,19N,20N,21N,22N,23N,24N,25N,26N,27N,28N,29N,30N,31N,32N,33N,34N,35N]-W[0-15/1]

Standard Unit Price	Minimum order quantity	Standard Shipping Days ?	RoHS	Number of Teeth (Teeth)	Material (Details)	Surface Treatment	Shaft Bore Dia. (Ø)	Tooth Width B (mm)	Hole Shape	Hub Width [W] (mm)
-	1	10 Days	10	48	General Steel Material	Not Provided	8	5 ～ 15	Keyway Hole + Tap	0 ～ 15
-	1	10 Days	10	48	General Steel Material	Not Provided	9	5 ～ 15	Keyway Hole + Tap	0 ～ 15
-	1	10 Days	10	48	General Steel Material	Not Provided	10	5 ～ 15	Keyway Hole + Tap	0 ～ 15
-	1	10 Days	10	48	General Steel Material	Not Provided	10	5 ～ 15	Keyway Hole + Tap	0 ～ 15
-	1	10 Days	10	48	General Steel Material	Not Provided	11	5 ～ 15	Keyway Hole + Tap	0 ～ 15
-	1	10 Days	10	48	General Steel Material	Not Provided	12	5 ～ 15	Keyway Hole + Tap	0 ～ 15
-	1	10 Days	10	48	General Steel Material	Not Provided	13	5 ～ 15	Keyway Hole + Tap	0 ～ 15
-	1	10 Days	10	48	General Steel Material	Not Provided	14	5 ～ 15	Keyway Hole + Tap	0 ～ 15
-	1	10 Days	10	48	General Steel Material	Not Provided	15	5 ～ 15	Keyway Hole + Tap	0 ～ 15
-	1	10 Days	10	48	General Steel Material	Not Provided	16	5 ～ 15	Keyway Hole + Tap	0 ～ 15
-	1	10 Days	10	48	General Steel Material	Not Provided	17	5 ～ 15	Keyway Hole + Tap	0 ～ 15
-	1	10 Days	10	48	General Steel Material	Not Provided	18	5 ～ 15	Keyway Hole + Tap	0 ～ 15
-	1	10 Days	10	48	General Steel Material	Not Provided	19	5 ～ 15	Keyway Hole + Tap	0 ～ 15
-	1	10 Days	10	48	General Steel Material	Not Provided	20	5 ～ 15	Keyway Hole + Tap	0 ～ 15
-	1	10 Days	10	50	General Steel Material	Not Provided	10	5 ～ 15	Keyway Hole + Tap	0 ～ 15
-	1	10 Days	10	50	General Steel Material	Not Provided	10	5 ～ 15	Keyway Hole + Tap	0 ～ 15
-	1	10 Days	10	50	General Steel Material	Not Provided	11	5 ～ 15	Keyway Hole + Tap	0 ～ 15
-	1	10 Days	10	50	General Steel Material	Not Provided	12	5 ～ 15	Keyway Hole + Tap	0 ～ 15
-	1	10 Days	10	50	General Steel Material	Not Provided	13	5 ～ 15	Keyway Hole + Tap	0 ～ 15
-	1	10 Days	10	50	General Steel Material	Not Provided	14	5 ～ 15	Keyway Hole + Tap	0 ～ 15
-	1	10 Days	10	50	General Steel Material	Not Provided	15	5 ～ 15	Keyway Hole + Tap	0 ～ 15
-	1	10 Days	10	50	General Steel Material	Not Provided	16	5 ～ 15	Keyway Hole + Tap	0 ～ 15
-	1	10 Days	10	50	General Steel Material	Not Provided	17	5 ～ 15	Keyway Hole + Tap	0 ～ 15
-	1	10 Days	10	50	General Steel Material	Not Provided	18	5 ～ 15	Keyway Hole + Tap	0 ～ 15
-	1	10 Days	10	50	General Steel Material	Not Provided	19	5 ～ 15	Keyway Hole + Tap	0 ～ 15
-	1	10 Days	10	50	General Steel Material	Not Provided	20	5 ～ 15	Keyway Hole + Tap	0 ～ 15
-	1	10 Days	10	50	General Steel Material	Not Provided	21	5 ～ 15	Keyway Hole + Tap	0 ～ 15
-	1	10 Days	10	50	General Steel Material	Not Provided	22	5 ～ 15	Keyway Hole + Tap	0 ～ 15
-	1	10 Days	10	50	General Steel Material	Not Provided	23	5 ～ 15	Keyway Hole + Tap	0 ～ 15
-	1	10 Days	10	50	General Steel Material	Not Provided	24	5 ～ 15	Keyway Hole + Tap	0 ～ 15
-	1	10 Days	10	50	General Steel Material	Not Provided	25	5 ～ 15	Keyway Hole + Tap	0 ～ 15
-	1	10 Days	10	50	General Steel Material	Not Provided	26	5 ～ 15	Keyway Hole + Tap	0 ～ 15
-	1	10 Days	10	50	General Steel Material	Not Provided	27	5 ～ 15	Keyway Hole + Tap	0 ～ 15
-	1	10 Days	10	50	General Steel Material	Not Provided	28	5 ～ 15	Keyway Hole + Tap	0 ～ 15
-	1	10 Days	10	50	General Steel Material	Not Provided	29	5 ～ 15	Keyway Hole + Tap	0 ～ 15
-	1	10 Days	10	50	General Steel Material	Not Provided	30	5 ～ 15	Keyway Hole + Tap	0 ～ 15
-	1	10 Days	10	60	General Steel Material	Not Provided	10	5 ～ 15	Keyway Hole + Tap	0 ～ 15
-	1	10 Days	10	60	General Steel Material	Not Provided	10	5 ～ 15	Keyway Hole + Tap	0 ～ 15
-	1	10 Days	10	60	General Steel Material	Not Provided	11	5 ～ 15	Keyway Hole + Tap	0 ～ 15
-	1	10 Days	10	60	General Steel Material	Not Provided	12	5 ～ 15	Keyway Hole + Tap	0 ～ 15
-	1	10 Days	10	60	General Steel Material	Not Provided	13	5 ～ 15	Keyway Hole + Tap	0 ～ 15
-	1	10 Days	10	60	General Steel Material	Not Provided	14	5 ～ 15	Keyway Hole + Tap	0 ～ 15
-	1	10 Days	10	60	General Steel Material	Not Provided	15	5 ～ 15	Keyway Hole + Tap	0 ～ 15
-	1	10 Days	10	60	General Steel Material	Not Provided	16	5 ～ 15	Keyway Hole + Tap	0 ～ 15
-	1	10 Days	10	60	General Steel Material	Not Provided	17	5 ～ 15	Keyway Hole + Tap	0 ～ 15
-	1	10 Days	10	60	General Steel Material	Not Provided	18	5 ～ 15	Keyway Hole + Tap	0 ～ 15
-	1	10 Days	10	60	General Steel Material	Not Provided	19	5 ～ 15	Keyway Hole + Tap	0 ～ 15
-	1	10 Days	10	60	General Steel Material	Not Provided	20	5 ～ 15	Keyway Hole + Tap	0 ～ 15
-	1	10 Days	10	60	General Steel Material	Not Provided	21	5 ～ 15	Keyway Hole + Tap	0 ～ 15
-	1	10 Days	10	60	General Steel Material	Not Provided	22	5 ～ 15	Keyway Hole + Tap	0 ～ 15
-	1	10 Days	10	60	General Steel Material	Not Provided	23	5 ～ 15	Keyway Hole + Tap	0 ～ 15
-	1	10 Days	10	60	General Steel Material	Not Provided	24	5 ～ 15	Keyway Hole + Tap	0 ～ 15
-	1	10 Days	10	60	General Steel Material	Not Provided	25	5 ～ 15	Keyway Hole + Tap	0 ～ 15
-	1	10 Days	10	60	General Steel Material	Not Provided	26	5 ～ 15	Keyway Hole + Tap	0 ～ 15
-	1	10 Days	10	60	General Steel Material	Not Provided	27	5 ～ 15	Keyway Hole + Tap	0 ～ 15
-	1	10 Days	10	60	General Steel Material	Not Provided	28	5 ～ 15	Keyway Hole + Tap	0 ～ 15
-	1	10 Days	10	60	General Steel Material	Not Provided	29	5 ～ 15	Keyway Hole + Tap	0 ～ 15
-	1	10 Days	10	60	General Steel Material	Not Provided	30	5 ～ 15	Keyway Hole + Tap	0 ～ 15
-	1	10 Days	10	70	General Steel Material	Not Provided	12 ～ 35	5 ～ 15	Keyway Hole + Tap	0 ～ 15
-	1	10 Days	10	80	General Steel Material	Not Provided	12 ～ 35	5 ～ 15	Keyway Hole + Tap	0 ～ 15

Back to the Category Spur Gears

Technical Drawing - Spur Gears

Open the technical drawing in the new window

Specification Tables - Spur Gears

■Module 0.5, 0.8, 1.0, 1.5

Part Number		Number of Teeth	B 1mm Increment	Shaft Bore Dia. P_H7 (1mm Increment)		Hub 1mm Increment		d Reference Dia.	D Tip Dia.	G Root Dia.	Unit Price
Type	Module			Straight Bore Straight Bore + Tap	Keyway + Tap	W	H				Straight Bore				Straight Bore + Tap				Keyway + Tap
Type	Module			Straight Bore Straight Bore + Tap	Keyway + Tap	W	H				GEFHB	GEFHBB	GEFHBG	GEFHBS	GEFB	GEFBB	GEFBG	GEFBS	GEFKB	GEFKBB	GEFKBG	GEFKBS
Straight Bore GEFHB GEFHBB GEFHBG GEFHBS Straight Bore + Tap GEFB GEFBB GEFBG GEFBS Keyway + Tap GEFKB GEFKBB GEFKBG GEFKBS	0.5	20	2~5	3 4	-	0~10	P+2≤H≤G-2 (Straight Bore) P+4≤H≤G-2 (Straight Bore + Tap)	10	11	8.75									-	-	-	-
		24		3~6				12	13	10.75									-	-	-	-
		25						12.5	13.5	11.25									-	-	-	-
		26						13	14	11.75									-	-	-	-
		30						15	16	13.75									-	-	-	-
		32						16	17	14.75									-	-	-	-
		36		3~12				18	19	16.75									-	-	-	-
		40						20	21	18.75									-	-	-	-
		48						24	25	22.75									-	-	-	-
		50						25	26	23.75									-	-	-	-
		60		5~25				30	31	28.75				-				-	-	-	-	-
		70						35	36	33.75				-				-	-	-	-	-
		80						40	41	38.75				-				-	-	-	-	-
		100						50	51	48.75				-				-	-	-	-	-
	0.8	15	3~10	5 6 6.35	-	0~10	P+2≤H≤G-2 (Straight Bore) P+4≤H≤G-2 (Straight Bore + Tap)	12	13.6	10									-	-	-	-
		16						12.8	14.4	10.8									-	-	-	-
		18						14.4	16	12.4									-	-	-	-
		20						16	17.6	14									-	-	-	-
		24		5~8				19.2	20.8	17.2									-	-	-	-
		25						20	21.6	18									-	-	-	-
		28						22.4	24	20.4									-	-	-	-
		30						24	25.6	22									-	-	-	-
		32						25.6	27.2	23.6									-	-	-	-
		36		6~8 6.35				28.8	30.4	26.8									-	-	-	-
		40						32	33.6	30									-	-	-	-
		45						36	37.6	34									-	-	-	-
		48						38.4	40	36.4									-	-	-	-
		50						40	41.6	38									-	-	-	-
	1.0	20	5~15	6~12	8N	0~15	P+4≤H≤G-3 (Straight Bore, Straight Bore + Tap) P+6≤H≤G-3 (Keyway + Tap)	20	22	17.5
		21			8N~10N			21	23	18.5
		22						22	24	19.5
		23						23	25	20.5
		24						24	26	21.5
		25						25	27	22.5
		26		6~18	8N~12N			26	28	23.5
		28						28	30	25.5
		30					P+10≤H≤G-3 (Straight Bore, Straight Bore + Tap) P+13≤H≤G-3 (Keyway + Tap)	30	32	27.5
		32						32	34	29.5
		35		8~20				35	37	32.5
		36			8N~20N			36	38	33.5
		40						40	42	37.5
		48		8~35				48	50	45.5
		50			10N~30N			50	52	47.5
		60			10N~30N			60	62	57.5
		70		10~40	12N~35N			70	72	67.5
		80		10~40	12N~35N			80	82	77.5
		100		15~40	15N~35N			100	102	97.5
		120		15~40	15N~35N			120	122	117.5
	1.5	16	10~20	6~12	8N~12N	0~20	P+6≤H≤G-4	24	27	20.25
		18						27	30	23.25
		20						30	33	26.25
		24		6~18	8N~15N			36	39	32.25
		25					P+13≤H≤G-4 (Straight Bore, Straight Bore + Tap) P+15≤H≤G-4 (Keyway + Tap)	37.5	40.5	33.75
		26						39	42	35.25
		28						42	45	38.25
		30		6~25	8N~25N			45	48	41.25
		35						52.5	55.5	48.75
		36						54	57	50.25
		40		8~40	8N~30N			60	63	56.25
		48						72	75	68.25
		50						75	78	71.25
		60		12~40	12N~35N		P+15≤H≤G-4 (Straight Bore, Straight Bore + Tap) P+20≤H≤G-4 (Keyway + Tap)	90	93	86.25
		70						105	108	101.25
		80						120	123	116.25				-				-				-

■Module 2.0, 2.5, 3.0

Part Number		Number of Teeth	B 1mm Increment	Shaft Bore Dia. P_H7 (1mm Increment)		Hub 1mm Increment		d Reference Dia.	D Tip Dia.	G Root Dia.	Unit Price
Type	Module			Straight Bore Straight Bore + Tap	Keyway + Tap	W	H				Straight Bore				Straight Bore + Tap				Keyway + Tap
Type	Module			Straight Bore Straight Bore + Tap	Keyway + Tap	W	H				GEFHB	GEFHBB	GEFHBG	GEFHBS	GEFB	GEFBB	GEFBG	GEFBS	GEFKB	GEFKBB	GEFKBG	GEFKBS
Straight Bore GEFHB GEFHBB GEFHBG GEFHBS Straight Bore + Tap GEFB GEFBB GEFBG GEFBS Keyway + Tap GEFKB GEFKBB GEFKBG GEFKBS	2.0	15	15~25	8~15	8N~12N	0~25	P+10≤H≤G-5 (Straight Bore, Straight Bore + Tap) P+12≤H≤G-5 (Keyway + Tap)	30	34	25
		16						32	36	27
		18						36	40	31
		20						40	44	35
		24		8~20	8N~17N			48	52	43
		25						50	54	45
		26						52	56	47
		30		8~25	8N~20N			60	64	55
		32		8~25	8N~20N			64	68	59
		36		10~30	10N~25N		P+12≤H≤G-5 (Straight Bore, Straight Bore + Tap) P+14≤H≤G-5 (Keyway + Tap)	72	76	67
		40		10~30	10N~25N			80	84	75
		48		10~35	10N~30N			96	100	91
		50		10~35	10N~30N			100	104	95
		52		12~40	12N~35N			104	108	99
		60		12~40	12N~35N			120	124	115
	2.5	18	20~30	8~15	8N~12N	0~30	P+10≤H≤G-6 (Straight Bore, Straight Bore + Tap) P+12≤H≤G-6 (Keyway + Tap)	45	50	38.75
		20		8~15	8N~12N			50	55	43.75
		25		8~20	8N~17N			62.5	67.5	56.25
		28		8~25	8N~20N			70	75	63.75
		36		8~30	8N~25N		P+12≤H≤G-6 (Straight Bore, Straight Bore + Tap) P+14≤H≤G-6 (Keyway + Tap)	90	95	83.75
		40		8~30	8N~25N			100	105	93.75
		50		12~40	12N~35N			125	130	118.75
	3.0	12	25~35	8~15	8N~12N	0~35	P+10≤H≤G-7 (Straight Bore, Straight Bore + Tap) P+12≤H≤G-7 (Keyway + Tap)	36	42	28.5
		15		8~15	8N~12N			45	51	37.5
		18		8~20	8N~20N			54	60	46.5
		20		8~25	8N~25N			60	66	52.5
		30		10~30	10N~30N		P+12≤H≤G-7 (Straight Bore, Straight Bore + Tap) P+14≤H≤G-7 (Keyway + Tap)	90	96	82.5
		36		12~40	12N~35N			108	114	100.5
		40		12~40	12N~35N			120	126	112.5

Shaft bore diameter 9N is not available for Keyway Bore + Tap. When specifying "Straight Bore + Tap" and "Keyway + Tap," make sure that the hub length satisfies the condition of "(W)>M+3".
When the tooth width is smaller, the transmitting torque is smaller. Shaft bore diameter 6.35 is available for Straight Bore and Straight Bore + Tap.
Specify 10K as the P dimension if keyway width of 4.0mm (height 1.8mm) for Keyway + Tap with shaft bore diameter of 10 is desired >> P.1498
When requesting Shape A (no hub), specify W=0.
When W=0, specification for H is not required.
For WDH alterations, the H range requirements considered as Q and R = P must satisfy the condition of "Q＋○ ≤ H ≤ G - ○, R+ ○ ≤ H ≤ G - ○." (○: Refer to the value in the specification table)
For DHL/DHR alterations, the H range requirements considered as Z = P must satisfy the condition of "Z + ○ ≤ H ≤ G - ○." (○: Refer to the value in the specification table)

Alterations - Spur Gears

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Basic information

Shape	Shape A / Shape B	Ground Tooth	Not Provided	Backlash	Provided
Precision(Old JIS)	JIS B 1702 (Class 4)

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Basic Attributes

Number of Teeth(Teeth)
12

15

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Material (Details)
- General Steel Material
- Stainless Steel
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Shaft Bore Dia.(Ø)
5

6

6.35

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8

9

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11

12

13

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35
[3-40/1Ø Unit(s)]
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Tooth Width B(mm)
[2-35/1mm Unit(s)]
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Hole Shape
- Keyway Hole + Tap
- Round Hole
- Round Hole + Tap
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Hub Width [W](mm)
[0-35/1mm Unit(s)]
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Type
- GEFB
- GEFBB
- GEFBG
- GEFBS
- GEFHB
- GEFHBB
- GEFHBG
- GEFHBS
- GEFKB
- GEFKBB
- GEFKBG
- GEFKBS
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Surface Treatment
- Not Provided
- Black Oxide
- Electroless Nickel Plating
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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.