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Discontinued Products

Helical Gears - Module 2.5, Shaft Bore Configurable Type

Helical Gears - Module 2.5, Shaft Bore Configurable Type

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MISUMI

MISUMI

Features: Helical gears have a higher contact ratio than spur gears, resulting in superior transmission accuracy and quieter operation.
Right-twisted helical gears engage with left-twisted helical gears.
Four types of shaft bore are selectable: straight bore, straight bore + tap, keyway, and keyway + tap.
Available alterations: Set screw alteration, tapped hole dimension change, stepped hole, both ends stepped hole, hub cut, hub diameter cut, side slotted hole, side through hole, side tapped hole, and side counterbored hole alterations are possible.
Lineup by moduleModule 1.0Module 1.5Module 2.0Module 3.0

(i)Remark

  • When downloading CAD data, the tooth shape will not be generated on the 3D drawing. Please refer to the reference circle on the 3D drawing.

Part Number

Once your search is narrowed to one product,
the corresponding part number is displayed here.

Gear Shape
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)
[ ! ] Refer to the dimensions table for keyway dimension details.
[!] Relative positioning of keyway and teeth is not fixed.
Gear dimensions
Datum Section of GearsTeeth perpendicular
Module2.5
Pressure Angle20°
Helix Angle19° 31′42″
Gear AccuracyJIS B 1702-1, ISO 1328-1, Flank Tolerance Class 8
Type[M] Material[S] Surface Treatment[A]Accessory
Straight BoreStraight Bore + TapKeyway, Keyway + Tap
HGEARHBHGEARBHGEARKBEN 1.1191 Equiv.—Set Screw
(EN 1.7220 Equiv. Black Oxide)
HGEARHBBHGEARBBHGEARKBBBlack Oxide
HGEARHBGHGEARBGHGEARKBGElectroless Nickel Plating
[!] Set Screw is not included when an untapped specification is selected.

Specification Table

Part Number—Number of Teeth—B—Gear Shape—P—Twisting Direction
HGEARHB2.5—25—25—A—10—LH
HGEARBG2.5—38—25—B—20—RH
HGEARKB2.5—18—25—A—12—LH
Part NumberNumber of TeethB
Tooth Width		Gear
Shape		Shaft Bore Dia. PH7Twisting
Direction		d
Reference Circle
Dia.		D
Addendum Circle
Dia.		G
Dedendum Circle
Dia.		HLℓ1ℓ2M
(Coarse)		*1 Allowable Torque (N⋅m)
TypeModuleStraight Bore
Straight Bore + Tap		Keyway
Keyway + Tap		Bending StrengthTooth Surface Strength
Straight Bore
(Shape A, Shape B)
HGEARHB
HGEARHBB
HGEARHBG


Straight Bore + Tap
(Shape B)
HGEARB
HGEARBB
HGEARBG


Keyway
(Shape A)
Keyway + Tap
(Shape B)
HGEARKB
HGEARKBB
HGEARKBG		2.51525A

B		8 to 208 to 15LH (Left)

RH (Right)		39.7944.7933.542941168M456.204.02
168 to 228 to 1742.4447.4436.193262.064.68
178 to 248 to 1945.0950.0938.843468.065.40
188 to 268 to 2247.7552.7541.503774.156.18
198 to 2750.4055.4044.154080.337.02
208 to 288 to 2353.0558.0546.804286.597.92
218 to 308 to 2755.7060.7049.454592.938.88
228 to 328 to 2958.3663.3652.114899.339.91
238 to 348 to 3061.0166.0154.7650105.7911.00
248 to 368 to 3263.6668.6657.4153112.3012.16
258 to 388 to 3366.3171.3160.0656118.8613.39
268 to 438 to 3768.9773.9762.7258125.4714.68
278 to 488 to 4071.6276.6265.3761132.1316.05
2874.2779.2768.0264138.8217.48
298 to 498 to 4176.9381.9370.6866145.5518.99
308 to 518 to 4379.5884.5873.3369152.3120.56
328 to 558 to 4784.8889.8878.6374165.9323.94
3387.5492.5481.2977215.9725.73
3410 to 5510 to 4790.1995.1983.9480M5224.5727.60
3592.8497.8486.59233.1929.55
3610 to 5710 to 4995.49100.4989.24241.8531.58
38100.80105.8094.55259.2335.86
39103.45108.4597.20267.9638.12
4010 to 6010 to 50106.10111.1099.85276.7140.45
42111.41116.41105.16294.2845.37
44116.71121.71110.46311.9150.60
45119.37124.37113.12320.7653.35
46122.02127.02115.77329.6256.17
48127.32132.32121.07347.3862.07
49129.98134.98123.73356.2965.14
5012 to 6012 to 50132.63137.63126.38M6365.2068.31
5115 to 50135.28140.28129.03374.1371.55
5215 to 60137.93142.93131.68383.0774.88
54143.24148.24136.99400.9981.80
55145.89150.89139.64409.9685.39
56148.54153.54142.29418.9489.07
57151.20156.20144.95427.9392.84
58153.85158.85147.60436.9396.69
6025 to 6025 to 50159.16164.16152.91454.96104.67
62164.46169.46158.21473.02113.01
63167.11172.11160.86482.06117.31
64169.77174.77163.52491.11121.71
65172.42177.42166.17500.17126.19
66175.07180.07168.82509.23130.77
68180.38185.38174.13527.37140.20
69183.03188.03176.78536.45145.05
70185.68190.68179.43545.53150.00
72190.99195.99184.74563.72160.17
75198.94203.94192.69591.04176.13
76201.60206.60195.35600.15181.64
77204.25209.25198.00609.27187.25
78206.90211.90200.65618.40192.95
80212.21217.21205.96636.66204.64
[ ! ] Shaft Bore Dia. 9 is not available for Keyway + Tap.
[!] The tooth trace is twisted, generating thrust. Design the bearing to be able to withstand axial thrust.
[!] Helical gears engage with the same helix angle with right and left twisting. Please bear this in mind when selecting as part of a set.
*1 Allowable Transmission Forces in the table are reference values calculated with prescribed conditions.

Alterations

AlterationsSide Through HoleSide Tapped HoleSide Counterbored
CodeKSC·KFC·KTCQSC·QFC·QTCZFC·ZTC
Spec.
Machines through holes on the side surface.
Dimension IncrementsKFC·KTC: 1 mm Increments
 K: 0.5 mm Increments
K selection K3.0 to K6.0
Ordering Code KFC20-K3.5
Applicable Conditions
Shape A
[ ! ]P+K+4 ≤ KSC (KFC/KTC) ≤ G−K−4


Shape B
Standard conditions

[ ! ]P+K+4 ≤ KSC (KFC/KTC) ≤ H−K−4

 

[ ! ]H+K+4 ≤ KSC (KFC/KTC) ≤ G−K−4

 

·Number of Holes

·Hole Position



[!] Conditions may vary depending on the shaft bore specs.
Machines tapped holes on the side surface of the gear
Dimension IncrementsQFC,QTC: 1 mm Increments
Select M M3, M4, M5, M6[ ! ] Tapped Hole Depth M × 2.0
 (When B < M × 2.0, through)
Applicable Conditions
Shape A
Ordering CodeQFC25−M3
Standard conditions

[ ! ]P+M+4 ≤ QSC (QFC/QTC) ≤ G−M−4

Shape B

Ordering CodeR-side specification: QFC25－M3－RR,
L-side specification: QFC25－M3－LL
Standard conditions

[ ! ]P+M+4 ≤ QSC (QFC/QTC) ≤ H−M−4

 

[ ! ]H+M+4 ≤ QSC (QFC/QTC) ≤ G−M−4

·Number of Holes

·Hole Position


[!] Conditions may vary depending on the shaft bore specs.
Machines counterbored holes on the side surface.
Dimension IncrementsZFC,ZTC: 1 mm Increments
Select U U3, U4, U5, U6

Applicable Conditions
Shape A
Ordering Code ZFC20-U3
Standard conditions

[ ! ]P+Ux2+3 ≤ ZFC (ZTC) ≤ G−Ux2−4

U SelectionU₁U₂F
36.53.53.5
484.54.5
59.55.55.5
6116.56.5
Shape B
Ordering CodeR-side specification: ZFC20−U3−RR,
L-side specification: ZFC20−U3−LL
Standard conditions

[ ! ]P+Ux2+3 ≤ ZFC (ZTC) ≤ H−Ux2−4

 

[ ! ]H+Ux2+4 ≤ ZFC (ZTC) ≤ G−Ux2−4

·Number of Holes

·Hole Position

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

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Part Number
HGEARB2.5-15-25-B-[8-20/1]-RH
HGEARB2.5-16-25-B-[8-22/1]-RH
HGEARB2.5-17-25-B-[8-24/1]-RH
HGEARB2.5-18-25-B-[8-26/1]-RH
HGEARB2.5-19-25-B-[8-27/1]-RH
HGEARB2.5-20-25-B-[8-28/1]-RH
HGEARB2.5-21-25-B-[8-30/1]-RH
HGEARB2.5-22-25-B-[8-32/1]-RH
HGEARB2.5-23-25-B-[8-34/1]-RH
HGEARB2.5-24-25-B-[8-36/1]-RH
HGEARB2.5-25-25-B-[8-38/1]-RH
HGEARB2.5-26-25-B-[8-43/1]-RH
HGEARB2.5-27-25-B-[8-48/1]-RH
HGEARB2.5-28-25-B-[8-48/1]-RH
HGEARB2.5-29-25-B-[8-49/1]-RH
HGEARB2.5-30-25-B-[8-51/1]-RH
HGEARB2.5-32-25-B-[8-55/1]-RH
HGEARB2.5-33-25-B-[8-55/1]-RH
HGEARB2.5-34-25-B-[10-55/1]-RH
HGEARB2.5-35-25-B-[10-55/1]-RH
HGEARB2.5-36-25-B-[10-57/1]-RH
HGEARB2.5-38-25-B-[10-57/1]-RH
HGEARB2.5-39-25-B-[10-57/1]-RH
HGEARB2.5-40-25-B-[10-60/1]-RH
HGEARB2.5-42-25-B-[10-60/1]-RH
HGEARB2.5-44-25-B-[10-60/1]-RH
HGEARB2.5-45-25-B-[10-60/1]-RH
HGEARB2.5-46-25-B-[10-60/1]-RH
HGEARB2.5-48-25-B-[10-60/1]-RH
HGEARB2.5-49-25-B-[10-60/1]-RH
HGEARB2.5-50-25-B-[12-60/1]-RH
HGEARB2.5-51-25-B-[12-60/1]-RH
HGEARB2.5-52-25-B-[15-60/1]-RH
HGEARB2.5-54-25-B-[15-60/1]-RH
HGEARB2.5-55-25-B-[15-60/1]-RH
HGEARB2.5-56-25-B-[15-60/1]-RH
HGEARB2.5-57-25-B-[15-60/1]-RH
HGEARB2.5-58-25-B-[15-60/1]-RH
HGEARB2.5-60-25-B-[25-60/1]-RH
HGEARB2.5-62-25-B-[25-60/1]-RH
HGEARB2.5-63-25-B-[25-60/1]-RH
HGEARB2.5-64-25-B-[25-60/1]-RH
HGEARB2.5-65-25-B-[25-60/1]-RH
HGEARB2.5-66-25-B-[25-60/1]-RH
HGEARB2.5-68-25-B-[25-60/1]-RH
HGEARB2.5-69-25-B-[25-60/1]-RH
HGEARB2.5-70-25-B-[25-60/1]-RH
HGEARB2.5-72-25-B-[25-60/1]-RH
HGEARB2.5-75-25-B-[25-60/1]-RH
HGEARB2.5-76-25-B-[25-60/1]-RH
HGEARB2.5-77-25-B-[25-60/1]-RH
HGEARB2.5-78-25-B-[25-60/1]-RH
HGEARB2.5-80-25-B-[25-60/1]-RH
HGEARBB2.5-15-25-B-[8-20/1]-RH
HGEARBB2.5-16-25-B-[8-22/1]-RH
HGEARBB2.5-17-25-B-[8-24/1]-RH
HGEARBB2.5-18-25-B-[8-26/1]-RH
HGEARBB2.5-19-25-B-[8-27/1]-RH
HGEARBB2.5-20-25-B-[8-28/1]-RH
HGEARBB2.5-21-25-B-[8-30/1]-RH
Part Number
Standard Unit Price
Minimum order quantityVolume Discount
Standard
Shipping Days
?
Number of Teeth
(Teeth) 		Twisting Direction Surface Treatment Shaft Bore Config. Shaft Bore Dia., Shaft Dia. Gear Shape

-

1 7 Days 15RightNot ProvidedRound hole+tap8 ～ 20Shape B

-

1 7 Days 16RightNot ProvidedRound hole+tap8 ～ 22Shape B

-

1 7 Days 17RightNot ProvidedRound hole+tap8 ～ 24Shape B

-

1 7 Days 18RightNot ProvidedRound hole+tap8 ～ 26Shape B

-

1 7 Days 19RightNot ProvidedRound hole+tap8 ～ 27Shape B

-

1 7 Days 20RightNot ProvidedRound hole+tap8 ～ 28Shape B

-

1 7 Days 21RightNot ProvidedRound hole+tap8 ～ 30Shape B

-

1 7 Days 22RightNot ProvidedRound hole+tap8 ～ 32Shape B

-

1 7 Days 23RightNot ProvidedRound hole+tap8 ～ 34Shape B

-

1 7 Days 24RightNot ProvidedRound hole+tap8 ～ 36Shape B

-

1 7 Days 25RightNot ProvidedRound hole+tap8 ～ 38Shape B

-

1 7 Days 26RightNot ProvidedRound hole+tap8 ～ 43Shape B

-

1 7 Days 27RightNot ProvidedRound hole+tap8 ～ 48Shape B

-

1 7 Days 28RightNot ProvidedRound hole+tap8 ～ 48Shape B

-

1 7 Days 29RightNot ProvidedRound hole+tap8 ～ 49Shape B

-

1 7 Days 30RightNot ProvidedRound hole+tap8 ～ 51Shape B

-

1 7 Days 32RightNot ProvidedRound hole+tap8 ～ 55Shape B

-

1 7 Days 33RightNot ProvidedRound hole+tap8 ～ 55Shape B

-

1 7 Days 34RightNot ProvidedRound hole+tap10 ～ 55Shape B

-

1 7 Days 35RightNot ProvidedRound hole+tap10 ～ 55Shape B

-

1 7 Days 36RightNot ProvidedRound hole+tap10 ～ 57Shape B

-

1 7 Days 38RightNot ProvidedRound hole+tap10 ～ 57Shape B

-

1 7 Days 39RightNot ProvidedRound hole+tap10 ～ 57Shape B

-

1 7 Days 40RightNot ProvidedRound hole+tap10 ～ 60Shape B

-

1 7 Days 42RightNot ProvidedRound hole+tap10 ～ 60Shape B

-

1 7 Days 44RightNot ProvidedRound hole+tap10 ～ 60Shape B

-

1 7 Days 45RightNot ProvidedRound hole+tap10 ～ 60Shape B

-

1 7 Days 46RightNot ProvidedRound hole+tap10 ～ 60Shape B

-

1 7 Days 48RightNot ProvidedRound hole+tap10 ～ 60Shape B

-

1 7 Days 49RightNot ProvidedRound hole+tap10 ～ 60Shape B

-

1 7 Days 50RightNot ProvidedRound hole+tap12 ～ 60Shape B

-

1 7 Days 51RightNot ProvidedRound hole+tap12 ～ 60Shape B

-

1 7 Days 52RightNot ProvidedRound hole+tap15 ～ 60Shape B

-

1 7 Days 54RightNot ProvidedRound hole+tap15 ～ 60Shape B

-

1 7 Days 55RightNot ProvidedRound hole+tap15 ～ 60Shape B

-

1 7 Days 56RightNot ProvidedRound hole+tap15 ～ 60Shape B

-

1 7 Days 57RightNot ProvidedRound hole+tap15 ～ 60Shape B

-

1 7 Days 58RightNot ProvidedRound hole+tap15 ～ 60Shape B

-

1 7 Days 60RightNot ProvidedRound hole+tap25 ～ 60Shape B

-

1 7 Days 62RightNot ProvidedRound hole+tap25 ～ 60Shape B

-

1 7 Days 63RightNot ProvidedRound hole+tap25 ～ 60Shape B

-

1 7 Days 64RightNot ProvidedRound hole+tap25 ～ 60Shape B

-

1 7 Days 65RightNot ProvidedRound hole+tap25 ～ 60Shape B

-

1 7 Days 66RightNot ProvidedRound hole+tap25 ～ 60Shape B

-

1 7 Days 68RightNot ProvidedRound hole+tap25 ～ 60Shape B

-

1 7 Days 69RightNot ProvidedRound hole+tap25 ～ 60Shape B

-

1 7 Days 70RightNot ProvidedRound hole+tap25 ～ 60Shape B

-

1 7 Days 72RightNot ProvidedRound hole+tap25 ～ 60Shape B

-

1 7 Days 75RightNot ProvidedRound hole+tap25 ～ 60Shape B

-

1 7 Days 76RightNot ProvidedRound hole+tap25 ～ 60Shape B

-

1 7 Days 77RightNot ProvidedRound hole+tap25 ～ 60Shape B

-

1 7 Days 78RightNot ProvidedRound hole+tap25 ～ 60Shape B

-

1 7 Days 80RightNot ProvidedRound hole+tap25 ～ 60Shape B

-

1 7 Days 15RightBlack OxideRound hole+tap8 ～ 20Shape B

-

1 7 Days 16RightBlack OxideRound hole+tap8 ～ 22Shape B

-

1 7 Days 17RightBlack OxideRound hole+tap8 ～ 24Shape B

-

1 7 Days 18RightBlack OxideRound hole+tap8 ～ 26Shape B

-

1 7 Days 19RightBlack OxideRound hole+tap8 ～ 27Shape B

-

1 7 Days 20RightBlack OxideRound hole+tap8 ～ 28Shape B

-

1 7 Days 21RightBlack OxideRound hole+tap8 ～ 30Shape B

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·When selecting Keyway types,
see the table on the right.
■New JIS (B1301) Keyway Dimensions
Nominaldh7bJS9t Tolerance
88+0.015
0    		3±0.01251.4+0.1
  0
1010
1111+0.018
0    		4±0.01501.8
1212
131352.3
1414
1515
1616
1717
181862.8
1919+0.021
0    
2020
2121
2222
Nominaldh7bJS9t Tolerance
2323+0.021
0    		8±0.01803.3+0.2
  0
2424
2525
2626
2727
2828
2929
3030
3131+0.025
0    		10
3232
3333
3434
3535
3636
3737
3838
 
Nominaldh7bJS9t Tolerance
3939+0.025
0    		12±0.02153.3+0.2
  0
4040
4141
4242
4343
4444
4545143.8
4646
4747
4848
4949
5050

Basic information

Module 2.5 Environmentally Friendly RoHS compliant (10 substances) Properties / applications Not Applicable
Material EN 1.1191 Equiv. Face Width(mm) 25

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795Suggestion of an applicable part number.

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Basic Attributes

  • Number of Teeth(Teeth)

    • 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

    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., Shaft Dia.

     [8-60/1]

    Clear

  • Gear Shape

    • Shape A
    • Shape B

    Clear

  • Type

    • HGEARB
    • HGEARBB
    • HGEARBG
    • HGEARHB
    • HGEARHBB
    • HGEARHBG
    • HGEARKB
    • HGEARKBB
    • HGEARKBG

    Clear

  • Twisting Direction

    • Right
    • Left

    Clear

  • Filter by CAD data type

    • 2D
    • 3D

    Clear

Filter by standard shipping days

    • All
    • 7 Days or Less

    Reset

Optional Attributes

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