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Catalog Number of Stock Gears
Material TypeS S45C RT Pawls and Ratchets
KGC Gear CouplingV Involute Spline
Other Products
S V 20 - 200K Total Length (200 mm)
Major Diameter (20 mm)
Type (Involute spline shafts)
Material (S45C)
Other Products
Feature Icons
The Catalog Number for KHK stock gears is based on the simple for-mula listed below. Please order KHK gears by specifying the Catalog Numbers. (Example)
RoHS Compliant Product
Stainless Product
Re-machinableProduct
Resin Product
Finished ProductCopper Alloy Product
Heat Treated Product
Injection Molded Product
Ground GearBlack Oxide coated Product
KSRT • KSRTB • KSRT-CPawls & Ratchets
P2.09~12.56 Page 580
KSV • KSVIInvolute Spline Shafts,
Spline Bushings
m1.667 Page 588
KGC • KGC-IGear Couplings
m2, 2.5 Page 584
KQSGA • KQSGMaster Gears (Spur Gear)
m0.4~1 Page 592
KGCUGear Assembly Kit
Page 364
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Characteristics of Pawls and Ratchets
• A simple structure used to restrict the rotational direction in one-way. • The tips of pawls and the teeth of ratchets are induction
hardened and therefore have superior durability.
KSRT • KSRTB • KSRT-C
Ratchets • Pawls
Features
Points to observe during use
• No secondary operations can be performed on tooth areas including the bottom land (approx. 1 to 2 mm), due to gear teeth induction hardened.
• The pawls are designed to prevent reverse rotation. They are not suit-able for use as driving ratchets or driving rotation.
• KSRT2/ 3-C is manufactured using a lost wax casting method.• Regarding KSRTB ratchets with hubs, please note the
direction of teeth, viewing from the hub side. KHK can pro-duce ratchets which have the teeth pointed in the opposite direction as a custom order item.
Assembly example: Stock Gears Sample Units
Bending strength of Ratchets
The allowable transmission forces Fb (N) of ratchets is the value calcu-lated by the following formula.
Also, the KSRT Ratchet's allowable torque T (N • m) for bending strength is calculated by the following formula.
T = Fb • rf
Where
Fb=σb • b • e2
6 • •
1h
1SF
= Bending stress (Assumed 225.55MPa)= Face width E (mm)= Root length (mm)
= Depth of teeth (H) (mm)= Safety factor (Assumed 2)=Tooth root radius (m)
σb
be
hSF
rf
e=Depth of teeth (h) × tan 60 -360
No. of teeth (z)
→ rf = Outside dia. D-(2 • h)2000
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Ratchets & Pawls
Application
KSRT Ratchet
KSRT-C Pawls
Example: ratchets used for complete reverse prevention of worm gears *
KSRT-C Pawls
KSRT Ratchet
Motor
Example: KSRT Ratchets used as a free-fall prevention mechanism of a lift device*
Lifti
ng D
evic
e
KSRT • KSRTB
* The illustration is a design example, not a design for machinery or a device in actual use.
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PawlsPitch 2.09~12.56KSRT-C
I
E
A DH
J
T4
Specifications
Angle of teeth 60°
Material S45C
Heat treatment Induction hardened teeth
Tooth hardness 50~60HRC
Specifications
Angle of teeth 60°
Material S45C
Heat treatment Induction hardened teeth
Tooth hardness 50~60HRC
Catalog No. Pitch No. of teeth ShapeBore Hub dia. Outside dia. Face width Hub width Total length Depth of teeth Center distance Mounting distance
A B D E F G H I JKSRT2/3-50KSRT2/3-60KSRT2/3-80KSRT2/3-90KSRT2/3-100
2.09
50608090
100
T4
1010121212
—
33.34053.36066.6
6 — 6 1
33.8435.5139.4841.7344.11
15.671925.672932.33
KSRT1-50KSRT1-60KSRT1-80KSRT1-90KSRT1-100
3.14
50608090
100
T4
1215151515
—
50608090
100
12 — 12 1.6
45.4848.2454.7358.3562.16
23.428.438.443.448.4
KSRT2-30KSRT2-40KSRT2-50KSRT2-60
6.28
30405060
T4
15151515
—6080
100120
15 — 15 3.1
61.2366.2372.2879.14
26.936.946.956.9
KSRT3-30KSRT3-40KSRT3-50
9.42304050
T4152020
—90
120150
20 — 20 576.3285.1595.52
405570
KSRT4-30KSRT4-40KSRT4-50
12.56304050
T4202020
—120160200
25 — 25 7.495.74
108.03122.37
52.672.692.6
KSRTB2/3-50KSRTB2/3-60KSRTB2/3-80KSRTB2/3-90KSRTB2/3-100
2.09
50608090
100
T9
1010121212
2530354040
33.34053.36066.6
6 10 16 1
33.8435.5139.4841.7344.11
15.671925.672932.33
KSRTB1-50KSRTB1-60KSRTB1-80KSRTB1-90KSRTB1-100
3.14
50608090
100
T9
1215151515
3540505050
50608090
100
12 12 24 1.6
45.4848.2454.7358.3562.16
23.428.438.443.448.4
KSRTB2-30KSRTB2-40KSRTB2-50KSRTB2-60
6.28
30405060
T9
15151515
50606065
6080
100120
15 14 29 3.1
61.2366.2372.2879.14
26.936.946.956.9
KSRTB3-30KSRTB3-40KSRTB3-50
9.42304050
T9152020
758085
90120150
20 16 36 576.3285.1595.52
405570
KSRTB4-30KSRTB4-40KSRTB4-50
12.56304050
T9202020
9090
100
120160200
25 18 43 7.495.74
108.03122.37
52.672.692.6
(N)
M
K
P
(L)60° FD
T5* FD has die-forged finish.
RatchetsPitch 2.09~12.56KSRT • KSRTB
c Due to gear teeth induction hardened, no secondary operations can be performed on tooth areas including the bottom land (approx. 1 to 2 mm).
[Caution on Product Characteristics]
[Caution on Secondary Operations]
a Regarding KSRTB ratchets with hubs, please note the direction of teeth, viewed from the hub side. QTC can produce ratchets that have teeth pointed in the opposite direction as a custom order item.b Due to heat treating, some deformation of the bore may occur. It may be necessary to ream the bore to bring to the stated dimensions.
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Ratchets
A B D
I
J
H
E FG
T9
Allowable torque (N • m) Allowable torque (kgf • m) Weight
(kg)Catalog No.
Shear strength of keyways Shear strength of keyways
3.074.10 6.00 7.118.24
0.310.420.610.730.84
0.0350.0530.0960.120.15
KSRT2/3-50KSRT2/3-60KSRT2/3-80KSRT2/3-90KSRT2/3-100
14.7 19.5 29.4 34.5 39.4
1.501.993.003.524.02
0.160.240.440.560.70
KSRT1-50KSRT1-60KSRT1-80KSRT1-90KSRT1-100
29.0 49.2 70.8 94.3
2.965.027.229.61
0.280.530.851.24
KSRT2-30KSRT2-40KSRT2-50KSRT2-60
92.6 158 229
9.4416.123.3
0.861.582.54
KSRT3-30KSRT3-40KSRT3-50
226 385 559
23.039.357.0
1.893.535.66
KSRT4-30KSRT4-40KSRT4-50
3.07 4.10 6.00 7.11 8.24
0.310.420.610.730.84
0.0670.100.160.210.24
KSRTB2/3-50KSRTB2/3-60KSRTB2/3-80KSRTB2/3-90KSRTB2/3-100
14.7 19.5 29.4 34.5 39.4
1.501.993.003.524.02
0.240.340.610.730.87
KSRTB1-50KSRTB1-60KSRTB1-80KSRTB1-90KSRTB1-100
29.0 49.2 70.8 94.3
2.965.027.229.61
0.470.821.141.59
KSRTB2-30KSRTB2-40KSRTB2-50KSRTB2-60
92.6 158 229
9.4416.123.3
1.402.173.22
KSRTB3-30KSRTB3-40KSRTB3-50
226 385 559
23.039.357.0
2.754.386.72
KSRTB4-30KSRTB4-40KSRTB4-50
Catalog No. Shape K (L) M (N) PWeight
(kg)
KSRT2/3-CKSRT1-CKSRT2-CKSRT3-CKSRT4-C
T5
58
101213
(8)(10)(12.5)(15)(18)
3039556580
(38)(49)(67.5)(80)(98)
612152025
0.0200.0570.130.230.38
a The pawls are designed to prevent reverse rotation. They are not suitable for use as driving ratchets or driving rotation.
b KSRT2/3-C is manufactured using a lost wax casting method.
[Caution on Product Characteristics]
Pawls
KSRT-C
KSRT • KSRTB
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Gear Couplings KGC • KGC-I
Features
Points to observe during use
• If you require one set of KGC2-30, you will need one KGC2-I (outer
ring) and two KGC2-30 (inner hubs). These components may also be pur-
chased separately. Therefore, please specify set or each when ordering.
• Inner hubs come with snap rings, S type products have prepared mini-mum bores and finished products come with set screws.
• Due to the gear teeth being induction hardened, no secondary operations can
be performed on tooth areas including the bottom land (approx. 1 to 2 mm).
Characteristics of Gear Couplings
• There are many ways to couple shafts to transmit power. We have developed
these standardized gear couplings of our own design. They are easier to con-
nect or disconnect than chain couplings.
• The gear teeth of the inner hubs are crowned to allow for up to 5° of shaft angle
offset.
• Due to induction hardened gear teeth, these couplings have excellent durability. All
surfaces are plated (Trivalent-chromate).
• The units are machined complete with keyways, set screw holes and finished
bores and are ready for immediate installation. We also offer minimum bore
models for users who want to perform their own secondary operations.
Inner hub
Outer ring
Inner hub
Snap Ring Groove
Strength of Gear Couplings
Tolerance torques of the gear couplings are determined in accordance
with the shear strength of the keys. Allowable shear force of keys F (N)
are calculated from the following formula.
F = b • L • σ •
Additionally, allowable torques (T) of the inner hubs of the gear coupling,
versus shear force of keys, can be calculated from the formula below.
T =
: Key Width (mm)→Keyway width of inner hubs of the KGC Gear Coupling
: Key Length (mm)→ Set at –2 mm from the total length of the inner hub
of the KGC Gear Coupling
: Allowable Shear Force of keys→Set at 49MPa (5kgf/mm2)
: Safety Factor→Optionally set
: Bore size (mm)→Bore size A of the inner hub of the KGC Gear Coupling
Caution: Safety Factor (S) must be set at a value between 1 to 3, de-
pending on the load types or the coupling displacement.
1s
F • d2000
b
L
σ
s
d
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Gear Couplings
Application
Turning table
KGC Inner hubKGC Outer ring
Motor
Specific usage for turning the work having no shafts or bores.
Assembly Example: KHK Stock Gears Sample Unit
Module 2 to 2.5
b
L
σ
s
d
KGC
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Gear Couplings (Inner hub)KGC
Gear Couplings (Outer ring)Module 2~2.5
Module 2~2.5
KGC-I
G
BD C
FEK
AM
L
T2
E
A C D
T1
Specifications
Gear teeth Standard full depth
Pressure angle 20° (Crowing)
Material S45C
Heat treatment Tooth surface induction hardened
Tooth hardness 50~60HRC
Catalog No. ModuleNo. of teeth
ShapeBore Hub dia. Pitch dia. Outside dia. Face width Hub width Total length Set Screw
A B H7 C D E F G Size L
KGC1-12SKGC1-20KGC1-22KGC1-25
m2 25
T2TKTKTK
12202225
45 50 54 10 25 35
—M5M6M6
—101010
KGC2-20SKGC2-30KGC2-32KGC2-35KGC2-40
m2 40
T2TKTKTK
2030323540
70 80 84 15 40 55
—M6
M10M10M10
—13131313
KGC3-20SKGC3-45KGC3-50
m2.5 42T2TKTK
204550
90 105 110 20 45 65—
M10M10
—2020
Catalog No. Module No. of teeth ShapeInternal dia. Pitch dia. Outside dia. Face width Backlash
(mm)
Weight
(kg)A C D E
KGC1-IKGC2-IKGC3-I
m2m2m2.5
254042
T14676
100
5080
105
68105145
253648
0.40~0.600.331.032.96
a S-type products are of minimum bore depth. Keyways are made according to JIS B1301 standards, Js 9 tolerance.b For products with a snap ring and a tapped hole, a set screw is included as an accessory.c The allowable torques in the table are obtained from the shear strength of keyways. The shear strength of keyway is assumed to be 49MPa (5kgf/mm2).d Since trivalent-chromate treatment is applied, changes may occur in the dimensions of the bore, keyway etc., decreasing by a few μ m.
[Caution on Product Characteristics]
a Due to the gear teeth being induction hardened, no secondary operations can be performed on tooth areas including the bottom land (approx. 1 to 2 mm).
[Caution on Secondary Operations]
[Caution on Secondary Operations]
Specifications
Gear teeth Standard full depth
Pressure angle 20°
Material S45C
Heat treatment Tooth surface induction hardened
Tooth hardness 50~60HRC
a Due to the gear teeth being induction hardened, no secondary operations can be performed on tooth areas including the bottom land (approx. 1 to 2 mm).
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Gear Couplings (Inner hub)
Gear Couplings (Outer ring)
G
BD C
FEK
AMJL
TK
C-Shaped Snap Ring Groove Total Width of Gear Coupling Keyway Allowable torque (N • m) Allowable torque (kgf • m) Backlash
(mm)
Weight
(kg)Catalog No.
K L M N Width×Depth Shear strength of keyways Shear strength of keyways
23 1.95 42.5 73
—5 x 2.37 x 37 x 3
—68.7 98.1
137
—7.00
10.0 14.0
0.40~0.60
0.430.370.350.32
KGC1-12SKGC1-20KGC1-22KGC1-25
37 2.7 67 115
—7 x 3
10 x 3.310 x 3.310 x 3.3
—245 294 392 490
—25.0 30.040.050.0
0.40~0.60
1.661.481.421.361.23
KGC2-20SKGC2-30KGC2-32KGC2-35KGC2-40
42 3.2 86.5 135—
12 x 3.312 x 3.3
—785 883
—80.090.0
0.40~0.603.432.742.56
KGC3-20SKGC3-45KGC3-50
N
KGC-I
KGC
For products not categorized in our Stock Gear series', custom gear production services is available. For details see page VI.
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Involute Spline Shafts & BushingsKSV • KSVI
Features
Points to observe during use
Characteristics of Gear Couplings
• KSV and KSVI series are made according to the automotive involute
spline standard, JIS D 2001: 1959 (FLAT ROOT SIDE FIT, Backlash 0.06 to 0.15)
• Involute spline shafts and bushings are thermal refined to have good
abrasion-resistance.
• Spline bushings may be made in CAC (bronze) type material as a
special custom order item.
The surface strength of SplineThe design concept of the spline surface strength is the same as that of a key. Here is the formula for the allowable transmission force (N) of spline.
F=η • z • hw • l • σ
And the formula of allowable torque T (N • m) of spline with respect to the surface strength.
T=
In designing a spline shafts, besides considering the surface strength, we should take into account the torsional and bending stresses of the spline.
Here
: Contact ratio of surface→0.75 (assumed) : Number of teeth→number of teeth (z) of spline from the table : Contact depth of tooth→1.485 : Contact length of spline→Total length (A) of involute spline bushing : Allowable surface stress of spline→19.61MPa (2kgf/mm2) (assumed) : Contact diameter (mm)→Tip diameter of spline shaft D - hw
ηzhw
lσdw
F • dw
2000
• Be sure not to bend shafts or break teeth when performing
secondary operations on KSV Involute Spline shafts.
• When using KSVI Spline Bushings with sliding movement,
lubrication is necessary on the sliding surface. To prevent
scuffing, it is recommended to apply lubricating grease. If
used in applications where oil contamination is not desir-
able, solid lubrication is recommended.
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Involute Spline Shafts & Bushings
Application
KSV Involute Spline Shafts are used in shift transmission mechanisms
Slide Bar
KSV Involute Spline Shaft
KSV Involute Spline Bushing
Assembly Example: Stock Gears Sample Unit
KSV
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Involute Spline ShaftsModule 1.667KSV
Involute Spline BushingsModule 1.667KSVI
d D
GEF’ F
d
TA
EA D
T1
Specifications
Gear teeth Stub teeth
Pressure angle 20°
Material S45C
Heat treatment Thermal refined
Tooth hardness 200~270HB
Specifications
Gear teeth Stub teeth
Pressure angle 20°
Material S45C
Heat treatment Thermal refined
Tooth hardness 200~270HB
Catalog No. Module No. of teeth ShapeOutside dia. Shaft dia. Face width Shaft length (R) Shaft length (L) Total length Backlash
(mm)
Weight
(kg)D d E F F' G
KSV17-170KSV20-200KSV25-250KSV30-300
m1.667
8101316
TA TATBTB
16.6719.6724.6729.67
13152025
135165220270
2020——
15153030
170200250300
0.06~0.150.06~0.150.06~0.150.06~0.15
0.260.430.881.55
Catalog No. Module No. of teeth ShapeInternal dia. Outside dia. Face width Allowable torque (N • m) Allowable torque (kgf • m) Backlash
(mm)
Weight
(kg)A D E Surface durability Surface durability
KSVI17-40KSVI20-45KSVI25-55KSVI30-65
m1.667
8101316
T1
13.716.721.726.7
40455565
25303845
33.2 59.6
125 222
3.38 6.08
12.8 22.6
0.06~0.150.06~0.150.06~0.150.06~0.15
0.210.310.570.93
a Be sure not to bend shafts or break teeth when performing secondary operations on KSV Involute Spline shafts.[Caution on Secondary Operations]
+ 0 . 2 5+ 0 . 1 5
[Caution on Product Characteristics] a The allowable torques are calculated based on “The surface strength of Spline” . b It is essential to apply lubricant on contact surface of the spline shaft and the hub. To prevent scuffing, it is recommended to apply lubricating grease. If used in applications where oil contamination is not desirable, solid lubrication is recommended.
For products not categorized in our Stock Gear series', custom gear production services with short lead times is available. For details see page VI.
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Involute Spline Bushings
GE F
Dd
TB
Catalog No. Module No. of teeth ShapeOutside dia. Shaft dia. Face width Shaft length (R) Shaft length (L) Total length Backlash
(mm)
Weight
(kg)D d E F F' G
KSV17-170KSV20-200KSV25-250KSV30-300
m1.667
8101316
TA TATBTB
16.6719.6724.6729.67
13152025
135165220270
2020——
15153030
170200250300
0.06~0.150.06~0.150.06~0.150.06~0.15
0.260.430.881.55
KSVI
Involute Spline Shafts
KSV
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inio
nsM
iter
Gea
rsB
evel
Gea
rsS
crew
Gea
rsW
orm
Gea
r P
air
Bev
elG
earb
oxes
Oth
erP
rod
ucts
592
Catalog No. Module No. of teeth ShapeBore Hub dia. Pitch dia. Outside dia. Face width Hub width Total length
AH7 B C D E F GKQSGA0.4KQSGA0.45KQSGA0.5KQSGA0.55KQSGA0.6
0.40.450.50.550.6
10088807266
S5 10 —
40.039.640.039.639.6
40.840.541.040.740.8
10 — 10KQSGA0.65KQSGA0.7KQSGA0.75KQSGA0.8KQSGA0.9KQSGA1.0
0.650.70.750.80.91
625854504440
40.340.640.540.039.640.0
41.642.042.041.641.442.0
Catalog No. Module No. of teeth ShapeBore Hub dia. Pitch dia. Outside dia. Face width Hub width Total length
AH7 B C D E F GKQSG0.4KQSG0.45KQSG0.5KQSG0.55KQSG0.6
0.40.450.50.550.6
10088807266
S0 12.7 22.5
40.039.640.039.639.6
40.840.541.040.740.8
12.7 0.8 14.3KQSG0.65KQSG0.7KQSG0.75KQSG0.8KQSG0.9KQSG1.0
0.650.70.750.80.91
625854504440
40.340.640.540.039.640.0
41.642.042.041.641.442.0
Specifications
Precision grade JIS grade M00 (JIS B 1751)
Gear teeth Standard full depth
Pressure angle 20°
Material SK3
Heat treatment Vacuum Hardening
S5
A B C DB
E
G
G
G
G G
G G
S0
Master Gears (Spur Gear)Module 0.4~1KQSGA • KQSG
Master Gears are high precision gears used in meshing test machines. We proudly provide master gears with technologies acquired through our experience in manufacturing standard gears. * These gears are not for power transmission.* Meshing Pitch Inspection Data is included for these products.
High Precision Master Gears for meshing test machine.
Available ProductionWe accept orders even for gears with special specifications, such us Helical Gears. Please feel free to contact us.
Module: 0.4 to 1 Number or Teeth: can be designated as you request. Pressure Angles: Available for various sizes, such as 14.5°, 20° and 22.5°.
Master Gears are available by request
[Caution on Product Characteristics] Produced as custom order products, these gears requires a lead-time for shipping (from the factory) 20 working-days after placing an order. Please allow additional shipping time to get to your local distributor.
[Caution on Product Characteristics] Produced as custom order products, these gears requires a lead-time for shipping (from the factory) 20 working-days after placing an order. Please allow additional shipping time to get to your local distributor.
