MOM-K

Flexible Couplings - Oldham Type - Set Screw + Key Type

RoHS Compliant

High torsional rigidity
High Torque

MOM/MOM-C/MOM-K/MOM-CK_CFlexible Couplings - Oldham Type

Dimension Drawing
Specs/CAD
Structure
Material/Finish
Characteristics

Dimension Drawing

Specs/CAD

mm inch

Part Number	AA	LL	WW	EE	FF	M	Screw Tightening Torque (N・m)Screw Tightening Torque (lbf in.)	Standard Bore Diameter (Dimensional Allowance H8) D₁-D₂	Price (USD)	CAD	Add to Cart
MOM-15K	150.591	5.40.213	16.60.654	6.90.272	2.70.106	M3	0.76.19	-	58.53	CAD	Cart
MOM-17K	170.669	6.70.264	20.40.803	7.30.287	3.350.132	M3	0.76.19	-	62.49	CAD	Cart
MOM-20K	200.787	70.276	220.866	11.10.437	3.50.138	M3	0.76.19	-	66.86	CAD	Cart
MOM-26K	261.024	90.354	26.61.047	13.30.524	4.50.177	M4	1.715.04	-	74.19	CAD	Cart
MOM-30K	301.181	120.472	341.339	15.50.61	60.236	M4	1.715.04	-	80.76	CAD	Cart
MOM-34K	341.339	130.512	351.378	17.50.689	6.50.256	M5	435.4	-	87.30	CAD	Cart
MOM-38K	381.496	150.591	40.51.594	21.50.846	7.50.295	M5	435.4	-	99.59	CAD	Cart
MOM-45K	451.772	150.591	45.21.78	24.30.957	7.50.295	M5	435.4	-	139.28	CAD	Cart
MOM-55K	552.165	170.669	512.008	27.71.091	8.50.335	M6	761.95	-	355.04	CAD	Cart
MOM-70K	702.756	200.787	58.62.307	38.51.516	100.394	M8	15132.75	-	436.35	CAD	Cart

Part Number	Max. Bore Diameter (mm)	Rated Torque^＊1 (N・m)Rated Torque^＊1 (lbf in.)	Max. Torque (N・m) 1Max. Torque (lbf in.) 1	Max. Rotational Frequency (min^-1)	Moment of Inertia (kg・m²)^＊2Moment of Inertia (oz. in.²)^＊2	Static Torsional Stiffness (N･m/rad)Static Torsional Stiffness (lbf in./deg)	Max. Angular Misalignment (°)	Max. Lateral Misalignment (mm) ^3Max. Lateral Misalignment (in.) ^3	Mass (g) ^＊2Mass (oz) ^＊2
MOM-15K	7	3.329.21	6.658.41	2000	5.7×10-70.031	870134.38	2	0.30.012	170.6
MOM-17K	8	5.548.68	1197.35	2000	1.1×10-60.06	1300200.8	2	0.30.012	260.92
MOM-20K	10	7.768.15	15.4136.29	2000	2.4×10-60.131	1700262.58	2	0.40.016	371.3
MOM-26K	12	1197.35	22194.7	2000	8.4×10-60.459	3200494.27	2	0.50.02	782.75
MOM-30K	15	26230.1	52460.2	2000	1.8×10-50.984	4600710.52	2	0.60.024	1304.59
MOM-34K	16	35309.75	70619.5	2000	3.2×10-51.75	6000926.76	2	0.70.028	1786.28
MOM-38K	20	55486.75	110973.5	2000	5.7×10-53.116	74001143	2	0.80.031	2418.5
MOM-45K	22	66584.1	1321168.2	2000	1.2×10-46.561	160002471.36	2	10.039	38413.54
MOM-55K	28	99876.15	1981752.3	2000	3.1×10-416.949	300004633.8	2	1.20.047	65022.93
MOM-70K	35	1761557.6	3523115.2	2000	9.3×10-450.848	460007105.16	2	1.40.055	120042.32

＊1：　Correction of rated torque and max. torque due to load fluctuation is not required.
＊2：　These are values with max. bore diameter.
*3: The max. lateral misalignment varies depending on the load torque and revolution.

Part Number	Standard Bore Diameter (Dimensional Allowance H8) D₁･D₂
Part Number	6	6.35	8	10	12	14	15	16	18	20	22	24	25	28	30	35
MOM-15K	●	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-
MOM-17K	●	-	●	-	-	-	-	-	-	-	-	-	-	-	-	-
MOM-20K	●	●	●	●	-	-	-	-	-	-	-	-	-	-	-	-
MOM-26K	●	●	●	●	●	-	-	-	-	-	-	-	-	-	-	-
MOM-30K	-	-	●	●	●	●	●	-	-	-	-	-	-	-	-	-
MOM-34K	-	-	-	●	●	●	●	●	-	-	-	-	-	-	-	-
MOM-38K	-	-	-	●	●	●	●	●	●	●	-	-	-	-	-	-
MOM-45K	-	-	-	-	●	●	●	●	●	●	●	-	-	-	-	-
MOM-55K	-	-	-	-	-	-	●	●	●	●	●	●	●	●	-	-
MOM-70K	-	-	-	-	-	-	-	-	●	●	●	●	●	●	●	●

● All products are provided with hex socket head cap screw.
● Recommended tolerance for shaft diameters is h6 and h7.
● A set of hubs with set screw type for one side and clamping type for the other side is available upon request.
● Bore and keyway modifications are available on request. Please contact our customer service.

Part Number
Amount
Price（＄）

Check other products Cart

Modified Part Number

Enter the desired bore diameter and then click [Check Modified Part Number].

Standard bore diameter(D1)	Standard bore diameter(D2)	Modified Part Number	Price	Add to cart
mm inch mm in. keyway	mm inch mm in. keyway			Cart

unit:mm
Shaft Hole D₁D₂					keyway				Key
					b		t		Nominal Dimension b×h
					Basic Dimension	Allowance (JS9)	Basic Dimension	Allowance	Nominal Dimension b×h
6	7				2	±0.0125	1.0	+0.1 0	2×2
8	9	10			3	±0.0125	1.4		3×3
11	12				4	±0.0150	1.8		4×4
13	14	15	16	17	5	±0.0150	2.3		5×5
18	19	20	22		6	±0.0150	2.8		6×6
24	25	28	30		8	±0.0180	3.3	+0.2 0	8×7
32	35	36	38		10	±0.0180	3.3		10×8
40	42	44			12	±0.0215	3.3		12×8
45	48	50			14	±0.0215	3.8		14×9

Refer to the "Couplicon Bore Diameter Additional Modification Service" for more information.
BT： Additional modification of bore
KT： Metric Keyway Modification (JIS Standard)
KA： Inch Keyway Modification (AGMA Standard)

Slip torque

As in the table below, the clamping type MOM-C has different slip torque according to the bore diameter. Take care during selection.

Unit : N・m

Part Number	Bore Diameter
Part Number	3	4	5	6	6.35	8	10	12	14	15	16	18	20	22	24	25	28	30	35
MOM-15C	0.3	0.5	0.8	1
MOM-17C		2.1	3.5	3.7
MOM-20C			3.8	6	6	6.8	7.5
MOM-26C				5.4	5.4	5.8	6.6	8.7
MOM-30C						7.4	12	14	15
MOM-34C							13	13	15	16	16
MOM-38C							16	18	20	23	25	28	31
MOM-45C								47	48	56	56	57	62
MOM-55C										42	54	55	56	89	93	97
MOM-70C												62	92	95	97	100	110	120	130

These are test values based on the conditions of shaft dimensional allowance: h7, hardness: 34-40 HRC, and screw tightening torque of the values described in MOM-C dimension tables. They are not guaranteed values.
Slip torque changes with usage conditions. Carry out tests under conditions similar to actual conditions in advance.

Structure

Set Screw Type

MOM MOM

MOM/MOM-C/MOM-K/MOM-CK_CFlexible Couplings - Oldham Type

Clamping Type

MOM-C MOM-C

MOM/MOM-C/MOM-K/MOM-CK_CFlexible Couplings - Oldham Type

Set Screws + Key Type

MOM-K MOM-K

MOM/MOM-C/MOM-K/MOM-CK_CFlexible Couplings - Oldham Type

Clamping + Key Type

MOM-CK MOM-CK

MOM/MOM-C/MOM-K/MOM-CK_CFlexible Couplings - Oldham Type

Material/Finish

	MOM-K
Hub	S45C Ferrosoferric Oxide Film (Black)
Spacer	FCD400 Ferrosoferric Oxide Film (Black)
Pin	Polyacetal
Hex Socket Set Screw	SCM435 Ferrosoferric Oxide Film (Black)
Hex Socket Head Cap Screw	SCM435 Ferrosoferric Oxide Film (Black)
Grease	Lithium Soap Grease Nippeco DXL-No.1 Made by Nippeco

Characteristics

Recommended Applicable Motor

	MOM
Servomotor	●
Stepping Motor	●
General-purpose Motor	◎

◎: Excellent ○: Very good ●: Available

Property

	MOM
High Torque	◎
High Torsional Stiffness	◎
Allowable Misalignment	○

◎: Excellent ○: Very good

This is an oldham type flexible coupling.
FCD400 is adopted in the spacer. Suitable for low-speed and high-torque specification.
High performance grease is applied in the gap between hubs and the spacer in order to prevent sticking.
Slippage of hubs and a spacer allows large eccentricity and angular misalignment to be accepted.
A projection placed in the spacer (resin pin) allows angular misalignment to be effortlessly accepted.

The grease accumulated in a grease hole will gradually seep out during operation, thereby maintaining the lubrication property over a long period.

MOM/MOM-C/MOM-K/MOM-CK_CFlexible Couplings - Oldham Type

Application

Mixer / Pump / Small power press / Grinder

Precautions for Use

Please apply grease periodically in order to prevent sticking of hubs and a spacer.

Selection

Selection Based on Shaft Diameter and Rated Torque

The area bounded by the shaft diameter and rated torque indicates the selection size.

MOM/MOM-C/MOM-K/MOM-CK_CFlexible Couplings - Oldham Type

Selection Example

In case of selected parameters of shaft diameter of φ6 and load torque of 4N•m, the selected size is MOM-17.

Details of Shaft Hole

MOM-KFlexible Couplings - Oldham Type - Set Screw + Key Type

Unit : mm

Standard Bore Diameter D	Keyway				Key
	b		t		Nominal Dimension b x h
	Standard Dimension	Allowance (JS9)	Standard Dimension	Allowance	Nominal Dimension b x h
6・6.35	2	±0.0125	1.0	0 - +0.1	2 × 2
8	3	±0.0125	1.4	0 - +0.1	3 × 3
10・12	4	±0.0150	1.8	0 - +0.1	4 × 4
14・15・16	5	±0.0150	2.3	0 - +0.1	5 × 5
18・20・22	6	±0.0150	2.8	0 - +0.1	6 × 6
24・25・28・30	8	±0.0180	3.3	0 - +0.2	8 × 7
35	10	±0.0180	3.3	0 - +0.2	10 × 8

Excerpt from JIS B 1301

Comparison of Rated Torque

MOM-KFlexible Couplings - Oldham Type - Set Screw + Key Type

Comparison of Static Torsional Stiffness

MOM-KFlexible Couplings - Oldham Type - Set Screw + Key Type

Change in static torsional stiffness due to temperature

This is a value under the condition where the static torsional stiffness at 20°C is 100%. The change of MOM in torsional stiffness due to temperature is small and the change in responsiveness is extremely small.
If the unit is used under higher temperature, be careful about misalignment due to elongation or deflection of the shaft associated with thermal expansion.

MOM/MOM-C/MOM-K/MOM-CK_TTechnical Information