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Change nut

Volume Discount

The nut and shaft are sold separately. Use together with THK nuts and shafts (DCMA, DCMB, CT). The shaft is cut with no surface treatment.

[Features]
· Change nut DCMA shape and DCMB shape are 45° lead angle change nuts that are difficult to produce with machining machinery.
· Can be used for simple conversion of straight line movement into rotation and rotation into straight line movement at 70% efficiency. Features a large lead, making it optimal for creating speeding up mechanisms for slow rotation.
· The multi-axis screws used in combination with change nuts are molded with cold forging.
· The exterior surface of the dental mold is machined to a hardness of 250HV or more and treated with mirror surface finishing, providing extremely smooth operation and high abrasion resistance in combination with change nuts.

(i)Caution

Some of the items are scheduled to be discontinued as of end of March in 2023. The manufacturer keep the items produced but they are not available with Misumi.
There are not the replacement items and the plan to resumption of sale. Please check the quotation and order screen for details.

Part Number

Configured Part Number is shown.

Product Specifications
Part Numbers
Catalog

Drawing

Specifications Table

Change nut part number^{Note 1)}	External dimensions			Change nut dimensions
	Outer diameter		Length L	Flange diameter D₁	H	B	PCD	r	F	d
	D	Tolerance h9	Length L	Flange diameter D₁	H	B	PCD	r	F	d
DCMB 8T^{Note 2)}	15	0 -0.1	16	28	4	3.4	21	0.8	-	-
DCMB 12T^{Note 2)}	20	0 -0.1	25	36	5	4.5	27	1	-	-
DCMA 15T DCMB 15T	22	0 -0.052	15	44	6	5.4	31	1.5	4.5	1.5
DCMA 15T DCMB 15T	22		30	44	6	5.4	31	1.5	4.5	1.5
DCMA 17T DCMB 17T	28		15	51	7	6.6	38	1.5	4.5	1.5
DCMA 17T DCMB 17T	28		35	51	7	6.6	38	1.5	4.5	1.5
DCMA 20T DCMB 20T	32	0 -0.062	20	56	7	6.6	42	1.5	6.5	2
DCMA 20T DCMB 20T	32		40	56	7	6.6	42	1.5	6.5	2
DCMA 25T DCMB 25T	36		25	61	8	6.6	47	2	8.5	2
DCMA 25T DCMB 25T	36		50	61	8	6.6	47	2	8.5	2
DCMA 30T DCMB 30T	44		28	76	10	9	58	2	9	2
DCMA 30T DCMB 30T	44		56	76	10	9	58	2	9	2
DCMA 35T DCMB 35T	52	0 -0.074	30	84	10	9	66	2.5	10	3
DCMA 35T DCMB 35T	52	0 -0.074	60	84	10	9	66	2.5	10	3

Change nut part number^{Note 1)}	Screw Shaft Part Number^{Note 1)}	Multi-Start Screw Shaft Detail						Standard Shaft Length	Maximum Shaft Length	Dynamic Allowable Torque T^{Note 3)} N⋅m	Allowable Dynamic Thrust F ^{Note 3)} N	Flange Static Allowable Load P^{Note 4)} N	Weight
		Outer diameter D_k	Effective diameter D₀	Root diameter D_r	Lead R	Lead angle α°	Number of teeth Z						Change nut g	Screw shaft kg/m
		Outer diameter D_k	Effective diameter D₀	Root diameter D_r	Lead R	Lead angle α°	Number of teeth Z						Change nut g	Screw shaft kg/m
DCMB 8T^{Note 2)}	CT 8T	9	7.6	6.2	24	(45)	6	500	1,000	3.24	863	1,800	5	0.36
DCMB 12T^{Note 2)}	CT 12T	13.3	11.5	9.7	36	(45)	7	500, 1,000	1,500	12.7	1,370	2,800	10	0.82
DCMA 15T DCMB 15T	CT 15T	15.8	13.7	11.6	44.4	(45)	8	500, 1,000	1,500	16.7	2,300	13,800	60	1.2
DCMA 15T DCMB 15T	CT 15T	15.8	13.7	11.6	44.4	(45)	8	500, 1,000	1,500	32.4	4,610	13,800	85	1.2
DCMA 17T DCMB 17T	CT 17T	17.8	15.7	13.6	50	(45)	9	500, 1,000	1,500	20.6	2,600	28,100	95	1.5
DCMA 17T DCMB 17T	CT 17T	17.8	15.7	13.6	50	(45)	9	500, 1,000	1,500	48	6,080	28,100	140	1.5
DCMA 20T DCMB 20T	CT 20T	21.2	18.7	16.2	60	(45)	9	500, 1,000, 1,500	3,000	40.2	4,170	34,600	135	2.6
DCMA 20T DCMB 20T	CT 20T	21.2	18.7	16.2	60	(45)	9	500, 1,000, 1,500	3,000	79.4	8,330	34,600	210	2.6
DCMA 25T DCMB 25T	CT 25T	25.6	23.1	20.6	73.3	(45)	11	500, 1,000, 1,500	3,000	74.5	6,370	38,500	175	3.3
DCMA 25T DCMB 25T	CT 25T	25.6	23.1	20.6	73.3	(45)	11	500, 1,000, 1,500	3,000	148	12,700	38,500	280	3.3
DCMA 30T DCMB 30T	CT 30T	31.9	29.4	26.9	93.3	(45)	14	500, 1,000, 2,000	4,000	130	8,090	55,400	290	5.3
DCMA 30T DCMB 30T	CT 30T	31.9	29.4	26.9	93.3	(45)	14	500, 1,000, 2,000	4,000	269	16,200	55,400	465	5.3
DCMA 35T DCMB 35T	CT 35T	34.1	31.1	28.1	97.7	(45)	11	500, 1,000, 2,000	4,000	144	9,260	84,500	425	5.8
DCMA 35T DCMB 35T	CT 35T	34.1	31.1	28.1	97.7	(45)	11	500, 1,000, 2,000	4,000	287	18,500	84,500	670	5.8

Note 1) The T symbol attached to the nominal model number of the change nut (excluding DCMB8T and DCMB12T types) and screw shaft indicates rolling.
Each item can be purchased separately; in that case, please refer to the example of nominal model number configuration in the digital catalog. When ordering the change nut and screw shaft as a set, please specify the T symbol only at the end of the model number configuration (→ see the example of nominal model number configuration below).
Note 2) The materials for the miniature change nut DCMB8T and DCMB12T types use oil-impregnated plastic. (The dimensional tolerance for the outer diameter is special.)
Note 3) The allowable dynamic torque (T) and allowable dynamic thrust (F) indicate the values when the contact area of the screw tooth surface reaches 9.8 N/mm².
The maximum axial load (regardless of whether the system is stopped or in operation) must not exceed the allowable dynamic thrust, and selection should be made with consideration of the safety factor in Table 1 of the digital catalog.
Note 4) The static allowable load (P) of the flange indicates the strength of the flange against the type of load shown in the figure below.

Static allowable load of change nut flange

Product Feature Details

Features of the Dedicated Rolling Shaft

For the change nut, dedicated rolling shafts with standardized lengths are available.

Improved Abrasion Resistance
Because the tooth profile of the shaft is formed by cold rolling, the surface of the tooth surface is work-hardened to 250HV or higher, and also finished with a smooth mirror finish, providing excellent abrasion resistance. · Movement in combination with the change nut is also extremely smooth.

Improved Mechanical Property
In the tooth surface of the rolled shaft, the internal structure exhibits fiber flow along the contour of the tooth profile, resulting in an extremely dense structure at the tooth root and increased fatigue strength.

Alteration of Shaft End Support Section
Because the shaft is rolled, alterations such as to the shaft end support bearing section can be easily performed by turning or milling.

Selection Support Information

Example of Part Number Structure

Example of change nut part number configuration

Performance / Test Information

High-strength zinc alloy

The high-strength zinc alloy used in change nuts is a material with excellent seizure resistance, abrasion resistance, and load capacity. Its mechanical properties, physical properties, and abrasion resistance are as follows.
*The values below are reference values and are not guaranteed values.

Mechanical Properties

Tensile strength	275–314 N/mm²
Tensile Proof Strength (0.2%)	216–245 N/mm²
Compressive Strength	539–686 N/mm²
Compressive Proof Strength (0.2%)	294–343 N/mm²
Fatigue Strength	132 N/mm² × 10⁷ (Schenck-type bending test)
Charpy impact value	0.098–0.49 N⋅m/mm²
Elongation	1 to 5%
Hardness	120 to 145HV

Physical Properties

Specific gravity	6.8
Specific Heat	460 J/(kg·K)
Melting point	390°C
Linear expansion coefficient	24 x 10^-6

Abrasion resistance

Number of Test Piece Rotating Speed	185 min^-1
Load	392N
Lubricant	Dynamo oil

: 30; 45; 60

Part Number
CT8T+1000L
CT8T+500L
CT12T+1000L
CT12T+1500L
CT12T+500L
CT15T+1000L
CT15T+1500L
CT15T+500L
CT17T+1500L
CT20T+1000L
CT20T+3000L
CT25T+3000L
CT35T+500L
DCMA15T
DCMA17T
DCMA20T
DCMA25T
DCMB8T
DCMB12T
DCMB15T
DCMB17T
DCMB20T
DCMB25T
DCMB30T
DCMB35T

Standard Unit Price	Minimum order quantity	Volume Discount	Days to Ship	RoHS	Shaft End Shape	Screw Shaft Nominal O.D. (Ø)	Screw Shaft Length L (mm)	Types	Flange Length (mm)
MYR 490.58	1 Piece(s)	Available	12 Day(s) or more	10	Straight Type(Without End Shape Machining)	8	1000	Axis	-
MYR 286.53	1 Piece(s)	Available	34 Day(s) or more	10	Straight Type(Without End Shape Machining)	8	500	Axis	-
MYR 646.61	1 Piece(s)	Available	12 Day(s) or more	10	Straight Type(Without End Shape Machining)	12	1000	Axis	-
MYR 744.73	1 Piece(s)	Available	24 Day(s) or more	10	Straight Type(Without End Shape Machining)	12	1500	Axis	-
MYR 385.13	1 Piece(s)	Available	12 Day(s) or more	10	Straight Type(Without End Shape Machining)	12	500	Axis	-
MYR 737.18	1 Piece(s)	Available	5 Day(s) or more	10	Straight Type(Without End Shape Machining)	15	1000	Axis	-
MYR 945.00	1 Piece(s)	Available	24 Day(s) or more	10	Straight Type(Without End Shape Machining)	15	1500	Axis	-
MYR 441.69	1 Piece(s)	Available	5 Day(s) or more	10	Straight Type(Without End Shape Machining)	15	500	Axis	-
MYR 1,019.26	1 Piece(s)	Available	24 Day(s) or more	10	Straight Type(Without End Shape Machining)	17	1500	Axis	-
MYR 1,144.65	1 Piece(s)		12 Day(s) or more	10	Straight Type(Without End Shape Machining)	20	1000	Axis	-
MYR 2,228.50	1 Piece(s)	Available	23 Day(s) or more	10	Straight Type(Without End Shape Machining)	20	3000	Axis	-
MYR 2,569.85	1 Piece(s)	Available	23 Day(s) or more	10	Straight Type(Without End Shape Machining)	25	3000	Axis	-
MYR 1,262.21	1 Piece(s)	Available	22 Day(s) or more	10	Straight Type(Without End Shape Machining)	35	500	Axis	-
MYR 128.15	1 Piece(s)	Available	22 Day(s) or more	10	Nut Component	15	-	Nut (flange type)	Single
MYR 149.28	1 Piece(s)	Available	12 Day(s) or more	10	Nut Component	17	-	Nut (flange type)	Single
MYR 170.33	1 Piece(s)	Available	11 Day(s) or more	10	Nut Component	20	-	Nut (flange type)	Single
MYR 200.58	1 Piece(s)	Available	12 Day(s) or more	10	Nut Component	25	-	Nut (flange type)	Single
MYR 56.03	1 Piece(s)	Available	4 Day(s) or more	10	Nut Component	8	-	Nut (flange type)	Long
MYR 58.83	1 Piece(s)	Available	4 Day(s) or more	10	Nut Component	12	-	Nut (flange type)	Long
MYR 122.80	1 Piece(s)	Available	4 Day(s) or more	10	Nut Component	15	-	Nut (flange type)	Long
MYR 140.30	1 Piece(s)	Available	4 Day(s) or more	10	Nut Component	17	-	Nut (flange type)	Long
MYR 159.81	1 Piece(s)	Available	11 Day(s) or more	10	Nut Component	20	-	Nut (flange type)	Long
MYR 204.20	1 Piece(s)	Available	11 Day(s) or more	10	Nut Component	25	-	Nut (flange type)	Long
MYR 269.16	1 Piece(s)	Available	11 Day(s) or more	10	Nut Component	30	-	Nut (flange type)	Long
MYR 314.64	1 Piece(s)	Available	64 Day(s) or more	10	Nut Component	35	-	Nut (flange type)	Long

Product TOP

Basic Information

Type	Change Nuts	Thread Position	Right Screw

Configure

25 Part Numbers

View Part Numbers

Configure Remaining Specifications

Completed

Specification/Dimensions

Shaft End Shape
- Straight Type(Without End Shape Machining)
- Nut Component
Clear
Screw Shaft Nominal O.D.(Ø)
8

12

15

17

20

25

30

35
Clear
Screw Shaft Length L(mm)
500

1000

1500

3000
Clear
Types
- Axis
- Nut (flange type)
Clear
Flange Length(mm)
- Long
- Single
Clear
type
- CT
- DCMA
- DCMB
Clear
CAD
- 2D
- 3D
Clear

Days to Ship

All

4 Day(s) or Less

5 Day(s) or Less

11 Day(s) or Less

12 Day(s) or Less

22 Day(s) or Less

23 Day(s) or Less

24 Day(s) or Less

34 Day(s) or Less

64 Day(s) or Less
Clear

Specify Alterations

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

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9:00am - 1:00pm (Saturday); Technical Inquiry

How can we improve?

Change nut

(i)Caution

Drawing

Specifications Table

Product Feature Details

Features of the Dedicated Rolling Shaft

Selection Support Information

Example of Part Number Structure

Performance / Test Information

High-strength zinc alloy

Basic Information

Configure

Specification/Dimensions

Shaft End Shape

Screw Shaft Nominal O.D.(Ø)

Screw Shaft Length L(mm)

Types

Flange Length(mm)

type

CAD

Days to Ship

Specify Alterations

Additional Products in this Category

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