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Retaining Rings/Internal/C-Type (Part Numbers)

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Volume Discount

[Features]·A C-type retaining ring, internal. ·The unit of purchase is loose (available in quantities of 1 pc.). ·The retaining ring type is an inner ring retaining ring.

(i)Caution

[Specification Change] The material of stainless steel products will be changed sequentially starting in July 2025. Please see here for details.
There is a possibility that products and packages before and after the change may be mixed in the same shipment, but there will be no problems with use.
Please check the content on our website as the PDF does not contain the most up-to-date information.

Part Number

Configured Part Number is shown.

Drawing/Specifications
3D Preview
Part Numbers
Catalog

RTWN
RTWS(Stainless Steel)

Applicable Hole

d₄: Minimum circumferential diameter when a retaining ring is fitted inside d₁
(Clearance I.D.)

Type	[M] Material	[H] Hardness	[S] Surface Treatment
RTWN	Spring Steel	44 to 53HRC	Phosphate coating
RTWS	SUS304-CSP Equivalent	36 to 44HRC	-

Specifications

Part Number

RTWN10
RTWS20

Part Number		Retaining Ring							Reference:	Applicable Bore (Reference)
Part Number		Retaining Ring							Reference:	Applicable Bore (Reference)
Type	No.	D₃		t		b (Approx.)	a (Approx.)	d₀ (Min.)	d₄	d₁	d₂		m		n (Min.)
Type	No.	D₃	Tolerance	t	Tolerance	b (Approx.)	a (Approx.)	d₀ (Min.)	d₄	d₁	d₂	Tolerance	m	Tolerance	n (Min.)
RTWN RTWS (Stainless Steel)	10	10.7	±0.18	1	±0.05	1.5	2.8	1.2	4	10	10.4	+ 0.11 0	1.15	+ 0.14 0	1.5
	11	11.8				1.5	3	1.2	4	11	11.4
	12	13				1.7	3.1	1.5	5	12	12.5
	13	14.1				1.7	3.1	1.5	6	13	13.6
	14	15.1				1.9	3.6	1.7	7	14	14.6
	15	16.2					3.6		8	15	15.7
	16	17.3					3.7		8	16	16.8
	17	18.3	±0.2				3.8		9	17	17.8
	19	20.5				2.5	4	2	11	19	20	+ 0.21 0
	20	21.5					4		12	20	21
	21	22.5					4.1		12	21	22
	22	23.5					4.1		13	22	23
	24	25.9		1.2	±0.06		4.3		15	24	25.2		1.35
	25	26.9				3	4.4		16	25	26.2
	26	27.9					4.6		16	26	27.2
	28	30.1	±0.25				4.6		18	28	29.4
	30	32.1					4.7		20	30	31.4	+ 0.25 0
	32	34.4				3.5	5.2	2.5	21	32	33.7
	35	37.8		1.5			5.2		24	35	37		1.65		2
	37	39.8		1.5			5.2		26	37	39		1.65
	40	43.5	±0.4	1.75	±0.07	4	5.7		28	40	42.5		1.9
	42	45.5				4	5.8		30	42	44.5
	45	48.5				4.5	5.9		33	45	47.5
	47	50.5	±0.45			4.5	6.1		34	47	49.5
	52	56.2		2		5.1	6.5		39	52	55	+ 0.3 0	2.2
	55	59.2				5.1	6.5		41	55	58
	60	64.2				5.5	6.8		46	60	63
	62	66.2				5.5	6.9		48	62	65
	68	72.5		2.5	±0.08	6	7.4		53	68	71		2.7		2.5
	72	76.5				6.6	7.4		57	72	75
	80	85.5	±0.55			7	8		64	80	83.5	+ 0.35 0

Part Number

CAD Data download and 3D preview are not available because the part number has not yet been determined.

*In order to open the CAD Data download and 3D preview screen, the part number must be fixed.
Please confirm the part number from "Specification / Dimension"on the left side, and then perform the CAD Data Download / 3D Preview operation.

CAD Download

: 30; 60; 90

Part Number

Part Number	Minimum order quantity	Volume Discount	Days to Ship	RoHS	Nominal	Material	Shaft or Hole Used d1 (Reference) (mm)	Applicable Shaft or Hole d2 (Reference) (mm)	Shaft / Shaft Bore / Groove Nominal (Reference) (mm)

Product TOP

Basic Information

Type	Retained with Inner Ring	Shape	Standard Type (C-Ring)	Retaining Ring Type	Retained with Inner Ring
Mounting Method Type	Standard	Sales Unit	Low Quantity (Available beginning with 1 pc.)	Product Type	Retaining Ring

Configure

62 Part Numbers

View Part Numbers

Configure Remaining Specifications

Completed

Specification/Dimensions

Nominal
10

11

12

13

14

15

16

17

19

20

21

22

24

25

26

28

30

32

35

37

40

42

45

47

52

55

60

62

68

72

80
Clear
Material
Steel

Stainless Steel
Clear
Shaft or Hole Used d1 (Reference)(mm)
10

11

12

13

14

15

16

17

19

20

21

22

24

25

26

28

30

32

35

37

40

42

45

47

52

55

60

62

68

72

80
Clear
Applicable Shaft or Hole d2 (Reference)(mm)
10.4

11.4

12.5

13.6

14.6

15.7

16.8

17.8

20

21

22

23

25.2

26.2

27.2

29.4

31.4

33.7

37

39

42.5

44.5

47.5

49.5

55

58

63

65

71

75

83.5
Clear
Shaft / Shaft Bore / Groove Nominal (Reference)(mm)
10

11

12

13

14

15

16

17

19

20

21

22

24

25

26

28

30

32

35

37

40

42

45

47

52

55

60

62

68

72

80
Clear
type
- RTWN
- RTWS
Clear
CAD
- 2D
- 3D
Clear

Days to Ship

All

1 Day(s) or Less

2 Day(s) or Less

4 Day(s) or Less

6 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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Retaining Rings/Internal/C-Type (Part Numbers)

(i)Caution

Specifications

Part Number

Basic Information

Configure

Specification/Dimensions

Nominal

Material

Shaft or Hole Used d1 (Reference)(mm)

Applicable Shaft or Hole d2 (Reference)(mm)

Shaft / Shaft Bore / Groove Nominal (Reference)(mm)

type

CAD

Days to Ship

Specify Alterations

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