Rubber damper / rubber damper with counterbore / dimension L freely selectable (RBZAK25-20-M8)

Promotional pricing ends 30/11/2024
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MISUMI

Product Details:

Manufacturer part number: RBZAK25-20-M8

Brand: MISUMI

Price: 15.31 €

Delivery time: 7 Days

Technical Data:

Detailed Material: Silicon Rubber (SI)

Hardness (shore, asker): Shore A50

O.D. D: 25 Ø

Length L: 20 mm

Color: Milky White

Order quantities extended (D-JIT)

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RBZAK25-20-M8

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Technical Information

Back to the Category Discs/Sleeves (Rubber, Caoutchouc, Foam, Felt)

Technical Drawing - Polyurethane Rubber Washers

Rubber Bumpers/Counterbored Rubber Bumpers/L Dimension Selectable:Related Image

Open the technical drawing in the new window

Available dimensions and tolerances can be found under the tab More information.

Basic Properties (e.g., material, hardness, coating, tolerance) - Polyurethane Rubber Washers

Rubber Only	With Collar			Material	Hardness	Color
Rubber Only	Black Oxide	Electroless Nickel Plating	EN 1.4301 Equiv.	Material	Hardness	Color
RBZNK	RBZNK-C	RBZNK-M	RBZNK-S	Nitrile Rubber (NBR)	Shore A70	Black
RBZCK	RBZCK-C	RBZCK-M	RBZCK-S	Chloroprene Rubber (CR)	Shore A65	Black
RBZUK	RBZUK-C	RBZUK-M	RBZUK-S	Low Elasticity Rubber (HANENITE®GP-35LE)	Shore A35	Black
RBZSK	RBZSK-C	RBZSK-M	RBZSK-S	Silicon Rubber (SI)	Shore A70	Light Gray
RBZAK	RBZAK-C	RBZAK-M	RBZAK-S	Silicon Rubber (SI)	Shore A50	Milky White
RBZFK	RBZFK-C	RBZFK-M	RBZFK-S	Fluororubber (FPM)	Shore A80	Black

The milky white color of silicone rubber shore A 50 is translucent.

Further specifications can be found under the tab More information.

Composition of a Product Code - Polyurethane Rubber Washers

Part Number	-	L	-	M
RBZCK25	-	20	-	M6

General Information - Polyurethane Rubber Washers

Rubber washer - rubber sleeve with counterbore - rubber sleeve - rounded rubber damper - foam washer - foam sleeve

Selection details of rubber discs/rubber sleeves

- Material: heat-resistant antistatic, abrasion-resistant, highly abrasion-resistant, low-impact polyurethane rubber (PU/PUR), Vulkollan, ceramic polyurethane rubber, nitrile rubber sponge (NBR), chloroprene rubber (CR), ethylene cautchouc (EPDM), silicone rubber (SI), fluoro-cautchouk (FPM), hard rubber, butyl rubber (IIR), natural rubber, nitrile rubber foam, chloroprene rubber foam, polyethylene foam (EPDM foam), EPT sealing material, Silicone rubber foam, fluoro-rubber foam, special polyurethane foam (SOFRAS), polyester felt, polyester felt

- Hardness: Asker C5 to C35, Asker F75 to F85, Shore A15 to A95

- Versions: disc with bore holes, sleeves with holes, sleeves without holes, sleeves with counterbores, sleeves with external threads, sleeves with collar, dampers with round tip, dampers with conical tip

- Inner diameter: up to 80 mm

- Outer diameter: 6 to 100 mm

- Length: 1 to 10 mm (discs), 10 to 500 mm (sleeves)

Description/Basics

Rubber discs and rubber sleeves, also called rubber buffers, are generally used for vibration damping and impact damping. Rubber sleeves are often used as stopper buffers in industry. Rubber discs are occasionally also used as seals.
Discs and sleeves made of natural rubber are offered in different materials and hardnesses.

While rubber discs are often used for sealing, rubber sleeves are increasingly used as rubber buffers, stopper buffers, or elastomer dampers. MISUMI already offers such a rubber sleeve as a rubber buffer with external thread or counterbore for fastening.
The rubber buffer is also available with a vulcanized metal collar, which not only allows for a firm assembly, but also sits in the anti-backlash rubber sleeve. These adhesives are also available separately. In addition to the material of the rubber buffer, the shape of the stopper buffer is also responsible for the damping characteristic. conical or rounded rubber buffers can also develop a progressive damping curve that generates increasing damping.

Depending on the application and environmental influences, MISUMI offers rubber discs and rubber sleeves in various basic materials with the appropriate resistance. An overview of the intended uses of the respective natural rubber can be found under Natural Rubber Properties as PDF .
The rubber buffers made of polyurethane rubber are also available in an antistatic version. The specific resistance of antistatic rubber discs and rubber sleeves prevents static charging. This can prevent damage to electronic components.
For high temperature applications, MISUMI offers heat-resistant polyurethane rubber, which can withstand temperatures of approx. +120°C (see Specifications for further information).
Vulkollan, on the other hand, is a very abrasion-resistant polyurethane, the abrasion resistance of which is six times higher compared to conventional polyurethane.
Ceramic polyurethane washers and sleeves contain ceramic particles. Despite a low Shore hardness, they can be machined to give them a smooth surface.
MISUMI also offers foam discs and foam sleeves. In addition to damping, these can also have sealing properties. This is achieved by the foam discs due to the closed or semi-closed pores (EPT sealer) inside the material. For semi-closed pores, the pores are sealed under load. Therefore, the type of pores must always be observed for foams in order to select the appropriate foam depending on the application. You can get help for your selection by following this link.
Further properties of natural rubbers and foams can be found in the Properties PDF.
In addition to the aforementioned basic materials, the MISUMI online shop also offers felt discs and felt sleeves. Felt has the properties of capillary action and can absorb and release liquids such as oil. In addition, felt is gentle on sensitive surfaces and is often used for polishing surfaces.

A antivibration materials can also be used for two-sided mounting to dampen vibration.
MISUMI also offers vibration damping and impact damping materials in the form of sheets.

Application Examples - Polyurethane Rubber Washers

Application example - rubber roller with rubber sleeve - rubber roller with roller bearing - roller bearing with axle - running wire

Application example: rubber roller
(1) Rubber sleeve, (2) Roller bearing, (3) Axles / Rotary Shafts, (4) Catch ropes

Application example - cylinder stopper buffer - cylinder end stop - rubber buffer - rubber buffer for cylinder -

Application example: cylinder stopper buffer
(1) Rubber washer, (2) Floating joints, (3) Pneumatic cylinder

Industrial Applications

3D printer industry

Automotive industry

Pharmaceutical industry

Packaging industry

Part Number:

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Part Number
RBZAK25-20-M8

Part Number	Standard Unit Price	Minimum order quantity	Volume Discount	Standard Shipping Days ?	RoHS	Detailed Material	Hardness (shore, asker)	O.D. D (Ø)	Length L (mm)	Color	Applicable Screw Size [M]
	15.31 €	1	Available	7 Days	10	Silicon Rubber (SI)	Shore A50	25	20	Milky White	M8

Back to the Category Disks/Sleeves (Rubber, Caoutchouc, Foam, Felt)

Technical Drawing - Polyurethane Rubber Washers

Open the technical drawing in the new window

Specification Tables - Polyurethane Rubber Washers

Hole Diameter of Applicable Screw

Screw Size	Rubber Only		With Collar
Screw Size	d₁	d₂	d₃	d₄	d₅	T
M3	6	4	8	5.5	3.5	2
M4	8	5	9.5	6.5	4.5
M5	9.5	6	11	8	5.5
M6	11	7	13	9	6.6
M8	14	9	15.5	11.5	9
M10	18	11	19	14	11	3
M12	20	14	22	17	14	3

D Tolerance

D	Tolerance
40 or Less	±0.5
50, 60	±0.7

d₂, d₄, H₁, d₁ and d₃ Tolerance

Dimension	Tolerance
Dimension	d₂, d₄	H₁	d₁, d₃
30 or Less	±0.5	±0.5	±0.5

Part Number		L Selection							(M) Applicable Screw	Rubber Only H₁	With Collar		Rubber Only Unit Price				Collar Type Unit Price
											H₂	Applicable Collar No.	RBZNK RBZCK	RBZUK	RBZSK RBZAK	RBZFK	Black Oxide RBZ_K-C	Electroless Nickel Plating RBZ_K-M	EN 1.4301 Equiv. RBZ_K-S
Type	D
Rubber Only RBZNK (Nitrile Rubber, Shore A70) RBZCK (Chloroprene Rubber, Shore A65) RBZUK (Low Elasticity Rubber, Shore A35) RBZSK (Silicon Rubber, Shore A70) RBZAK (Silicon Rubber, Shore A50) RBZFK (Fluororubber, Shore A80) With Collar Rubber Selection - Collar Spec. Selection RBZ□K-C (Black Oxide) RBZ□K-M (Electroless Nickel Plating) RBZ□K-S (EN 1.4301 Equiv.)	12	12							M3	5	-						-	-	-
	15	12	15								5	3
			15	20					M4			4
	20			20	25					7	7	4A
				20	25				M5			5
	25			20	25				M6	8	8	6
				20	25				M8			8
	30			20	25	30			M6	10	8	6
					25	30	40		M8			8
	40					30	40		M10	12	10	10
						30	40	50	M12			12
	50					30	40		M10	15		10
							40	50	M12			12
	60					30	40		M10			10
							40	50	M12			12
D12 is not available for Collar Type. L≤30 for Low Elasticity Rubber (RBZUK) and Fluororubber (RBZFK). For applicable collar dimensions, see Collars for Counterbored Urethane and Rubber Bumpers.

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Basic information

Shape	Counterbored	Material	Rubber

This page is Rubber damper / rubber damper with counterbore / dimension L freely selectable, part number RBZAK25-20-M8.
You can find the detail information about specifications and dimensions on part number RBZAK25-20-M8.

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Basic Attributes

Type
- RBZAK
- RBZAK-C
- RBZAK-M
- RBZAK-S
- RBZCK
- RBZCK-C
- RBZCK-M
- RBZCK-S
- RBZFK
- RBZFK-C
- RBZFK-M
- RBZFK-S
- RBZNK
- RBZNK-C
- RBZNK-M
- RBZNK-S
- RBZSK
- RBZSK-C
- RBZSK-M
- RBZSK-S
- RBZUK
- RBZUK-C
- RBZUK-M
- RBZUK-S
Clear
Detailed Material
- Nitrile Rubber (NBR Nitrile Rubber )
- Chloroprene Rubber (CR)
- Silicon Rubber (SI)
- Fluoro Rubber (FPM)
- Low Elasticity Rubber
  - Low Elasticity Rubber (HANENITE®GP-35LE)
Clear
Hardness (shore, asker)
Shore A50

Shore A65

Shore A70

Shore A80

Shore A35
Clear
O.D. D(Ø)
12

15

20

25

30

40

50

60
Clear
Length L(mm)
12

15

20

25

30

40

50
Clear
Color
- Black
- Light Gray
- Milky White
Clear
Applicable Screw Size [M]
M3

M4

M5

M6

M8

M10

M12
Clear
Filter by CAD data type
- 2D
- 3D
Clear

Optional Attributes

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

Frequently Asked Questions (FAQ)

Question:
What is Vulkollan?: Answer:
Vulkollan is a highly abrasion-resistant polyurethane rubber that has high wear resistance. It is one of the high-performance rubbers that has little pressure deformation and can withstand high impact forces. In addition, Vulkollan has a high tear strength. However, over time Vulkollan may change its colour, but without losing its mechanical properties.
Question:
Which rubber is resistant?: Answer:
Vulkollan is an abrasion-resistant material. It has an approx. six-fold higher abrasion resistance than conventional polyurethane materials. Vulkollan is particularly suitable for applications where high abrasion is expected.
Question:
Which rubber washer is oil-resistant?: Answer:
A rubber disc made of nitrile rubber (NBR) is highly resistant to various oils. This material is often used as a seal due to its good heat resistance and abrasion resistance.
Question:
Can a rubber sleeve be glued?: Answer:
A rubber sleeve or rubber disc can be stuck in or glued in. However, it must be ensured that the correct adhesive is selected in relation to the material of the elastomer. If this is not taken into account, the adhesive does not have the desired effect or even attack and degrade the elastomer. In addition, the adhesive should support the respective property of the material, e.g., antistatic or temperature resistance.

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Variation of this product

Part Number
RBZAK-C15-20-M4
RBZAK-C20-20-M4
RBZAK-C20-20-M5
RBZAK25-25-M6
RBZAK25-25-M8
RBZAK30-20-M6

Standard Unit Price	Minimum order quantity	Volume Discount	Standard Shipping Days ?	RoHS	Detailed Material	Hardness (shore, asker)	O.D. D (Ø)	Length L (mm)	Color	Applicable Screw Size [M]
13.49 €	1	Available	7 Days	10	Silicon Rubber (SI)	Shore A50	15	20	Milky White	M4
15.03 €	1	Available	7 Days	10	Silicon Rubber (SI)	Shore A50	20	20	Milky White	M4
15.03 €	1	Available	7 Days	10	Silicon Rubber (SI)	Shore A50	20	20	Milky White	M5
15.31 €	1	Available	7 Days	10	Silicon Rubber (SI)	Shore A50	25	25	Milky White	M6
15.31 €	1	Available	7 Days	10	Silicon Rubber (SI)	Shore A50	25	25	Milky White	M8
16.28 €	1	Available	7 Days	10	Silicon Rubber (SI)	Shore A50	30	20	Milky White	M6