Counterbored Urethane Bumpers, With Collar/ Without Collar

Brand :

MISUMI

Caution

Product Description

This is an economy item, The price is cheaper than the MISUMI standard product.

Product Overview

Polyurethane shock-absorbing material is effective in preventing workpiece scratches and cracking during fastening, as well as providing cushioning and vibration reduction for impact parts and vibration prevention.
Polyurethane is one of the more wear-resistant materials among non-metallic materials.

Dimensional Drawing

■ Shaftless Type (Polyurethane Only)
Polyurethane Bearing is a non-metallic elastomer

■ With Collar Type
Detailed Specifications and Dimensions with Shaft Collar URETHANE BUMPERS COUNTER BORED

H1·H2 Tolerance		D tolerance
H1·H2	Tolerance	D	Tolerance
30 or Less	±0.3	40 or Less	±0.3
31 or more	±0.6	50	±0.4
		60	±0.4
		80	±0.5
		100	±0.5

Due to the tolerances of the polyurethane and the shaft collar, the L dimension of the shaft collar may protrude slightly, which is normal.

If you mind this situation, please choose Polyurethane Shock Absorbing Material Hot Bonding/Shaft Ring Hot Bonding Type Products

MISUMI Polyurethane Shock Absorbing Material Applicable Shaft Collar Detailed Size Table

Collar No.	d	D	H	T	L	h
3	3.5	5.5	5	2	7	7.5
4	4.5	6.5	5		7	8.5
4A	4.5	6.5	7		9	8.5
5	5.5	8	7		9	10
6	6.6	9	8		10	12
8	9	11.5	8		10	14.5
8A	9	11.5	6		8	14.5
10	11	14	10	3	13	17
12	14	17	10	3	13	20
16	18	22	15	4	19	26

The corresponding hole sizes for applicable bolts are as follows

Bolt Dimension	Urethane only		With Collar
Bolt Dimension	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
M16	26	18	28	22	18	4

Material Specifications

Part Number	Shaftless Type (Polyurethane Only)	With Collar Type			Material	Hardness	Color
Part Number	Shaftless Type (Polyurethane Only)	Black Oxide	Electroless Nickel Plating	Austenitic Stainless Steel	Material	Hardness	Color
L dimension fixed type	E-AZXSK	E-AZXSC	E-AZXSM	E-AZXSS	Standard urethane (ether type urethane)	Shore A95	Natural
	E-AZXHK	E-AZXHC	E-AZXHM	E-AZXHS	Standard urethane (ether type urethane)	Shore A90
	E-AZXMK	E-AZXMC	E-AZXMM	E-AZXMS	Standard Polyurethane (Ester-based Polyurethane)	Shore A70
	E-AZXLK	E-AZXLC	E-AZXLM	E-AZXLS	Standard Polyurethane (Ester-based Polyurethane)	Shore A50
	E-AZEXHK	E-AZEXHC	-	-	Wear-resistant urethane	Shore A90	Dark Brown
	E-AZEXMK	E-AZEXMC	-	-	Wear-resistant urethane	Shore A70	Dark Brown
	E-AZXHHK	E-AZXHHC	-	-	Heat-resistant urethane	Shore A90	Brown
L dimension configurable	E-AZXS	E-AZCS	E-AZCS-M	E-AZCS-S	Standard urethane (ether type urethane)	Shore A95	Natural
	E-AZXH	E-AZCH	E-AZCH-M	E-AZCH-S	Standard urethane (ether type urethane)	Shore A90
	E-AZXM	E-AZCM	E-AZCM-M	E-AZCM-S	Standard Polyurethane (Ester-based Polyurethane)	Shore A70
	E-AZXL	E-AZCL	E-AZCL-M	E-AZCL-S	Standard Polyurethane (Ester-based Polyurethane)	Shore A50

Material color is subject to the actual product. Polyurethane will yellow over time, but its properties will not change.

For details on various polyurethane characteristics, please click

Characteristics of Polyurethane, Rubber, and Sponge.

Orders for only the shaft collar are also accepted.
■ Polyurethane Shock Absorbing Material Color Chart

Natural	Black	Brown		Dark Brown

Polyurethane is subject to color variation; the above colors are for reference only.

Specification Table

Part Number						L Selection							M	Polyurethane only H₁	With Collar
Type					D	L Selection							M	Polyurethane only H₁	H₂	Shaft Collar No.
L Dimension Fixed					12	12							M3	5	-
					15	12	15						M3		5	3
No Collar	With Collar				15	15	20						M4		5	4
Urethane only	Black Oxide	Electroless Nickel Plating	SUS304		20			20	25				M4	7	7	4A
Urethane only	Black Oxide	Electroless Nickel Plating	SUS304		20			20	25				M5	7	7	5
E-AZXSK	E-AZXSC	E-AZXSM	E-AZXSS	(Standard Shore A95)	25			20	25				M6	8	8	6
E-AZXHK	E-AZXHC	E-AZXHM	E-AZXHS	(Standard Shore A90)	25			20	25				M8	8	6	8A
E-AZXMK	E-AZXMC	E-AZXMM	E-AZXMS	(Standard Shore A70)	30			20	25	30			M6	10	8	6
E-AZXLK	E-AZXLC	E-AZXLM	E-AZXLS	(Standard Shore A50)	30				25	30	40		M8	10	8	8
E-AZEXHK	E-AZEXHC			(Wear-resistant Type Shore A90)	40					30	40		M10	12	10	10
E-AZEXMK	E-AZEXMC			(Wear-resistant Type Shore A70)	40					30	40	50	M12	12		12
E-AZXHHK	E-AZXHHC			(Wear-resistant Type Shore A90)	50					30	40		M10	15		10
					50						40	50	M12			12
					60					30	40		M10			10
					60						40	50	M12			12
L dimension configurable					15	15 to 50(Polyurethane only) 25 to 50(With shaft collar)							M3 M4	5 ≤ H₁<L	5(M3)7(M4)	-
No Collar	With Collar				20								M4 M5		7 (M4 M5)
Urethane only	Black Oxide	Electroless Nickel Plating	SUS304		25								M6 M8		8 (M6 M8)
Urethane only	Black Oxide	Electroless Nickel Plating	SUS304		30								M6 M8		8 (M6 M8)
E-AZXS	E-AZCS	E-AZCS-M	E-AZCS-S	(Standard Shore A95)	40	25 to 50(Polyurethane only) 30 to 50(With collar)							M10 M12		10 (M10 M12)
E-AZXH	E-AZCH	E-AZCH-M	E-AZCH-S	(Standard Shore A90)	50
E-AZXM	E-AZCM	E-AZCM-M	E-AZCM-S	(Standard Shore A70)	60

Product Features

Feature 1: Compared to rubber, polyurethane offers a wider range of hardness options, is softer and more elastic, and also has a certain degree of airtightness.
Feature 2: Urethane has excellent mechanical strength and is more widely used to prevent scars and cracks when brittle objects such as glass and acrylic are fastened.
Feature 3: Urethane is less likely to transmit vibration and sound.
Feature 4: Polyurethane has low dust generation, and since it does not contain carbon, it is a material that is not prone to color transfer. (*Natural color only)
Feature 5: A wide variety of products are available to suit different operating conditions.
For more product details, please click

Characteristics of Polyurethane, Rubber, and Sponge.
Feature 6: Available with or without shaft collar, offering multiple options to meet your needs.
■ Hardness Table

Material	A95	A90	A70	A50	A30
Urethane	●	●	●	●	●
Nitrile Rubber	×	×	●	●	×
Chloroprene	×	×	●	×	×
EPDM Rubber	×	×	●	×	×
Silicone Rubber	×	×	●	●	×
Fluororubber	×	×	●	×	×
Butyl Rubber	×	×	●	×	×

Precautions

(1) About urethane discoloring
Urethane will darken its color by absorbing UV rays or illuminating light. This phenomenon is called yellowing. But it does not affect its physical properties, please fully understand when using it.

New urethane	Yellowed urethane

②Hydrolysis characteristics of urethane
If urethane is used for a long time in a moist or humid environment, it will be hydrolyzed and deteriorated.
It is recommended to manage the temperature and humidity of the warehouse and operating environment in areas with high humidity to extend the service life of the product.

(3) Changes in the state of the product after hydrolysis
· The polyurethane surface becomes sticky
· Pressing lightly with a fingernail leaves irreversible marks
· Polyurethane hardness decreases
· Polyurethane dries and cracks, easily disintegrating into powder

Hydrolyzed urethane

Polyurethane Hydrolysis Characteristics Chart

④Urethane dimension change
Urethane dimension will change with the surrounding temperature, but the amount of change is not large, and it can be restored to its original dimension after a few hours at room temperature.

Example of Use

Example of Use①	Role of Product
■ Positioning Mechanism	This can prevent direct contact between metal parts, and also provides shock absorption, cushioning, and noise reduction effects.

Example of Use②	Role of Product
■ Feeding Equipment	Fits over protruding parts of equipment to prevent injury. Can also be used as a stopper to support the panel when it is flipped up.

Example of Use③	Role of Product
■ Wire Conveyance Mechanism	Utilizes the wear resistance of polyurethane Can be used as a wire guide.

Related Industries

Electronic		Automotive

Smart phone		Semiconductor

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