[Announcement] MISUMI Malaysia website new user interface. Clearer navigation, easy product search and more. Explore now! May contact us at (60) 3 7890 6399 for any inquiries.

How can we improve?

How can we improve?

Comments

Name (Optional)

E-mail Address (Optional)

Tel (Optional)

While we are not able to respond directly to comments submitted in this form, the information will be reviewed for future improvement.
Customer Privacy Policy

Thank you for your cooperation.

While we are not able to respond directly to comments submitted in this form, the information will be reviewed for future improvement.
Please use the inquiry form.

Customer Privacy Policy

Metal Washers For Flat Head Bolt

MISUMI

MiSUMi Economy

MISUMI

RoHS

Part Number

Configured Part Number is shown.

Drawing/Specifications
3D Preview
Part Numbers

Product Overview

It is generally used as a component that is cushioned at the workpiece connector and plays a role of precise adjustment of the clearance on the cushioned part.
It can also be used to protect the surface of the connected part from being scratched by the nut and disperse the pressure generated by the nut on the connected part.

Dimensional Drawing

MISUMI Metal Washers For Flat Head Bolt Drawings, Gasket Specifications

Specifications Overview

・Material Table

Standard	Configurable Counterbored	Material	Surface Treatment	D (mm)	V (mm)	E(mm)	T(mm)
-	E-FWSRC	General structural steel or carbon steel	-	10~60	2~30	2~10	2~10
E-WSRB	E-FWSRB		Ferroferric Oxide Protective Film
E-WSRM	E-FWSRM		Electroless Nickel Plating
-	E-FWSRA	Aluminum Alloy	Clear Anodized
E-WSRS	E-FWSRS	Austenitic stainless steel	-

If there are requirements for product hardness, refer to

Metal Washer Hardened Products.

Specification Table

■Standard Type for Flat Head Bolt

Part Number		T Selection	E	V
Type	D
E-WSRB E-WSRM	25	5	5	9
		6
	30	6	6	11
		8

■Custom Dimensions Type for Flat Head Bolt

Part Number	D	V 0.5mm increments (V3 or more)	E 0.5mm increments	Ｔ 0.5mm increments
E-FWSRC E-FWSRB E-FWSRM E-FWSRA E-FWSRS	10.0～20.0 (0.5mm increments)	2.0 2.6 3～30	2.0～10.0 E≤T	2.0~5.0
				5.5~10.0
	21～30 (1mm increments)			2.0~5.0
				5.5~10.0
	31～40 (1mm increments)			2.0~5.0
				5.5~10.0
	41～50 (1mm increments)			2.0~5.0
				5.5~10.0
	51～60 (1mm increments)			2.0~5.0
				5.5~10.0
(D-V)/2-E≥1->Minimum wall thickness must be more than 1mm.
When E=T, V thickness is 0, so the roundness cannot be guaranteed.

Product Features

Feature 1: There is a wide range of options for inner and outer diameters and thickness, and for the T dimension configurable type, the thickness can be specified in 0.5mm increments.
Feature 2: High-precision products made by cutting and machining can realize high-precision spatial adjustment.
Feature 3: Compared with standard washers, metal washers will not be dented after the connected part is screwed in due to the locking, and cause the bolts to loosen.
Feature 4: Compared with standard stamped washers, metal washers increase the friction with the mounting part, which can prevent loosening.

Usage Method

Example of use for securing the seat surface
■The bolt connection is stable.


Example of use for anti-loosening			Example of use for reinforcement of soft materials
■ By increasing the seat surface to increase friction, it is not prone to loosening.			■ Prevent the bolts from sinking in.


Example of use as spring washer

Precautions

①When D=16 or less, chamfer C is 0.2 or less.
When D=20 or more, chamfer C is 0.5 or less.
②Metal washer is a turned product, not a stamped part.
③When the relative humidity of the operating environment is high and certain anti-rust ability is required, please choose products with electroless nickel plating surface treatment or stainless steel SUS3 series materials.
④When the operating environment requires certain abrasion resistance and hardness for metal washers, please give priority to metal washer quenched products.

Example of Use

Application Industries

Smart Phones	Electronic & Electrical	Lithium battery

Automotive	Robotics	Medical

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; 45; 60

Part Number
E-WSRB25-[5,6]
E-WSRB30-[6,7,8]
E-WSRB40-10
E-WSRB50-10
E-WSRM25-[5,6]
E-WSRM30-[6,7,8]
E-WSRM40-10
E-WSRM50-10
E-WSRS30-[6,7,8]
E-WSRS40-10
E-WSRS50-10

Standard Unit Price	Minimum order quantity	Days to Ship	O.D. (mm)	I.D. (mm)	Material	Surface Treatment	Countersunk Hole Depth E (Ø)	Size Specified Method	Thickness T (mm)	I.D. V (φ)	O.D. D (φ)	Tapered Hole Depth E (mm)
-	1 Piece(s)	7 Day(s)	25	9	[Steel] General Structural Steel or Carbon Steel	Black Oxide	5	Dimension selectable	5 ～ 6	-	-	-
-	1 Piece(s)	7 Day(s)	30	11	[Steel] General Structural Steel or Carbon Steel	Black Oxide	6	Dimension selectable	6 ～ 8	-	-	-
-	1 Piece(s)	7 Day(s)	40	11	[Steel] General Structural Steel or Carbon Steel	Black Oxide	6	Dimension selectable	10	-	-	-
-	1 Piece(s)	7 Day(s)	50	11	[Steel] General Structural Steel or Carbon Steel	Black Oxide	6	Dimension selectable	10	-	-	-
-	1 Piece(s)	7 Day(s)	25	9	[Steel] General Structural Steel or Carbon Steel	Electroless Nickel Plating	5	Dimension selectable	5 ～ 6	-	-	-
-	1 Piece(s)	7 Day(s)	30	11	[Steel] General Structural Steel or Carbon Steel	Electroless Nickel Plating	6	Dimension selectable	6 ～ 8	-	-	-
-	1 Piece(s)	7 Day(s)	40	11	[Steel] General Structural Steel or Carbon Steel	Electroless Nickel Plating	6	Dimension selectable	10	-	-	-
-	1 Piece(s)	7 Day(s)	50	11	[Steel] General Structural Steel or Carbon Steel	Electroless Nickel Plating	6	Dimension selectable	10	-	-	-
-	1 Piece(s)	7 Day(s)	30	11	[Stainless Steel] SUS304 Equivalent	Not Provided	6	Dimension selectable	6 ～ 8	-	-	-
-	1 Piece(s)	7 Day(s)	40	11	[Stainless Steel] SUS304 Equivalent	Not Provided	6	Dimension selectable	10	-	-	-
-	1 Piece(s)	7 Day(s)	50	11	[Stainless Steel] SUS304 Equivalent	Not Provided	6	Dimension selectable	10	-	-	-

Basic Information

I.D. Shape	Flat Head Screw	I.D. Tolerance	+0.3~+0.1	Thickness / Length Tolerance	±0.1
O.D. Tolerance	0~-0.2	Unit of Purchase	Single Item	Hardness(HRC)	Without Quenching
Accuracy	Normal

Configure

11 Part Numbers

View Part Numbers

Configure Remaining Specifications

Completed

Specification/Dimensions

O.D.(mm)
25

30

40

50
Clear
I.D.(mm)
9

11
Clear
Material
- Steel
  - General Structural Steel or Carbon Steel
- Stainless Steel
  - SUS304 Equivalent
- Aluminum
  - Aluminum Alloy
Clear
Surface Treatment
- Not Provided
- Black Oxide
- Electroless Nickel Plating
- Anodize (Clear)
Clear
Countersunk Hole Depth E(Ø)
- 5
- 6
Clear
Size Specified Method
Custom dimensions

Dimension selectable
Clear
Thickness T(mm)
5

6

7

8

10
Clear
I.D. V(φ)
2

2.6
Clear
O.D. D(φ)
Clear
Tapered Hole Depth E(mm)
Clear
type
- E-FWSRA
- E-FWSRB
- E-FWSRC
- E-FWSRM
- E-FWSRS
- E-WSRB
- E-WSRM
- E-WSRS
Clear
CAD
- 2D
- 3D
Clear

Days to Ship

All

7 Day(s) or Less

9 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 .

Additional Products in this Category

Tech Support

: Technical Inquiry

Ultra short head hex socket bolt	Adjustment Screw Components Hex Head Stud	Axle Pin Bolt

Representative model: CBSA6-12	Representative model: ANH4-20	Representative model: DBTS6-3-10
Advantages: space saving, sufficient stock	Advantages: Front end hardened, optional length	Advantages: Accurate positioning, high shaft precision

Examples of using metal washer/collars		ClickExamples of using metal washer/collars
Anti-rust performance and maintenance of metal materials and surface treatment		ClickAnti-rust performance and maintenance of metal materials and surface treatment

How can we improve?

Metal Washers For Flat Head Bolt

Part Number

Basic Information

Configure

Specification/Dimensions

O.D.(mm)

I.D.(mm)

Material

Surface Treatment

Countersunk Hole Depth E(Ø)

Size Specified Method

Thickness T(mm)

I.D. V(φ)

O.D. D(φ)

Tapered Hole Depth E(mm)

type

CAD

Days to Ship

Specify Alterations

Additional Products in this Category

Tech Support

Payment Method

About MISUMI

About this Website

Useful Tools

Customer Service

Social Media

MISUMI Contact 9am – 6pm (Mon – Fri) * Order cut-off time is 5pm, 9am – 1pm(Sat) * Order cut-off time is 12pm