Metal Washers Counterbored Hole

MISUMI

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 Grade

T Dimension Tolerance±0.1

Precision Grade

Dimension Tolerance±0.01

Material

Surface Treatment

Hardness

D (mm)

V (mm)

P(mm)

H(mm)

T(mm)

T Dimension Selectable

T Dimension Configurable

Custom dimensions

T Dimension Configurable

Custom dimensions

E-FWZASS

SS400

10~100

5~90

3~88

1~48

3~50

E-FWZAC

E-FWZSC

General structural steel or carbon steel

E-WZAB

E-TWZAB

E-FWZAB

E-TWZSB

E-FWZSB

Ferroferric Oxide Protective Film

E-WZAM

E-TWZAM

E-FWZAM

E-TWZSM

E-FWZSM

Electroless Nickel Plating

E-FWZAA

Aluminum Alloy

Clear Anodized

E-FWZAAB

Black Anodized

E-WZAS

E-TWZAS

E-FWZAS

E-TWZSS

E-FWZSS

Austenitic stainless steel

E-FWZACH

General structural steel or carbon steel

45～50HRC

E-WZABH

E-FWZABH

Ferroferric Oxide Protective Film

E-WZAMH

E-FWZAMH

Electroless Nickel Plating

E-FWZASK

Alloy tool steel or bearing steel

55HRC～

E-FWZASKB

Ferroferric Oxide Protective Film

E-FWZASKM

Electroless Nickel Plating

E-WZASH

E-FWZASH

Martensitic stainless steel

45～50HRC

Specification Table

Part Number

0.5mm increments

－Standard Grade－
E-FWZASS
E-FWZAC
E-FWZAB
E-FWZAM
E-FWZAA
E-FWZAAB
E-FWZAS

E-FWZACH
E-FWZABH
E-FWZAMH
E-FWZASK
E-FWZASKB
E-FWZASKM
E-FWZASH

10.0～20.0
(0.5mm increments)

5.0~90.0

3.0~88.0

1.0~48.0

3.0~10.0

10.5~20.0

20.5~30.0

30.5~40.0

40.5~50.0

21～30
(1mm increments)

3.0~10.0

10.5~20.0

20.5~30.0

30.5~40.0

40.5~50.0

31～40
(1mm increments)

3.0~10.0

10.5~20.0

20.5~30.0

30.5~40.0

40.5~50.0

41～50
(1mm increments)

3.0~10.0

10.5~20.0

20.5~30.0

30.5~40.0

40.5~50.0

51～60
(1mm increments)

3.0~10.0

10.5~20.0

20.5~30.0

30.5~40.0

40.5~50.0

61～80
(1mm increments)

5.0~10.0

10.5~20.0

20.5~30.0

30.5~40.0

40.5~50.0

81～100
(1mm increments)

5.0~10.0

10.5~20.0

20.5~30.0

30.5~40.0

40.5~50.0

Machining Conditions

D	V	P
For 10-60	V≤D－2	P ≤ V － 2
For 61-100	V≤D－4	P ≤ V － 4

Machining Conditions of SKS3 Material

D	V	P
For 10	V≤D－2	P ≤ V － 2
For 10.5-30	V≤D－4
For 31-60	V≤D－6
For 61-80	V≤D－8	P ≤ V － 4
For 81-100	V≤D－10	P ≤ V － 4

2≤(T-H)≤P×8 The shaft diameter is 2mm or more and P×8 or less.

■Custom Dimensions-Precision Grade

Part Number

0.5mm increments

－Precision Grade－
E-FWZSC
E-FWZSB
E-FWZSM
*E-FWZSS

10.0～20.0
(0.5mm increments)

5.0~58.0

3.0~56.0

1.0~48.0

3.0~10.0

10.5~20.0

20.5~30.0

30.5~40.0

40.5~50.0

21～30
(1mm increments)

3.0~10.0

10.5~20.0

20.5~30.0

30.5~40.0

40.5~50.0

31～40
(1mm increments)

3.0~10.0

10.5~20.0

20.5~30.0

30.5~40.0

40.5~50.0

41～50
(1mm increments)

3.0~10.0

10.5~20.0

20.5~30.0

30.5~40.0

40.5~50.0

51～60
(1mm increments)

3.0~10.0

10.5~20.0

20.5~30.0

30.5~40.0

40.5~50.0

Machining Conditions of Austenitic Stainless Steel T≥3.5

D	V	P
For 10-60	V≤D－2	P ≤ V － 2
For 61-100	V≤D－4	P ≤ V － 4

2≤(T-H)≤P×8 The shaft diameter is 2mm or more and P×8 or less.

■T dimension selectable

Part Number		H	T Selection						V	P
Type	D	H	T Selection						V	P
E-WZAB E-WZAM E-WZAS E-WZABH E-WZAMH E-ＷZASH	10	4	6	8	10				6	3.5
	12	5		8	10				8	4.5
	14	6		8	10				10	5.5
	15	8			10	12			11	6.5
	20	8			10	12	15		11	6.5
	30	10				12	15		14	9
	40	12					15	20	18	11
	50	12					15	20
	60	12					15	20

■T dimension configurable

Part Number		H 0.5mm increments	T 0.5mm increments	V	P
Type	D
-Standard Grade- E-TWZAB E-TWZAM E-TWZAS -Precision Grade- E-TWZSB E-TWZSM E-TWZSS	10	1.0~18.0	3.0~10.0	6	3.5
			10.5~20.0
	12		3.0~10.0	8	4.5
			10.5~20.0
	14		3.0~10.0	10	5.5
			10.5~20.0
	15		3.0~10.0	11	6.5
			10.5~20.0
	20		3.0~10.0
			10.5~20.0
	30		3.0~10.0	14	9
			10.5~20.0
			Machining Conditions H+2≤T≤P×8

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

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