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ASME/ANSI B18.21.1:2009 Type A Flat Washer

ASME/ANSI B18.21.1:2009 Type A Flat Washer is used for bearing support and surface protection in inch-series fastening systems. The Type A form is suitable for general mechanical connections and provides a stable circular bearing surface under a bolt head or nut.

It is commonly found in equipment manufacturing, maintenance assembly, auxiliary steel fixing, and export supply projects. Its dimensional system matches ASME/ANSI fasteners, making standardized sourcing and replacement easier in inch-based connections.

Material, hardness, and surface treatment can be chosen according to load, base material, and environmental conditions, helping reduce surface indentation, hole-edge wear, and corrosion risk during long-term service.

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PREV：JIS B 1256 (NA):2008 Grade A Flat Washer NEXT：HB 1 510:1983 Fiber Washer

Dimensions unit: inch

Specification 

0#

2#

4#

6#

8#

10#

3/16

12#

1/4

1/4

5/16

5/16

3/8

3/8

7/16

Type

-

-

-

-

-

-

-

-

N

W

N

W

N

W

N

d

Max.

0.078

0.094

0.133

0.164

0.196

0.227

0.265

0.265

0.296

0.327

0.359

0.39

0.421

0.453

0.484

Min.

0.073

0.089

0.12

0.151

0.183

0.214

0.245

0.245

0.276

0.307

0.339

0.37

0.401

0.433

0.464

dc

Nominal

0.188

0.25

0.312

0.375

0.438

0.5

0.562

0.562

0.625

0.734

0.688

0.875

0.812

1

0.922

Max.

0.188

0.25

0.32

0.39

0.453

0.515

0.577

0.577

0.64

0.749

0.703

0.905

0.827

1.03

0.937

Min.

0.183

0.245

0.307

0.37

0.433

0.495

0.557

0.557

0.62

0.727

0.681

0.868

0.805

0.993

0.915

h

Nominal

0.02

0.02

0.032

0.049

0.049

0.049

0.049

0.065

0.065

0.065

0.065

0.083

0.065

0.083

0.065

Max.

0.025

0.025

0.04

0.065

0.065

0.065

0.065

0.08

0.08

0.08

0.08

0.104

0.08

0.104

0.08

Min.

0.016

0.016

0.025

0.036

0.036

0.036

0.036

0.051

0.051

0.051

0.051

0.064

0.051

0.064

0.051

   

Specification 

7/16

1/2

1/2

9/16

9/16

5/8

5/8

3/4

3/4

7/8

7/8

1

1

1-1/8

1-1/8

Type

W

N

W

N

W

N

W

N

W

N

W

N

W

N

W

d

Max.

0.515

0.546

0.577

0.609

0.64

0.686

0.718

0.842

0.842

0.968

0.968

1.092

1.092

1.28

1.28

Min.

0.495

0.526

0.557

0.589

0.62

0.649

0.681

0.805

0.805

0.931

0.931

1.055

1.055

1.243

1.243

dc

Nominal

1.25

1.062

1.375

1.156

1.469

1.312

1.75

1.469

2

1.75

2.25

2

2.5

2.25

2.75

Max.

1.28

1.092

1.405

1.186

1.499

1.342

1.78

1.499

2.03

1.78

2.28

2.03

2.53

2.28

2.78

Min.

1.243

1.055

1.368

1.149

1.462

1.305

1.743

1.462

1.993

1.743

2.243

1.993

2.493

2.243

2.743

h

Nominal

0.083

0.095

0.109

0.095

0.109

0.095

0.134

0.134

0.148

0.134

0.165

0.134

0.165

0.134

0.165

Max.

0.104

0.121

0.132

0.121

0.132

0.121

0.16

0.16

0.177

0.16

0.192

0.16

0.192

0.16

0.192

Min.

0.064

0.074

0.086

0.074

0.086

0.074

0.108

0.108

0.122

0.108

0.136

0.108

0.136

0.108

0.136

  

Specification 

1-1/4

1-1/4

1-3/8

1-3/8

1-1/2

1-1/2

1-5/8

1-3/4

1-7/8

2

2-1/4

2-1/2

2-3/4

3

Type

N

W

N

W

N

W

-

-

-

-

-

-

-

-

d

Max.

1.405

1.405

1.53

1.545

1.655

1.67

1.795

1.92

2.045

2.17

2.42

2.67

2.94

3.19

Min.

1.368

1.368

1.493

1.49

1.618

1.615

1.74

1.865

1.99

2.115

2.365

2.615

2.865

3.115

dc

Nominal

2.5

3

2.75

3.25

3

3.5

3.75

4

4.25

4.5

4.75

5

5.25

5.5

Max.

2.53

3.03

2.78

3.295

3.03

3.545

3.795

4.045

4.295

4.545

4.795

5.045

5.315

5.565

Min.

2.493

2.993

2.743

3.24

2.993

3.49

3.74

3.99

4.24

4.49

4.74

4.99

5.24

5.49

h

Nominal

0.165

0.165

0.165

0.18

0.165

0.18

0.18

0.18

0.18

0.18

0.22

0.238

0.259

0.284

Max.

0.192

0.192

0.192

0.213

0.192

0.213

0.213

0.213

0.213

0.213

0.248

0.28

0.31

0.327

Min.

0.136

0.136

0.136

0.153

0.136

0.153

0.153

0.153

0.153

0.153

0.193

0.21

0.228

0.249

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