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ASME/ANSI B18.21.1 (T2):2009 Heavy Spring Washer

ASME/ANSI B18.21.1 (T2):2009 Heavy Spring Washer is used in inch-series connections requiring enhanced loosening resistance and elastic support. The heavy pattern usually provides a larger section and stronger spring reaction, making it suitable for bolt joints with higher clamping force or vibration exposure.

It can be used on equipment bases, auxiliary steel connections, construction machinery, pipe supports, and maintenance assemblies. After compression, the split spring washer provides rebound that helps compensate for slight relaxation and improves long-term stability of the fastener set.

Material, hardness, and surface treatment can be selected according to inch bolt size, load level, and corrosion-resistance needs, meeting requirements in general industrial and outdoor installation environments.

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PREV：DIN 7980:1987 Socket Head Cap Spring Washer NEXT：DIN 137 (B):1994 Wave Spring Washer

Dimensions unit: inch

Specification

2#

3#

4#

5#

6#

8#

10#

12#

1/4

5/16

3/8

7/16

1/2

d

Max.

0.094

0.107

0.12

0.133

0.148

0.174

0.2

0.227

0.26

0.322

0.385

0.45

0.512

Min.

0.088

0.101

0.114

0.127

0.141

0.167

0.193

0.22

0.252

0.314

0.377

0.44

0.502

dc

Max.

0.182

0.209

0.223

0.252

0.266

0.307

0.35

0.391

0.489

0.593

0.688

0.784

0.879

h

Min.

0.025

0.031

0.031

0.04

0.04

0.047

0.056

0.063

0.077

0.097

0.115

0.133

0.151

n

Min.

0.04

0.047

0.047

0.055

0.055

0.062

0.07

0.077

0.11

0.13

0.145

0.16

0.176

n1

Min.

0.028

0.033

0.033

0.038

0.038

0.043

0.049

0.054

0.077

0.091

0.101

0.112

0.123

  

Specification

9/16

5/8

11/16

3/4

13/16

7/8

15/16

1

1-1/16

1-1/8

1-3/16

1-1/4

1-5/16

d

Max.

0.574

0.641

0.704

0.766

0.832

0.894

0.958

1.024

1.087

1.153

1.217

1.28

1.344

Min.

0.564

0.628

0.691

0.753

0.816

0.878

0.941

1.003

1.066

1.129

1.192

1.254

1.317

dc

Max.

0.975

1.087

1.186

1.285

1.387

1.489

1.59

1.7

1.803

1.903

2.001

2.104

2.203

h

Min.

0.17

0.189

0.207

0.226

0.246

0.266

0.284

0.306

0.326

0.345

0.364

0.384

0.403

n

Min.

0.193

0.21

0.227

0.244

0.262

0.281

0.298

0.319

0.338

0.356

0.373

0.393

0.41

n1

Min.

0.135

0.147

0.159

0.171

0.183

0.197

0.209

0.223

0.237

0.249

0.261

0.275

0.287

  

Specification

1-3/8

1-7/16

1-1/2

1-5/8

1-3/4

1-7/8

2

2-1/4

2-1/2

2-3/4

3

d

Max.

1.408

1.472

1.534

1.663

1.789

1.914

2.039

2.293

2.543

2.793

3.043

Min.

1.379

1.442

1.504

1.633

1.758

1.883

2.008

2.262

2.512

2.762

3.012

dc

Max.

2.301

2.396

2.491

2.694

2.82

2.945

3.144

3.398

3.648

3.91

4.16

h

Min.

0.422

0.44

0.458

0.458

0.458

0.458

0.496

0.496

0.496

0.526

0.526

n

Min.

0.427

0.442

0.458

0.491

0.491

0.491

0.526

0.526

0.526

0.532

0.532

n1

Min.

0.299

0.309

0.321

0.344

0.344

0.344

0.368

0.368

0.368

0.372

0.372

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Better Fastener is a professional fastener enterprise specializing in the manufacturing of steel washers, stainless steel washers, spring washers and sealingwashers. Founded in 2001 as a washer factory, the company expanded into a comprehensive enterprise integrating washers, nuts, bolts, spring nuts and other fastener products in 2010.

The company positions itself as a provider of comprehensive one-stop services for customers, relying on technological R&D, industrial investment and trade distribution.

With an experienced professional team and a sound sales network, Better Fastener has achieved excellent sales performance in both domestic and foreign markets,and has grown into one of the competitive manufacturers and suppliers in China's industrial fastener industry.

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NEWS

Latest News

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    A screw is a fastening tool that utilizes the principle of an inclined spiral plane to join or secure objects together. Its core structure consists of a cylindrical body with continuous threads (like spiral ridges), typically featuring a head at one end for convenient rotation. When turned, the rotational motion is con...

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  • What is a Nuts?

    Now that we've covered bolts, their "perfect partner" — the nut — is much easier to understand. Simply put, a nut is a small metal block or disc with a round hole in the center and internal threads on the wall of that hole. Its core function is to work with an externally threaded bolt to clamp two or more components to...

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  • What is a Washers?

    Simply put, a washer is a thin, disc-shaped ring with a central hole, typically made of metal (such as carbon steel, stainless steel, or copper) or non-metallic materials (such as rubber, plastic, or asbestos). It is placed between the head of a bolt/nut and the surface of the workpiece, or at the junction between the ...

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  • What is a Bolt?

    Simply put, a bolt is a cylindrical fastener with external threads. It works with a matching nut or is screwed directly into a threaded hole of the mating part to firmly hold two or more components together. To put it intuitively, think of it as a "metal nail." However, unlike a nail that is driven in with a hammer, a ...

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