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ASME B18.2.1 (T9):2012 External Hexalobular Torx Screw

ASME B18.2.1 (T9):2012 External Hexalobular Torx Screw combines an external Torx drive with a flanged bearing surface. It is suitable for threaded joints requiring stable tool engagement, higher assembly efficiency, and reduced washer use.

The screw can be driven into tapped holes or used with internally threaded components for automotive parts, motors, machinery housings, brackets, and equipment panels. The flange distributes clamping pressure, and the external Torx drive supports automated or high-efficiency installation.

Drive size, engagement depth, base material strength, and finish should be confirmed. For high-speed production lines, drive-head accuracy and tool wear should be controlled to maintain stable tightening.

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Dimensions unit: mm

Thread size d

1/4

5/16

3/8

7/16

1/2

9/16

5/8

3/4

7/8

1

1-1/8

1-1/4

1-3/8

PP

UNC

20

18

16

14

13

12

11

10

9

8

7

7

6

dk

Reference

0.287

0.362

0.431

0.499

0.571

0.645

0.715

0.86

1

1.138

1.28

1.42

1.562

k

Max.

0.255

0.323

0.394

0.472

0.515

0.551

0.63

0.787

0.866

1.063

1.181

1.299

1.417

Min.

0.245

0.313

0.384

0.462

0.505

0.541

0.62

0.777

0.856

1.053

1.171

1.289

1.407

h

Max.

0.07

0.1

0.125

0.155

0.16

0.165

0.2

0.255

0.27

0.355

0.382

0.422

0.453

Min.

0.06

0.09

0.115

0.145

0.15

0.153

0.188

0.243

0.26

0.343

0.37

0.41

0.441

dc

Max.

0.375

0.469

0.562

0.656

0.75

0.844

0.938

1.125

1.312

1.5

1.688

1.875

2.062

Min.

0.365

0.457

0.55

0.642

0.735

0.828

0.921

1.107

1.293

1.479

1.665

1.852

2.038

B

Max.

0.2073

0.2663

0.3103

0.3613

0.4113

0.4663

0.5183

0.6183

0.7193

0.8393

0.9433

1.0463

1.1513

Torx header code

E8

E10

E12

E14

E16

E18

E20

E24

E28

E32

E36

E40

E44

ds

Max.

0.25

0.3125

0.375

0.4375

0.5

0.5625

0.625

0.75

0.875

1

1.125

1.25

1.375

Min.

0.245

0.3065

0.369

0.4305

0.493

0.5545

0.617

0.741

0.866

0.99

1.114

1.239

1.363

b

L≤6

0.75

0.875

1

1.125

1.25

1.375

1.5

1.75

2

2.25

2.5

2.75

3

L＞6

1

1.125

1.25

1.375

1.5

1.625

1.75

2

2.25

2.5

2.75

3

3.25

r

Max.

0.025

0.025

0.025

0.025

0.025

0.45

0.45

0.45

0.065

0.095

0.095

0.095

0.095

Min.

0.015

0.015

0.015

0.015

0.015

0.02

0.02

0.02

0.04

0.06

0.06

0.06

0.06

Thousand pieces of steel weigh ≈kg

Reference value

-

-

-

-

-

-

-

-

-

-

-

-

-

Thread length b

Reference value

-

-

-

-

-

-

-

-

-

-

-

-

-

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