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ASME/ANSI B18.6.3:2003 Truss Head Phillips Screw

ASME/ANSI B18.6.3:2003 Truss Head Phillips Screw combines a Phillips drive with a truss head, making it suitable for fastening points that require reliable clamping, removable maintenance, and standardized assembly. The ASME/ANSI framework suits U.S.-standard projects, export equipment, and cross-regional supply chains, supporting smooth alignment between engineering drawings, purchasing lists, and quality inspection.

From an assembly perspective, the cross recess provides good centering and suits production assembly, workstation operations, and joints requiring controlled driving. At the same time, uses a large, low-profile head to provide wider clamping coverage on sheet or softer materials, so the screw can provide stable fastening performance across different sheet thicknesses, appearance requirements, and space limitations.

It is suitable for sheet overlaps, panel fastening, light structural parts, and joints where deep local indentation should be avoided. For exposed equipment positions, head forming quality, recess integrity, edge chamfering, and coating uniformity can be emphasized so fastening performance aligns with the finished product appearance.

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Unit：mm

Nom d

P UNC

dk

k

max

min

max

min

#0

80

0.131

0.119

0.037

0.029

#1

64

0.164

0.149

0.045

0.037

#2

56

0.194

0.180

0.053

0.044

#3

48

0.226

0.211

0.061

0.051

#4

40

0.257

0.241

0.069

0.059

#5

40

0.289

0.272

0.078

0.066

#6

32

0.321

0.303

0.086

0.074

#8

32

0.384

0.364

0.102

0.088

#10

24

0.448

0.425

0.118

0.103

#12

24

0.511

0.487

0.134

0.118

1/4

20

0.573

0.546

0.150

0.133

5/16

18

0.698

0.666

0.183

0.162

3/8

16

0.823

0.787

0.215

0.191

7/16

14

0.948

0.907

0.248

0.221

1/2

13

1.073

1.028

0.280

0.250

9/16

12

1.198

1.149

0.312

0.279

5/8

11

1.323

1.269

0.345

0.309

3/4

10

1.573

1.511

0.410

0.368

 

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