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ASME/ANSI B18.6.3:2010 Pan Head Phillips Screw

ASME/ANSI B18.6.3:2010 Pan Head Phillips Screw combines a Phillips drive with a pan 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, the low domed head balances bearing area with a clean appearance, leaving a defined head profile without excessive surface marking, so the screw can provide stable fastening performance across different sheet thicknesses, appearance requirements, and space limitations.

It is commonly used in electrical equipment, instrument panels, cabinet components, and general mechanical assemblies. Supply configuration can be refined by size range, strength grade, thread specification, recess control, and surface finish, making it suitable for use with washers, nuts, or pre-tapped holes.

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This type of recess has a large center opening,tapered wings,and blunt bottom,with all edges relieved or rounded.

Unit: inch

Thread size d

dk

k

Cross recess

max

min

max

min

M

Slot number

#0

0.116

0.104

0.044

0.036

0.06

0

#1

0.142

0.13

0.053

0.044

0.067

0

#2

0.167

0.155

0.062

0.053

0.097

1

#3

0.193

0.18

0.071

0.062

0.105

1

#4

0.219

0.205

0.08

0.07

0.115

1

#5

0.245

0.231

0.089

0.079

0.152

2

#6

0.27

0.256

0.097

0.087

0.159

2

#8

0.322

0.306

0.115

0.105

0.175

2

#10

0.373

0.357

0.133

0.122

0.192

2

#12

0.425

0.407

0.151

0.139

0.252

3

1/4

0.492

0.473

0.175

0.162

0.274

3

5/16

0.615

0.594

0.218

0.203

0.343

4

3/8

0.74

0.716

0.261

0.244

0.382

4

7/16

0.863

0.837

0.305

0.284

0.406

4

1/2

0.987

0.958

0.348

0.325

0.428

4

9/16

1.041

1

0.391

0.366

0.458

4

5/8

1.172

1.125

0.434

0.406

0.575

5

3/4

1.435

1.375

0.521

0.488

0.621

5

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