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Home / Products / Screws / Slotted Screws / ASME B18.6.3 (H7A):2024 Round Head Slotted Screw

ASME B18.6.3 (H7A):2024 Round Head Slotted Screw

ASME B18.6.3 (H7A):2024 Round Head Slotted Screw combines a slotted drive with a round head, making it suitable for fastening points that require reliable clamping, removable maintenance, and standardized assembly. The ASME standard framework suits projects requiring U.S.-standard compatibility and engineering applicability, supporting smooth alignment between engineering drawings, purchasing lists, and quality inspection.

From an assembly perspective, the slot is easy to identify and works with simple tools, which supports routine maintenance and manual assembly. At the same time, the rounded head provides a smooth visible profile, reducing sharp edges while offering a practical bearing area, so the screw can provide stable fastening performance across different sheet thicknesses, appearance requirements, and space limitations.

It fits visible parts, light equipment, panel fastening, and installation points where sharp protrusions 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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Dimensions unit: inch

Thread size d

0000#

000#

00#

0#

1#

2#

3#

4#

5#

6#

8#

d

Nominal

0.0210

0.0340

0.0470

0.0600

0.0730

0.0860

0.0990

0.1120

0.1250

0.1380

0.1640

PP

160

120

90

80

64

56

48

40

40

32

32

dk

Max.

0.049

0.077

0.106

0.131

0.164

0.194

0.226

0.257

0.289

0.321

0.384

Min.

0.043

0.071

0.098

0.119

0.149

0.180

0.211

0.241

0.272

0.303

0.364

k

Max.

0.014

0.022

0.030

0.037

0.045

0.053

0.061

0.069

0.078

0.086

0.102

Min.

0.010

0.018

0.024

0.029

0.037

0.044

0.051

0.059

0.066

0.074

0.088

n

Max.

0.009

0.013

0.017

0.023

0.026

0.031

0.035

0.039

0.043

0.048

0.054

Min.

0.005

0.009

0.010

0.016

0.019

0.023

0.027

0.031

0.035

0.039

0.045

t

Max.

0.009

0.013

0.018

0.022

0.027

0.031

0.036

0.040

0.045

0.050

0.058

Min.

0.005

0.009

0.012

0.014

0.018

0.022

0.026

0.030

0.034

0.037

0.045

R

Max.

0.032

0.051

0.070

0.087

0.107

0.129

0.151

0.169

0.191

0.211

0.254

  

Thread size d

10#

12#

1/4

5/16

3/8

7/16

1/2

9/16

5/8

3/4

d

Nominal

0.1900

0.2160

0.2500

0.3125

0.3750

0.4375

0.5000

0.5625

0.6250

0.7500

PP

24

24

20

18

16

14

13

12

11

10

dk

Max.

0.448

0.511

0.573

0.698

0.823

0.948

1.073

1.198

1.323

1.573

Min.

0.425

0.487

0.546

0.666

0.787

0.907

1.028

1.149

1.269

1.511

k

Max.

0.118

0.134

0.150

0.183

0.215

0.248

0.280

0.312

0.345

0.410

Min.

0.103

0.118

0.133

0.162

0.191

0.221

0.250

0.279

0.309

0.368

n

Max.

0.060

0.067

0.075

0.084

0.094

0.094

0.106

0.118

0.133

0.149

Min.

0.050

0.056

0.064

0.072

0.081

0.081

0.091

0.102

0.116

0.131

t

Max.

0.068

0.077

0.087

0.106

0.124

0.142

0.161

0.179

0.196

0.234

Min.

0.053

0.061

0.070

0.085

0.100

0.116

0.131

0.146

0.162

0.182

R

Max.

0.283

0.336

0.375

0.457

0.538

0.619

0.701

0.783

0.863

1.024

 

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