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Home / Products / Screws / Hexagon Socket Screws / ASME B18.3 (T11):2012 Round Head Hex Socket Screw

ASME B18.3 (T11):2012 Round Head Hex Socket Screw

ASME B18.3 (T11):2012 Round Head Hex Socket Screw combines a hex socket 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 internal hex socket provides deeper tool engagement, enabling higher assembly torque in compact spaces while reducing external head interference. 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. It can be supplied in carbon steel, alloy steel, stainless steel, and other materials, with zinc plating, nickel plating, black oxide, phosphating, or other finishes to balance corrosion resistance, appearance, and assembly friction.

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Dimensions unit: inch

Nominal diameter  d

0#

1#

2#

3#

4#

5#

6#

8#

d

Nominal diameter 

0.06

0.073

0.086

0.099

0.112

0.125

0.138

0.164

PP

Coarse teeth/UNC

-

64

56

48

40

40

32

32

Fine Teeth/UNF

80

72

64

56

48

44

40

36

Extra-Fine Thread/UNEF

-

-

-

-

-

-

-

-

dk

Max.

0.114

0.139

0.164

0.188

0.213

0.238

0.262

0.312

Min.

0.104

0.129

0.154

0.176

0.201

0.226

0.25

0.298

da

Max.

0.08

0.093

0.106

0.119

0.132

0.145

0.158

0.194

Min.

0.07

0.083

0.096

0.109

0.122

0.135

0.148

0.184

k

Max.

0.032

0.039

0.046

0.052

0.059

0.066

0.073

0.087

Min.

0.026

0.033

0.038

0.044

0.051

0.058

0.063

0.077

s

Nominal

0.035

0.05

0.05

0.062

0.062

0.078

0.078

0.094

t

Min.

0.02

0.028

0.028

0.035

0.035

0.044

0.044

0.052

L ①

Maximum standard length

Nominal

0.5

0.5

0.5

0.5

0.5

0.5

0.63

0.75

c

Reference

0.01

0.01

0.01

0.01

0.015

0.015

0.015

0.015

  

Nominal diameter d

10#

1/4

5/16

3/8

7/16

1/2

5/8

3/4

d

Nominal diameter 

0.19

0.25

0.3125

0.375

0.4375

0.5

0.625

0.75

PP

Coarse teeth/UNC

24

20

18

16

14

13

11

10

Fine Teeth/UNF

32

28

24

24

20

20

18

16

Extra-Fine Thread/UNEF

-

32

32

32

28

28

24

20

dk

Max.

0.361

0.437

0.547

0.656

0.765

0.875

1

1.125

Min.

0.347

0.419

0.527

0.636

0.746

0.851

0.97

1.105

da

Max.

0.22

0.29

0.353

0.415

0.478

0.56

0.685

0.74

Min.

0.21

0.28

0.343

0.405

0.468

0.54

0.665

0.72

k

Max.

0.101

0.132

0.166

0.199

0.231

0.265

0.331

0.375

Min.

0.091

0.122

0.152

0.185

0.218

0.245

0.311

0.355

s

Nominal

0.125

0.156

0.188

0.219

0.25

0.312

0.375

0.437

t

Min.

0.07

0.087

0.105

0.122

0.14

0.175

0.21

0.245

L ①

Maximum standard length

Nominal

1

1

1

1.25

1.5

2

2

2.5

c

Reference

0.02

0.031

0.031

0.031

0.031

0.046

0.062

0.062

 

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