UNIFIED

Thread Size

Type

Thread Code

Length "L" ±.015
( Length Code is in 16ths of an inch)

Min.Sheet Thickness

Hole Size In Sheet +.003

Max.Hole in Attach Parts

H
±.015

S Max.

Min.Dist Hole C/L To Edge

Steel

Stainless Steel

Aluminum

.250

.312

.375

.500

.625

.750

.875

1.00

1.25

1.50

.086-56(#2-56)

FH

FHS

FHA

256

4

5

6

8

10

12

/

/

/

/

.040

.085

.105

.144

.075

.187

.112-40(#4-40)

FH

FHS

FHA

440

4

5

6

8

10

12

14

16

/

/

.040

.111

.135

.176

.085

.219

.138-32(#6-32)

FH

FHS

FHA

632

4

5

6

8

10

12

14

16

20

24

.040

.137

.160

.206

.090

.250

.164-32(#8-32)

FH

FHS

FHA

832

4

5

6

8

10

12

14

16

20

24

.040

.163

.185

.237

.090

.281

.190-24(#10-24)

FH

FHS

FHA

024

/

5

6

8

10

12

14

16

20

24

.040

.189

.210

.256

.100

.281

.190-32(#10-32)

FH

FHS

FHA

032

/

5

6

8

10

12

14

16

20

24

.040

.189

.210

.256

.100

.281

.250-20(1/4-20)

FH

FHS

FHA

0420

/

/

6

8

10

12

14

16

20

24

.062

.249

.270

.337

.135

.312

.313-18(5/16-18)

FH

FHS

FHA

0518

/

/

/

8

10

12

14

16

20

24

.093

.311

.333

.376

.160

.375

METRIC

Thread Size

Type

Thread Code

Length Code"L" ± 0.4
( Length Code is in millimeters)

Min.Sheet Thickness

Hole Size In Sheet +0.08

Max.Hole in Attach Parts

H
±0.4

S Max.

Min.Dist Hole C/L To Edge

Steel

Stainless Steel

Aluminum

M2.5X0.45

FH

FHS

FHA

M2.5

6

8

10

12

15

18

/

/

/

/

1

2.5

3.1

4.1

1.95

5.4

M3X0.5

FH

FHS

FHA

M3

6

8

10

12

15

18

20

25

/

/

1

3

3.6

4.6

2.1

5.6

M3.5X0.6

FH

FHS

FHA

M3.5

6

8

10

12

15

18

20

25

30

/

1

3.5

4.1

5.3

2.25

6.4

M4X0.7

FH

FHS

FHA

M4

6

8

10

12

15

18

20

25

30

35

1

4

4.6

5.9

2.4

7.2

M5X0.8

FH

FHS

FHA

M5

/

8

10

12

15

18

20

25

30

35

1

5

5.6

6.5

2.7

7.2

M6X1.0

FH

FHS

FHA

M6

/

/

10

12

15

18

20

25

30

35

1.6

6

6.6

8.2

3

7.9

M8X1.25

FH

FHS

FHA

M8

/

/

/

12

15

18

20

25

30

35

2.4

8

8.6

9.6

3.7

9.6