Thread Code

Rec Min. Sheet Thickness

Hole size In Sheet
+.008

C
+.000
-.005

D
Min. Thread Depth

H
Nom.

256

.025

.166

.165

.200

.187

6256

.025

.213

.212

.250

440

.025

.166

.165

.220

.187

6440

.025

.213

.212

.250

632

.025

.213

.212

.270

.250

Thread Code

Rec Min. Sheet Thickness

Hole size In Sheet
+0.08

C
-0.13

D
Min. Thread Depth

H
Nom.

M2.5

0.63

4.22

4.19

5.2

4.75

3.5M2.5

0.63

5.41

5.39

6.35

M3

0.63

4.22

4.19

6.2

4.75

3.5M3

0.63

5.41

5.4

6.35

M3.5

0.63

5.41

5.4

7.0

6.35

UNIFIED

Thread Size

Type

Thread Code

Length "L" ±.003 For other lengths/thread depth data see chat below

Min.Dist Hole C/L To Edge

Steel

Stainless Steel

Aluminum

.090

.125

.187

.250

.312

.375

.437

.500

.562

.625

.687

.750

Length Code ( Length "L" without decimal point )

.086-56(#2-56)

TSO

TSOS

TSOA

256

090(1)

125(1)

187(1)

250(1)

312(2)

375(2)

437(3)

500(3)

562(3)

625(3)

687(3)

750(3)

.23

6256(4)

.27

.112-40(#4-40)

TSO

TSOS

TSOA

440

090(1)

125(1)

187(1)

250(1)

312(2)

375(2)

437(2)

500(3)

562(3)

625(3)

687(3)

750(3)

.23

6440(4)

.27

.138-32(#6-32)

TSO

TSOS

TSOA

632

/

125(1)

187(1)

250(1)

312(1)

375(2)

437(2)

500(2)

562(3)

625(3)

687(3)

750(3)

.27

METRIC

Thread Size

Type

Thread Code

Length "L" ±0.08 For other lengths/thread depth data see chat below

Min.Dist Hole C/L To Edge

Steel

Stainless Steel

Aluminum

2

3

4

6

8

10

12

14

16

18

19

Length Code ( Length "L" without decimal point )

M2.5X0.45

TSO

TSOS

TSOA

M2.5

200(1)

300(1)

400(1)

600(1)

800(2)

1000(3)

1200(3)

1400(3)

1600(3)

1800(3)

1900(3)

5.8

3.5M2.5(4)

7.1

M3X0.5

TSO

TSOS

TSOA

M3

200(1)

300(1)

400(1)

600(1)

800(2)

1000(2)

1200(3)

1400(3)

1600(3)

1800(3)

1900(3)

5.8

3.5M3(4)

7.1

M3.5X0.6

TSO

TSOS

TSOA

M3.5

/

300(1)

400(1)

600(1)

800(1)

1000(2)

1200(2)

1400(3)

1600(3)

1800(3)

1900(3)

7.1