SMTSO Threaded Surface Mount Nuts and Spacers

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Threaded Surface Mount Nuts
& Spacers Standoffs SMTSO-U

Self Clinching Fasteners • Fasteners for PC Boards
American Standard (Inches) & Metric Sizes

UNICORP Electronic Hardware Self-Clinching Fasteners - Threaded Surface Mount Nuts & Space Standoffs SMTSO

• Self-clinching • Threaded • Provided on 13" recyclable reel • Hex barrel
• Polyamide patch • Used as PC Board attachment • Installed quickly and easily
• Minimum sheet thickness of 0.060" /0.50 mm

American Standard Sizes: • Series SMTSO-U

Metric Sizes: • Series SMTSO-U

Series SMTSO-U

Series SMTSO-U / American Standard Sizes
• Sheet Hardness- N/A • Material- Carbon Steel • Mil-Spec- N/A • "DT" Finish- Electro-Plated Matte-Tin per ASTM B 545, Class A with/ Clear Preservative Coating, Annealed • "ET" Finish- Electro-Plated Bright Tin per ASTM B545, Class A with Clear Preservative Coating
	Series SMTSO-U American Standard Sizes (SAE)

Part
Number

Thread
Size

"A"
Max.

"C"
Max.

"E"

"L"
Length

Min.
Sheet
Thickness

"H" Hole
Size in
Sheet

"D"
Min.
Solder
Pad

Parts
per Reel

Pitch

Part Numbers with "DT" Finish

SMTSO-256-2DT-U

2-56

0.060"

0.142"

0.219"

0.062"

0.060"

0.147"

0.244"

1500

12.00
mm

SMTSO-256-4DT-U

2-56

0.060"

0.142"

0.219"

0.125"

0.060"

0.147"

0.244"

1000

12.00
mm

SMTSO-256-8DT-U

2-56

0.060"

0.142"

0.219"

0.250"

0.060"

0.147"

0.244"

650

12.00
mm

SMTSO-256-12DT-U

2-56

0.060"

0.142"

0.219"

0.375"

0.060"

0.147"

0.244"

300

16.00
mm

SMTSO-440-2DT-U

4-40

0.060"

0.161"

0.219"

0.062"

0.060"

0.166"

0.244"

1500

12.00
mm

SMTSO-440-4DT-U

4-40

0.060"

0.161"

0.219"

0.125"

0.060"

0.166"

0.244"

1000

12.00
mm

SMTSO-440-8DT-U

4-40

0.060"

0.161"

0.219"

0.250"

0.060"

0.166"

0.244"

650

12.00
mm

SMTSO-440-12DT-U

4-40

0.060"

0.161"

0.219"

0.375"

0.060"

0.166"

0.244"

300

16.00
mm

SMTSO-632-2DT-U

6-32

0.060"

0.208"

0.281"

0.062"

0.060"

0.213"

0.306"

1500

12.00
mm

SMTSO-632-4DT-U

6-32

0.060"

0.208"

0.281"

0.125"

0.060"

0.213"

0.306"

1000

12.00
mm

SMTSO-632-8DT-U

6-32

0.060"

0.208"

0.281"

0.250"

0.060"

0.213"

0.306"

650

12.00
mm

SMTSO-632-12DT-U

6-32

0.060"

0.208"

0.281"

0.375"

0.060"

0.213"

0.306"

300

16.00
mm

SMTSO-832-2DT-U

8-32

0.060"

0.245"

0.344"

0.062"

0.060"

0.250"

0.369"

1500

16.00
mm

SMTSO-832-4DT-U

8-32

0.060"

0.245"

0.344"

0.125"

0.060"

0.250"

0.369"

1000

16.00
mm

SMTSO-832-8DT-U

8-32

0.060"

0.245"

0.344"

0.250"

0.060"

0.250"

0.369"

650

16.00
mm

SMTSO-832-12DT-U

8-32

0.060"

0.245"

0.344"

0.375"

0.060"

0.250"

0.369"

300

16.00
mm

Part Numbers with "ET" Finish

SMTSO-256-2ET-U

2-56

0.060"

0.142"

0.219"

0.062"

0.060"

0.147"

0.244"

1500

12.00
mm

SMTSO-256-4ET-U

2-56

0.060"

0.142"

0.219"

0.125"

0.060"

0.147"

0.244"

1000

12.00
mm

SMTSO-256-8ET-U

2-56

0.060"

0.142"

0.219"

0.250"

0.060"

0.147"

0.244"

650

12.00
mm

SMTSO-256-12ET-U

2-56

0.060"

0.142"

0.219"

0.375"

0.060"

0.147"

0.244"

300

16.00
mm

SMTSO-440-2ET-U

4-40

0.060"

0.161"

0.219"

0.062"

0.060"

0.166"

0.244"

1500

12.00
mm

SMTSO-440-4ET-U

4-40

0.060"

0.161"

0.219"

0.125"

0.060"

0.166"

0.244"

1000

12.00
mm

SMTSO-440-8ET-U

4-40

0.060"

0.161"

0.219"

0.250"

0.060"

0.166"

0.244"

650

12.00
mm

SMTSO-440-12ET-U

4-40

0.060"

0.161"

0.219"

0.375"

0.060"

0.166"

0.244"

300

16.00
mm

SMTSO-632-2ET-U

6-32

0.060"

0.208"

0.281"

0.062"

0.060"

0.213"

0.306"

1500

12.00
mm

SMTSO-632-4ET-U

6-32

0.060"

0.208"

0.281"

0.125"

0.060"

0.213"

0.306"

1000

12.00
mm

SMTSO-632-8ET-U

6-32

0.060"

0.208"

0.281"

0.250"

0.060"

0.213"

0.306"

650

12.00
mm

SMTSO-632-12ET-U

6-32

0.060"

0.208"

0.281"

0.375"

0.060"

0.213"

0.306"

300

16.00
mm

SMTSO-832-2ET-U

8-32

0.060"

0.245"

0.344"

0.062"

0.060"

0.250"

0.369"

1500

16.00
mm

SMTSO-832-4ET-U

8-32

0.060"

0.245"

0.344"

0.125"

0.060"

0.250"

0.369"

1000

16.00
mm

SMTSO-832-8ET-U

8-32

0.060"

0.245"

0.344"

0.250"

0.060"

0.250"

0.369"

650

16.00
mm

SMTSO-832-12ET-U

8-32

0.060"

0.245"

0.344"

0.375"

0.060"

0.250"

0.369"

300

16.00
mm

Series SMTSO-U / Metric Sizes
• Sheet Hardness- N/A • Material- Carbon Steel • Mil-Spec- N/A • "DT" Finish- Electro-Plated Matte-Tin per ASTM B 545, Class A with/ Clear Preservative Coating, Annealed • "ET" Finish- Electro-Plated Bright Tin per ASTM B545, Class A with Clear Preservative Coating
	Series SMTSO-U Metric Sizes

Part
Number

Thread
Size

"A"
Max.

"C"
Max.

"E"

"L"
Length

Min.
Sheet
Thickness

"H" Hole
Size in
Sheet

"D"
Min.
Solder
Pad

Parts
per Reel

Pitch

Part Numbers with "DT" Finish

SMTSO-M1-1DT-U

0.48
mm

2.41
mm

3.66
mm

1.00
mm

0.50
mm

2.50
mm

4.19
mm

3500

8.00
mm

SMTSO-M1-2DT-U

0.48
mm

2.41
mm

3.66
mm

2.00
mm

0.50
mm

2.50
mm

4.19
mm

2500

8.00
mm

SMTSO-M1-3DT-U

0.48
mm

2.41
mm

3.66
mm

3.00
mm

0.50
mm

2.50
mm

4.19
mm

2000

8.00
mm

SMTSO-M1.2-1DT-U

S1.2

0.48
mm

2.41
mm

3.66
mm

1.00
mm

0.50
mm

2.50
mm

4.19
mm

3500

8.00
mm

SMTSO-M1.2-2DT-U

S1.2

0.48
mm

2.41
mm

3.66
mm

2.00
mm

0.50
mm

2.50
mm

4.19
mm

2500

8.00
mm

SMTSO-M1.2-3DT-U

S1.2

0.48
mm

2.41
mm

3.66
mm

3.00
mm

0.50
mm

2.50
mm

4.19
mm

2000

8.00
mm

SMTSO-M1.4-1DT-U

S1.4

0.48
mm

2.41
mm

3.66
mm

1.00
mm

0.50
mm

2.50
mm

4.19
mm

3500

8.00
mm

SMTSO-M1.4-2DT-U

S1.4

0.48
mm

2.41
mm

3.66
mm

2.00
mm

0.50
mm

2.50
mm

4.19
mm

2500

8.00
mm

SMTSO-M1.4-3DT-U

S1.4

0.48
mm

2.41
mm

3.66
mm

3.00
mm

0.50
mm

2.50
mm

4.19
mm

2000

8.00
mm

SMTSO-M1.6-1DT-U

M1.6 x 0.35

0.48
mm

2.41
mm

3.66
mm

1.00
mm

0.50
mm

2.50
mm

4.19
mm

3500

8.00
mm

SMTSO-M1.6-2DT-U

M1.6 x 0.35

0.48
mm

2.41
mm

3.66
mm

2.00
mm

0.50
mm

2.50
mm

4.19
mm

2500

8.00
mm

SMTSO-M1.6-3DT-U

M1.6 x 0.35

0.48
mm

2.41
mm

3.66
mm

3.00
mm

0.50
mm

2.50
mm

4.19
mm

2000

8.00
mm

SMTSO-M2-2DT-U

M2 x 0.4

1.53
mm

3.60
mm

5.56
mm

2.00
mm

1.53
mm

3.73
mm

6.20
mm

1500

12.00
mm

SMTSO-M2-3DT-U

M2 x 0.4

1.53
mm

3.60
mm

5.56
mm

3.00
mm

1.53
mm

3.73
mm

6.20
mm

1000

12.00
mm

SMTSO-M2-4DT-U

M2 x 0.4

1.53
mm

3.60
mm

5.56
mm

4.00
mm

1.53
mm

3.73
mm

6.20
mm

900

12.00
mm

SMTSO-M2-6DT-U

M2 x 0.4

1.53
mm

3.60
mm

5.56
mm

6.00
mm

1.53
mm

3.73
mm

6.20
mm

650

12.00
mm

SMTSO-M2-8DT-U

M2 x 0.4

1.53
mm

3.60
mm

5.56
mm

8.00
mm

1.53
mm

3.73
mm

6.20
mm

375

16.00
mm

SMTSO-M2-10DT-U

M2 x 0.4

1.53
mm

3.60
mm

5.56
mm

10.00
mm

1.53
mm

3.73
mm

6.20
mm

300

16.00
mm

SMTSO-M25-2DT-U

M2.5 x 0.45

1.53
mm

4.09
mm

5.56
mm

2.00
mm

1.53
mm

4.22
mm

6.20
mm

1500

12.00
mm

SMTSO-M25-3DT-U

M2.5 x 0.45

1.53
mm

4.09
mm

5.56
mm

3.00
mm

1.53
mm

4.22
mm

6.20
mm

1000

12.00
mm

SMTSO-M25-4DT-U

M2.5 x 0.45

1.53
mm

4.09
mm

5.56
mm

4.00
mm

1.53
mm

4.22
mm

6.20
mm

900

12.00
mm

SMTSO-M25-6DT-U

M2.5 x 0.45

1.53
mm

4.09
mm

5.56
mm

6.00
mm

1.53
mm

4.22
mm

6.20
mm

650

12.00
mm

SMTSO-M25-8DT-U

M2.5 x 0.45

1.53
mm

4.09
mm

5.56
mm

8.00
mm

1.53
mm

4.22
mm

6.20
mm

375

16.00
mm

SMTSO-M25-10DT-U

M2.5 x 0.45

1.53
mm

4.09
mm

5.56
mm

10.00
mm

1.53
mm

4.22
mm

6.20
mm

300

16.00
mm

SMTSO-M3-2DT-U

M3 x 0.5

1.53
mm

4.09
mm

5.56
mm

2.00
mm

1.53
mm

4.22
mm

6.20
mm

1500

12.00
mm

SMTSO-M3-3DT-U

M3 x 0.5

1.53
mm

4.09
mm

5.56
mm

3.00
mm

1.53
mm

4.22
mm

6.20
mm

1000

12.00
mm

SMTSO-M3-4DT-U

M3 x 0.5

1.53
mm

4.09
mm

5.56
mm

4.00
mm

1.53
mm

4.22
mm

6.20
mm

900

12.00
mm

SMTSO-M3-6DT-U

M3 x 0.5

1.53
mm

4.09
mm

5.56
mm

6.00
mm

1.53
mm

4.22
mm

6.20
mm

650

12.00
mm

SMTSO-M3-8DT-U

M3 x 0.5

1.53
mm

4.09
mm

5.56
mm

8.00
mm

1.53
mm

4.22
mm

6.20
mm

375

16.00
mm

SMTSO-M3-10DT-U

M3 x 0.5

1.53
mm

4.09
mm

5.56
mm

10.00
mm

1.53
mm

4.22
mm

6.20
mm

300

16.00
mm

SMTSO-M35-2DT-U

M3.5 x 0.6

1.53
mm

5.28
mm

7.14
mm

2.00
mm

1.53
mm

5.41
mm

7.77
mm

1500

12.00
mm

SMTSO-M35-3DT-U

M3.5 x 0.6

1.53
mm

5.28
mm

7.14
mm

3.00
mm

1.53
mm

5.41
mm

7.77
mm

1000

12.00
mm

SMTSO-M35-4DT-U

M3.5 x 0.6

1.53
mm

5.28
mm

7.14
mm

4.00
mm

1.53
mm

5.41
mm

7.77
mm

900

12.00
mm

SMTSO-M35-6DT-U

M3.5 x 0.6

1.53
mm

5.28
mm

7.14
mm

6.00
mm

1.53
mm

5.41
mm

7.77
mm

650

12.00
mm

SMTSO-M35-8DT-U

M3.5 x 0.6

1.53
mm

5.28
mm

7.14
mm

8.00
mm

1.53
mm

5.41
mm

7.77
mm

375

16.00
mm

SMTSO-M35-10DT-U

M3.5 x 0.6

1.53
mm

5.28
mm

7.14
mm

10.00
mm

1.53
mm

5.41
mm

7.77
mm

300

16.00
mm

SMTSO-M4-2DT-U

M4 x 0.7

1.53
mm

6.22
mm

8.74
mm

2.00
mm

1.53
mm

6.35
mm

9.37
mm

1100

16.00
mm

SMTSO-M4-3DT-U

M4 x 0.7

1.53
mm

6.22
mm

8.74
mm

3.00
mm

1.53
mm

6.35
mm

9.37
mm

800

16.00
mm

SMTSO-M4-4DT-U

M4 x 0.7

1.53
mm

6.22
mm

8.74
mm

4.00
mm

1.53
mm

6.35
mm

9.37
mm

675

16.00
mm

SMTSO-M4-6DT-U

M4 x 0.7

1.53
mm

6.22
mm

8.74
mm

6.00
mm

1.53
mm

6.35
mm

9.37
mm

500

16.00
mm

SMTSO-M4-8DT-U

M4 x 0.7

1.53
mm

6.22
mm

8.74
mm

8.00
mm

1.53
mm

6.35
mm

9.37
mm

375

16.00
mm

SMTSO-M4-10DT-U

M4 x 0.7

1.53
mm

6.22
mm

8.74
mm

10.00
mm

1.53
mm

6.35
mm

9.37
mm

300

16.00
mm

Part Numbers with "ET" Finish

SMTSO-M1-1ET-U

0.48
mm

2.41
mm

3.66
mm

1.00
mm

0.50
mm

2.50
mm

4.19
mm

3500

8.00
mm

SMTSO-M1-2ET-U

0.48
mm

2.41
mm

3.66
mm

2.00
mm

0.50
mm

2.50
mm

4.19
mm

2500

8.00
mm

SMTSO-M1-3ET-U

0.48
mm

2.41
mm

3.66
mm

3.00
mm

0.50
mm

2.50
mm

4.19
mm

2000

8.00
mm

SMTSO-M1.2-1ET-U

S1.2

0.48
mm

2.41
mm

3.66
mm

1.00
mm

0.50
mm

2.50
mm

4.19
mm

3500

8.00
mm

SMTSO-M1.2-2ET-U

S1.2

0.48
mm

2.41
mm

3.66
mm

2.00
mm

0.50
mm

2.50
mm

4.19
mm

2500

8.00
mm

SMTSO-M1.2-3ET-U

S1.2

0.48
mm

2.41
mm

3.66
mm

3.00
mm

0.50
mm

2.50
mm

4.19
mm

2000

8.00
mm

SMTSO-M1.4-1ET-U

S1.4

0.48
mm

2.41
mm

3.66
mm

1.00
mm

0.50
mm

2.50
mm

4.19
mm

3500

8.00
mm

SMTSO-M1.4-2ET-U

S1.4

0.48
mm

2.41
mm

3.66
mm

2.00
mm

0.50
mm

2.50
mm

4.19
mm

2500

8.00
mm

SMTSO-M1.4-3ET-U

S1.4

0.48
mm

2.41
mm

3.66
mm

3.00
mm

0.50
mm

2.50
mm

4.19
mm

2000

8.00
mm

SMTSO-M1.6-1ET-U

M1.6 x 0.35

0.48
mm

2.41
mm

3.66
mm

1.00
mm

0.50
mm

2.50
mm

4.19
mm

3500

8.00
mm

SMTSO-M1.6-2ET-U

M1.6 x 0.35

0.48
mm

2.41
mm

3.66
mm

2.00
mm

0.50
mm

2.50
mm

4.19
mm

2500

8.00
mm

SMTSO-M1.6-3ET-U

M1.6 x 0.35

0.48
mm

2.41
mm

3.66
mm

3.00
mm

0.50
mm

2.50
mm

4.19
mm

2000

8.00
mm

SMTSO-M2-2ET-U

M2 x 0.4

1.53
mm

3.60
mm

5.56
mm

2.00
mm

1.53
mm

3.73
mm

6.20
mm

1500

12.00
mm

SMTSO-M2-3ET-U

M2 x 0.4

1.53
mm

3.60
mm

5.56
mm

3.00
mm

1.53
mm

3.73
mm

6.20
mm

1000

12.00
mm

SMTSO-M2-4ET-U

M2 x 0.4

1.53
mm

3.60
mm

5.56
mm

4.00
mm

1.53
mm

3.73
mm

6.20
mm

900

12.00
mm

SMTSO-M2-6ET-U

M2 x 0.4

1.53
mm

3.60
mm

5.56
mm

6.00
mm

1.53
mm

3.73
mm

6.20
mm

650

12.00
mm

SMTSO-M2-8ET-U

M2 x 0.4

1.53
mm

3.60
mm

5.56
mm

8.00
mm

1.53
mm

3.73
mm

6.20
mm

375

16.00
mm

SMTSO-M2-10ET-U

M2 x 0.4

1.53
mm

3.60
mm

5.56
mm

10.00
mm

1.53
mm

3.73
mm

6.20
mm

300

16.00
mm

SMTSO-M25-2ET-U

M2.5 x 0.45

1.53
mm

4.09
mm

5.56
mm

2.00
mm

1.53
mm

4.22
mm

6.20
mm

1500

12.00
mm

SMTSO-M25-3ET-U

M2.5 x 0.45

1.53
mm

4.09
mm

5.56
mm

3.00
mm

1.53
mm

4.22
mm

6.20
mm

1000

12.00
mm

SMTSO-M25-4ET-U

M2.5 x 0.45

1.53
mm

4.09
mm

5.56
mm

4.00
mm

1.53
mm

4.22
mm

6.20
mm

900

12.00
mm

SMTSO-M25-6ET-U

M2.5 x 0.45

1.53
mm

4.09
mm

5.56
mm

6.00
mm

1.53
mm

4.22
mm

6.20
mm

650

12.00
mm

SMTSO-M25-8ET-U

M2.5 x 0.45

1.53
mm

4.09
mm

5.56
mm

8.00
mm

1.53
mm

4.22
mm

6.20
mm

375

16.00
mm

SMTSO-M25-10ET-U

M2.5 x 0.45

1.53
mm

4.09
mm

5.56
mm

10.00
mm

1.53
mm

4.22
mm

6.20
mm

300

16.00
mm

SMTSO-M3-2ET-U

M3 x 0.5

1.53
mm

4.09
mm

5.56
mm

2.00
mm

1.53
mm

4.22
mm

6.20
mm

1500

12.00
mm

SMTSO-M3-3ET-U

M3 x 0.5

1.53
mm

4.09
mm

5.56
mm

3.00
mm

1.53
mm

4.22
mm

6.20
mm

1000

12.00
mm

SMTSO-M3-4ET-U

M3 x 0.5

1.53
mm

4.09
mm

5.56
mm

4.00
mm

1.53
mm

4.22
mm

6.20
mm

900

12.00
mm

SMTSO-M3-6ET-U

M3 x 0.5

1.53
mm

4.09
mm

5.56
mm

6.00
mm

1.53
mm

4.22
mm

6.20
mm

650

12.00
mm

SMTSO-M3-8ET-U

M3 x 0.5

1.53
mm

4.09
mm

5.56
mm

8.00
mm

1.53
mm

4.22
mm

6.20
mm

375

16.00
mm

SMTSO-M3-10ET-U

M3 x 0.5

1.53
mm

4.09
mm

5.56
mm

10.00
mm

1.53
mm

4.22
mm

6.20
mm

300

16.00
mm

SMTSO-M35-2ET-U

M3.5 x 0.6

1.53
mm

5.28
mm

7.14
mm

2.00
mm

1.53
mm

5.41
mm

7.77
mm

1500

12.00
mm

SMTSO-M35-3ET-U

M3.5 x 0.6

1.53
mm

5.28
mm

7.14
mm

3.00
mm

1.53
mm

5.41
mm

7.77
mm

1000

12.00
mm

SMTSO-M35-4ET-U

M3.5 x 0.6

1.53
mm

5.28
mm

7.14
mm

4.00
mm

1.53
mm

5.41
mm

7.77
mm

900

12.00
mm

SMTSO-M35-6ET-U

M3.5 x 0.6

1.53
mm

5.28
mm

7.14
mm

6.00
mm

1.53
mm

5.41
mm

7.77
mm

650

12.00
mm

SMTSO-M35-8ET-U

M3.5 x 0.6

1.53
mm

5.28
mm

7.14
mm

8.00
mm

1.53
mm

5.41
mm

7.77
mm

375

16.00
mm

SMTSO-M35-10ET-U

M3.5 x 0.6

1.53
mm

5.28
mm

7.14
mm

10.00
mm

1.53
mm

5.41
mm

7.77
mm

300

16.00
mm

SMTSO-M4-2ET-U

M4 x 0.7

1.53
mm

6.22
mm

8.74
mm

2.00
mm

1.53
mm

6.35
mm

9.37
mm

1100

16.00
mm

SMTSO-M4-3ET-U

M4 x 0.7

1.53
mm

6.22
mm

8.74
mm

3.00
mm

1.53
mm

6.35
mm

9.37
mm

800

16.00
mm

SMTSO-M4-4ET-U

M4 x 0.7

1.53
mm

6.22
mm

8.74
mm

4.00
mm

1.53
mm

6.35
mm

9.37
mm

675

16.00
mm

SMTSO-M4-6ET-U

M4 x 0.7

1.53
mm

6.22
mm

8.74
mm

6.00
mm

1.53
mm

6.35
mm

9.37
mm

500

16.00
mm

SMTSO-M4-8ET-U

M4 x 0.7

1.53
mm

6.22
mm

8.74
mm

8.00
mm

1.53
mm

6.35
mm

9.37
mm

375

16.00
mm

SMTSO-M4-10ET-U

M4 x 0.7

1.53
mm

6.22
mm

8.74
mm

10.00
mm

1.53
mm

6.35
mm

9.37
mm

300

16.00
mm

UNICORP Electronic Hardware - Self Clinching Fasteners

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UNICORP is a leader in manufacturing stock and custom
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