CSS Concealed Head Standoffs

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Concealed Head Standoffs CSS-U

Self Clinching Fasteners • Standoffs For Sheet Metal
American Standard (Inches) & Metric Sizes

UNICORP Electronic Hardware Self-Clinching Fasteners - Concealed Head CSS

• Self-clinching     • Installed quickly and permanently in metal panels with hollow punch and solid anvil
• Minimum sheet thickness of 0.062" /1.60 mm     • Requires milled blind hole
• Fastener head is locked into place     • Concealed head leaves one side smooth

American Standard Sizes: • Series CSS-U

Metric Sizes: • Series CSS-U

Series CSS-U

Series CSS-U / American Standard Sizes

• Head Shape- Round • "A"- 0.041" • Shank- Short • Min. Sheet Thickness- 0.062" • Min. Depth of Blind Hole- 0.043" • Sheet Hardness- HRB 70 / HB 125 or Less • Material- 300 Series Stainless Steel • Finish- Passivated per ASTM A380
	Series CSS-U American Standard Sizes (SAE)

Part
Number

Thread

"H"
Nom.

"L"
Body
Length

"C"
Max.

"F" Full
Thread
Min. Depth

Style

Blind
Mounting
Hole
Diameter

"B"
Barrel
O.D.

Min.
Distance
to Edge

Mil-Spec

CSS-440-3-U

4-40

1/4"

0.187"

0.212"

0.188"

0.213"

0.165"

0.188"

N/A

CSS-440-4-U

4-40

1/4"

0.250"

0.212"

0.188"

0.213"

0.165"

0.188"

N/A

CSS-440-5-U

4-40

1/4"

0.312"

0.212"

0.188"

0.213"

0.165"

0.188"

N/A

CSS-440-6-U

4-40

1/4"

0.375"

0.212"

0.188"

0.213"

0.165"

0.188"

N/A

CSS-440-8-U

4-40

1/4"

0.500"

0.212"

0.188"

0.213"

0.165"

0.188"

N/A

CSS-440-10-U

4-40

1/4"

0.625"

0.212"

0.188"

0.213"

0.165"

0.188"

N/A

CSS-440-12-U

4-40

1/4"

0.750"

0.212"

0.188"

0.213"

0.165"

0.188"

N/A

CSS-440-16-U

4-40

1/4"

1.000"

0.212"

0.188"

0.213"

0.165"

0.188"

N/A

CSS-632-3-U

6-32

5/16"

0.187"

0.289"

0.250"

0.290"

0.213"

0.219"

N/A

CSS-632-4-U

6-32

5/16"

0.250"

0.289"

0.250"

0.290"

0.213"

0.219"

N/A

CSS-632-5-U

6-32

5/16"

0.312"

0.289"

0.250"

0.290"

0.213"

0.219"

N/A

CSS-632-6-U

6-32

5/16"

0.375"

0.289"

0.250"

0.290"

0.213"

0.219"

N/A

CSS-632-8-U

6-32

5/16"

0.500"

0.289"

0.250"

0.290"

0.213"

0.219"

N/A

CSS-632-10-U

6-32

5/16"

0.625"

0.289"

0.250"

0.290"

0.213"

0.219"

N/A

CSS-632-12-U

6-32

5/16"

0.750"

0.289"

0.250"

0.290"

0.213"

0.219"

N/A

CSS-632-16-U

6-32

5/16"

1.000"

0.289"

0.250"

0.290"

0.213"

0.219"

N/A

CSS-832-3-U

8-32

11/32"

0.187"

0.311"

0.250"

0.312"

0.245"

0.250"

N/A

CSS-832-4-U

8-32

11/32"

0.250"

0.311"

0.250"

0.312"

0.245"

0.250"

N/A

CSS-832-5-U

8-32

11/32"

0.312"

0.311"

0.250"

0.312"

0.245"

0.250"

N/A

CSS-832-6-U

8-32

11/32"

0.375"

0.311"

0.250"

0.312"

0.245"

0.250"

N/A

CSS-832-8-U

8-32

11/32"

0.500"

0.311"

0.250"

0.312"

0.245"

0.250"

N/A

CSS-832-10-U

8-32

11/32"

0.625"

0.311"

0.250"

0.312"

0.245"

0.250"

N/A

CSS-832-12-U

8-32

11/32"

0.750"

0.311"

0.250"

0.312"

0.245"

0.250"

N/A

CSS-832-16-U

8-32

11/32"

1.000"

0.311"

0.250"

0.312"

0.245"

0.250"

N/A

CSS-032-3-U

10-32

3/8"

0.187"

0.343"

0.375"

0.344"

0.290"

0.281"

N/A

CSS-032-4-U

10-32

3/8"

0.250"

0.343"

0.375"

0.344"

0.290"

0.281"

N/A

CSS-032-5-U

10-32

3/8"

0.312"

0.343"

0.375"

0.344"

0.290"

0.281"

N/A

CSS-032-6-U

10-32

3/8"

0.375"

0.343"

0.375"

0.344"

0.290"

0.281"

N/A

CSS-032-8-U

10-32

3/8"

0.500"

0.343"

0.375"

0.344"

0.290"

0.281"

N/A

CSS-032-10-U

10-32

3/8"

0.625"

0.343"

0.375"

0.344"

0.290"

0.281"

N/A

CSS-032-12-U

10-32

3/8"

0.750"

0.343"

0.375"

0.344"

0.290"

0.281"

N/A

CSS-032-16-U

10-32

3/8"

1.000"

0.343"

0.375"

0.344"

0.290"

0.281"

N/A

CSS-0420-3-U

1/4-20

7/16"

0.187"

0.389"

0.375"

0.390"

0.354"

0.375"

N/A

CSS-0420-4-U

1/4-20

7/16"

0.250"

0.389"

0.375"

0.390"

0.354"

0.375"

N/A

CSS-0420-5-U

1/4-20

7/16"

0.312"

0.389"

0.375"

0.390"

0.354"

0.375"

N/A

CSS-0420-6-U

1/4-20

7/16"

0.375"

0.389"

0.375"

0.390"

0.354"

0.375"

N/A

CSS-0420-8-U

1/4-20

7/16"

0.500"

0.389"

0.375"

0.390"

0.354"

0.375"

N/A

CSS-0420-10-U

1/4-20

7/16"

0.625"

0.389"

0.375"

0.390"

0.354"

0.375"

N/A

CSS-0420-12-U

1/4-20

7/16"

0.750"

0.389"

0.375"

0.390"

0.354"

0.375"

N/A

CSS-0420-16-U

1/4-20

7/16"

1.000"

0.389"

0.375"

0.390"

0.354"

0.375"

N/A

Series CSS-U / Metric Sizes

• Head Shape- Hex • "A"- 1.04 mm • Shank- Short • Min. Sheet Thickness- 1.60 mm • Min. Depth of Blind Hole- 1.10 mm • Sheet Hardness- HRB 70 / HB 125 or Less • Material- 300 Series Stainless Steel • Finish- Passivated per ASTM A380
	Series CSS-U Metric Sizes

Part
Number

Thread

"H"
Nom.

"L"
Body
Length

"C"
Max.

"F" Full
Thread
Min. Depth

Style

Blind
Mounting
Hole
Diameter

"B"
Barrel
O.D.

Min.
Distance
to Edge

Mil-Spec

CSS-M3-4-U

M3 x 0.5

6.35
mm

4.00
mm

5.39
mm

5.00
mm

5.41
mm

4.20
mm

4.80
mm

N/A

CSS-M3-6-U

M3 x 0.5

6.35
mm

6.00
mm

5.39
mm

5.00
mm

5.41
mm

4.20
mm

4.80
mm

N/A

CSS-M3-8-U

M3 x 0.5

6.35
mm

8.00
mm

5.39
mm

5.00
mm

5.41
mm

4.20
mm

4.80
mm

N/A

CSS-M3-10-U

M3 x 0.5

6.35
mm

10.00
mm

5.39
mm

5.00
mm

5.41
mm

4.20
mm

4.80
mm

N/A

CSS-M3-12-U

M3 x 0.5

6.35
mm

12.00
mm

5.39
mm

5.00
mm

5.41
mm

4.20
mm

4.80
mm

N/A

CSS-M3-16-U

M3 x 0.5

6.35
mm

16.00
mm

5.39
mm

5.00
mm

5.41
mm

4.20
mm

4.80
mm

N/A

CSS-M3-20-U

M3 x 0.5

6.35
mm

20.00
mm

5.39
mm

5.00
mm

5.41
mm

4.20
mm

4.80
mm

N/A

CSS-M3-25-U

M3 x 0.5

6.35
mm

25.00
mm

5.39
mm

5.00
mm

5.41
mm

4.20
mm

4.80
mm

N/A

CSS-M4-4-U

M4 x 0.7

8.74
mm

4.00
mm

7.90
mm

6.50
mm

7.92
mm

6.23
mm

6.40
mm

N/A

CSS-M4-6-U

M4 x 0.7

8.74
mm

6.00
mm

7.90
mm

6.50
mm

7.92
mm

6.23
mm

6.40
mm

N/A

CSS-M4-8-U

M4 x 0.7

8.74
mm

8.00
mm

7.90
mm

6.50
mm

7.92
mm

6.23
mm

6.40
mm

N/A

CSS-M4-10-U

M4 x 0.7

8.74
mm

10.00
mm

7.90
mm

6.50
mm

7.92
mm

6.23
mm

6.40
mm

N/A

CSS-M4-12-U

M4 x 0.7

8.74
mm

12.00
mm

7.90
mm

6.50
mm

7.92
mm

6.23
mm

6.40
mm

N/A

CSS-M4-16-U

M4 x 0.7

8.74
mm

16.00
mm

7.90
mm

6.50
mm

7.92
mm

6.23
mm

6.40
mm

N/A

CSS-M4-20-U

M4 x 0.7

8.74
mm

20.00
mm

7.90
mm

6.50
mm

7.92
mm

6.23
mm

6.40
mm

N/A

CSS-M4-25-U

M4 x 0.7

8.74
mm

25.00
mm

7.90
mm

6.50
mm

7.92
mm

6.23
mm

6.40
mm

N/A

CSS-M5-4-U

M5 x 0.8

9.53
mm

4.00
mm

8.72
mm

9.60
mm

8.74
mm

7.37
mm

7.20
mm

N/A

CSS-M5-6-U

M5 x 0.8

9.53
mm

6.00
mm

8.72
mm

9.60
mm

8.74
mm

7.37
mm

7.20
mm

N/A

CSS-M5-8-U

M5 x 0.8

9.53
mm

8.00
mm

8.72
mm

9.60
mm

8.74
mm

7.37
mm

7.20
mm

N/A

CSS-M5-10-U

M5 x 0.8

9.53
mm

10.00
mm

8.72
mm

9.60
mm

8.74
mm

7.37
mm

7.20
mm

N/A

CSS-M5-12-U

M5 x 0.8

9.53
mm

12.00
mm

8.72
mm

9.60
mm

8.74
mm

7.37
mm

7.20
mm

N/A

CSS-M5-16-U

M5 x 0.8

9.53
mm

16.00
mm

8.72
mm

9.60
mm

8.74
mm

7.37
mm

7.20
mm

N/A

CSS-M5-20-U

M5 x 0.8

9.53
mm

20.00
mm

8.72
mm

9.60
mm

8.74
mm

7.37
mm

7.20
mm

N/A

CSS-M5-25-U

M5 x 0.8

9.53
mm

25.00
mm

8.72
mm

9.60
mm

8.74
mm

7.37
mm

7.20
mm

N/A

UNICORP Electronic Hardware - Self Clinching Fasteners

Phone: 973-674-1700 Toll Free: 1-800-526-1389 Fax: 973-674-3803

UNICORP is a leader in manufacturing stock and custom
electronic hardware, handles and precision fasteners used by leading companies
in nearly every industry since 1971.

291 Cleveland St, Orange, New Jersey 07050  USA
Mailing Address:  P.O. Box 280, Orange, New Jersey 07051-0280  USA

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