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Concealed Head Standoffs  CSOS-U

Self Clinching Fasteners  •  Standoffs For Sheet Metal
American Standard (Inches) & Metric Sizes
• 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 CSOS-U
Metric Sizes:   • Series CSOS-U
Series  CSOS-U
Series  CSOS-U  /  American Standard Sizes
      • Head Shape-  Hex
      • "A"-  0.072"
      • Shank-  Long
      • Min. Sheet Thickness-  0.093"
      • Min. Depth of Blind Hole-  0.075"
      • Sheet Hardness-  HRB 70 / HB 125 or Less
      • Material-  300 Series Stainless Steel
      • Finish-  Passivated per ASTM A380

Series CSOS-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
CSOS-440-3-U 4-40 1/4" 0.187" 0.212" 0.188" #1 0.213" 0.165" 0.188" N/A
CSOS-440-4-U 4-40 1/4" 0.250" 0.212" 0.188" #2 0.213" 0.165" 0.188" N/A
CSOS-440-5-U 4-40 1/4" 0.312" 0.212" 0.188" #2 0.213" 0.165" 0.188" N/A
CSOS-440-6-U 4-40 1/4" 0.375" 0.212" 0.188" #2 0.213" 0.165" 0.188" N/A
CSOS-440-8-U 4-40 1/4" 0.500" 0.212" 0.188" #3 0.213" 0.165" 0.188" N/A
CSOS-440-10-U 4-40 1/4" 0.625" 0.212" 0.188" #3 0.213" 0.165" 0.188" N/A
CSOS-440-12-U 4-40 1/4" 0.750" 0.212" 0.188" #3 0.213" 0.165" 0.188" N/A
CSOS-440-16-U 4-40 1/4" 1.000" 0.212" 0.188" #3 0.213" 0.165" 0.188" N/A
 
CSOS-632-3-U 6-32 5/16" 0.187" 0.289" 0.250" #1 0.290" 0.213" 0.219" N/A
CSOS-632-4-U 6-32 5/16" 0.250" 0.289" 0.250" #1 0.290" 0.213" 0.219" N/A
CSOS-632-5-U 6-32 5/16" 0.312" 0.289" 0.250" #2 0.290" 0.213" 0.219" N/A
CSOS-632-6-U 6-32 5/16" 0.375" 0.289" 0.250" #2 0.290" 0.213" 0.219" N/A
CSOS-632-8-U 6-32 5/16" 0.500" 0.289" 0.250" #3 0.290" 0.213" 0.219" N/A
CSOS-632-10-U 6-32 5/16" 0.625" 0.289" 0.250" #3 0.290" 0.213" 0.219" N/A
CSOS-632-12-U 6-32 5/16" 0.750" 0.289" 0.250" #3 0.290" 0.213" 0.219" N/A
CSOS-632-16-U 6-32 5/16" 1.000" 0.289" 0.250" #3 0.290" 0.213" 0.219" N/A
 
CSOS-832-3-U 8-32 11/32" 0.187" 0.311" 0.250" #1 0.312" 0.245" 0.250" N/A
CSOS-832-4-U 8-32 11/32" 0.250" 0.311" 0.250" #1 0.312" 0.245" 0.250" N/A
CSOS-832-5-U 8-32 11/32" 0.312" 0.311" 0.250" #2 0.312" 0.245" 0.250" N/A
CSOS-832-6-U 8-32 11/32" 0.375" 0.311" 0.250" #2 0.312" 0.245" 0.250" N/A
CSOS-832-8-U 8-32 11/32" 0.500" 0.311" 0.250" #3 0.312" 0.245" 0.250" N/A
CSOS-832-10-U 8-32 11/32" 0.625" 0.311" 0.250" #3 0.312" 0.245" 0.250" N/A
CSOS-832-12-U 8-32 11/32" 0.750" 0.311" 0.250" #3 0.312" 0.245" 0.250" N/A
CSOS-832-16-U 8-32 11/32" 1.000" 0.311" 0.250" #3 0.312" 0.245" 0.250" N/A
 
CSOS-032-3-U 10-32 3/8" 0.187" 0.343" 0.375" #1 0.344" 0.290" 0.281" N/A
CSOS-032-4-U 10-32 3/8" 0.250" 0.343" 0.375" #1 0.344" 0.290" 0.281" N/A
CSOS-032-5-U 10-32 3/8" 0.312" 0.343" 0.375" #1 0.344" 0.290" 0.281" N/A
CSOS-032-6-U 10-32 3/8" 0.375" 0.343" 0.375" #1 0.344" 0.290" 0.281" N/A
CSOS-032-8-U 10-32 3/8" 0.500" 0.343" 0.375" #2 0.344" 0.290" 0.281" N/A
CSOS-032-10-U 10-32 3/8" 0.625" 0.343" 0.375" #3 0.344" 0.290" 0.281" N/A
CSOS-032-12-U 10-32 3/8" 0.750" 0.343" 0.375" #3 0.344" 0.290" 0.281" N/A
CSOS-032-16-U 10-32 3/8" 1.000" 0.343" 0.375" #3 0.344" 0.290" 0.281" N/A
 
CSOS-0420-3-U 1/4-20 7/16" 0.187" 0.389" 0.375" #1 0.390" 0.354" 0.375" N/A
CSOS-0420-4-U 1/4-20 7/16" 0.250" 0.389" 0.375" #1 0.390" 0.354" 0.375" N/A
CSOS-0420-5-U 1/4-20 7/16" 0.312" 0.389" 0.375" #1 0.390" 0.354" 0.375" N/A
CSOS-0420-6-U 1/4-20 7/16" 0.375" 0.389" 0.375" #1 0.390" 0.354" 0.375" N/A
CSOS-0420-8-U 1/4-20 7/16" 0.500" 0.389" 0.375" #2 0.390" 0.354" 0.375" N/A
CSOS-0420-10-U 1/4-20 7/16" 0.625" 0.389" 0.375" #2 0.390" 0.354" 0.375" N/A
CSOS-0420-12-U 1/4-20 7/16" 0.750" 0.389" 0.375" #3 0.390" 0.354" 0.375" N/A
CSOS-0420-16-U 1/4-20 7/16" 1.000" 0.389" 0.375" #3 0.390" 0.354" 0.375" N/A
Series  CSOS-U  /  Metric Sizes
      • Head Shape-  Hex
      • "A"-  1.83 mm
      • Shank-  Long
      • Min. Sheet Thickness-  2.40 mm
      • Min. Depth of Blind Hole-  1.91 mm
      • Sheet Hardness-  HRB 70 / HB 125 or Less
      • Material-  300 Series Stainless Steel
      • Finish-  Passivated per ASTM A380

Series CSOS-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
CSOS-M3-4-U M3 x 0.5 6.35
mm
4.00
mm
5.39
mm
5.00
mm
#1 5.41
mm
4.20
mm
4.80
mm
N/A
CSOS-M3-6-U M3 x 0.5 6.35
mm
6.00
mm
5.39
mm
5.00
mm
#1 5.41
mm
4.20
mm
4.80
mm
N/A
CSOS-M3-8-U M3 x 0.5 6.35
mm
8.00
mm
5.39
mm
5.00
mm
#3 5.41
mm
4.20
mm
4.80
mm
N/A
CSOS-M3-10-U M3 x 0.5 6.35
mm
10.00
mm
5.39
mm
5.00
mm
#3 5.41
mm
4.20
mm
4.80
mm
N/A
CSOS-M3-12-U M3 x 0.5 6.35
mm
12.00
mm
5.39
mm
5.00
mm
#3 5.41
mm
4.20
mm
4.80
mm
N/A
CSOS-M3-16-U M3 x 0.5 6.35
mm
16.00
mm
5.39
mm
5.00
mm
#3 5.41
mm
4.20
mm
4.80
mm
N/A
CSOS-M3-20-U M3 x 0.5 6.35
mm
20.00
mm
5.39
mm
5.00
mm
#3 5.41
mm
4.20
mm
4.80
mm
N/A
CSOS-M3-25-U M3 x 0.5 6.35
mm
25.00
mm
5.39
mm
5.00
mm
#3 5.41
mm
4.20
mm
4.80
mm
N/A
 
CSOS-M4-4-U M4 x 0.7 8.74
mm
4.00
mm
7.90
mm
6.50
mm
#1 7.92
mm
6.23
mm
6.40
mm
N/A
CSOS-M4-6-U M4 x 0.7 8.74
mm
6.00
mm
7.90
mm
6.50
mm
#1 7.92
mm
6.23
mm
6.40
mm
N/A
CSOS-M4-8-U M4 x 0.7 8.74
mm
8.00
mm
7.90
mm
6.50
mm
#2 7.92
mm
6.23
mm
6.40
mm
N/A
CSOS-M4-10-U M4 x 0.7 8.74
mm
10.00
mm
7.90
mm
6.50
mm
#3 7.92
mm
6.23
mm
6.40
mm
N/A
CSOS-M4-12-U M4 x 0.7 8.74
mm
12.00
mm
7.90
mm
6.50
mm
#3 7.92
mm
6.23
mm
6.40
mm
N/A
CSOS-M4-16-U M4 x 0.7 8.74
mm
16.00
mm
7.90
mm
6.50
mm
#3 7.92
mm
6.23
mm
6.40
mm
N/A
CSOS-M4-20-U M4 x 0.7 8.74
mm
20.00
mm
7.90
mm
6.50
mm
#3 7.92
mm
6.23
mm
6.40
mm
N/A
CSOS-M4-25-U M4 x 0.7 8.74
mm
25.00
mm
7.90
mm
6.50
mm
#3 7.92
mm
6.23
mm
6.40
mm
N/A
 
CSOS-M5-4-U M5 x 0.8 9.53
mm
4.00
mm
8.72
mm
9.60
mm
#1 8.74
mm
7.37
mm
7.20
mm
N/A
CSOS-M5-6-U M5 x 0.8 9.53
mm
6.00
mm
8.72
mm
9.60
mm
#1 8.74
mm
7.37
mm
7.20
mm
N/A
CSOS-M5-8-U M5 x 0.8 9.53
mm
8.00
mm
8.72
mm
9.60
mm
#1 8.74
mm
7.37
mm
7.20
mm
N/A
CSOS-M5-10-U M5 x 0.8 9.53
mm
10.00
mm
8.72
mm
9.60
mm
#2 8.74
mm
7.37
mm
7.20
mm
N/A
CSOS-M5-12-U M5 x 0.8 9.53
mm
12.00
mm
8.72
mm
9.60
mm
#2 8.74
mm
7.37
mm
7.20
mm
N/A
CSOS-M5-16-U M5 x 0.8 9.53
mm
16.00
mm
8.72
mm
9.60
mm
#3 8.74
mm
7.37
mm
7.20
mm
N/A
CSOS-M5-20-U M5 x 0.8 9.53
mm
20.00
mm
8.72
mm
9.60
mm
#3 8.74
mm
7.37
mm
7.20
mm
N/A
CSOS-M5-25-U M5 x 0.8 9.53
mm
25.00
mm
8.72
mm
9.60
mm
#3 8.74
mm
7.37
mm
7.20
mm
N/A
 
CSOS-M6-4-U M6 x 1.0 11.11
mm
4.00
mm
9.89
mm
9.60
mm
#1 9.90
mm
9.00
mm
9.50
mm
N/A
CSOS-M6-6-U M6 x 1.0 11.11
mm
6.00
mm
9.89
mm
9.60
mm
#1 9.90
mm
9.00
mm
9.50
mm
N/A
CSOS-M6-8-U M6 x 1.0 11.11
mm
8.00
mm
9.89
mm
9.60
mm
#1 9.90
mm
9.00
mm
9.50
mm
N/A
CSOS-M6-10-U M6 x 1.0 11.11
mm
10.00
mm
9.89
mm
9.60
mm
#2 9.90
mm
9.00
mm
9.50
mm
N/A
CSOS-M6-12-U M6 x 1.0 11.11
mm
12.00
mm
9.89
mm
9.60
mm
#2 9.90
mm
9.00
mm
9.50
mm
N/A
CSOS-M6-16-U M6 x 1.0 11.11
mm
16.00
mm
9.89
mm
9.60
mm
#3 9.90
mm
9.00
mm
9.50
mm
N/A
CSOS-M6-20-U M6 x 1.0 11.11
mm
20.00
mm
9.89
mm
9.60
mm
#3 9.90
mm
9.00
mm
9.50
mm
N/A
CSOS-M6-25-U M6 x 1.0 11.11
mm
25.00
mm
9.89
mm
9.60
mm
#3 9.90
mm
9.00
mm
9.50
mm
N/A

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electronic hardware, handles and precision fasteners used by leading companies
in nearly every industry since 1971.


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