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Concealed Head Studs  CHA-U

Self Clinching Fasteners  •  Studs for Sheet Metal
American Standard (Inches) & Metric Sizes
• Permanent mounting     • Used in metal sheets as thin as 0.062" /1.60 mm
• One side remains smooth
• Installed with hollow punch and solid anvil     • Head pressed into blind, milled hole
American Standard Sizes:   • Series CHA-U
Metric Sizes:   • Series CHA-U
Series  CHA-U
Series  CHA-U  /  American Standard Sizes
      • Sheet Hardness-  HRB 50 / HB 82 or Less
      • Material-  Aluminum
      • Finish-  None
Series CHA-U
American Standard Sizes
(SAE)
Part
Number
Thread "A"
Max.
"L"
Length
"E" "C"
Max.
Min.
Sheet
Thickness
Blind
Mounting
Hole
Diameter
Min.
Depth
of Blind
Hole
Min.
Distance
to Edge
Max.
Hole in
Attached
Parts
Mil-Spec
CHA-440-4-U 4-40 0.041" 0.250" 0.205" 0.171" 0.062" 0.172" 0.043" 0.156" 0.135" N/A
CHA-632-4-U 6-32 0.041" 0.250" 0.250" 0.212" 0.062" 0.213" 0.043" 0.188" 0.160" N/A
CHA-832-4-U 8-32 0.041" 0.250" 0.328" 0.289" 0.062" 0.290" 0.043" 0.219" 0.185" N/A
CHA-440-6-U 4-40 0.041" 0.375" 0.205" 0.171" 0.062" 0.172" 0.043" 0.156" 0.135" N/A
CHA-632-6-U 6-32 0.041" 0.375" 0.250" 0.212" 0.062" 0.213" 0.043" 0.188" 0.160" N/A
CHA-832-6-U 8-32 0.041" 0.375" 0.328" 0.289" 0.062" 0.290" 0.043" 0.219" 0.185" N/A
CHA-032-6-U 10-32 0.041" 0.375" 0.350" 0.311" 0.062" 0.312" 0.043" 0.250" 0.210" N/A
CHA-440-8-U 4-40 0.041" 0.500" 0.205" 0.171" 0.062" 0.172" 0.043" 0.156" 0.135" N/A
CHA-632-8-U 6-32 0.041" 0.500" 0.250" 0.212" 0.062" 0.213" 0.043" 0.188" 0.160" N/A
CHA-832-8-U 8-32 0.041" 0.500" 0.328" 0.289" 0.062" 0.290" 0.043" 0.219" 0.185" N/A
CHA-032-8-U 10-32 0.041" 0.500" 0.350" 0.311" 0.062" 0.312" 0.043" 0.250" 0.210" N/A
CHA-440-10-U 4-40 0.041" 0.625" 0.205" 0.171" 0.062" 0.172" 0.043" 0.156" 0.135" N/A
CHA-632-10-U 6-32 0.041" 0.625" 0.250" 0.212" 0.062" 0.213" 0.043" 0.188" 0.160" N/A
CHA-832-10-U 8-32 0.041" 0.625" 0.328" 0.289" 0.062" 0.290" 0.043" 0.219" 0.185" N/A
CHA-032-10-U 10-32 0.041" 0.625" 0.350" 0.311" 0.062" 0.312" 0.043" 0.250" 0.210" N/A
CHA-440-12-U 4-40 0.041" 0.750" 0.205" 0.171" 0.062" 0.172" 0.043" 0.156" 0.135" N/A
CHA-632-12-U 6-32 0.041" 0.750" 0.250" 0.212" 0.062" 0.213" 0.043" 0.188" 0.160" N/A
CHA-832-12-U 8-32 0.041" 0.750" 0.328" 0.289" 0.062" 0.290" 0.043" 0.219" 0.185" N/A
CHA-032-12-U 10-32 0.041" 0.750" 0.350" 0.311" 0.062" 0.312" 0.043" 0.250" 0.210" N/A
CHA-632-16-U 6-32 0.041" 1.000" 0.250" 0.212" 0.062" 0.213" 0.043" 0.188" 0.160" N/A
CHA-832-16-U 6-32 0.041" 1.000" 0.328" 0.289" 0.062" 0.290" 0.043" 0.219" 0.185" N/A
CHA-032-16-U 10-32 0.041" 1.000" 0.350" 0.311" 0.062" 0.312" 0.043" 0.250" 0.210" N/A
Series  CHA-U  /  Metric Sizes
      • Sheet Hardness-  HRB 50 / HB 82 or Less
      • Material-  Aluminum
      • Finish-  None
Series CHA-U
Metric Sizes
Part
Number
Thread "A"
Max.
"L"
Length
"E" "C"
Max.
Min.
Sheet
Thickness
Blind
Mounting
Hole
Diameter
Min.
Depth
of Blind
Hole
Min.
Distance
to Edge
Max.
Hole in
Attached
Parts
Mil-Spec
CHA-M3-6-U M3 x 0.5 1.04
mm
6.00
mm
5.21
mm
4.35
mm
1.60
mm
4.37
mm
1.10
mm
4.00
mm
3.60
mm
N/A
CHA-M4-6-U M4 x 0.7 1.04
mm
6.00
mm
8.33
mm
7.35
mm
1.60
mm
7.37
mm
1.10
mm
5.60
mm
4.60
mm
N/A
CHA-M3-8-U M3 x 0.5 1.04
mm
8.00
mm
5.21
mm
4.35
mm
1.60
mm
4.37
mm
1.10
mm
4.00
mm
3.60
mm
N/A
CHA-M4-8-U M4 x 0.7 1.04
mm
8.00
mm
8.33
mm
7.35
mm
1.60
mm
7.37
mm
1.10
mm
5.60
mm
4.60
mm
N/A
CHA-M3-10-U M3 x 0.5 1.04
mm
10.00
mm
5.21
mm
4.35
mm
1.60
mm
4.37
mm
1.10
mm
4.00
mm
3.60
mm
N/A
CHA-M4-10-U M4 x 0.7 1.04
mm
10.00
mm
8.33
mm
7.35
mm
1.60
mm
7.37
mm
1.10
mm
5.60
mm
4.60
mm
N/A
CHA-M5-10-U M5 x 0.8 1.04
mm
10.00
mm
8.89
mm
7.90
mm
1.60
mm
7.93
mm
1.10
mm
6.40
mm
5.60
mm
N/A
CHA-M3-12-U M3 x 0.5 1.04
mm
12.00
mm
5.21
mm
4.35
mm
1.60
mm
4.37
mm
1.10
mm
4.00
mm
3.60
mm
N/A
CHA-M4-12-U M4 x 0.7 1.04
mm
12.00
mm
8.33
mm
7.35
mm
1.60
mm
7.37
mm
1.10
mm
5.60
mm
4.60
mm
N/A
CHA-M5-12-U M5 x 0.8 1.04
mm
12.00
mm
8.89
mm
7.90
mm
1.60
mm
7.93
mm
1.10
mm
6.40
mm
5.60
mm
N/A
CHA-M3-16-U M3 x 0.5 1.04
mm
16.00
mm
5.21
mm
4.35
mm
1.60
mm
4.37
mm
1.10
mm
4.00
mm
3.60
mm
N/A
CHA-M4-16-U M4 x 0.7 1.04
mm
16.00
mm
8.33
mm
7.35
mm
1.60
mm
7.37
mm
1.10
mm
5.60
mm
4.60
mm
N/A
CHA-M5-16-U M5 x 0.8 1.04
mm
16.00
mm
8.89
mm
7.90
mm
1.60
mm
7.93
mm
1.10
mm
6.40
mm
5.60
mm
N/A
CHA-M3-20-U M3 x 0.5 1.04
mm
20.00
mm
5.21
mm
4.35
mm
1.60
mm
4.37
mm
1.10
mm
4.00
mm
3.60
mm
N/A
CHA-M4-20-U M4 x 0.7 1.04
mm
20.00
mm
8.33
mm
7.35
mm
1.60
mm
7.37
mm
1.10
mm
5.60
mm
4.60
mm
N/A
CHA-M5-20-U M5 x 0.8 1.04
mm
20.00
mm
8.89
mm
7.90
mm
1.60
mm
7.93
mm
1.10
mm
6.40
mm
5.60
mm
N/A
CHA-M4-25-U M4 x 0.7 1.04
mm
25.00
mm
8.33
mm
7.35
mm
1.60
mm
7.37
mm
1.10
mm
5.60
mm
4.60
mm
N/A
CHA-M5-25-U M5 x 0.8 1.04
mm
25.00
mm
8.89
mm
7.90
mm
1.60
mm
7.93
mm
1.10
mm
6.40
mm
5.60
mm
N/A

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