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Concealed Head Studs  CHC-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 CHC-U
Metric Sizes:   • Series CHC-U
Series  CHC-U
Series  CHC-U  /  American Standard Sizes
      • Sheet Hardness-  HRB 70 / HB 125 or Less
      • Material-  300 Series Stainless Steel
      • Finish-  Passivated per ASTM A380

Series CHC-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
CHC-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
CHC-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
CHC-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
CHC-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
CHC-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
CHC-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
CHC-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
CHC-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
CHC-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
CHC-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
CHC-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
CHC-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
CHC-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
CHC-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
CHC-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
CHC-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
CHC-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
CHC-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
CHC-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
CHC-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
CHC-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
CHC-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  CHC-U  /  Metric Sizes
      • Sheet Hardness-  HRB 70 / HB 125 or Less
      • Material-  300 Series Stainless Steel
      • Finish-  Passivated per ASTM A380

Series CHC-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
CHC-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
CHC-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
CHC-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
CHC-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
CHC-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
CHC-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
CHC-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
CHC-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
CHC-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
CHC-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
CHC-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
CHC-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
CHC-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
CHC-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
CHC-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
CHC-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
CHC-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
CHC-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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