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High Strength Studs  HFH-U

Self Clinching Fasteners  •  Studs for Sheet Metal
American Standard (Inches) & Metric Sizes
• Self-clinching    • Non-Flush    • Strong load bearing threads    • Easier installation than weld studs    • Greater torque-out
• Improved pull-through resistance    • HFH-U and HFHS-U best used in steel or aluminum sheets
• HFHB-U best used in copper sheets    • Installed quickly and easily by squeezing into place
• Minimum sheet thickness of 0.050" /1.30 mm
American Standard Sizes:   • Series HFH-U (Zinc Clear)    • Series HFH-U (Zinc Yellow)   
Metric Sizes:   • Series HFH-U (Zinc Clear)    • Series HFH-U (Zinc Yellow)
Series  HFH-U
Series  HFH-U  (Zinc Clear)   /  American Standard Sizes
      • Head Shape-  Round
      • Thread Strength-  120 ksi
      • Sheet Hardness-  HRB 85 / HB 165 or Less
      • Material-  Heat-Treated Carbon Steel
      • Finish-  Zinc Clear Plated per ASTM B633
      • Mil-Spec-  N/A
Series HFH-U
American Standard Sizes
(SAE)
Part
Number
Thread "S"
Max.
"H"
Head
Diameter
"L"
Overall
Length
"T"
Max.
Min.
Sheet
Thickness
Hole
Size in
Sheet
Max.
Hole in
Attached
Parts
Min.
Distance
to Edge
HFH-032-8ZI-U 10-32 0.105" 0.300" 0.500" 0.040" 0.050" 0.190" 0.250" 0.415"
HFH-032-12ZI-U 10-32 0.105" 0.300" 0.750" 0.040" 0.050" 0.190" 0.250" 0.415"
HFH-032-16ZI-U 10-32 0.105" 0.300" 1.000" 0.040" 0.050" 0.190" 0.250" 0.415"
HFH-032-20ZI-U 10-32 0.105" 0.300" 1.250" 0.040" 0.050" 0.190" 0.250" 0.415"
HFH-032-24ZI-U 10-32 0.105" 0.300" 1.500" 0.040" 0.050" 0.190" 0.250" 0.415"
HFH-032-28ZI-U 10-32 0.105" 0.300" 1.750" 0.040" 0.050" 0.190" 0.250" 0.415"
HFH-032-32ZI-U 10-32 0.105" 0.300" 2.000" 0.040" 0.050" 0.190" 0.250" 0.415"
 
HFH-0420-8ZI-U 1/4-20 0.125" 0.380" 0.500" 0.050" 0.060" 0.250" 0.312" 0.460"
HFH-0420-12ZI-U 1/4-20 0.125" 0.380" 0.750" 0.050" 0.060" 0.250" 0.312" 0.460"
HFH-0420-16ZI-U 1/4-20 0.125" 0.380" 1.000" 0.050" 0.060" 0.250" 0.312" 0.460"
HFH-0420-20ZI-U 1/4-20 0.125" 0.380" 1.250" 0.050" 0.060" 0.250" 0.312" 0.460"
HFH-0420-24ZI-U 1/4-20 0.125" 0.380" 1.500" 0.050" 0.060" 0.250" 0.312" 0.460"
HFH-0420-28ZI-U 1/4-20 0.125" 0.380" 1.750" 0.050" 0.060" 0.250" 0.312" 0.460"
HFH-0420-32ZI-U 1/4-20 0.125" 0.380" 2.000" 0.050" 0.060" 0.250" 0.312" 0.460"
 
HFH-0518-8ZI-U 5/16-18 0.140" 0.480" 0.500" 0.070" 0.075" 0.312" 0.375" 0.500"
HFH-0518-12ZI-U 5/16-18 0.140" 0.480" 0.750" 0.070" 0.075" 0.312" 0.375" 0.500"
HFH-0518-16ZI-U 5/16-18 0.140" 0.480" 1.000" 0.070" 0.075" 0.312" 0.375" 0.500"
HFH-0518-20ZI-U 5/16-18 0.140" 0.480" 1.250" 0.070" 0.075" 0.312" 0.375" 0.500"
HFH-0518-24ZI-U 5/16-18 0.140" 0.480" 1.500" 0.070" 0.075" 0.312" 0.375" 0.500"
HFH-0518-28ZI-U 5/16-18 0.140" 0.480" 1.750" 0.070" 0.075" 0.312" 0.375" 0.500"
HFH-0518-32ZI-U 5/16-18 0.140" 0.480" 2.000" 0.070" 0.075" 0.312" 0.375" 0.500"
 
HFH-0616-12ZI-U 3/8-16 0.155" 0.580" 0.750" 0.085" 0.090" 0.375" 0.437" 0.530"
HFH-0616-16ZI-U 3/8-16 0.155" 0.580" 1.000" 0.085" 0.090" 0.375" 0.437" 0.530"
HFH-0616-20ZI-U 3/8-16 0.155" 0.580" 1.250" 0.085" 0.090" 0.375" 0.437" 0.530"
HFH-0616-24ZI-U 3/8-16 0.155" 0.580" 1.500" 0.085" 0.090" 0.375" 0.437" 0.530"
HFH-0616-28ZI-U 3/8-16 0.155" 0.580" 1.750" 0.085" 0.090" 0.375" 0.437" 0.530"
HFH-0616-32ZI-U 3/8-16 0.155" 0.580" 2.000" 0.085" 0.090" 0.375" 0.437" 0.530"
Series  HFH-U  (Zinc Clear)  /  Metric Sizes
      • Head Shape-  Round
      • Thread Strength-  900 mPa
      • Sheet Hardness-  HRB 85 / HB 165 or Less
      • Material-  Heat-Treated Carbon Steel
      • Finish-  Zinc Clear Plated per ASTM B633
      • Mil-Spec-  N/A
Series HFH-U
Metric Sizes
Part
Number
Thread "S"
Max.
"H"
Head
Diameter
"L"
Overall
Length
"T"
Max.
Min.
Sheet
Thickness
Hole
Size in
Sheet
Max.
Hole in
Attached
Parts
Min.
Distance
to Edge
HFH-M5-15ZI-U M5 x 0.8 2.70
mm
7.80
mm
15.00
mm
1.14
mm
1.30
mm
5.00
mm
6.50
mm
10.70
mm
HFH-M5-20ZI-U M5 x 0.8 2.70
mm
7.80
mm
20.00
mm
1.14
mm
1.30
mm
5.00
mm
6.50
mm
10.70
mm
HFH-M5-25ZI-U M5 x 0.8 2.70
mm
7.80
mm
25.00
mm
1.14
mm
1.30
mm
5.00
mm
6.50
mm
10.70
mm
HFH-M5-30ZI-U M5 x 0.8 2.70
mm
7.80
mm
30.00
mm
1.14
mm
1.30
mm
5.00
mm
6.50
mm
10.70
mm
HFH-M5-35ZI-U M5 x 0.8 2.70
mm
7.80
mm
35.00
mm
1.14
mm
1.30
mm
5.00
mm
6.50
mm
10.70
mm
HFH-M5-40ZI-U M5 x 0.8 2.70
mm
7.80
mm
40.00
mm
1.14
mm
1.30
mm
5.00
mm
6.50
mm
10.70
mm
HFH-M5-50ZI-U M5 x 0.8 2.70
mm
7.80
mm
50.00
mm
1.14
mm
1.30
mm
5.00
mm
6.50
mm
10.70
mm
 
HFH-M6-15ZI-U M6 x 1.0 2.80
mm
9.40
mm
15.00
mm
1.27
mm
1.50
mm
6.00
mm
7.50
mm
11.50
mm
HFH-M6-20ZI-U M6 x 1.0 2.80
mm
9.40
mm
20.00
mm
1.27
mm
1.50
mm
6.00
mm
7.50
mm
11.50
mm
HFH-M6-25ZI-U M6 x 1.0 2.80
mm
9.40
mm
25.00
mm
1.27
mm
1.50
mm
6.00
mm
7.50
mm
11.50
mm
HFH-M6-30ZI-U M6 x 1.0 2.80
mm
9.40
mm
30.00
mm
1.27
mm
1.50
mm
6.00
mm
7.50
mm
11.50
mm
HFH-M6-35ZI-U M6 x 1.0 2.80
mm
9.40
mm
35.00
mm
1.27
mm
1.50
mm
6.00
mm
7.50
mm
11.50
mm
HFH-M6-40ZI-U M6 x 1.0 2.80
mm
9.40
mm
40.00
mm
1.27
mm
1.50
mm
6.00
mm
7.50
mm
11.50
mm
HFH-M6-50ZI-U M6 x 1.0 2.80
mm
9.40
mm
50.00
mm
1.27
mm
1.50
mm
6.00
mm
7.50
mm
11.50
mm
 
HFH-M8-15ZI-U M8 x 1.25 3.50
mm
12.50
mm
15.00
mm
1.78
mm
2.00
mm
8.00
mm
9.50
mm
12.70
mm
HFH-M8-20ZI-U M8 x 1.25 3.50
mm
12.50
mm
20.00
mm
1.78
mm
2.00
mm
8.00
mm
9.50
mm
12.70
mm
HFH-M8-25ZI-U M8 x 1.25 3.50
mm
12.50
mm
25.00
mm
1.78
mm
2.00
mm
8.00
mm
9.50
mm
12.70
mm
HFH-M8-30ZI-U M8 x 1.25 3.50
mm
12.50
mm
30.00
mm
1.78
mm
2.00
mm
8.00
mm
9.50
mm
12.70
mm
HFH-M8-35ZI-U M8 x 1.25 3.50
mm
12.50
mm
35.00
mm
1.78
mm
2.00
mm
8.00
mm
9.50
mm
12.70
mm
HFH-M8-40ZI-U M8 x 1.25 3.50
mm
12.50
mm
40.00
mm
1.78
mm
2.00
mm
8.00
mm
9.50
mm
12.70
mm
HFH-M8-50ZI-U M8 x 1.25 3.50
mm
12.50
mm
50.00
mm
1.78
mm
2.00
mm
8.00
mm
9.50
mm
12.70
mm
 
HFH-M10-15ZI-U M10 x 1.50 4.10
mm
15.70
mm
15.00
mm
2.29
mm
2.30
mm
10.00
mm
11.50
mm
13.70
mm
HFH-M10-20ZI-U M10 x 1.50 4.10
mm
15.70
mm
20.00
mm
2.29
mm
2.30
mm
10.00
mm
11.50
mm
13.70
mm
HFH-M10-25ZI-U M10 x 1.50 4.10
mm
15.70
mm
25.00
mm
2.29
mm
2.30
mm
10.00
mm
11.50
mm
13.70
mm
HFH-M10-30ZI-U M10 x 1.50 4.10
mm
15.70
mm
30.00
mm
2.29
mm
2.30
mm
10.00
mm
11.50
mm
13.70
mm
HFH-M10-35ZI-U M10 x 1.50 4.10
mm
15.70
mm
35.00
mm
2.29
mm
2.30
mm
10.00
mm
11.50
mm
13.70
mm
HFH-M10-40ZI-U M10 x 1.50 4.10
mm
15.70
mm
40.00
mm
2.29
mm
2.30
mm
10.00
mm
11.50
mm
13.70
mm
HFH-M10-50ZI-U M10 x 1.50 4.10
mm
15.70
mm
50.00
mm
2.29
mm
2.30
mm
10.00
mm
11.50
mm
13.70
mm
Series  HFH-U
Series  HFH-U  (Zinc Yellow)  /  American Standard Sizes
      • Head Shape-  Round
      • Thread Strength-  120 ksi
      • Sheet Hardness-  HRB 85 / HB 165 or Less
      • Material-  Heat-Treated Carbon Steel
      • Finish-  Zinc Yellow Plated per ASTM B633
      • Mil-Spec-  N/A
Series HFH-U
American Standard Sizes
(SAE)
Part
Number
Thread "S"
Max.
"H"
Head
Diameter
"L"
Overall
Length
"T"
Max.
Min.
Sheet
Thickness
Hole
Size in
Sheet
Max.
Hole in
Attached
Parts
Min.
Distance
to Edge
HFH-032-8ZC-U 10-32 0.105" 0.300" 0.500" 0.040" 0.050" 0.190" 0.250" 0.415"
HFH-032-12ZC-U 10-32 0.105" 0.300" 0.750" 0.040" 0.050" 0.190" 0.250" 0.415"
HFH-032-16ZC-U 10-32 0.105" 0.300" 1.000" 0.040" 0.050" 0.190" 0.250" 0.415"
HFH-032-20ZC-U 10-32 0.105" 0.300" 1.250" 0.040" 0.050" 0.190" 0.250" 0.415"
HFH-032-24ZC-U 10-32 0.105" 0.300" 1.500" 0.040" 0.050" 0.190" 0.250" 0.415"
HFH-032-28ZC-U 10-32 0.105" 0.300" 1.750" 0.040" 0.050" 0.190" 0.250" 0.415"
HFH-032-32ZC-U 10-32 0.105" 0.300" 2.000" 0.040" 0.050" 0.190" 0.250" 0.415"
 
HFH-0420-8ZC-U 1/4-20 0.125" 0.380" 0.500" 0.050" 0.060" 0.250" 0.312" 0.460"
HFH-0420-12ZC-U 1/4-20 0.125" 0.380" 0.750" 0.050" 0.060" 0.250" 0.312" 0.460"
HFH-0420-16ZC-U 1/4-20 0.125" 0.380" 1.000" 0.050" 0.060" 0.250" 0.312" 0.460"
HFH-0420-20ZC-U 1/4-20 0.125" 0.380" 1.250" 0.050" 0.060" 0.250" 0.312" 0.460"
HFH-0420-24ZC-U 1/4-20 0.125" 0.380" 1.500" 0.050" 0.060" 0.250" 0.312" 0.460"
HFH-0420-28ZC-U 1/4-20 0.125" 0.380" 1.750" 0.050" 0.060" 0.250" 0.312" 0.460"
HFH-0420-32ZC-U 1/4-20 0.125" 0.380" 2.000" 0.050" 0.060" 0.250" 0.312" 0.460"
 
HFH-0518-8ZC-U 5/16-18 0.140" 0.480" 0.500" 0.070" 0.075" 0.312" 0.375" 0.500"
HFH-0518-12ZC-U 5/16-18 0.140" 0.480" 0.750" 0.070" 0.075" 0.312" 0.375" 0.500"
HFH-0518-16ZC-U 5/16-18 0.140" 0.480" 1.000" 0.070" 0.075" 0.312" 0.375" 0.500"
HFH-0518-20ZC-U 5/16-18 0.140" 0.480" 1.250" 0.070" 0.075" 0.312" 0.375" 0.500"
HFH-0518-24ZC-U 5/16-18 0.140" 0.480" 1.500" 0.070" 0.075" 0.312" 0.375" 0.500"
HFH-0518-28ZC-U 5/16-18 0.140" 0.480" 1.750" 0.070" 0.075" 0.312" 0.375" 0.500"
HFH-0518-32ZC-U 5/16-18 0.140" 0.480" 2.000" 0.070" 0.075" 0.312" 0.375" 0.500"
 
HFH-0616-12ZC-U 3/8-16 0.155" 0.580" 0.750" 0.085" 0.090" 0.375" 0.437" 0.530"
HFH-0616-16ZC-U 3/8-16 0.155" 0.580" 1.000" 0.085" 0.090" 0.375" 0.437" 0.530"
HFH-0616-20ZC-U 3/8-16 0.155" 0.580" 1.250" 0.085" 0.090" 0.375" 0.437" 0.530"
HFH-0616-24ZC-U 3/8-16 0.155" 0.580" 1.500" 0.085" 0.090" 0.375" 0.437" 0.530"
HFH-0616-28ZC-U 3/8-16 0.155" 0.580" 1.750" 0.085" 0.090" 0.375" 0.437" 0.530"
HFH-0616-32ZC-U 3/8-16 0.155" 0.580" 2.000" 0.085" 0.090" 0.375" 0.437" 0.530"
Series  HFH-U  (Zinc Yellow)  /  Metric Sizes
      • Head Shape-  Round
      • Thread Strength-  900 mPa
      • Sheet Hardness-  HRB 85 / HB 165 or Less
      • Material-  Heat-Treated Carbon Steel
      • Finish-  Zinc Yellow Plated per ASTM B633
      • Mil-Spec-  N/A
Series HFH-U
Metric Sizes
Part
Number
Thread "S"
Max.
"H"
Head
Diameter
"L"
Overall
Length
"T"
Max.
Min.
Sheet
Thickness
Hole
Size in
Sheet
Max.
Hole in
Attached
Parts
Min.
Distance
to Edge
HFH-M5-15ZC-U M5 x 0.8 2.70
mm
7.80
mm
15.00
mm
1.14
mm
1.30
mm
5.00
mm
6.50
mm
10.70
mm
HFH-M5-20ZC-U M5 x 0.8 2.70
mm
7.80
mm
20.00
mm
1.14
mm
1.30
mm
5.00
mm
6.50
mm
10.70
mm
HFH-M5-25ZC-U M5 x 0.8 2.70
mm
7.80
mm
25.00
mm
1.14
mm
1.30
mm
5.00
mm
6.50
mm
10.70
mm
HFH-M5-30ZC-U M5 x 0.8 2.70
mm
7.80
mm
30.00
mm
1.14
mm
1.30
mm
5.00
mm
6.50
mm
10.70
mm
HFH-M5-35ZC-U M5 x 0.8 2.70
mm
7.80
mm
35.00
mm
1.14
mm
1.30
mm
5.00
mm
6.50
mm
10.70
mm
HFH-M5-40ZC-U M5 x 0.8 2.70
mm
7.80
mm
40.00
mm
1.14
mm
1.30
mm
5.00
mm
6.50
mm
10.70
mm
HFH-M5-50ZC-U M5 x 0.8 2.70
mm
7.80
mm
50.00
mm
1.14
mm
1.30
mm
5.00
mm
6.50
mm
10.70
mm
 
HFH-M6-15ZC-U M6 x 1.0 2.80
mm
9.40
mm
15.00
mm
1.27
mm
1.50
mm
6.00
mm
7.50
mm
11.50
mm
HFH-M6-20ZC-U M6 x 1.0 2.80
mm
9.40
mm
20.00
mm
1.27
mm
1.50
mm
6.00
mm
7.50
mm
11.50
mm
HFH-M6-25ZC-U M6 x 1.0 2.80
mm
9.40
mm
25.00
mm
1.27
mm
1.50
mm
6.00
mm
7.50
mm
11.50
mm
HFH-M6-30ZC-U M6 x 1.0 2.80
mm
9.40
mm
30.00
mm
1.27
mm
1.50
mm
6.00
mm
7.50
mm
11.50
mm
HFH-M6-35ZC-U M6 x 1.0 2.80
mm
9.40
mm
35.00
mm
1.27
mm
1.50
mm
6.00
mm
7.50
mm
11.50
mm
HFH-M6-40ZC-U M6 x 1.0 2.80
mm
9.40
mm
40.00
mm
1.27
mm
1.50
mm
6.00
mm
7.50
mm
11.50
mm
HFH-M6-50ZC-U M6 x 1.0 2.80
mm
9.40
mm
50.00
mm
1.27
mm
1.50
mm
6.00
mm
7.50
mm
11.50
mm
 
HFH-M8-15ZC-U M8 x 1.25 3.50
mm
12.50
mm
15.00
mm
1.78
mm
2.00
mm
8.00
mm
9.50
mm
12.70
mm
HFH-M8-20ZC-U M8 x 1.25 3.50
mm
12.50
mm
20.00
mm
1.78
mm
2.00
mm
8.00
mm
9.50
mm
12.70
mm
HFH-M8-25ZC-U M8 x 1.25 3.50
mm
12.50
mm
25.00
mm
1.78
mm
2.00
mm
8.00
mm
9.50
mm
12.70
mm
HFH-M8-30ZC-U M8 x 1.25 3.50
mm
12.50
mm
30.00
mm
1.78
mm
2.00
mm
8.00
mm
9.50
mm
12.70
mm
HFH-M8-35ZC-U M8 x 1.25 3.50
mm
12.50
mm
35.00
mm
1.78
mm
2.00
mm
8.00
mm
9.50
mm
12.70
mm
HFH-M8-40ZC-U M8 x 1.25 3.50
mm
12.50
mm
40.00
mm
1.78
mm
2.00
mm
8.00
mm
9.50
mm
12.70
mm
HFH-M8-50ZC-U M8 x 1.25 3.50
mm
12.50
mm
50.00
mm
1.78
mm
2.00
mm
8.00
mm
9.50
mm
12.70
mm
 
HFH-M10-15ZC-U M10 x 1.50 4.10
mm
15.70
mm
15.00
mm
2.29
mm
2.30
mm
10.00
mm
11.50
mm
13.70
mm
HFH-M10-20ZC-U M10 x 1.50 4.10
mm
15.70
mm
20.00
mm
2.29
mm
2.30
mm
10.00
mm
11.50
mm
13.70
mm
HFH-M10-25ZC-U M10 x 1.50 4.10
mm
15.70
mm
25.00
mm
2.29
mm
2.30
mm
10.00
mm
11.50
mm
13.70
mm
HFH-M10-30ZC-U M10 x 1.50 4.10
mm
15.70
mm
30.00
mm
2.29
mm
2.30
mm
10.00
mm
11.50
mm
13.70
mm
HFH-M10-35ZC-U M10 x 1.50 4.10
mm
15.70
mm
35.00
mm
2.29
mm
2.30
mm
10.00
mm
11.50
mm
13.70
mm
HFH-M10-40ZC-U M10 x 1.50 4.10
mm
15.70
mm
40.00
mm
2.29
mm
2.30
mm
10.00
mm
11.50
mm
13.70
mm
HFH-M10-50ZC-U M10 x 1.50 4.10
mm
15.70
mm
50.00
mm
2.29
mm
2.30
mm
10.00
mm
11.50
mm
13.70
mm

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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.


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