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High Strength Studs  HFHS-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 HFHS-U  
Metric Sizes:   • Series HFHS-U
Series  HFHS-U
Series  HFHS-U  /  American Standard Sizes
      • Head Shape-  Round
      • Thread Strength-  75 ksi
      • Sheet Hardness-  HRB 70 / HB 125 or Less
      • Material-  300 Series Stainless Steel
      • Finish-  Passivated per ASTM A380
      • Mil-Spec-  N/A
Series HFHS-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
HFHS-032-8-U 10-32 0.105" 0.300" 0.500" 0.040" 0.050" 0.190" 0.250" 0.415"
HFHS-032-12-U 10-32 0.105" 0.300" 0.750" 0.040" 0.050" 0.190" 0.250" 0.415"
HFHS-032-16-U 10-32 0.105" 0.300" 1.000" 0.040" 0.050" 0.190" 0.250" 0.415"
HFHS-032-20-U 10-32 0.105" 0.300" 1.250" 0.040" 0.050" 0.190" 0.250" 0.415"
HFHS-032-24-U 10-32 0.105" 0.300" 1.500" 0.040" 0.050" 0.190" 0.250" 0.415"
HFHS-032-28-U 10-32 0.105" 0.300" 1.750" 0.040" 0.050" 0.190" 0.250" 0.415"
HFHS-032-32-U 10-32 0.105" 0.300" 2.000" 0.040" 0.050" 0.190" 0.250" 0.415"
 
HFHS-0420-8-U 1/4-20 0.125" 0.380" 0.500" 0.050" 0.060" 0.250" 0.312" 0.460"
HFHS-0420-12-U 1/4-20 0.125" 0.380" 0.750" 0.050" 0.060" 0.250" 0.312" 0.460"
HFHS-0420-16-U 1/4-20 0.125" 0.380" 1.000" 0.050" 0.060" 0.250" 0.312" 0.460"
HFHS-0420-20-U 1/4-20 0.125" 0.380" 1.250" 0.050" 0.060" 0.250" 0.312" 0.460"
HFHS-0420-24-U 1/4-20 0.125" 0.380" 1.500" 0.050" 0.060" 0.250" 0.312" 0.460"
HFHS-0420-28-U 1/4-20 0.125" 0.380" 1.750" 0.050" 0.060" 0.250" 0.312" 0.460"
HFHS-0420-32-U 1/4-20 0.125" 0.380" 2.000" 0.050" 0.060" 0.250" 0.312" 0.460"
 
HFHS-0518-8-U 5/16-18 0.140" 0.480" 0.500" 0.070" 0.075" 0.312" 0.375" 0.500"
HFHS-0518-12-U 5/16-18 0.140" 0.480" 0.750" 0.070" 0.075" 0.312" 0.375" 0.500"
HFHS-0518-16-U 5/16-18 0.140" 0.480" 1.000" 0.070" 0.075" 0.312" 0.375" 0.500"
HFHS-0518-20-U 5/16-18 0.140" 0.480" 1.250" 0.070" 0.075" 0.312" 0.375" 0.500"
HFHS-0518-24-U 5/16-18 0.140" 0.480" 1.500" 0.070" 0.075" 0.312" 0.375" 0.500"
HFHS-0518-28-U 5/16-18 0.140" 0.480" 1.750" 0.070" 0.075" 0.312" 0.375" 0.500"
HFHS-0518-32-U 5/16-18 0.140" 0.480" 2.000" 0.070" 0.075" 0.312" 0.375" 0.500"
 
HFHS-0616-12-U 3/8-16 0.155" 0.580" 0.750" 0.085" 0.090" 0.375" 0.437" 0.530"
HFHS-0616-16-U 3/8-16 0.155" 0.580" 1.000" 0.085" 0.090" 0.375" 0.437" 0.530"
HFHS-0616-20-U 3/8-16 0.155" 0.580" 1.250" 0.085" 0.090" 0.375" 0.437" 0.530"
HFHS-0616-24-U 3/8-16 0.155" 0.580" 1.500" 0.085" 0.090" 0.375" 0.437" 0.530"
HFHS-0616-28-U 3/8-16 0.155" 0.580" 1.750" 0.085" 0.090" 0.375" 0.437" 0.530"
HFHS-0616-32-U 3/8-16 0.155" 0.580" 2.000" 0.085" 0.090" 0.375" 0.437" 0.530"
Series  HFHS-U  /  Metric Sizes
      • Head Shape-  Round
      • Thread Strength-  515 mPa
      • Sheet Hardness-  HRB 70 / HB 125 or Less
      • Material-  300 Series Stainless Steel
      • Finish-  Passivated per ASTM A380
      • Mil-Spec-  N/A
Series HFHS-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
HFHS-M5-15-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
HFHS-M5-20-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
HFHS-M5-25-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
HFHS-M5-30-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
HFHS-M5-35-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
HFHS-M5-40-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
HFHS-M5-50-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
 
HFHS-M6-15-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
HFHS-M6-20-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
HFHS-M6-25-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
HFHS-M6-30-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
HFHS-M6-35-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
HFHS-M6-40-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
HFHS-M6-50-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
 
HFHS-M8-15-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
HFHS-M8-20-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
HFHS-M8-25-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
HFHS-M8-30-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
HFHS-M8-35-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
HFHS-M8-40-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
HFHS-M8-50-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
 
HFHS-M10-15-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
HFHS-M10-20-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
HFHS-M10-25-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
HFHS-M10-30-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
HFHS-M10-35-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
HFHS-M10-40-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
HFHS-M10-50-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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