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Low Displacement Head Studs  FHL-U

Self Clinching Fasteners  •  Studs for Sheet Metal
American Standard (Inches) & Metric Sizes
• Self-clinching    • Installed quickly and easily by squeezing into place    • Creates flush-head assembly
• Stud locked into place    • Allows for installation closer to edge of sheet without causing distortion
• Minimum sheet thickness of 0.040" /1.00 mm
American Standard Sizes:   • Series FHL-U
Metric Sizes:   • Series FHL-U
Series  FHL-U
Series  FHL-U  /  American Standard Sizes
      • Head Shape-  Round
      • Sheet Hardness-  HRB 80 / HB 150 or Less
      • Material-  Heat-Treated Carbon Steel
      • Finish-  Zinc Clear Plated per ASTM B633
Series FHL-U
American Standard Sizes
(SAE)
Part
Number
Thread "S"
Max.
"H"
Head
Diameter
"L"
Overall
Length
Min.
Sheet
Thickness
Hole
Size in
Sheet
Max.
Hole in
Attached
Parts
Min.
Distance
to Edge
Mil-Spec
FHL-256-4ZI-U 2-56 0.080" 0.112" 0.250" 0.040" 0.085" 0.100" 0.098" N/A
FHL-256-5ZI-U 2-56 0.080" 0.112" 0.312" 0.040" 0.085" 0.100" 0.098" N/A
FHL-256-6ZI-U 2-56 0.080" 0.112" 0.375" 0.040" 0.085" 0.100" 0.098" N/A
FHL-256-8ZI-U 2-56 0.080" 0.112" 0.500" 0.040" 0.085" 0.100" 0.098" N/A
FHL-256-10ZI-U 2-56 0.080" 0.112" 0.625" 0.040" 0.085" 0.100" 0.098" N/A
FHL-256-12ZI-U 2-56 0.080" 0.112" 0.750" 0.040" 0.085" 0.100" 0.098" N/A
 
FHL-440-4ZI-U 4-40 0.085" 0.138" 0.250" 0.040" 0.111" 0.125" 0.124" N/A
FHL-440-5ZI-U 4-40 0.085" 0.138" 0.312" 0.040" 0.111" 0.125" 0.124" N/A
FHL-440-6ZI-U 4-40 0.085" 0.138" 0.375" 0.040" 0.111" 0.125" 0.124" N/A
FHL-440-8ZI-U 4-40 0.085" 0.138" 0.500" 0.040" 0.111" 0.125" 0.124" N/A
FHL-440-10ZI-U 4-40 0.085" 0.138" 0.625" 0.040" 0.111" 0.125" 0.124" N/A
FHL-440-12ZI-U 4-40 0.085" 0.138" 0.750" 0.040" 0.111" 0.125" 0.124" N/A
FHL-440-14ZI-U 4-40 0.085" 0.138" 0.875" 0.040" 0.111" 0.125" 0.124" N/A
FHL-440-16ZI-U 4-40 0.085" 0.138" 1.000" 0.040" 0.111" 0.125" 0.124" N/A
 
FHL-632-4ZI-U 6-32 0.090" 0.164" 0.250" 0.040" 0.137" 0.150" 0.150" N/A
FHL-632-5ZI-U 6-32 0.090" 0.164" 0.312" 0.040" 0.137" 0.150" 0.150" N/A
FHL-632-6ZI-U 6-32 0.090" 0.164" 0.375" 0.040" 0.137" 0.150" 0.150" N/A
FHL-632-8ZI-U 6-32 0.090" 0.164" 0.500" 0.040" 0.137" 0.150" 0.150" N/A
FHL-632-10ZI-U 6-32 0.090" 0.164" 0.625" 0.040" 0.137" 0.150" 0.150" N/A
FHL-632-12ZI-U 6-32 0.090" 0.164" 0.750" 0.040" 0.137" 0.150" 0.150" N/A
FHL-632-14ZI-U 6-32 0.090" 0.164" 0.875" 0.040" 0.137" 0.150" 0.150" N/A
FHL-632-16ZI-U 6-32 0.090" 0.164" 1.000" 0.040" 0.137" 0.150" 0.150" N/A
FHL-632-20ZI-U 6-32 0.090" 0.164" 1.250" 0.040" 0.137" 0.150" 0.150" N/A
FHL-632-24ZI-U 6-32 0.090" 0.164" 1.500" 0.040" 0.137" 0.150" 0.150" N/A
 
FHL-832-4ZI-U 8-32 0.090" 0.190" 0.250" 0.040" 0.163" 0.180" 0.176" N/A
FHL-832-5ZI-U 8-32 0.090" 0.190" 0.312" 0.040" 0.163" 0.180" 0.176" N/A
FHL-832-6ZI-U 8-32 0.090" 0.190" 0.375" 0.040" 0.163" 0.180" 0.176" N/A
FHL-832-8ZI-U 8-32 0.090" 0.190" 0.500" 0.040" 0.163" 0.180" 0.176" N/A
FHL-832-10ZI-U 8-32 0.090" 0.190" 0.625" 0.040" 0.163" 0.180" 0.176" N/A
FHL-832-12ZI-U 8-32 0.090" 0.190" 0.750" 0.040" 0.163" 0.180" 0.176" N/A
FHL-832-14ZI-U 8-32 0.090" 0.190" 0.875" 0.040" 0.163" 0.180" 0.176" N/A
FHL-832-16ZI-U 8-32 0.090" 0.190" 1.000" 0.040" 0.163" 0.180" 0.176" N/A
FHL-832-20ZI-U 8-32 0.090" 0.190" 1.250" 0.040" 0.163" 0.180" 0.176" N/A
FHL-832-24ZI-U 8-32 0.090" 0.190" 1.500" 0.040" 0.163" 0.180" 0.176" N/A
 
FHL-032-5ZI-U 10-32 0.100" 0.225" 0.312" 0.040" 0.189" 0.205" 0.210" N/A
FHL-032-6ZI-U 10-32 0.100" 0.225" 0.375" 0.040" 0.189" 0.205" 0.210" N/A
FHL-032-8ZI-U 10-32 0.100" 0.225" 0.500" 0.040" 0.189" 0.205" 0.210" N/A
FHL-032-10ZI-U 10-32 0.100" 0.225" 0.625" 0.040" 0.189" 0.205" 0.210" N/A
FHL-032-12ZI-U 10-32 0.100" 0.225" 0.750" 0.040" 0.189" 0.205" 0.210" N/A
FHL-032-14ZI-U 10-32 0.100" 0.225" 0.875" 0.040" 0.189" 0.205" 0.210" N/A
FHL-032-16ZI-U 10-32 0.100" 0.225" 1.000" 0.040" 0.189" 0.205" 0.210" N/A
FHL-032-20ZI-U 10-32 0.100" 0.225" 1.250" 0.040" 0.189" 0.205" 0.210" N/A
FHL-032-24ZI-U 10-32 0.100" 0.225" 1.500" 0.040" 0.189" 0.205" 0.210" N/A
Series  FHL-U  /  Metric Sizes
      • Head Shape-  Round
      • Sheet Hardness-  HRB 80 / HB 150 or Less
      • Material-  Heat-Treated Carbon Steel
      • Finish-  Zinc Clear Plated per ASTM B633
Series FHL-U
Metric Sizes
Part
Number
Thread "S"
Max.
"H"
Head
Diameter
"L"
Overall
Length
Min.
Sheet
Thickness
Hole
Size in
Sheet
Max.
Hole in
Attached
Parts
Min.
Distance
to Edge
Mil-Spec
FHL-M2.5-6-ZI-U M2.5 x 0.45 2.10
mm
3.15
mm
6.00
mm
1.00
mm
2.50
mm
2.90
mm
2.80
mm
N/A
FHL-M2.5-8-ZI-U M2.5 x 0.45 2.10
mm
3.15
mm
8.00
mm
1.00
mm
2.50
mm
2.90
mm
2.80
mm
N/A
FHL-M2.5-10-ZI-U M2.5 x 0.45 2.10
mm
3.15
mm
10.00
mm
1.00
mm
2.50
mm
2.90
mm
2.80
mm
N/A
FHL-M2.5-12-ZI-U M2.5 x 0.45 2.10
mm
3.15
mm
12.00
mm
1.00
mm
2.50
mm
2.90
mm
2.80
mm
N/A
FHL-M2.5-15-ZI-U M2.5 x 0.45 2.10
mm
3.15
mm
15.00
mm
1.00
mm
2.50
mm
2.90
mm
2.80
mm
N/A
FHL-M2.5-18-ZI-U M2.5 x 0.45 2.10
mm
3.15
mm
18.00
mm
1.00
mm
2.50
mm
2.90
mm
2.80
mm
N/A
 
FHL-M3-6-ZI-U M3 x 0.5 2.10
mm
3.65
mm
6.00
mm
1.00
mm
3.00
mm
3.40
mm
3.30
mm
N/A
FHL-M3-8-ZI-U M3 x 0.5 2.10
mm
3.65
mm
8.00
mm
1.00
mm
3.00
mm
3.40
mm
3.30
mm
N/A
FHL-M3-10-ZI-U M3 x 0.5 2.10
mm
3.65
mm
10.00
mm
1.00
mm
3.00
mm
3.40
mm
3.30
mm
N/A
FHL-M3-12-ZI-U M3 x 0.5 2.10
mm
3.65
mm
12.00
mm
1.00
mm
3.00
mm
3.40
mm
3.30
mm
N/A
FHL-M3-15-ZI-U M3 x 0.5 2.10
mm
3.65
mm
15.00
mm
1.00
mm
3.00
mm
3.40
mm
3.30
mm
N/A
FHL-M3-18-ZI-U M3 x 0.5 2.10
mm
3.65
mm
18.00
mm
1.00
mm
3.00
mm
3.40
mm
3.30
mm
N/A
FHL-M3-20-ZI-U M3 x 0.5 2.10
mm
3.65
mm
20.00
mm
1.00
mm
3.00
mm
3.40
mm
3.30
mm
N/A
FHL-M3-25-ZI-U M3 x 0.5 2.10
mm
3.65
mm
25.00
mm
1.00
mm
3.00
mm
3.40
mm
3.30
mm
N/A
 
FHL-M3.5-6-ZI-U M3.5 x 0.6 2.30
mm
4.15
mm
6.00
mm
1.00
mm
3.50
mm
3.90
mm
3.80
mm
N/A
FHL-M3.5-8-ZI-U M3.5 x 0.6 2.30
mm
4.15
mm
8.00
mm
1.00
mm
3.50
mm
3.90
mm
3.80
mm
N/A
FHL-M3.5-10-ZI-U M3.5 x 0.6 2.30
mm
4.15
mm
10.00
mm
1.00
mm
3.50
mm
3.90
mm
3.80
mm
N/A
FHL-M3.5-12-ZI-U M3.5 x 0.6 2.30
mm
4.15
mm
12.00
mm
1.00
mm
3.50
mm
3.90
mm
3.80
mm
N/A
FHL-M3.5-15-ZI-U M3.5 x 0.6 2.30
mm
4.15
mm
15.00
mm
1.00
mm
3.50
mm
3.90
mm
3.80
mm
N/A
FHL-M3.5-18-ZI-U M3.5 x 0.6 2.30
mm
4.15
mm
18.00
mm
1.00
mm
3.50
mm
3.90
mm
3.80
mm
N/A
FHL-M3.5-20-ZI-U M3.5 x 0.6 2.30
mm
4.15
mm
20.00
mm
1.00
mm
3.50
mm
3.90
mm
3.80
mm
N/A
FHL-M3.5-25-ZI-U M3.5 x 0.6 2.30
mm
4.15
mm
25.00
mm
1.00
mm
3.50
mm
3.90
mm
3.80
mm
N/A
FHL-M3.5-30-ZI-U M3.5 x 0.6 2.30
mm
4.15
mm
30.00
mm
1.00
mm
3.50
mm
3.90
mm
3.80
mm
N/A
 
FHL-M4-6-ZI-U M4 x 0.7 2.40
mm
4.65
mm
6.00
mm
1.00
mm
4.00
mm
4.40
mm
4.30
mm
N/A
FHL-M4-8-ZI-U M4 x 0.7 2.40
mm
4.65
mm
8.00
mm
1.00
mm
4.00
mm
4.40
mm
4.30
mm
N/A
FHL-M4-10-ZI-U M4 x 0.7 2.40
mm
4.65
mm
10.00
mm
1.00
mm
4.00
mm
4.40
mm
4.30
mm
N/A
FHL-M4-12-ZI-U M4 x 0.7 2.40
mm
4.65
mm
12.00
mm
1.00
mm
4.00
mm
4.40
mm
4.30
mm
N/A
FHL-M4-15-ZI-U M4 x 0.7 2.40
mm
4.65
mm
15.00
mm
1.00
mm
4.00
mm
4.40
mm
4.30
mm
N/A
FHL-M4-18-ZI-U M4 x 0.7 2.40
mm
4.65
mm
18.00
mm
1.00
mm
4.00
mm
4.40
mm
4.30
mm
N/A
FHL-M4-20-ZI-U M4 x 0.7 2.40
mm
4.65
mm
20.00
mm
1.00
mm
4.00
mm
4.40
mm
4.30
mm
N/A
FHL-M4-25-ZI-U M4 x 0.7 2.40
mm
4.65
mm
25.00
mm
1.00
mm
4.00
mm
4.40
mm
4.30
mm
N/A
FHL-M4-30-ZI-U M4 x 0.7 2.40
mm
4.65
mm
30.00
mm
1.00
mm
4.00
mm
4.40
mm
4.30
mm
N/A
FHL-M4-35-ZI-U M4 x 0.7 2.40
mm
4.65
mm
35.00
mm
1.00
mm
4.00
mm
4.40
mm
4.30
mm
N/A
 
FHL-M5-8-ZI-U M5 x 0.8 2.70
mm
5.90
mm
8.00
mm
1.00
mm
5.00
mm
5.40
mm
5.60
mm
N/A
FHL-M5-10-ZI-U M5 x 0.8 2.70
mm
5.90
mm
10.00
mm
1.00
mm
5.00
mm
5.40
mm
5.60
mm
N/A
FHL-M5-12-ZI-U M5 x 0.8 2.70
mm
5.90
mm
12.00
mm
1.00
mm
5.00
mm
5.40
mm
5.60
mm
N/A
FHL-M5-15-ZI-U M5 x 0.8 2.70
mm
5.90
mm
15.00
mm
1.00
mm
5.00
mm
5.40
mm
5.60
mm
N/A
FHL-M5-18-ZI-U M5 x 0.8 2.70
mm
5.90
mm
18.00
mm
1.00
mm
5.00
mm
5.40
mm
5.60
mm
N/A
FHL-M5-20-ZI-U M5 x 0.8 2.70
mm
5.90
mm
20.00
mm
1.00
mm
5.00
mm
5.40
mm
5.60
mm
N/A
FHL-M5-25-ZI-U M5 x 0.8 2.70
mm
5.90
mm
25.00
mm
1.00
mm
5.00
mm
5.40
mm
5.60
mm
N/A
FHL-M5-30-ZI-U M5 x 0.8 2.70
mm
5.90
mm
30.00
mm
1.00
mm
5.00
mm
5.40
mm
5.60
mm
N/A
FHL-M5-35-ZI-U M5 x 0.8 2.70
mm
5.90
mm
35.00
mm
1.00
mm
5.00
mm
5.40
mm
5.60
mm
N/A

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