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Flush Nuts  F-U

Self Clinching Fasteners  •  Nuts For Sheet Metal
American Standard (Inches) & Metric Sizes

• Self-clinching    • Used as load-bearing threads in stainless steel panels as thin as 0.060"/ 1.53 mm
• Smooth on both surfaces    • Hex head provides strength
• Installed quickly and easily by squeezing into hole
American Standard Sizes:   • Series F-U
Metric Sizes:   • Series F-U
Series  F-U
Series  F-U  /  American Standard Sizes
      • Head Shape-  Hex
      • Sheet Hardness-  HRB 70 / HB 125 or Less
      • Material-  300 Series Stainless Steel
      • Finish-  Passivated per ASTM A380
Series F-U
American Standard Sizes
(SAE)
Part
Number
Thread "A"
Shank
Max.
"H"
Head
Diameter
"C"
Body
Diameter
Min.
Sheet
Thickness
Hole Size
in Sheet
Min.
Distance
to Edge
Mil-Spec
F-256-1-U 2-56 0.060" 0.188" 0.171" 0.060" - 0.090" 0.172" 0.230" M45938/4-1
F-256-2-U 2-56 0.090" 0.188" 0.171" 0.091" 0.172" 0.230" M45938/4-2
F-440-1-U 4-40 0.060" 0.188" 0.171" 0.060" - 0.090" 0.172" 0.230" M45938/4-3
F-440-2-U 4-40 0.090" 0.188" 0.171" 0.091" 0.172" 0.230" M45938/4-4
F-632-1-U 6-32 0.060" 0.250" 0.212" 0.060" - 0.090" 0.213" 0.270" M45938/4-5
F-632-2-U 6-32 0.090" 0.250" 0.212" 0.091" 0.213" 0.270" M45938/4-6
F-832-1-U 8-32 0.060" 0.312" 0.289" 0.060" - 0.090" 0.290" 0.280" M45938/4-7
F-832-2-U 8-32 0.090" 0.312" 0.289" 0.091" 0.290" 0.280" M45938/4-8
F-032-1-U 10-32 0.060" 0.343" 0.311" 0.060" - 0.090" 0.312" 0.310" M45938/4-9
F-032-2-U 10-32 0.090" 0.343" 0.311" 0.091" 0.312" 0.310" M45938/4-10
F-0420-3-U 1/4-20 0.120" 0.375" 0.343" 0.125" - 0.155" 0.344" 0.340" N/A
F-0420-4-U 1/4-20 0.151" 0.375" 0.343" 0.156" - 0.186" 0.344" 0.340" N/A
F-0420-5-U 1/4-20 0.182" 0.375" 0.343" 0.187" 0.344" 0.340" N/A
Series  F-U  /  Metric Sizes
      • Head Shape-  Hex
      • Sheet Hardness-  HRB 70 / HB 125 or Less
      • Material-  300 Series Stainless Steel
      • Finish-  Passivated per ASTM A380
Series F-U
Metric Sizes
Part
Number
Thread "A"
Shank
Max.
"H"
Head
Diameter
"C"
Body
Diameter
Min.
Sheet
Thickness
Hole Size
in Sheet
Min.
Distance
to Edge
Mil-Spec
F-M2-1-U M2 x 0.4 1.53
mm
4.80
mm
4.35
mm
1.53 - 2.30
mm
4.37
mm
6.00
mm
N/A
F-M2-2-U M2 x 0.4 2.30
mm
4.80
mm
4.35
mm
2.32
mm
4.37
mm
6.00
mm
N/A
F-M2.5-1-U M2.5 x 0.45 1.53
mm
4.80
mm
4.35
mm
1.53 - 2.30
mm
4.37
mm
6.00
mm
N/A
F-M2.5-2-U M2.5 x 0.45 2.30
mm
4.80
mm
4.35
mm
2.32
mm
4.37
mm
6.00
mm
N/A
F-M3-1-U M3 x 0.5 1.53
mm
4.80
mm
4.35
mm
1.53 - 2.30
mm
4.37
mm
6.00
mm
N/A
F-M3-2-U M3 x 0.5 2.30
mm
4.80
mm
4.35
mm
2.32
mm
4.37
mm
6.00
mm
N/A
F-M4-1-U M4 x 0.7 1.53
mm
7.90
mm
7.35
mm
1.53 - 2.30
mm
7.37
mm
7.20
mm
N/A
F-M4-2-U M4 x 0.7 2.30
mm
7.90
mm
7.35
mm
2.32
mm
7.37
mm
7.20
mm
N/A
F-M5-1-U M5 x 0.8 1.53
mm
8.70
mm
7.90
mm
1.53 - 2.30
mm
7.92
mm
8.00
mm
N/A
F-M5-2-U M5 x 0.8 2.30
mm
8.70
mm
7.90
mm
2.32
mm
7.92
mm
8.00
mm
N/A
F-M6-3-U M6 x 1.0 3.05
mm
9.50
mm
8.72
mm
3.18 - 3.94
mm
8.74
mm
8.80
mm
N/A
F-M6-4-U M6 x 1.0 3.84
mm
9.50
mm
8.72
mm
3.96 - 4.72
mm
8.74
mm
8.80
mm
N/A
F-M6-5-U M6 x 1.0 4.63
mm
9.50
mm
8.72
mm
4.75
mm
8.74
mm
8.80
mm
N/A

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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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