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Blind Press Nuts  B-U,  BS-U

Self Clinching Fasteners  •  Nuts For Sheet Metal
American Standard (Inches) & Metric Sizes
• Self-clinching     • Blind, sealed thread     • Provide seal against foreign objects
• Protects components from screw     • Used as extended thread lengths in sheet metal as thin as 0.040"/1.00 mm
• Installed quickly and easily with any press by squeezing
American Standard Sizes:   • Series B-U   • Series BS-U
Metric Sizes:   • Series B-U   • Series BS-U
Series  B-U
Series B-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
      • Mil-Spec-  N/A
Series B-U
American Standard Sizes
(SAE)
Part
Number
Thread "A"
(Shank)
Max.
Min.
Sheet
Thickness
Hole
Size in
Sheet
"B"
Max.
"C"
Max.
"E" "F"
Min.
"L"
Max.
"T" Min.
Distance
to Edge
B-440-1ZI-U 4-40 0.038" 0.040" 0.166" 0.150" 0.165" 0.250" 0.210" 0.335" 0.380" 0.190"
B-632-1ZI-U 6-32 0.038" 0.040" 0.188" 0.169" 0.187" 0.280" 0.230" 0.335" 0.380" 0.220"
B-832-1ZI-U 8-32 0.038" 0.040" 0.213" 0.204" 0.212" 0.310" 0.280" 0.385" 0.440" 0.270"
B-032-1ZI-U 10-32 0.038" 0.040" 0.250" 0.235" 0.249" 0.340" 0.280" 0.385" 0.440" 0.280"
B-0420-1ZI-U 1/4-20 0.038" 0.056" 0.344" 0.305" 0.343" 0.430" 0.310" 0.500" 0.560" 0.340"
 
B-440-2ZI-U 4-40 0.054" 0.056" 0.166" 0.150" 0.165" 0.250" 0.210" 0.335" 0.380" 0.190"
B-632-2ZI-U 6-32 0.054" 0.056" 0.188" 0.169" 0.187" 0.280" 0.230" 0.335" 0.380" 0.220"
B-832-2ZI-U 8-32 0.054" 0.056" 0.213" 0.204" 0.212" 0.310" 0.280" 0.385" 0.440" 0.270"
B-032-2ZI-U 10-32 0.054" 0.056" 0.250" 0.235" 0.249" 0.340" 0.280" 0.385" 0.440" 0.280"
B-0420-2ZI-U 1/4-20 0.087" 0.090" 0.344" 0.305" 0.343" 0.430" 0.310" 0.500" 0.560" 0.340"
Series B-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
      • Mil-Spec-  N/A
Series B-U
Metric Sizes
Part
Number
Thread "A"
(Shank)
Max.
Min.
Sheet
Thickness
Hole
Size in
Sheet
"B"
Max.
"C"
Max.
"E" "F"
Min.
"L"
Max.
"T" Min.
Distance
to Edge
B-M3-1ZI-U M3 x 0.5 0.97
mm
1.00
mm
4.22
mm
3.84
mm
4.20
mm
6.35
mm
5.30
mm
8.50
mm
9.60
mm
4.80
mm
B-M4-1ZI-U M4 x 0.7 0.97
mm
1.00
mm
5.41
mm
5.20
mm
5.38
mm
7.95
mm
7.10
mm
9.80
mm
11.20
mm
6.90
mm
B-M5-1ZI-U M5 x 0.8 0.97
mm
1.00
mm
6.35
mm
6.02
mm
6.33
mm
8.75
mm
7.10
mm
9.80
mm
11.20
mm
7.10
mm
B-M6-1ZI-U M6 x 1.0 1.38
mm
1.40
mm
8.75
mm
7.80
mm
8.73
mm
11.10
mm
7.80
mm
12.70
mm
14.30
mm
8.60
mm
 
B-M3-2ZI-U M3 x 0.5 1.38
mm
1.40
mm
4.22
mm
3.84
mm
4.20
mm
6.35
mm
5.30
mm
8.50
mm
9.60
mm
4.80
mm
B-M4-2ZI-U M4 x 0.7 1.38
mm
1.40
mm
5.41
mm
5.20
mm
5.38
mm
7.95
mm
7.10
mm
9.80
mm
11.20
mm
6.90
mm
B-M5-2ZI-U M5 x 0.8 1.38
mm
1.40
mm
6.35
mm
6.02
mm
6.33
mm
8.75
mm
7.10
mm
9.80
mm
11.20
mm
7.10
mm
B-M6-2ZI-U M6 x 1.0 2.21
mm
2.29
mm
8.75
mm
7.80
mm
8.73
mm
11.10
mm
7.80
mm
12.70
mm
14.30
mm
8.60
mm
Series  BS-U
Series  BS-U  /  American Standard Sizes
      • Head Shape-  Round
      • Sheet Hardness-  HRB 70 / HB 125 or Less
      • Material-  300 Series Stainless Steel
      • Finish-  Passivated per ASTM A380
      • Mil-Spec-  N/A
Series BS-U
American Standard Sizes
(SAE)
Part
Number
Thread "A"
(Shank)
Max.
Min.
Sheet
Thickness
Hole
Size in
Sheet
"B"
Max.
"C"
Max.
"E" "F"
Min.
"L"
Max.
"T" Min.
Distance
to Edge
BS-440-1-U 4-40 0.038" 0.040" 0.166" 0.150" 0.165" 0.250" 0.210" 0.335" 0.380" 0.190"
BS-632-1-U 6-32 0.038" 0.040" 0.188" 0.169" 0.187" 0.280" 0.230" 0.335" 0.380" 0.220"
BS-832-1-U 8-32 0.038" 0.040" 0.213" 0.204" 0.212" 0.310" 0.280" 0.385" 0.440" 0.270"
BS-032-1-U 10-32 0.038" 0.040" 0.250" 0.235" 0.249" 0.340" 0.280" 0.385" 0.440" 0.280"
BS-0420-1-U 1/4-20 0.054" 0.056" 0.344" 0.305" 0.343" 0.430" 0.310" 0.500" 0.560" 0.340"
 
BS-440-2-U 4-40 0.054" 0.056" 0.166" 0.150" 0.165" 0.250" 0.210" 0.335" 0.380" 0.190"
BS-632-2-U 6-32 0.054" 0.056" 0.188" 0.169" 0.187" 0.280" 0.230" 0.335" 0.380" 0.220"
BS-832-2-U 8-32 0.054" 0.056" 0.213" 0.204" 0.212" 0.310" 0.280" 0.385" 0.440" 0.270"
BS-032-2-U 10-32 0.054" 0.056" 0.250" 0.235" 0.249" 0.340" 0.280" 0.385" 0.440" 0.280"
BS-0420-2-U 1/4-20 0.087" 0.090" 0.344" 0.305" 0.343" 0.430" 0.310" 0.500" 0.560" 0.340"
Series BS-U  /  Metric Sizes
      • Head Shape-  Round
      • Sheet Hardness-  HRB 70 / HB 125 or Less
      • Material-  300 Series Stainless Steel
      • Finish-  Passivated per ASTM A380
      • Mil-Spec-  N/A
Series BS-U
Metric Sizes
Part
Number
Thread "A"
(Shank)
Max.
Min.
Sheet
Thickness
Hole
Size in
Sheet
"B"
Max.
"C"
Max.
"E" "F"
Min.
"L"
Max.
"T" Min.
Distance
to Edge
B-M3-1-U M3 x 0.5 0.97
mm
1.00
mm
4.22
mm
3.84
mm
4.20
mm
6.35
mm
5.30
mm
8.50
mm
9.60
mm
4.80
mm
B-M4-1-U M4 x 0.7 0.97
mm
1.00
mm
5.41
mm
5.20
mm
5.38
mm
7.95
mm
7.10
mm
9.80
mm
11.20
mm
6.90
mm
B-M5-1-U M5 x 0.8 0.97
mm
1.00
mm
6.35
mm
6.02
mm
6.33
mm
8.75
mm
7.10
mm
9.80
mm
11.20
mm
7.10
mm
B-M6-1-U M6 x 1.0 1.38
mm
1.40
mm
8.75
mm
7.80
mm
8.73
mm
11.10
mm
7.80
mm
12.70
mm
14.30
mm
8.60
mm
 
B-M3-2-U M3 x 0.5 1.38
mm
1.40
mm
4.22
mm
3.84
mm
4.20
mm
6.35
mm
5.30
mm
8.50
mm
9.60
mm
4.80
mm
B-M4-2-U M4 x 0.7 1.38
mm
1.40
mm
5.41
mm
5.20
mm
5.38
mm
7.95
mm
7.10
mm
9.80
mm
11.20
mm
6.90
mm
B-M5-2-U M5 x 0.8 1.38
mm
1.40
mm
6.35
mm
6.02
mm
6.33
mm
8.75
mm
7.10
mm
9.80
mm
11.20
mm
7.10
mm
B-M6-2-U M6 x 1.0 2.21
mm
2.29
mm
8.75
mm
7.80
mm
8.73
mm
11.10
mm
7.80
mm
12.70
mm
14.30
mm
8.60
mm

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