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Blind Threaded Standoffs  BSO4-U

Self Clinching Fasteners  •  Standoffs For Sheet Metal
American Standard (Inches) & Metric Sizes
• Self-clinching    • Installed quickly and easily in metal panels that are 0.040" /1.00 mm thick
• Installed using pneumatic, hydraulic, or mechanical press    • No secondary operation needed prior to installation
• With blind standoff, outer sheet surface is both flushed and closed
American Standard Sizes:   • Series BSO4-U
Metric Sizes:   • Series BSO4-U
Series  BSO4-U
Series  BSO4-U  /  American Standard Sizes
      • Head Shape-  Hex
      • Sheet Hardness-  HRB 88 / HB 176 or Less
      • Material-  400 Series Stainless Steel
      • Finish-  Passivated per ASTM A380
Series BSO4-U
American Standard Sizes
(SAE)
Part
Number
Thread "H"
Nom.
"L"
Body
Length
"F"
Full Thread
Min. Depth
Min.
Sheet
Thickness
Hole
Size in
Sheet
"C"
Barrel
O.D.
Min.
Distance
to Edge
Mil-Spec
BSO4-440-4-U 4-40 3/16" 0.125" 0.156" 0.040" 0.166" 0.165" 0.230" N/A
BSO4-440-6-U 4-40 3/16" 0.187" 0.156" 0.040" 0.166" 0.165" 0.230" N/A
BSO4-440-8-U 4-40 3/16" 0.250" 0.156" 0.040" 0.166" 0.165" 0.230" N/A
BSO4-440-10-U 4-40 3/16" 0.312" 0.156" 0.040" 0.166" 0.165" 0.230" N/A
BSO4-440-12-U 4-40 3/16" 0.375" 0.156" 0.040" 0.166" 0.165" 0.230" N/A
BSO4-440-14-U 4-40 3/16" 0.437" 0.187" 0.040" 0.166" 0.165" 0.230" N/A
BSO4-440-16-U 4-40 3/16" 0.500" 0.250" 0.040" 0.166" 0.165" 0.230" N/A
BSO4-440-18-U 4-40 3/16" 0.562" 0.250" 0.040" 0.166" 0.165" 0.230" N/A
BSO4-440-20-U 4-40 3/16" 0.625" 0.250" 0.040" 0.166" 0.165" 0.230" N/A
BSO4-440-22-U 4-40 3/16" 0.687" 0.375" 0.040" 0.166" 0.165" 0.230" N/A
BSO4-440-24-U 4-40 3/16" 0.750" 0.375" 0.040" 0.166" 0.165" 0.230" N/A
BSO4-440-26-U 4-40 3/16" 0.812" 0.375" 0.040" 0.166" 0.165" 0.230" N/A
BSO4-440-28-U 4-40 3/16" 0.875" 0.375" 0.040" 0.166" 0.165" 0.230" N/A
BSO4-440-30-U 4-40 3/16" 0.937" 0.375" 0.040" 0.166" 0.165" 0.230" N/A
BSO4-440-32-U 4-40 3/16" 1.000" 0.375" 0.040" 0.166" 0.165" 0.230" N/A
BSO4-440-34-U 4-40 3/16" 1.062" 0.375" 0.040" 0.166" 0.165" 0.230" N/A
 
BSO4-6440-4-U 4-40 1/4" 0.125" 0.156" 0.040" 0.213" 0.212" 0.270" N/A
BSO4-6440-6-U 4-40 1/4" 0.187" 0.156" 0.040" 0.213" 0.212" 0.270" N/A
BSO4-6440-8-U 4-40 1/4" 0.250" 0.156" 0.040" 0.213" 0.212" 0.270" N/A
BSO4-6440-10-U 4-40 1/4" 0.312" 0.156" 0.040" 0.213" 0.212" 0.270" N/A
BSO4-6440-12-U 4-40 1/4" 0.375" 0.156" 0.040" 0.213" 0.212" 0.270" N/A
BSO4-6440-14-U 4-40 1/4" 0.437" 0.187" 0.040" 0.213" 0.212" 0.270" N/A
BSO4-6440-16-U 4-40 1/4" 0.500" 0.250" 0.040" 0.213" 0.212" 0.270" N/A
BSO4-6440-18-U 4-40 1/4" 0.562" 0.250" 0.040" 0.213" 0.212" 0.270" N/A
BSO4-6440-20-U 4-40 1/4" 0.625" 0.250" 0.040" 0.213" 0.212" 0.270" N/A
BSO4-6440-22-U 4-40 1/4" 0.687" 0.375" 0.040" 0.213" 0.212" 0.270" N/A
BSO4-6440-24-U 4-40 1/4" 0.750" 0.375" 0.040" 0.213" 0.212" 0.270" N/A
BSO4-6440-26-U 4-40 1/4" 0.812" 0.375" 0.040" 0.213" 0.212" 0.270" N/A
BSO4-6440-28-U 4-40 1/4" 0.875" 0.375" 0.040" 0.213" 0.212" 0.270" N/A
BSO4-6440-30-U 4-40 1/4" 0.937" 0.375" 0.040" 0.213" 0.212" 0.270" N/A
BSO4-6440-32-U 4-40 1/4" 1.000" 0.375" 0.040" 0.213" 0.212" 0.270" N/A
BSO4-6440-34-U 4-40 1/4" 1.062" 0.375" 0.040" 0.213" 0.212" 0.270" N/A
 
BSO4-632-4-U 6-32 1/4" 0.125" 0.156" 0.040" 0.213" 0.212" 0.270" N/A
BSO4-632-6-U 6-32 1/4" 0.187" 0.156" 0.040" 0.213" 0.212" 0.270" N/A
BSO4-632-8-U 6-32 1/4" 0.250" 0.156" 0.040" 0.213" 0.212" 0.270" N/A
BSO4-632-10-U 6-32 1/4" 0.312" 0.156" 0.040" 0.213" 0.212" 0.270" N/A
BSO4-632-12-U 6-32 1/4" 0.375" 0.156" 0.040" 0.213" 0.212" 0.270" N/A
BSO4-632-14-U 6-32 1/4" 0.437" 0.187" 0.040" 0.213" 0.212" 0.270" N/A
BSO4-632-16-U 6-32 1/4" 0.500" 0.250" 0.040" 0.213" 0.212" 0.270" N/A
BSO4-632-18-U 6-32 1/4" 0.562" 0.250" 0.040" 0.213" 0.212" 0.270" N/A
BSO4-632-20-U 6-32 1/4" 0.625" 0.250" 0.040" 0.213" 0.212" 0.270" N/A
BSO4-632-22-U 6-32 1/4" 0.687" 0.375" 0.040" 0.213" 0.212" 0.270" N/A
BSO4-632-24-U 6-32 1/4" 0.750" 0.375" 0.040" 0.213" 0.212" 0.270" N/A
BSO4-632-26-U 6-32 1/4" 0.812" 0.375" 0.040" 0.213" 0.212" 0.270" N/A
BSO4-632-28-U 6-32 1/4" 0.875" 0.375" 0.040" 0.213" 0.212" 0.270" N/A
BSO4-632-30-U 6-32 1/4" 0.937" 0.375" 0.040" 0.213" 0.212" 0.270" N/A
BSO4-632-32-U 6-32 1/4" 1.000" 0.375" 0.040" 0.213" 0.212" 0.270" N/A
BSO4-632-34-U 6-32 1/4" 1.062" 0.375" 0.040" 0.213" 0.212" 0.270" N/A
 
BSO4-8632-4-U 6-32 5/16" 0.125" 0.156" 0.050" 0.281" 0.280" 0.310" N/A
BSO4-8632-6-U 6-32 5/16" 0.187" 0.156" 0.050" 0.281" 0.280" 0.310" N/A
BSO4-8632-8-U 6-32 5/16" 0.250" 0.156" 0.050" 0.281" 0.280" 0.310" N/A
BSO4-8632-10-U 6-32 5/16" 0.312" 0.156" 0.050" 0.281" 0.280" 0.310" N/A
BSO4-8632-12-U 6-32 5/16" 0.375" 0.156" 0.050" 0.281" 0.280" 0.310" N/A
BSO4-8632-14-U 6-32 5/16" 0.437" 0.187" 0.050" 0.281" 0.280" 0.310" N/A
BSO4-8632-16-U 6-32 5/16" 0.500" 0.250" 0.050" 0.281" 0.280" 0.310" N/A
BSO4-8632-18-U 6-32 5/16" 0.562" 0.250" 0.050" 0.281" 0.280" 0.310" N/A
BSO4-8632-20-U 6-32 5/16" 0.625" 0.250" 0.050" 0.281" 0.280" 0.310" N/A
BSO4-8632-22-U 6-32 5/16" 0.687" 0.375" 0.050" 0.281" 0.280" 0.310" N/A
BSO4-8632-24-U 6-32 5/16" 0.750" 0.375" 0.050" 0.281" 0.280" 0.310" N/A
BSO4-8632-26-U 6-32 5/16" 0.812" 0.375" 0.050" 0.281" 0.280" 0.310" N/A
BSO4-8632-28-U 6-32 5/16" 0.875" 0.375" 0.050" 0.281" 0.280" 0.310" N/A
BSO4-8632-30-U 6-32 5/16" 0.937" 0.375" 0.050" 0.281" 0.280" 0.310" N/A
BSO4-8632-32-U 6-32 5/16" 1.000" 0.375" 0.050" 0.281" 0.280" 0.310" N/A
BSO4-8632-34-U 6-32 5/16" 1.062" 0.375" 0.050" 0.281" 0.280" 0.310" N/A
 
BSO4-832-4-U 8-32 5/16" 0.125" 0.156" 0.050" 0.281" 0.280" 0.310" N/A
BSO4-832-6-U 8-32 5/16" 0.187" 0.156" 0.050" 0.281" 0.280" 0.310" N/A
BSO4-832-8-U 8-32 5/16" 0.250" 0.156" 0.050" 0.281" 0.280" 0.310" N/A
BSO4-832-10-U 8-32 5/16" 0.312" 0.156" 0.050" 0.281" 0.280" 0.310" N/A
BSO4-832-12-U 8-32 5/16" 0.375" 0.156" 0.050" 0.281" 0.280" 0.310" N/A
BSO4-832-14-U 8-32 5/16" 0.437" 0.187" 0.050" 0.281" 0.280" 0.310" N/A
BSO4-832-16-U 8-32 5/16" 0.500" 0.250" 0.050" 0.281" 0.280" 0.310" N/A
BSO4-832-18-U 8-32 5/16" 0.562" 0.250" 0.050" 0.281" 0.280" 0.310" N/A
BSO4-832-20-U 8-32 5/16" 0.625" 0.250" 0.050" 0.281" 0.280" 0.310" N/A
BSO4-832-22-U 8-32 5/16" 0.687" 0.375" 0.050" 0.281" 0.280" 0.310" N/A
BSO4-832-24-U 8-32 5/16" 0.750" 0.375" 0.050" 0.281" 0.280" 0.310" N/A
BSO4-832-26-U 8-32 5/16" 0.812" 0.375" 0.050" 0.281" 0.280" 0.310" N/A
BSO4-832-28-U 8-32 5/16" 0.875" 0.375" 0.050" 0.281" 0.280" 0.310" N/A
BSO4-832-30-U 8-32 5/16" 0.937" 0.375" 0.050" 0.281" 0.280" 0.310" N/A
BSO4-832-32-U 8-32 5/16" 1.000" 0.375" 0.050" 0.281" 0.280" 0.310" N/A
BSO4-832-34-U 8-32 5/16" 1.062" 0.375" 0.050" 0.281" 0.280" 0.310" N/A
 
BSO4-1032-4-U 10-32 5/16" 0.125" 0.156" 0.050" 0.281" 0.280" 0.310" N/A
BSO4-1032-6-U 10-32 5/16" 0.187" 0.156" 0.050" 0.281" 0.280" 0.310" N/A
BSO4-1032-8-U 10-32 5/16" 0.250" 0.156" 0.050" 0.281" 0.280" 0.310" N/A
BSO4-1032-10-U 10-32 5/16" 0.312" 0.156" 0.050" 0.281" 0.280" 0.310" N/A
BSO4-1032-12-U 10-32 5/16" 0.375" 0.156" 0.050" 0.281" 0.280" 0.310" N/A
BSO4-1032-14-U 10-32 5/16" 0.437" 0.187" 0.050" 0.281" 0.280" 0.310" N/A
BSO4-1032-16-U 10-32 5/16" 0.500" 0.250" 0.050" 0.281" 0.280" 0.310" N/A
BSO4-1032-18-U 10-32 5/16" 0.562" 0.250" 0.050" 0.281" 0.280" 0.310" N/A
BSO4-1032-20-U 10-32 5/16" 0.625" 0.250" 0.050" 0.281" 0.280" 0.310" N/A
BSO4-1032-22-U 10-32 5/16" 0.687" 0.375" 0.050" 0.281" 0.280" 0.310" N/A
BSO4-1032-24-U 10-32 5/16" 0.750" 0.375" 0.050" 0.281" 0.280" 0.310" N/A
BSO4-1032-26-U 10-32 5/16" 0.812" 0.375" 0.050" 0.281" 0.280" 0.310" N/A
BSO4-1032-28-U 10-32 5/16" 0.875" 0.375" 0.050" 0.281" 0.280" 0.310" N/A
BSO4-1032-30-U 10-32 5/16" 0.937" 0.375" 0.050" 0.281" 0.280" 0.310" N/A
BSO4-1032-32-U 10-32 5/16" 1.000" 0.375" 0.050" 0.281" 0.280" 0.310" N/A
BSO4-1032-34-U 10-32 5/16" 1.062" 0.375" 0.050" 0.281" 0.280" 0.310" N/A
Series  BSO4-U  /  Metric Sizes
      • Head Shape-  Hex
      • Sheet Hardness-  HRB 88 / HB 176 or Less
      • Material-  400 Series Stainless Steel
      • Finish-  Passivated per ASTM A380
Series BSO4-U
Metric Sizes
Part
Number
Thread "H"
Nom.
"L"
Body
Length
"F"
Full Thread
Min. Depth
Min.
Sheet
Thickness
Hole
Size in
Sheet
"C"
Barrel
O.D.
Min.
Distance
to Edge
Mil-Spec
BSO4-M3-6-U M3 x 0.5 4.80
mm
6.00
mm
3.20
mm
1.00
mm
4.22
mm
4.20
mm
6.00
mm
N/A
BSO4-M3-8-U M3 x 0.5 4.80
mm
8.00
mm
4.00
mm
1.00
mm
4.22
mm
4.20
mm
6.00
mm
N/A
BSO4-M3-10-U M3 x 0.5 4.80
mm
10.00
mm
4.00
mm
1.00
mm
4.22
mm
4.20
mm
6.00
mm
N/A
BSO4-M3-12-U M3 x 0.5 4.80
mm
12.00
mm
5.00
mm
1.00
mm
4.22
mm
4.20
mm
6.00
mm
N/A
BSO4-M3-14-U M3 x 0.5 4.80
mm
14.00
mm
6.50
mm
1.00
mm
4.22
mm
4.20
mm
6.00
mm
N/A
BSO4-M3-16-U M3 x 0.5 4.80
mm
16.00
mm
6.50
mm
1.00
mm
4.22
mm
4.20
mm
6.00
mm
N/A
BSO4-M3-18-U M3 x 0.5 4.80
mm
18.00
mm
9.50
mm
1.00
mm
4.22
mm
4.20
mm
6.00
mm
N/A
BSO4-M3-20-U M3 x 0.5 4.80
mm
20.00
mm
9.50
mm
1.00
mm
4.22
mm
4.20
mm
6.00
mm
N/A
BSO4-M3-22-U M3 x 0.5 4.80
mm
22.00
mm
9.50
mm
1.00
mm
4.22
mm
4.20
mm
6.00
mm
N/A
BSO4-M3-25-U M3 x 0.5 4.80
mm
25.00
mm
9.50
mm
1.00
mm
4.22
mm
4.20
mm
6.00
mm
N/A
 
BSO4-3.5M3-6-U M3 x 0.5 6.40
mm
6.00
mm
3.20
mm
1.00
mm
5.41
mm
5.39
mm
6.80
mm
N/A
BSO4-3.5M3-8-U M3 x 0.5 6.40
mm
8.00
mm
4.00
mm
1.00
mm
5.41
mm
5.39
mm
6.80
mm
N/A
BSO4-3.5M3-10-U M3 x 0.5 6.40
mm
10.00
mm
4.00
mm
1.00
mm
5.41
mm
5.39
mm
6.80
mm
N/A
BSO4-3.5M3-12-U M3 x 0.5 6.40
mm
12.00
mm
5.00
mm
1.00
mm
5.41
mm
5.39
mm
6.80
mm
N/A
BSO4-3.5M3-14-U M3 x 0.5 6.40
mm
14.00
mm
6.50
mm
1.00
mm
5.41
mm
5.39
mm
6.80
mm
N/A
BSO4-3.5M3-16-U M3 x 0.5 6.40
mm
16.00
mm
6.50
mm
1.00
mm
5.41
mm
5.39
mm
6.80
mm
N/A
BSO4-3.5M3-18-U M3 x 0.5 6.40
mm
18.00
mm
9.50
mm
1.00
mm
5.41
mm
5.39
mm
6.80
mm
N/A
BSO4-3.5M3-20-U M3 x 0.5 6.40
mm
20.00
mm
9.50
mm
1.00
mm
5.41
mm
5.39
mm
6.80
mm
N/A
BSO4-3.5M3-22-U M3 x 0.5 6.40
mm
22.00
mm
9.50
mm
1.00
mm
5.41
mm
5.39
mm
6.80
mm
N/A
BSO4-3.5M3-25-U M3 x 0.5 6.40
mm
25.00
mm
9.50
mm
1.00
mm
5.41
mm
5.39
mm
6.80
mm
N/A
 
BSO4-M3.5-6-U M3.5 x 0.6 6.40
mm
6.00
mm
3.20
mm
1.00
mm
5.41
mm
5.39
mm
6.80
mm
N/A
BSO4-M3.5-8-U M3.5 x 0.6 6.40
mm
8.00
mm
4.00
mm
1.00
mm
5.41
mm
5.39
mm
6.80
mm
N/A
BSO4-M3.5-10-U M3.5 x 0.6 6.40
mm
10.00
mm
4.00
mm
1.00
mm
5.41
mm
5.39
mm
6.80
mm
N/A
BSO4-M3.5-12-U M3.5 x 0.6 6.40
mm
12.00
mm
5.00
mm
1.00
mm
5.41
mm
5.39
mm
6.80
mm
N/A
BSO4-M3.5-14-U M3.5 x 0.6 6.40
mm
14.00
mm
6.50
mm
1.00
mm
5.41
mm
5.39
mm
6.80
mm
N/A
BSO4-M3.5-16-U M3.5 x 0.6 6.40
mm
16.00
mm
6.50
mm
1.00
mm
5.41
mm
5.39
mm
6.80
mm
N/A
BSO4-M3.5-18-U M3.5 x 0.6 6.40
mm
18.00
mm
9.50
mm
1.00
mm
5.41
mm
5.39
mm
6.80
mm
N/A
BSO4-M3.5-20-U M3.5 x 0.6 6.40
mm
20.00
mm
9.50
mm
1.00
mm
5.41
mm
5.39
mm
6.80
mm
N/A
BSO4-M3.5-22-U M3.5 x 0.6 6.40
mm
22.00
mm
9.50
mm
1.00
mm
5.41
mm
5.39
mm
6.80
mm
N/A
BSO4-M3.5-25-U M3.5 x 0.6 6.40
mm
25.00
mm
9.50
mm
1.00
mm
5.41
mm
5.39
mm
6.80
mm
N/A
 
BSO4-M4-6-U M4 x 0.7 7.90
mm
6.00
mm
4.00
mm
1.27
mm
7.14
mm
7.12
mm
8.00
mm
N/A
BSO4-M4-8-U M4 x 0.7 7.90
mm
8.00
mm
4.00
mm
1.27
mm
7.14
mm
7.12
mm
8.00
mm
N/A
BSO4-M4-10-U M4 x 0.7 7.90
mm
10.00
mm
4.00
mm
1.27
mm
7.14
mm
7.12
mm
8.00
mm
N/A
BSO4-M4-12-U M4 x 0.7 7.90
mm
12.00
mm
5.00
mm
1.27
mm
7.14
mm
7.12
mm
8.00
mm
N/A
BSO4-M4-14-U M4 x 0.7 7.90
mm
14.00
mm
6.50
mm
1.27
mm
7.14
mm
7.12
mm
8.00
mm
N/A
BSO4-M4-16-U M4 x 0.7 7.90
mm
16.00
mm
6.50
mm
1.27
mm
7.14
mm
7.12
mm
8.00
mm
N/A
BSO4-M4-18-U M4 x 0.7 7.90
mm
18.00
mm
9.50
mm
1.27
mm
7.14
mm
7.12
mm
8.00
mm
N/A
BSO4-M4-20-U M4 x 0.7 7.90
mm
20.00
mm
9.50
mm
1.27
mm
7.14
mm
7.12
mm
8.00
mm
N/A
BSO4-M4-22-U M4 x 0.7 7.90
mm
22.00
mm
9.50
mm
1.27
mm
7.14
mm
7.12
mm
8.00
mm
N/A
BSO4-M4-25-U M4 x 0.7 7.90
mm
25.00
mm
9.50
mm
1.27
mm
7.14
mm
7.12
mm
8.00
mm
N/A
 
BSO4-M5-6-U M5 x 0.8 7.90
mm
6.00
mm
4.00
mm
1.27
mm
7.14
mm
7.12
mm
8.00
mm
N/A
BSO4-M5-8-U M5 x 0.8 7.90
mm
8.00
mm
4.00
mm
1.27
mm
7.14
mm
7.12
mm
8.00
mm
N/A
BSO4-M5-10-U M5 x 0.8 7.90
mm
10.00
mm
4.00
mm
1.27
mm
7.14
mm
7.12
mm
8.00
mm
N/A
BSO4-M5-12-U M5 x 0.8 7.90
mm
12.00
mm
5.00
mm
1.27
mm
7.14
mm
7.12
mm
8.00
mm
N/A
BSO4-M5-14-U M5 x 0.8 7.90
mm
14.00
mm
6.50
mm
1.27
mm
7.14
mm
7.12
mm
8.00
mm
N/A
BSO4-M5-16-U M5 x 0.8 7.90
mm
16.00
mm
6.50
mm
1.27
mm
7.14
mm
7.12
mm
8.00
mm
N/A
BSO4-M5-18-U M5 x 0.8 7.90
mm
18.00
mm
9.50
mm
1.27
mm
7.14
mm
7.12
mm
8.00
mm
N/A
BSO4-M5-20-U M5 x 0.8 7.90
mm
20.00
mm
9.50
mm
1.27
mm
7.14
mm
7.12
mm
8.00
mm
N/A
BSO4-M5-22-U M5 x 0.8 7.90
mm
22.00
mm
9.50
mm
1.27
mm
7.14
mm
7.12
mm
8.00
mm
N/A
BSO4-M5-25-U M5 x 0.8 7.90
mm
25.00
mm
9.50
mm
1.27
mm
7.14
mm
7.12
mm
8.00
mm
N/A

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