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Thru Hole Unthreaded Standoffs  SO-U

Self Clinching Fasteners  •  Standoffs For Sheet Metal
American Standard (Inches) & Metric Sizes
• Self-clinching    • Unthreaded    • Installed quickly and easily in metal panels as thin as 0.040" /1.00 mm
• Installed using pneumatic, hydraulic, or mechanical press    • No secondary operation needed prior to installation
• With thru-hole standoff, outer sheet surface is flush but not closed
American Standard Sizes:   • Series SO-U
Metric Sizes:   • Series SO-U
Series  SO-U
Series  SO-U  /  American Standard Sizes
      • Head Shape-  Hex
      • Sheet Hardness-  HRB 80 / HB 150 or Less
      • Material-  Heat-Treated Carbon Steel
      • Finish-  Zinc Clear Plated per ASTM B633
Series SO-U
American Standard Sizes
(SAE)
Part
Number
"H"
Nom.
"L"
Body
Length
"B"
Thru-Hole
Diameter
Min.
Sheet
Thickness
Hole
Size in
Sheet
"C"
Barrel
O.D.
Min.
Distance
to Edge
Mil-Spec
SO-4116-4ZI-U 3/16" 0.125" 0.116" 0.040" 0.166" 0.165" 0.230" N/A
SO-4116-6ZI-U 3/16" 0.187" 0.116" 0.040" 0.166" 0.165" 0.230" N/A
SO-4116-8ZI-U 3/16" 0.250" 0.116" 0.040" 0.166" 0.165" 0.230" N/A
SO-4116-10ZI-U 3/16" 0.312" 0.116" 0.040" 0.166" 0.165" 0.230" N/A
SO-4116-12ZI-U 3/16" 0.375" 0.116" 0.040" 0.166" 0.165" 0.230" N/A
SO-4116-14ZI-U 3/16" 0.437" 0.116" 0.040" 0.166" 0.165" 0.230" N/A
SO-4116-16ZI-U 3/16" 0.500" 0.116" 0.040" 0.166" 0.165" 0.230" N/A
SO-4116-18ZI-U 3/16" 0.562" 0.116" 0.040" 0.166" 0.165" 0.230" N/A
SO-4116-20ZI-U 3/16" 0.625" 0.116" 0.040" 0.166" 0.165" 0.230" N/A
SO-4116-22ZI-U 3/16" 0.687" 0.116" 0.040" 0.166" 0.165" 0.230" N/A
SO-4116-24ZI-U 3/16" 0.750" 0.116" 0.040" 0.166" 0.165" 0.230" N/A
 
SO-6116-4ZI-U 1/4" 0.125" 0.116" 0.040" 0.213" 0.212" 0.270" N/A
SO-6116-6ZI-U 1/4" 0.187" 0.116" 0.040" 0.213" 0.212" 0.270" N/A
SO-6116-8ZI-U 1/4" 0.250" 0.116" 0.040" 0.213" 0.212" 0.270" N/A
SO-6116-10ZI-U 1/4" 0.312" 0.116" 0.040" 0.213" 0.212" 0.270" N/A
SO-6116-12ZI-U 1/4" 0.375" 0.116" 0.040" 0.213" 0.212" 0.270" N/A
SO-6116-14ZI-U 1/4" 0.437" 0.116" 0.040" 0.213" 0.212" 0.270" N/A
SO-6116-16ZI-U 1/4" 0.500" 0.116" 0.040" 0.213" 0.212" 0.270" N/A
SO-6116-18ZI-U 1/4" 0.562" 0.116" 0.040" 0.213" 0.212" 0.270" N/A
SO-6116-20ZI-U 1/4" 0.625" 0.116" 0.040" 0.213" 0.212" 0.270" N/A
SO-6116-22ZI-U 1/4" 0.687" 0.116" 0.040" 0.213" 0.212" 0.270" N/A
SO-6116-24ZI-U 1/4" 0.750" 0.116" 0.040" 0.213" 0.212" 0.270" N/A
 
SO-6143-4ZI-U 1/4" 0.125" 0.143" 0.040" 0.213" 0.212" 0.270" N/A
SO-6143-6ZI-U 1/4" 0.187" 0.143" 0.040" 0.213" 0.212" 0.270" N/A
SO-6143-8ZI-U 1/4" 0.250" 0.143" 0.040" 0.213" 0.212" 0.270" N/A
SO-6143-10ZI-U 1/4" 0.312" 0.143" 0.040" 0.213" 0.212" 0.270" N/A
SO-6143-12ZI-U 1/4" 0.375" 0.143" 0.040" 0.213" 0.212" 0.270" N/A
SO-6143-14ZI-U 1/4" 0.437" 0.143" 0.040" 0.213" 0.212" 0.270" N/A
SO-6143-16ZI-U 1/4" 0.500" 0.143" 0.040" 0.213" 0.212" 0.270" N/A
SO-6143-18ZI-U 1/4" 0.562" 0.143" 0.040" 0.213" 0.212" 0.270" N/A
SO-6143-20ZI-U 1/4" 0.625" 0.143" 0.040" 0.213" 0.212" 0.270" N/A
SO-6143-22ZI-U 1/4" 0.687" 0.143" 0.040" 0.213" 0.212" 0.270" N/A
SO-6143-24ZI-U 1/4" 0.750" 0.143" 0.040" 0.213" 0.212" 0.270" N/A
 
SO-8143-4ZI-U 5/16" 0.125" 0.143" 0.050" 0.281" 0.280" 0.310" N/A
SO-8143-6ZI-U 5/16" 0.187" 0.143" 0.050" 0.281" 0.280" 0.310" N/A
SO-8143-8ZI-U 5/16" 0.250" 0.143" 0.050" 0.281" 0.280" 0.310" N/A
SO-8143-10ZI-U 5/16" 0.312" 0.143" 0.050" 0.281" 0.280" 0.310" N/A
SO-8143-12ZI-U 5/16" 0.375" 0.143" 0.050" 0.281" 0.280" 0.310" N/A
SO-8143-14ZI-U 5/16" 0.437" 0.143" 0.050" 0.281" 0.280" 0.310" N/A
SO-8143-16ZI-U 5/16" 0.500" 0.143" 0.050" 0.281" 0.280" 0.310" N/A
SO-8143-18ZI-U 5/16" 0.562" 0.143" 0.050" 0.281" 0.280" 0.310" N/A
SO-8143-20ZI-U 5/16" 0.625" 0.143" 0.050" 0.281" 0.280" 0.310" N/A
SO-8143-22ZI-U 5/16" 0.687" 0.143" 0.050" 0.281" 0.280" 0.310" N/A
SO-8143-24ZI-U 5/16" 0.750" 0.143" 0.050" 0.281" 0.280" 0.310" N/A
 
SO-8169-4ZI-U 5/16" 0.125" 0.169" 0.050" 0.281" 0.280" 0.310" N/A
SO-8169-6ZI-U 5/16" 0.187" 0.169" 0.050" 0.281" 0.280" 0.310" N/A
SO-8169-8ZI-U 5/16" 0.250" 0.169" 0.050" 0.281" 0.280" 0.310" N/A
SO-8169-10ZI-U 5/16" 0.312" 0.169" 0.050" 0.281" 0.280" 0.310" N/A
SO-8169-12ZI-U 5/16" 0.375" 0.169" 0.050" 0.281" 0.280" 0.310" N/A
SO-8169-14ZI-U 5/16" 0.437" 0.169" 0.050" 0.281" 0.280" 0.310" N/A
SO-8169-16ZI-U 5/16" 0.500" 0.169" 0.050" 0.281" 0.280" 0.310" N/A
SO-8169-18ZI-U 5/16" 0.562" 0.169" 0.050" 0.281" 0.280" 0.310" N/A
SO-8169-20ZI-U 5/16" 0.625" 0.169" 0.050" 0.281" 0.280" 0.310" N/A
SO-8169-22ZI-U 5/16" 0.687" 0.169" 0.050" 0.281" 0.280" 0.310" N/A
SO-8169-24ZI-U 5/16" 0.750" 0.169" 0.050" 0.281" 0.280" 0.310" N/A
 
SO-8194-4ZI-U 5/16" 0.125" 0.194" 0.050" 0.281" 0.280" 0.310" N/A
SO-8194-6ZI-U 5/16" 0.187" 0.194" 0.050" 0.281" 0.280" 0.310" N/A
SO-8194-8ZI-U 5/16" 0.250" 0.194" 0.050" 0.281" 0.280" 0.310" N/A
SO-8194-10ZI-U 5/16" 0.312" 0.194" 0.050" 0.281" 0.280" 0.310" N/A
SO-8194-12ZI-U 5/16" 0.375" 0.194" 0.050" 0.281" 0.280" 0.310" N/A
SO-8194-14ZI-U 5/16" 0.437" 0.194" 0.050" 0.281" 0.280" 0.310" N/A
SO-8194-16ZI-U 5/16" 0.500" 0.194" 0.050" 0.281" 0.280" 0.310" N/A
SO-8194-18ZI-U 5/16" 0.562" 0.194" 0.050" 0.281" 0.280" 0.310" N/A
SO-8194-20ZI-U 5/16" 0.625" 0.194" 0.050" 0.281" 0.280" 0.310" N/A
SO-8194-22ZI-U 5/16" 0.687" 0.194" 0.050" 0.281" 0.280" 0.310" N/A
SO-8194-24ZI-U 5/16" 0.750" 0.194" 0.050" 0.281" 0.280" 0.310" N/A
Series  SO-U  /  Metric Sizes
      • Head Shape-  Hex
      • Sheet Hardness-  HRB 80 / HB 150 or Less
      • Material-  Heat-Treated Carbon Steel
      • Finish-  Zinc Clear Plated per ASTM B633
Series SO-U
Metric Sizes
Part
Number
"H"
Nom.
"L"
Body
Length
"B"
Thru-Hole
Diameter
Min.
Sheet
Thickness
Hole
Size in
Sheet
"C"
Barrel
O.D.
Min.
Distance
to Edge
Mil-Spec
SO-43.1-3ZI-U 4.80
mm
3.00
mm
3.10
mm
1.00
mm
4.22
mm
4.20
mm
6.00
mm
N/A
SO-43.1-4ZI-U 4.80
mm
4.00
mm
3.10
mm
1.00
mm
4.22
mm
4.20
mm
6.00
mm
N/A
SO-43.1-6ZI-U 4.80
mm
6.00
mm
3.10
mm
1.00
mm
4.22
mm
4.20
mm
6.00
mm
N/A
SO-43.1-8ZI-U 4.80
mm
8.00
mm
3.10
mm
1.00
mm
4.22
mm
4.20
mm
6.00
mm
N/A
SO-43.1-10ZI-U 4.80
mm
10.00
mm
3.10
mm
1.00
mm
4.22
mm
4.20
mm
6.00
mm
N/A
SO-43.1-12ZI-U 4.80
mm
12.00
mm
3.10
mm
1.00
mm
4.22
mm
4.20
mm
6.00
mm
N/A
SO-43.1-14ZI-U 4.80
mm
14.00
mm
3.10
mm
1.00
mm
4.22
mm
4.20
mm
6.00
mm
N/A
SO-43.1-16ZI-U 4.80
mm
16.00
mm
3.10
mm
1.00
mm
4.22
mm
4.20
mm
6.00
mm
N/A
SO-43.1-18ZI-U 4.80
mm
18.00
mm
3.10
mm
1.00
mm
4.22
mm
4.20
mm
6.00
mm
N/A
SO-43.1-20ZI-U 4.80
mm
20.00
mm
3.10
mm
1.00
mm
4.22
mm
4.20
mm
6.00
mm
N/A
 
SO-63.1-3ZI-U 6.40
mm
3.00
mm
3.10
mm
1.00
mm
5.41
mm
5.39
mm
6.80
mm
N/A
SO-63.1-4ZI-U 6.40
mm
4.00
mm
3.10
mm
1.00
mm
5.41
mm
5.39
mm
6.80
mm
N/A
SO-63.1-6ZI-U 6.40
mm
6.00
mm
3.10
mm
1.00
mm
5.41
mm
5.39
mm
6.80
mm
N/A
SO-63.1-8ZI-U 6.40
mm
8.00
mm
3.10
mm
1.00
mm
5.41
mm
5.39
mm
6.80
mm
N/A
SO-63.1-10ZI-U 6.40
mm
10.00
mm
3.10
mm
1.00
mm
5.41
mm
5.39
mm
6.80
mm
N/A
SO-63.1-12ZI-U 6.40
mm
12.00
mm
3.10
mm
1.00
mm
5.41
mm
5.39
mm
6.80
mm
N/A
SO-63.1-14ZI-U 6.40
mm
14.00
mm
3.10
mm
1.00
mm
5.41
mm
5.39
mm
6.80
mm
N/A
SO-63.1-16ZI-U 6.40
mm
16.00
mm
3.10
mm
1.00
mm
5.41
mm
5.39
mm
6.80
mm
N/A
SO-63.1-18ZI-U 6.40
mm
18.00
mm
3.10
mm
1.00
mm
5.41
mm
5.39
mm
6.80
mm
N/A
SO-63.1-20ZI-U 6.40
mm
20.00
mm
3.10
mm
1.00
mm
5.41
mm
5.39
mm
6.80
mm
N/A
 
SO-63.6-3ZI-U 6.40
mm
3.00
mm
3.60
mm
1.00
mm
5.41
mm
5.39
mm
6.80
mm
N/A
SO-63.6-4ZI-U 6.40
mm
4.00
mm
3.60
mm
1.00
mm
5.41
mm
5.39
mm
6.80
mm
N/A
SO-63.6-6ZI-U 6.40
mm
6.00
mm
3.60
mm
1.00
mm
5.41
mm
5.39
mm
6.80
mm
N/A
SO-63.6-8ZI-U 6.40
mm
8.00
mm
3.60
mm
1.00
mm
5.41
mm
5.39
mm
6.80
mm
N/A
SO-63.6-10ZI-U 6.40
mm
10.00
mm
3.60
mm
1.00
mm
5.41
mm
5.39
mm
6.80
mm
N/A
SO-63.6-12ZI-U 6.40
mm
12.00
mm
3.60
mm
1.00
mm
5.41
mm
5.39
mm
6.80
mm
N/A
SO-63.6-14ZI-U 6.40
mm
14.00
mm
3.60
mm
1.00
mm
5.41
mm
5.39
mm
6.80
mm
N/A
SO-63.6-16ZI-U 6.40
mm
16.00
mm
3.60
mm
1.00
mm
5.41
mm
5.39
mm
6.80
mm
N/A
SO-63.6-18ZI-U 6.40
mm
18.00
mm
3.60
mm
1.00
mm
5.41
mm
5.39
mm
6.80
mm
N/A
SO-63.6-20ZI-U 6.40
mm
20.00
mm
3.60
mm
1.00
mm
5.41
mm
5.39
mm
6.80
mm
N/A
 
SO-83.6-3ZI-U 7.90
mm
3.00
mm
3.60
mm
1.27
mm
7.14
mm
7.12
mm
8.00
mm
N/A
SO-83.6-4ZI-U 7.90
mm
4.00
mm
3.60
mm
1.27
mm
7.14
mm
7.12
mm
8.00
mm
N/A
SO-83.6-6ZI-U 7.90
mm
6.00
mm
3.60
mm
1.27
mm
7.14
mm
7.12
mm
8.00
mm
N/A
SO-83.6-8ZI-U 7.90
mm
8.00
mm
3.60
mm
1.27
mm
7.14
mm
7.12
mm
8.00
mm
N/A
SO-83.6-10ZI-U 7.90
mm
10.00
mm
3.60
mm
1.27
mm
7.14
mm
7.12
mm
8.00
mm
N/A
SO-83.6-12ZI-U 7.90
mm
12.00
mm
3.60
mm
1.27
mm
7.14
mm
7.12
mm
8.00
mm
N/A
SO-83.6-14ZI-U 7.90
mm
14.00
mm
3.60
mm
1.27
mm
7.14
mm
7.12
mm
8.00
mm
N/A
SO-83.6-16ZI-U 7.90
mm
16.00
mm
3.60
mm
1.27
mm
7.14
mm
7.12
mm
8.00
mm
N/A
SO-83.6-18ZI-U 7.90
mm
18.00
mm
3.60
mm
1.27
mm
7.14
mm
7.12
mm
8.00
mm
N/A
SO-83.6-20ZI-U 7.90
mm
20.00
mm
3.60
mm
1.27
mm
7.14
mm
7.12
mm
8.00
mm
N/A
 
SO-84.1-3ZI-U 7.90
mm
3.00
mm
4.10
mm
1.27
mm
7.14
mm
7.12
mm
8.00
mm
N/A
SO-84.1-4ZI-U 7.90
mm
4.00
mm
4.10
mm
1.27
mm
7.14
mm
7.12
mm
8.00
mm
N/A
SO-84.1-6ZI-U 7.90
mm
6.00
mm
4.10
mm
1.27
mm
7.14
mm
7.12
mm
8.00
mm
N/A
SO-84.1-8ZI-U 7.90
mm
8.00
mm
4.10
mm
1.27
mm
7.14
mm
7.12
mm
8.00
mm
N/A
SO-84.1-10ZI-U 7.90
mm
10.00
mm
4.10
mm
1.27
mm
7.14
mm
7.12
mm
8.00
mm
N/A
SO-84.1-12ZI-U 7.90
mm
12.00
mm
4.10
mm
1.27
mm
7.14
mm
7.12
mm
8.00
mm
N/A
SO-84.1-14ZI-U 7.90
mm
14.00
mm
4.10
mm
1.27
mm
7.14
mm
7.12
mm
8.00
mm
N/A
SO-84.1-16ZI-U 7.90
mm
16.00
mm
4.10
mm
1.27
mm
7.14
mm
7.12
mm
8.00
mm
N/A
SO-84.1-18ZI-U 7.90
mm
18.00
mm
4.10
mm
1.27
mm
7.14
mm
7.12
mm
8.00
mm
N/A
SO-84.1-20ZI-U 7.90
mm
20.00
mm
4.10
mm
1.27
mm
7.14
mm
7.12
mm
8.00
mm
N/A
 
SO-85.1-3ZI-U 7.90
mm
3.00
mm
5.10
mm
1.27
mm
7.14
mm
7.12
mm
8.00
mm
N/A
SO-85.1-4ZI-U 7.90
mm
4.00
mm
5.10
mm
1.27
mm
7.14
mm
7.12
mm
8.00
mm
N/A
SO-85.1-6ZI-U 7.90
mm
6.00
mm
5.10
mm
1.27
mm
7.14
mm
7.12
mm
8.00
mm
N/A
SO-85.1-8ZI-U 7.90
mm
8.00
mm
5.10
mm
1.27
mm
7.14
mm
7.12
mm
8.00
mm
N/A
SO-85.1-10ZI-U 7.90
mm
10.00
mm
5.10
mm
1.27
mm
7.14
mm
7.12
mm
8.00
mm
N/A
SO-85.1-12ZI-U 7.90
mm
12.00
mm
5.10
mm
1.27
mm
7.14
mm
7.12
mm
8.00
mm
N/A
SO-85.1-14ZI-U 7.90
mm
14.00
mm
5.10
mm
1.27
mm
7.14
mm
7.12
mm
8.00
mm
N/A
SO-85.1-16ZI-U 7.90
mm
16.00
mm
5.10
mm
1.27
mm
7.14
mm
7.12
mm
8.00
mm
N/A
SO-85.1-18ZI-U 7.90
mm
18.00
mm
5.10
mm
1.27
mm
7.14
mm
7.12
mm
8.00
mm
N/A
SO-85.1-20ZI-U 7.90
mm
20.00
mm
5.10
mm
1.27
mm
7.14
mm
7.12
mm
8.00
mm
N/A

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