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Locking Thread Nuts  LK-U,  LKS-U,  LKA-U

Self Clinching Fasteners  •  Nuts For Sheet Metal
American Standard (Inches) & Metric Sizes
• Self-clinching    • Self-locking    • Flanged    • Permanent attachment    • Repeat locking torque
• Reusable    • Less likely to have damage from mating screw
• Installed quickly and easily    • All metal
American Standard Sizes:   • Series LK-U    • Series LKS-U    • Series LKA-U
Metric Sizes:   • Series LK-U    • Series LKS-U    • Series LKA-U
Series  LK-U
Series  LK-U  /  American Standard Sizes
      • Shape-  Round
      • Anvil Diameter-  0.500"
      • Anvil Depth-  0.218"
      • Breaker Corner-  0.005"
      • Punch Diameter-  0.500"
      • Sheet Hardness-  HRB 70 / HB 125 or Less
      • Fastener Materials-  Carbon Steel
      • Finish-  Black, Dry-film Lubricant over Zinc Phosphate
      • Mil-Spec-  N/A
Series LK-U
American Standard Sizes
(SAE)
Part
Number
Thread "A"
(Shank)
Max.
"E"
Nom.
"C"
Max.
"D"
Max.
"T" Min.
Sheet
Thickness
Hole
Size in
Sheet
Min.
Distance
to Edge
LK-256-1MD-U 2-56 0.038" 0.250" 0.171" 0.165" 0.135" 0.040" 0.172" 0.156"
LK-256-2MD-U 2-56 0.054" 0.250" 0.171" 0.165" 0.135" 0.056" 0.172" 0.156"
 
LK-440-1MD-U 4-40 0.038" 0.250" 0.186" 0.185" 0.135" 0.040" 0.187" 0.156"
LK-440-2MD-U 4-40 0.054" 0.250" 0.186" 0.185" 0.135" 0.056" 0.187" 0.156"
 
LK-632-1MD-U 6-32 0.038" 0.312" 0.218" 0.220" 0.145" 0.040" 0.219" 0.187"
LK-632-2MD-U 6-32 0.054" 0.312" 0.218" 0.220" 0.145" 0.056" 0.219" 0.187"
 
LK-832-1MD-U 8-32 0.038" 0.343" 0.265" 0.250" 0.175" 0.040" 0.266" 0.203"
LK-832-2MD-U 8-32 0.054" 0.343" 0.265" 0.250" 0.175" 0.056" 0.266" 0.203"
 
LK-032-1MD-U 10-32 0.038" 0.375" 0.311" 0.285" 0.205" 0.040" 0.312" 0.218"
LK-032-2MD-U 10-32 0.054" 0.375" 0.311" 0.285" 0.205" 0.056" 0.312" 0.218"
Series  LK-U  /  Metric Sizes
      • Shape-  Round
      • Anvil Diameter-  13.00 mm
      • Anvil Depth-  5.50 mm
      • Breaker Corner-  0.13 mm
      • Punch Diameter-  13.00 mm
      • Sheet Hardness-  HRB 70 / HB 125 or Less
      • Fastener Materials-  Carbon Steel
      • Finish-  Black, Dry-film Lubricant over Zinc Phosphate
      • Mil-Spec-  N/A
Series LK-U
Metric Sizes
Part
Number
Thread "A"
(Shank)
Max.
"E"
Nom.
"C"
Max.
"D"
Max.
"T" Min.
Sheet
Thickness
Hole
Size in
Sheet
Min.
Distance
to Edge
LK-M2.5-1MD-U M2.5 x 0.45 0.97
mm
6.35
mm
4.35
mm
4.45
mm
3.43
mm
1.00
mm
4.37
mm
3.90
mm
LK-M2.5-2MD-U M2.5 x 0.45 1.38
mm
6.35
mm
4.35
mm
4.45
mm
3.43
mm
1.40
mm
4.37
mm
3.90
mm
 
LK-M3-1MD-U M3 x 0.5 0.97
mm
6.35
mm
4.73
mm
4.85
mm
3.43
mm
1.00
mm
4.75
mm
4.00
mm
LK-M3-2MD-U M3 x 0.5 1.38
mm
6.35
mm
4.73
mm
4.85
mm
3.43
mm
1.40
mm
4.75
mm
4.00
mm
 
LK-M4-1MD-U M4 x 0.7 0.97
mm
8.73
mm
6.73
mm
6.20
mm
4.45
mm
1.00
mm
6.76
mm
5.20
mm
LK-M4-2MD-U M4 x 0.7 1.38
mm
8.73
mm
6.73
mm
6.20
mm
4.45
mm
1.40
mm
6.76
mm
5.20
mm
 
LK-M5-1MD-U M5 x 0.8 0.97
mm
9.53
mm
7.90
mm
7.40
mm
5.21
mm
1.00
mm
7.92
mm
5.60
mm
LK-M5-2MD-U M5 x 0.8 1.38
mm
9.53
mm
7.90
mm
7.40
mm
5.21
mm
1.40
mm
7.92
mm
5.60
mm
Series  LKS-U
Series  LKS-U  /  American Standard Sizes
      • Shape-  Round
      • Anvil Diameter-  0.500"
      • Anvil Depth-  0.218"
      • Breaker Corner-  0.005"
      • Punch Diameter-  0.500"
      • Sheet Hardness-  HRB 70 / HB 125 or Less
      • Fastener Materials-  300 Series Stainless Steel
      • Finish-  Black, Dry-Film Lubricant
      • Mil-Spec-  N/A
Series LKS-U
American Standard Sizes
(SAE)
Part
Number
Thread "A"
(Shank)
Max.
"E"
Nom.
"C"
Max.
"D"
Max.
"T" Min.
Sheet
Thickness
Hole
Size in
Sheet
Min.
Distance
to Edge
LKS-256-1MD-U 2-56 0.038" 0.250" 0.171" 0.165" 0.135" 0.040" 0.172" 0.156"
LKS-256-2MD-U 2-56 0.054" 0.250" 0.171" 0.165" 0.135" 0.056" 0.172" 0.156"
 
LKS-440-1MD-U 4-40 0.038" 0.250" 0.186" 0.185" 0.135" 0.040" 0.187" 0.156"
LKS-440-2MD-U 4-40 0.054" 0.250" 0.186" 0.185" 0.135" 0.056" 0.187" 0.156"
 
LKS-632-1MD-U 6-32 0.038" 0.312" 0.218" 0.220" 0.145" 0.040" 0.219" 0.187"
LKS-632-2MD-U 6-32 0.054" 0.312" 0.218" 0.220" 0.145" 0.056" 0.219" 0.187"
 
LKS-832-1MD-U 8-32 0.038" 0.343" 0.265" 0.250" 0.175" 0.040" 0.266" 0.203"
LKS-832-2MD-U 8-32 0.054" 0.343" 0.265" 0.250" 0.175" 0.056" 0.266" 0.203"
 
LKS-032-1MD-U 10-32 0.038" 0.375" 0.311" 0.285" 0.205" 0.040" 0.312" 0.218"
LKS-032-2MD-U 10-32 0.054" 0.375" 0.311" 0.285" 0.205" 0.056" 0.312" 0.218"
Series  LKS-U  /  Metric Sizes
      • Shape-  Round
      • Anvil Diameter-  13.00 mm
      • Anvil Depth-  5.50 mm
      • Breaker Corner-  0.13 mm
      • Punch Diameter-  13.00 mm
      • Sheet Hardness-  HRB 70 / HB 125 or Less
      • Fastener Materials-  300 Series Stainless Steel
      • Finish-  Black, Dry-Film Lubricant
      • Mil-Spec-  N/A
Series LKS-U
Metric Sizes
Part
Number
Thread "A"
(Shank)
Max.
"E"
Nom.
"C"
Max.
"D"
Max.
"T" Min.
Sheet
Thickness
Hole
Size in
Sheet
Min.
Distance
to Edge
LKS-M2.5-1MD-U M2.5 x 0.45 0.97
mm
6.35
mm
4.35
mm
4.45
mm
3.43
mm
1.00
mm
4.37
mm
3.90
mm
LKS-M2.5-2MD-U M2.5 x 0.45 1.38
mm
6.35
mm
4.35
mm
4.45
mm
3.43
mm
1.40
mm
4.37
mm
3.90
mm
 
LKS-M3-1MD-U M3 x 0.5 0.97
mm
6.35
mm
4.73
mm
4.85
mm
3.43
mm
1.00
mm
4.75
mm
4.00
mm
LKS-M3-2MD-U M3 x 0.5 1.38
mm
6.35
mm
4.73
mm
4.85
mm
3.43
mm
1.40
mm
4.75
mm
4.00
mm
 
LKS-M4-1MD-U M4 x 0.7 0.97
mm
8.73
mm
6.73
mm
6.20
mm
4.45
mm
1.00
mm
6.76
mm
5.20
mm
LKS-M4-2MD-U M4 x 0.7 1.38
mm
8.73
mm
6.73
mm
6.20
mm
4.45
mm
1.40
mm
6.76
mm
5.20
mm
 
LKS-M5-1MD-U M5 x 0.8 0.97
mm
9.53
mm
7.90
mm
7.40
mm
5.21
mm
1.00
mm
7.92
mm
5.60
mm
LKS-M5-2MD-U M5 x 0.8 1.38
mm
9.53
mm
7.90
mm
7.40
mm
5.21
mm
1.40
mm
7.92
mm
5.60
mm
Series  LKA-U
Series  LKA-U  /  American Standard Sizes
      • Shape-  Round
      • Anvil Diameter-  0.500"
      • Anvil Depth-  0.218"
      • Breaker Corner-  0.005"
      • Punch Diameter-  0.500"
      • Sheet Hardness-  HRB 50 / HB 82 or Less
      • Fastener Materials-  7075-T6 Aluminum
      • Finish-  Plain
      • Mil-Spec-  N/A
Series LKA-U
American Standard Sizes
(SAE)
Part
Number
Thread "A"
(Shank)
Max.
"E"
Nom.
"C"
Max.
"D"
Max.
"T" Min.
Sheet
Thickness
Hole
Size in
Sheet
Min.
Distance
to Edge
LKA-256-1-U 2-56 0.038" 0.250" 0.171" 0.165" 0.135" 0.040" 0.172" 0.156"
LKA-256-2-U 2-56 0.054" 0.250" 0.171" 0.165" 0.135" 0.056" 0.172" 0.156"
 
LKA-440-1-U 4-40 0.038" 0.250" 0.186" 0.185" 0.135" 0.040" 0.187" 0.156"
LKA-440-2-U 4-40 0.054" 0.250" 0.186" 0.185" 0.135" 0.056" 0.187" 0.156"
 
LKA-632-1-U 6-32 0.038" 0.312" 0.218" 0.220" 0.145" 0.040" 0.219" 0.187"
LKA-632-2-U 6-32 0.054" 0.312" 0.218" 0.220" 0.145" 0.056" 0.219" 0.187"
 
LKA-832-1-U 8-32 0.038" 0.343" 0.265" 0.250" 0.175" 0.040" 0.266" 0.203"
LKA-832-2-U 8-32 0.054" 0.343" 0.265" 0.250" 0.175" 0.056" 0.266" 0.203"
 
LKA-032-1-U 10-32 0.038" 0.375" 0.311" 0.285" 0.205" 0.040" 0.312" 0.218"
LKA-032-2-U 10-32 0.054" 0.375" 0.311" 0.285" 0.205" 0.056" 0.312" 0.218"
Series  LKA-U  /  Metric Sizes
      • Shape-  Round
      • Anvil Diameter-  13.00 mm
      • Anvil Depth-  5.50 mm
      • Breaker Corner-  0.13 mm
      • Punch Diameter-  13.00 mm
      • Sheet Hardness-  HRB 50 / HB 82 or Less
      • Fastener Materials-  7075-T6 Aluminum
      • Finish-  Plain
      • Mil-Spec-  N/A
Series LKA-U
Metric Sizes
Part
Number
Thread "A"
(Shank)
Max.
"E"
Nom.
"C"
Max.
"D"
Max.
"T" Min.
Sheet
Thickness
Hole
Size in
Sheet
Min.
Distance
to Edge
LKA-M2.5-1-U M2.5 x 0.45 0.97
mm
6.35
mm
4.35
mm
4.45
mm
3.43
mm
1.00
mm
4.37
mm
3.90
mm
LKA-M2.5-2-U M2.5 x 0.45 1.38
mm
6.35
mm
4.35
mm
4.45
mm
3.43
mm
1.40
mm
4.37
mm
3.90
mm
 
LKA-M3-1-U M3 x 0.5 0.97
mm
6.35
mm
4.73
mm
4.85
mm
3.43
mm
1.00
mm
4.75
mm
4.00
mm
LKA-M3-2-U M3 x 0.5 1.38
mm
6.35
mm
4.73
mm
4.85
mm
3.43
mm
1.40
mm
4.75
mm
4.00
mm
 
LKA-M4-1-U M4 x 0.7 0.97
mm
8.73
mm
6.73
mm
6.20
mm
4.45
mm
1.00
mm
6.76
mm
5.20
mm
LKA-M4-2-U M4 x 0.7 1.38
mm
8.73
mm
6.73
mm
6.20
mm
4.45
mm
1.40
mm
6.76
mm
5.20
mm
 
LKA-M5-1-U M5 x 0.8 0.97
mm
9.53
mm
7.90
mm
7.40
mm
5.21
mm
1.00
mm
7.92
mm
5.60
mm
LKA-M5-2-U M5 x 0.8 1.38
mm
9.53
mm
7.90
mm
7.40
mm
5.21
mm
1.40
mm
7.92
mm
5.60
mm

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electronic hardware, handles and precision fasteners used by leading companies
in nearly every industry since 1971.


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