LK LKS LKA Locking Thread Nuts

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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

UNICORP Electronic Hardware Self-Clinching Fasteners - Locking Thread Nuts LK, LKS, LKA

• 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

UNICORP Electronic Hardware - Self Clinching Fasteners

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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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