PennEngineering
PennEngineering
Corporate Headquarters – Danboro, PA
5190 Old Easton Rd.
Danboro, PA 18916
Phone: 215-766-8853
Toll-Free Phone: 1-800-237-4736 (U.S. only)
Email: info@pemnet.com
Website: www.pemnet.com
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PEM® PEMFLEX® self-locking, self-clinching fasteners retain their repeated use and effective prevailing locking torque.
  • Shoulder provides increased performance.
  • Flexing action permits repeated use and effective locking torque.
  • Flange provides positive stop during installation.
The thread locking performance of Types LK, LKA, and LKS PEMHEX self-clinching fasteners (with MD finish) is equivalent to applicable NASM25027 specifications. The self-clinching feature is the same tried and proven designmore
All metal, locking thread nuts – LK, LKA, LKS - Metric
PEMFLEX® Self-locking, Self-clinching Fasteners 2
Unit of Measure
1 

Part #

Thread Size x Pitch

A (Shank) Max.

Hole Size in Sheet + 0.08

C Max.

E Nom.

Fastener Material

Standard Finish

CAD

LK-M2.5-1MD N/A M2.5 x 0.45 N/A 0.97 mm N/A 4.37 mm N/A 4.35 mm N/A 6.35 mm N/A Carbon Steel N/A Black, Dry-film Lubricant over Zinc Phosphate N/A CAD Icon (for items table)
LK-M2.5-2MD N/A M2.5 x 0.45 N/A 1.38 mm N/A 4.37 mm N/A 4.35 mm N/A 6.35 mm N/A Carbon Steel N/A Black, Dry-film Lubricant over Zinc Phosphate N/A CAD Icon (for items table)
LK-M3-1MD N/A M3 x 0.5 N/A 0.97 mm N/A 4.75 mm N/A 4.73 mm N/A 6.35 mm N/A Carbon Steel N/A Black, Dry-film Lubricant over Zinc Phosphate N/A CAD Icon (for items table)
LK-M3-2MD N/A M3 x 0.5 N/A 1.38 mm N/A 4.75 mm N/A 4.73 mm N/A 6.35 mm N/A Carbon Steel N/A Black, Dry-film Lubricant over Zinc Phosphate N/A CAD Icon (for items table)
LK-M4-1MD N/A M4 x 0.7 N/A 0.97 mm N/A 6.76 mm N/A 6.73 mm N/A 8.73 mm N/A Carbon Steel N/A Black, Dry-film Lubricant over Zinc Phosphate N/A CAD Icon (for items table)
LK-M4-2MD N/A M4 x 0.7 N/A 1.38 mm N/A 6.76 mm N/A 6.73 mm N/A 8.73 mm N/A Carbon Steel N/A Black, Dry-film Lubricant over Zinc Phosphate N/A CAD Icon (for items table)
LK-M5-1MD N/A M5 x 0.8 N/A 0.97 mm N/A 7.92 mm N/A 7.9 mm N/A 9.53 mm N/A Carbon Steel N/A Black, Dry-film Lubricant over Zinc Phosphate N/A CAD Icon (for items table)
LK-M5-2MD N/A M5 x 0.8 N/A 1.38 mm N/A 7.92 mm N/A 7.9 mm N/A 9.53 mm N/A Carbon Steel N/A Black, Dry-film Lubricant over Zinc Phosphate N/A CAD Icon (for items table)
LKS-M2.5-1MD N/A M2.5 x 0.45 N/A 0.97 mm N/A 4.37 mm N/A 4.35 mm N/A 6.35 mm N/A 300 Series Stainless Steel N/A Black, Dry-film Lubricant N/A CAD Icon (for items table)
LKS-M2.5-2MD N/A M2.5 x 0.45 N/A 1.38 mm N/A 4.37 mm N/A 4.35 mm N/A 6.35 mm N/A 300 Series Stainless Steel N/A Black, Dry-film Lubricant N/A CAD Icon (for items table)
LKS-M3-1MD N/A M3 x 0.5 N/A 0.97 mm N/A 4.75 mm N/A 4.73 mm N/A 6.35 mm N/A 300 Series Stainless Steel N/A Black, Dry-film Lubricant N/A CAD Icon (for items table)
LKS-M3-2MD N/A M3 x 0.5 N/A 1.38 mm N/A 4.75 mm N/A 4.73 mm N/A 6.35 mm N/A 300 Series Stainless Steel N/A Black, Dry-film Lubricant N/A CAD Icon (for items table)
LKS-M4-1MD N/A M4 x 0.7 N/A 0.97 mm N/A 6.76 mm N/A 6.73 mm N/A 8.73 mm N/A 300 Series Stainless Steel N/A Black, Dry-film Lubricant N/A CAD Icon (for items table)
LKS-M4-2MD N/A M4 x 0.7 N/A 1.38 mm N/A 6.76 mm N/A 6.73 mm N/A 8.73 mm N/A 300 Series Stainless Steel N/A Black, Dry-film Lubricant N/A CAD Icon (for items table)
LKS-M5-1MD N/A M5 x 0.8 N/A 0.97 mm N/A 7.92 mm N/A 7.9 mm N/A 9.53 mm N/A 300 Series Stainless Steel N/A Black, Dry-film Lubricant N/A CAD Icon (for items table)
LKS-M5-2MD N/A M5 x 0.8 N/A 1.38 mm N/A 7.92 mm N/A 7.9 mm N/A 9.53 mm N/A 300 Series Stainless Steel N/A Black, Dry-film Lubricant N/A CAD Icon (for items table)
LKA-M2.5-1 N/A M2.5 x 0.45 N/A 0.97 mm N/A 4.37 mm N/A 4.35 mm N/A 6.35 mm N/A 7075-T6 Aluminum N/A Plain N/A CAD Icon (for items table)
LKA-M2.5-2 N/A M2.5 x 0.45 N/A 1.38 mm N/A 4.37 mm N/A 4.35 mm N/A 6.35 mm N/A 7075-T6 Aluminum N/A Plain N/A CAD Icon (for items table)
LKA-M3-1 N/A M3 x 0.5 N/A 0.97 mm N/A 4.75 mm N/A 4.73 mm N/A 6.35 mm N/A 7075-T6 Aluminum N/A Plain N/A CAD Icon (for items table)
LKA-M3-2 N/A M3 x 0.5 N/A 1.38 mm N/A 4.75 mm N/A 4.73 mm N/A 6.35 mm N/A 7075-T6 Aluminum N/A Plain N/A CAD Icon (for items table)
LKA-M4-1 N/A M4 x 0.7 N/A 0.97 mm N/A 6.76 mm N/A 6.73 mm N/A 8.73 mm N/A 7075-T6 Aluminum N/A Plain N/A CAD Icon (for items table)
LKA-M4-2 N/A M4 x 0.7 N/A 1.38 mm N/A 6.76 mm N/A 6.73 mm N/A 8.73 mm N/A 7075-T6 Aluminum N/A Plain N/A CAD Icon (for items table)
LKA-M5-1 N/A M5 x 0.8 N/A 0.97 mm N/A 7.92 mm N/A 7.9 mm N/A 9.53 mm N/A 7075-T6 Aluminum N/A Plain N/A CAD Icon (for items table)
LKA-M5-2 N/A M5 x 0.8 N/A 1.38 mm N/A 7.92 mm N/A 7.9 mm N/A 9.53 mm N/A 7075-T6 Aluminum N/A Plain N/A CAD Icon (for items table)
Unit of Measure
1