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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
PEMFLEX®  Self-locking, Self-clinching Fasteners 2
Unit of Measure
1 2 

Part #

Thread Size

A (Shank) Max.

Hole Size in Sheet + .003 - .000

C Max.

E Nom.

Fastener Material

Standard Finish

CAD

LK-256-1MD N/A .086-56 (#2-56) N/A 0.038 in N/A .172 in N/A .171 in N/A .250 in N/A Carbon Steel N/A Black, Dry-film Lubricant over Zinc Phosphate N/A CAD Icon (for items table)
LK-256-2MD N/A .086-56 (#2-56) N/A .054 in N/A .172 in N/A .171 in N/A .250 in N/A Carbon Steel N/A Black, Dry-film Lubricant over Zinc Phosphate N/A CAD Icon (for items table)
LK-440-1MD N/A .112-40 (#4-40) N/A 0.038 in N/A .187 in N/A .186 in N/A .250 in N/A Carbon Steel N/A Black, Dry-film Lubricant over Zinc Phosphate N/A CAD Icon (for items table)
LK-440-2MD N/A .112-40 (#4-40) N/A .054 in N/A .187 in N/A .186 in N/A .250 in N/A Carbon Steel N/A Black, Dry-film Lubricant over Zinc Phosphate N/A CAD Icon (for items table)
LK-632-1MD N/A .138-32 (#6-32) N/A 0.038 in N/A .219 in N/A .218 in N/A .312 in N/A Carbon Steel N/A Black, Dry-film Lubricant over Zinc Phosphate N/A CAD Icon (for items table)
LK-632-2MD N/A .138-32 (#6-32) N/A .054 in N/A .219 in N/A .218 in N/A .312 in N/A Carbon Steel N/A Black, Dry-film Lubricant over Zinc Phosphate N/A CAD Icon (for items table)
LK-832-1MD N/A .164-32 (#8-32) N/A 0.038 in N/A .266 in N/A .265 in N/A .343 in N/A Carbon Steel N/A Black, Dry-film Lubricant over Zinc Phosphate N/A CAD Icon (for items table)
LK-832-2MD N/A .164-32 (#8-32) N/A .054 in N/A .266 in N/A .265 in N/A .343 in N/A Carbon Steel N/A Black, Dry-film Lubricant over Zinc Phosphate N/A CAD Icon (for items table)
LK-032-1MD N/A .190-32 (#10-32) N/A 0.038 in N/A .312 in N/A .311 in N/A .375 in N/A Carbon Steel N/A Black, Dry-film Lubricant over Zinc Phosphate N/A CAD Icon (for items table)
LK-032-2MD N/A .190-32 (#10-32) N/A .054 in N/A .312 in N/A .311 in N/A .375 in N/A Carbon Steel N/A Black, Dry-film Lubricant over Zinc Phosphate N/A CAD Icon (for items table)
LKS-256-1MD N/A .086-56 (#2-56) N/A 0.038 in N/A .172 in N/A .171 in N/A .250 in N/A 300 Series Stainless Steel N/A Black, Dry-film Lubricant N/A CAD Icon (for items table)
LKS-256-2MD N/A .086-56 (#2-56) N/A .054 in N/A .172 in N/A .171 in N/A .250 in N/A 300 Series Stainless Steel N/A Black, Dry-film Lubricant N/A CAD Icon (for items table)
LKS-440-1MD N/A .112-40 (#4-40) N/A 0.038 in N/A .187 in N/A .186 in N/A .250 in N/A 300 Series Stainless Steel N/A Black, Dry-film Lubricant N/A CAD Icon (for items table)
LKS-440-2MD N/A .112-40 (#4-40) N/A .054 in N/A .187 in N/A .186 in N/A .250 in N/A 300 Series Stainless Steel N/A Black, Dry-film Lubricant N/A CAD Icon (for items table)
LKS-632-1MD N/A .138-32 (#6-32) N/A 0.038 in N/A .219 in N/A .218 in N/A .312 in N/A 300 Series Stainless Steel N/A Black, Dry-film Lubricant N/A CAD Icon (for items table)
LKS-632-2MD N/A .138-32 (#6-32) N/A .054 in N/A .219 in N/A .218 in N/A .312 in N/A 300 Series Stainless Steel N/A Black, Dry-film Lubricant N/A CAD Icon (for items table)
LKS-832-1MD N/A .164-32 (#8-32) N/A 0.038 in N/A .266 in N/A .265 in N/A .343 in N/A 300 Series Stainless Steel N/A Black, Dry-film Lubricant N/A CAD Icon (for items table)
LKS-832-2MD N/A .164-32 (#8-32) N/A .054 in N/A .266 in N/A .265 in N/A .343 in N/A 300 Series Stainless Steel N/A Black, Dry-film Lubricant N/A CAD Icon (for items table)
LKS-032-1MD N/A .190-32 (#10-32) N/A 0.038 in N/A .312 in N/A .311 in N/A .375 in N/A 300 Series Stainless Steel N/A Black, Dry-film Lubricant N/A CAD Icon (for items table)
LKS-032-2MD N/A .190-32 (#10-32) N/A .054 in N/A .312 in N/A .311 in N/A .375 in N/A 300 Series Stainless Steel N/A Black, Dry-film Lubricant N/A CAD Icon (for items table)
LKA-256-1 N/A .086-56 (#2-56) N/A 0.038 in N/A .172 in N/A .171 in N/A .250 in N/A 7075-T6 Aluminum N/A Plain N/A CAD Icon (for items table)
LKA-256-2 N/A .086-56 (#2-56) N/A .054 in N/A .172 in N/A .171 in N/A .250 in N/A 7075-T6 Aluminum N/A Plain N/A CAD Icon (for items table)
LKA-440-1 N/A .112-40 (#4-40) N/A 0.038 in N/A .187 in N/A .186 in N/A .250 in N/A 7075-T6 Aluminum N/A Plain N/A CAD Icon (for items table)
LKA-440-2 N/A .112-40 (#4-40) N/A .054 in N/A .187 in N/A .186 in N/A .250 in N/A 7075-T6 Aluminum N/A Plain N/A CAD Icon (for items table)
LKA-632-1 N/A .138-32 (#6-32) N/A 0.038 in N/A .219 in N/A .218 in N/A .312 in N/A 7075-T6 Aluminum N/A Plain N/A CAD Icon (for items table)
Unit of Measure
1 2