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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
Items All metal, locking thread nuts –  LK, LKA, LKS
LK-256-1MD
PEMFLEX® Self-locking, Self-clinching Fasteners - Types LK, LKA, LKS - Unified
All metal, locking thread nuts –  LK, LKA, LKS
LK-256-2MD
PEMFLEX® Self-locking, Self-clinching Fasteners - Types LK, LKA, LKS - Unified
All metal, locking thread nuts –  LK, LKA, LKS
LK-440-1MD
PEMFLEX® Self-locking, Self-clinching Fasteners - Types LK, LKA, LKS - Unified
All metal, locking thread nuts –  LK, LKA, LKS
LK-440-2MD
PEMFLEX® Self-locking, Self-clinching Fasteners - Types LK, LKA, LKS - Unified
All metal, locking thread nuts –  LK, LKA, LKS
LK-632-1MD
PEMFLEX® Self-locking, Self-clinching Fasteners - Types LK, LKA, LKS - Unified
Thread Size N/A .086-56 (#2-56) N/A .086-56 (#2-56) N/A .112-40 (#4-40) N/A .112-40 (#4-40) N/A .138-32 (#6-32)
A (Shank) Max. N/A 0.038 in a1093_1.jpg N/A .054 in a1093_1.jpg N/A 0.038 in a1093_1.jpg N/A .054 in a1093_1.jpg N/A 0.038 in a1093_1.jpg
Min. Sheet Thickness N/A .040 in N/A .056 in N/A .040 in N/A .056 in N/A .040 in
Hole Size in Sheet + .003 - .000 N/A .172 in N/A .172 in N/A .187 in N/A .187 in N/A .219 in
C Max. N/A .171 in N/A .171 in N/A .186 in N/A .186 in N/A .218 in
D Max. N/A .165 in N/A .165 in N/A .185 in N/A .185 in N/A .220 in
E Nom. N/A .250 in N/A .250 in N/A .250 in N/A .250 in N/A .312 in
T ± .010 N/A .135 in N/A .135 in N/A .135 in N/A .135 in N/A .145 in
Min. Dist. Hole C/L to Edge1 N/A .156 in N/A .156 in N/A .156 in N/A .156 in N/A .187 in
Thread Specification N/A Internal, ANSI B1.1, 3B
Fastener Material N/A Carbon Steel
Standard Finish N/A Black, Dry-film Lubricant over Zinc Phosphate
Anvil Dia. N/A .500 in
Anvil Depth N/A .218 in
Breaker Corner N/A .005 in
Punch Dia. N/A .500 in
CAD Supplier N/A PennEngineering® (PEM®)
Inventory
  • 1 To minimize sheet distortion and maximize product performance, use a centerline-to-edge value greater or equal to the value specified.