LK-M2.5-2MD

PEMFLEX® Self-locking, Self-clinching Fasteners – Types LK, LKA, LKS

LK-M2.5-2MD

PEMFLEX® Self-locking, Self-clinching Fasteners – Types LK, LKA, LKS

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 design preferred and appreciated for fast, simple assembly. These fasteners do not protrude through the reverse side of the sheet and provide positive, permanent attachment with high torque-out (many times greater than locking torque) and pushout resistances.

PEM all-metal, self-locking fasteners are available in steel, stainless steel, and aluminum. Types LK (steel) and LKS (stainless) are treated with a black dry film lubricant for better locking performance. Type LKA (aluminum) must be used with a lubricated screw. The PEM design utilizes two rugged, semicircular flexing jaws instead of several less-supported segments. The greater ruggedness and retention of this PEMFLEX action prevents relaxation and loosening of the fastener in severe service.

This PEMFLEX design also protects the screw threads. Clearances obtained by only two interruptions of a full circumference, together with the spreading of the jaws by the entering screw, minimize the possibility of thread damage.

Specifications

Thread Size
M2.5 x 0.45
Thread Specification
6H, ANSI/ASME B1.13M, Internal
Fastener Material
Carbon Steel
Standard Finish
Black Dry Film Lubricant
For Use in Sheet Hardness
HRB 70 / HB 125 or Less
Anvil Depth_mm
5.5mm
Anvil Dia._mm
13mm
Product Category
PEMFLEX® Self-locking, Self-clinching Fasteners – Types LK, LKA, LKS
CAD Supplier
PennEngineering® (PEM®)
CADPartID
103695
Application Type
Automotive Electronics, Datacom, Electric Vehicle Chargers, Industrial, Telecom
Base Panel Material
Aluminum, Steel
Brand
PEM
Fastener Characteristics
Locking, Threaded Internal
Industry
Automotive Electronics, Datacom & Telecom, Industrial & Commercial, Medical
Installation Equipment/Method
C-Frame Automatic Feed, C-Frame Manual Feed
PEM Product Family
LN
Product Type
Nuts
Technology Type
Self-Clinching
Unit (Metric/Unified)
Metric
A Shank Max
1.38mm
Breaker Corner_mm
0.13mm
E Nom._mm
6.35mm
Hole Size in Sheet + 0.08_mm
4.37mm
Min. Dist. Hole C/L to Edge_mm
3.9mm
Min. Sheet Thickness_mm
1.4mm
C Max._mm
4.35mm
D Max._mm
4.45mm
Punch Dia._mm
13mm
T ± 0.25_mm
3.43mm

Resources

Installation & Performance Data

ln-lk-lks-lka-metric
TYPE THREAD CODE SHANK CODE TEST SHEET MATERIAL INSTALLATION (kN) PUSHOUT (N) TORQUE-OUT (N•m)
LK, LKS, LKA M2.5 1 5052-H34 Aluminum 7.1 578 2.3
LK, LKS, LKA M2.5 2 5052-H34 Aluminum 8.9 667 3.4
LK, LKS, LKA M2.5 1 Cold-Rolled Steel 13.3 667 2.3
LK, LKS, LKA M2.5 2 Cold-Rolled Steel 13.3 711 2.3

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