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Self-Locking Self-Clinching Fasteners (Unified)

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The PEMFLEX® design provides MIL- IM-25027 locking performance without damaging mating threads. Thread sizes #2 to #10 and M2.5 to M5.

PEM® self-locking fasteners (Type LK/LKS/LKA) permanently retain their inherent flexing action, permitting repeated use and effective prevailing locking torque.
  • The unique PEMFLEX® self-locking feature with EF or MD finishes, meet the locking torque requirements for 250°F nuts of NASM25027 specification. 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.
  • Screws for use with PEM self-locking fasteners should be Class 3A fit or no smaller than Class 2A (metric-Class 4h fit or no smaller than Class 6g) and long enough so that at least two threads project through PEMFLEX fasteners when tightened.
Quantity Discount Available.
Request Quote for orders less than 1000 or 5000, depending on fastener type.






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  Results 1 - 25 of 50 1 2 

Item #

Type

Thread Size

Fastener Material

A (Shank) Max.

Min. Sheet Thickness

Hole Size in Sheet (+0.003 / -0.000)

Inventory

LK-256-1MD LK (#2-56)
0.086-56
Carbon Steel 0.038 in. 0.040 in. 0.172 in. {}
LK-256-1EF LK (#2-56)
0.086-56
Carbon Steel 0.038 in. 0.040 in. 0.172 in. {}
LK-256-2MD LK (#2-56)
0.086-56
Carbon Steel 0.054 in. 0.056 in. 0.172 in. {}
LK-256-2EF LK (#2-56)
0.086-56
Carbon Steel 0.054 in. 0.056 in. 0.172 in. {}
LK-440-1MD LK (#4-40)
0.112-40
Carbon Steel 0.038 in. 0.040 in. 0.187 in. {}
LK-440-1EF LK (#4-40)
0.112-40
Carbon Steel 0.038 in. 0.040 in. 0.187 in. {}
LK-440-2MD LK (#4-40)
0.112-40
Carbon Steel 0.054 in. 0.056 in. 0.187 in. {}
LK-440-2EF LK (#4-40)
0.112-40
Carbon Steel 0.054 in. 0.056 in. 0.187 in. {}
LK-632-1MD LK (#6-32)
0.138-32
Carbon Steel 0.038 in. 0.040 in. 0.219 in. {}
LK-632-1EF LK (#6-32)
0.138-32
Carbon Steel 0.038 in. 0.040 in. 0.219 in. {}
LK-632-2MD LK (#6-32)
0.138-32
Carbon Steel 0.054 in. 0.056 in. 0.219 in. {}
LK-632-2EF LK (#6-32)
0.138-32
Carbon Steel 0.054 in. 0.056 in. 0.219 in. {}
LK-832-1MD LK (#8-32)
0.164-32
Carbon Steel 0.038 in. 0.040 in. 0.266 in. {}
LK-832-1EF LK (#8-32)
0.164-32
Carbon Steel 0.038 in. 0.040 in. 0.266 in. {}
LK-832-2MD LK (#8-32)
0.164-32
Carbon Steel 0.054 in. 0.056 in. 0.266 in. {}
LK-832-2EF LK (#8-32)
0.164-32
Carbon Steel 0.054 in. 0.056 in. 0.266 in. {}
LK-032-1MD LK (#10-32)
0.190-32
Carbon Steel 0.038 in. 0.040 in. 0.312 in. {}
LK-032-1EF LK (#10-32)
0.190-32
Carbon Steel 0.038 in. 0.040 in. 0.312 in. {}
LK-032-2MD LK (#10-32)
0.190-32
Carbon Steel 0.054 in. 0.056 in. 0.312 in. {}
LK-032-2EF LK (#10-32)
0.190-32
Carbon Steel 0.054 in. 0.056 in. 0.312 in. {}
LKS-256-1MD LKS (#2-56)
0.086-56
Stainless Steel 0.038 in. 0.040 in. 0.172 in. {}
LKS-256-1EF LKS (#2-56)
0.086-56
Stainless Steel 0.038 in. 0.040 in. 0.172 in. {}
LKS-256-2MD LKS (#2-56)
0.086-56
Stainless Steel 0.054 in. 0.056 in. 0.172 in. {}
LKS-256-2EF LKS (#2-56)
0.086-56
Stainless Steel 0.054 in. 0.056 in. 0.172 in. {}
LKS-440-1MD LKS (#4-40)
0.112-40
Stainless Steel 0.038 in. 0.040 in. 0.187 in. {}
  Results 1 - 25 of 50 1 2