The thread locking torque performance of Type PL and PLC PEMHEX® self-clinching fasteners is equivalent to applicable NASM25027 specifications. A nylon hexagonal element provides a reusable, non-metallic prevailing torque thread lock. The strong knurled collar receives the installation force and resists torque. The spin resistance of the knurl greatly exceeds the torque that can be exerted by the self-locking feature. As the knurled collar is embedded in the sheet, the undercut cavity beneath the collar is filled with displaced sheet material, thereby captivating the fastener in the sheet.

The color blue for fastener locking elements is a registered trademark. Unified fasteners have a blue nylon locking element and metric fasteners have a black nylon locking element.
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Unit of Measure

Thread Size

 .112-40 (#4-40)

Thread Code

 440

A (Shank) Max.

 .060 in
Sheet Thickness1 .040 to .070 in

Hole Size in Sheet + .003 - .000

 .234 in

C Max.

 .233 in
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D Max.

 .215 in

E Max.

 .274 in

T Max.

 .130 in

Min. Dist. Hole C/L to Edge

 .170 in

Max. Hole in Attached Parts

 .132 in

Fastener Materials - Locking Element

 Blue Nylon
For Use in Sheet Hardness2 HRB 70 / HB 125 or Less

Thread Specification

 Internal, ANSI B1.1, 2B

Fastener Material

 Heat-Treated Carbon Steel

Optional Finish

 Zinc plated per ASTM B633, SC1 (5µm), Type II, yellow

CAD Supplier

 PennEngineering® (PEM®)
  • 1 - Can be used in panel thickness of .040” to .060” / 1 mm to 1.53 mm provided the fastener is not fully installed. The knurled collar must be left protruding above the sheet to the degree that the sheet thickness is less than .060” / 1.53 mm.

    - K
  • 2 HRB - Hardness Rockwell “B” Scale. HB - Hardness Brinell.