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PEMSERT® Self-clinching Flush Fasteners.
Installs flush into stainless steel sheets

Type F4™ fasteners are ideal for flush applications where a stainless steel sheet requires loadbearingthreads. The PEM® flush nut can be installed easily by squeezing it into a round holein metal sheets. When the fastener is properly installed, both the top and the bottom of thesheet remain flat, enhancing the functional and cosmetic qualities of the entire assembly.The hexagonal head along with the proven PEM self-clinching design ensures high axial andtorsional strength.
Unit of Measure

Thread Size

 N/A .250-20 (1/4-20)

Thread Code

 N/A 0420
Shank Code1 N/A 4

A (Shank) Max.

 N/A .151 in

Sheet Thickness

 N/A .156 to .187 in

Hole Size in Sheet + .003 - .000

 N/A .344 in

C Max.

 N/A .343 in a1386_1.jpg

H Nom.

 N/A .375 in
Min. Dist. Hole C/L to Edge2 N/A .34 in
For Use in Sheet Hardness3 N/A HRB 88 / HB 183 or Less

Thread Specification

 N/A Internal, ASME B1.1, 2B

Fastener Material

 N/A Heat treated 400 Series Stainless Steel

Standard Finish

 N/A Passivated and/or tested per ASTM A380

CAD Supplier

 N/A PennEngineering® (PEM®)
  • 1 Other shank and screw lengths available.
  • 2 To minimize sheet distortion and maximize product performance, use a centerline-to-edge value greater or equal to the value specified.
  • 3 HRB - Hardness Rockwell “B” Scale. HB - Hardness Brinell.