EFZ | Expansion Fin Zerts

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Featured

  • Simple press–in installation for most thermoplastics.
  • Mating screw resistant to loosening after installation.
  • High pull–out and torque–out resistance.


When second sourcing PENCOM’s products, PENCOM recommends that the part is tested in the application to ensure that it will meet all performance requirements.

Dimensions

General
Insert ThreadInsert Thread CodeBossD Insert Diameter
B Hole Dia. +.004 -.000W Wall Thickness Min.
2-56256.126.063.146
4-40440.157.079.177
6-32632.189.094.209
8-32832.220.110.242
10-241024.252.126.272
10-321032.252.126.272
1/4-202520.315.157.335
1/4-282528.315.157.335
5/16-183118.378.189.398
5/16-243124.378.189.398
Stud Length
Insert ThreadL Insert LengthInsert Length Code
2-56.1572157
4-40.157157
4-40.2282228
6-32.157157
6-32.2832283
8-32.228228
8-32.3232323
10-24 10-32.228228
10-24 10-32.322322
10-24 10-32.3742374
1/4-20 1/4-28.283283
1/4-20 1/4-28.374374
1/4-20 1/4-28.5002500
5/16-18 5/16-24.5002500

Boss Design Recommendation

The EFZ Expansion Fin Zert is designed to be installed into a straight hole with a 1° inclusive taper. The top of the hole should not be countersunk or counterbored as this will decrease the insert’s performance. The recommended hole size applies at the point reached by the bottom of the insert. Molded holes should be used wherever possible as drilled holes may result in diminished performance. Minimum boss wall thicknesses shown are for reference and may vary depending on the type of plastic.

Installation

Press the insert into the boss using a squeezing action – never a hammer blow. Ensure that the insert maintains axial alignment during installation to prevent tilting which will induce side loads on the boss. Oversize boss holes weaken the insert’s self-aligning characteristics causing side loads which may lead to possible boss cracking. Install fixing screw from the knurled end with sufficient length to fully penetrate the insert and achieve maximum fin expansion prior to applying full clamping load.

Performance

Material & Finish

Material CodeMaterial DescriptionFinish CodeFinish Description

Contact a PENCOM Account Representative for other material & finish options.