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.

Dimensions

General
Insert Thread Insert Thread Code Boss D Insert Diameter
B Hole Dia. +.004 -.000 W Wall Thickness Min.
2-56 256 .126 .063 .146
4-40 440 .157 .079 .177
6-32 632 .189 .094 .209
8-32 832 .220 .110 .242
10-24 1024 .252 .126 .272
10-32 1032 .252 .126 .272
1/4-20 2520 .315 .157 .335
1/4-28 2528 .315 .157 .335
5/16-18 3118 .378 .189 .398
5/16-24 3124 .378 .189 .398
Stud Length
Insert Thread L Insert Length Insert Length Code
2-56 .1572 157
4-40 .157 157
4-40 .2282 228
6-32 .157 157
6-32 .2832 283
8-32 .228 228
8-32 .3232 323
10-24 10-32 .228 228
10-24 10-32 .322 322
10-24 10-32 .3742 374
1/4-20 1/4-28 .283 283
1/4-20 1/4-28 .374 374
1/4-20 1/4-28 .5002 500
5/16-18 5/16-24 .5002 500

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


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Material CodeMaterial DescriptionFinish CodeFinish Description

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