PFZS | Press-in Fin Zerts Studded

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Use the fields above to design your part and request a quote.


  • Simple press–in installation for most thermoplastics.
  • High pull–out resistance.
  • Self–aligning design.
  • Available in a wide variety of thread sizes stud lengths.

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.


Insert ThreadInsert Thread CodeL Insert LengthInsert Length CodeBossA Head ThicknessC Head DiameterD Insert DiameterP Pilot DiameterNumber of Fins
B Hole Dia. +0.10 -0.00W Wall Thickness Min.
M2 x 0.4M24.
M2.5 x 0.45M2.54.804.804.002.000.585.504.523.903
M3 x 0.5M34.804.804.002.000.585.504.523.903
M3.5 x 0.6M3.56.406.404.802.400.746.405.314.704
M4 x 0.7M47.907.905.602.800.897.106.105.505
M5 x 0.8M59.509.506.403.201.077.906.966.305
M6 x 1.0M612.7012.708.004.001.329.508.567.907
M8 x 1.25M812.7012.709.604.801.3211.1010.169.507

(1) All dimensions are in millimeters and reference unless toleranced.

Stud Length
Stud ThreadStud Thread CodeD Insert DiameterS – Stud Length
Stud Length Code
M2 x 0.4M23.735.006.008.00
M2.5 x 0.45M2.54.525.006.008.0010.00
M3 x 0.5M34.525.006.008.0010.0012.00
M3.5 x 0.6M3.55.315.006.008.0010.0012.0014.00
M4 x 0.7M46.
M5 x 0.8M56.965.006.008.0010.0012.0014.0016.0018.0020.00
M6 x 1.0M68.566.008.0010.0012.0014.0016.0018.0020.0025.00
M8 x 1.25M810.168.0010.0012.0014.0016.0018.0020.0025.00

(1) All dimensions are in millimeters and reference unless toleranced.
(2) Custom stud lengths available by request.

Boss Design Recommendation

The PFZ Press–in 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 counter bored 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.


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.


Material & Finish

Material CodeMaterial DescriptionFinish CodeFinish Description
SSStainless Steel

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