Press-in (Free-running) Inserts

PFZS – Press–in Fin Studded Zerts

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Features

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

General

Inch

Insert Thread Insert Thread Code L Insert Length Insert Length Code Boss A Head Thickness C Head Diameter D Insert Diameter P Pilot Diameter Number of Fins
B Hole Dia. +.004 -.000 W Wall Thickness Min.
2-56 256 .157 157 .126 .063 .018 .189 .147 .123 2
4-40 440 .187 187 .157 .079 .023 .217 .178 .154 3
6-32 632 .250 250 .189 .094 .029 .250 .209 .185 4
8-32 832 .312 312 .220 .110 .035 .281 .240 .218 5
10-24 1024 .375 375 .252 .126 .042 .312 .274 .248 5
10-32 1032 .375 375 .252 .126 .042 .312 .274 .248 5
1/4-20 2520 .500 500 .315 .157 .052 .375 .337 .310 7
1/4-28 2528 .500 500 .315 .157 .052 .375 .337 .310 7
5/16-18 3118 .500 500 .378 .189 .052 .433 .400 .375 7
5/16-24 3124 .500 500 .378 .189 .052 .433 .400 .375 7

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

Metric

Insert Thread Insert Thread Code L Insert Length Insert Length Code Boss A Head Thickness C Head Diameter D Insert Diameter P Pilot Diameter Number of Fins
B Hole Dia. +0.10 -0.00 W Wall Thickness Min.
M2 x 0.4 M2 4.00 4.00 3.20 1.60 0.45 4.80 3.73 3.10 2
M2.5 x 0.45 M2.5 4.80 4.80 4.00 2.00 0.58 5.50 4.52 3.90 3
M3 x 0.5 M3 4.80 4.80 4.00 2.00 0.58 5.50 4.52 3.90 3
M3.5 x 0.6 M3.5 6.40 6.40 4.80 2.40 0.74 6.40 5.31 4.70 4
M4 x 0.7 M4 7.90 7.90 5.60 2.80 0.89 7.10 6.10 5.50 5
M5 x 0.8 M5 9.50 9.50 6.40 3.20 1.07 7.90 6.96 6.30 5
M6 x 1.0 M6 12.70 12.70 8.00 4.00 1.32 9.50 8.56 7.90 7
M8 x 1.25 M8 12.70 12.70 9.60 4.80 1.32 11.10 10.16 9.50 7

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

Stud Length

Inch

Stud Thread Stud Thread Code D Insert Diameter S – Stud Length
.187 .250 .312 .375 .437 .500 .625 .750 .875 1.000
Stud Length Code
2-56 256 .147 187 250 312
4-40 440 .178 187 250 312 375 437
6-32 632 .209 187 250 312 375 437 500
8-32 832 .240 187 250 312 375 437 500 625
10-24 1024 .274 187 250 312 375 437 500 625 750
10-32 1032 .274 187 250 312 375 437 500 625 750
1/4-20 2520 .337 250 312 375 437 500 625 750 875 1000
1/4-28 2528 .337 250 312 375 437 500 625 750 875 1000
5/16-18 3118 .400 312 375 437 500 625 750 875 1000
5/16-24 3124 .400 312 375 437 500 625 750 875 1000

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

Metric

Stud Thread Stud Thread Code D Insert Diameter S – Stud Length
5.00 6.00 8.00 10.00 12.00 14.00 16.00 18.00 20.00 25.00
Stud Length Code
M2 x 0.4 M2 3.73 5.00 6.00 8.00
M2.5 x 0.45 M2.5 4.52 5.00 6.00 8.00 10.00
M3 x 0.5 M3 4.52 5.00 6.00 8.00 10.00 12.00
M3.5 x 0.6 M3.5 5.31 5.00 6.00 8.00 10.00 12.00 14.00
M4 x 0.7 M4 6.10 5.00 6.00 8.00 10.00 12.00 14.00 16.00
M5 x 0.8 M5 6.96 5.00 6.00 8.00 10.00 12.00 14.00 16.00 18.00 20.00
M6 x 1.0 M6 8.56 6.00 8.00 10.00 12.00 14.00 16.00 18.00 20.00 25.00
M8 x 1.25 M8 10.16 8.00 10.00 12.00 14.00 16.00 18.00 20.00 25.00

(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 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.

pfz-design

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.

Performance

pfz-performance
(1) Performance data shown is for reference only. Variations in application, boss material type and size, and installation method will affect the loads. PENCOM strongly encourages testing in the application.