TWZ | Twin Zerts

All Products / Inserts for Plastic / Inch Inserts for Plastic - Zerts / TWZ | Twin Zerts


Clear

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


Features

  • Self–aligning installation using heat.
  • Opposing helical knurls and knurled vanes provide superior pull–out and torque–out resistance.
  • Double–ended to assist automatic feeding by eliminating the need for orientation during installation.
  • Thin boss walls permit compact design.
  • Available in a wide variety of thread sizes, stud lengths and options.


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 DiameterP Pilot Diameter
B Hole Dia. +.004 -.000W Wall Thickness Min.
2-56256.125.051.137.123
4-40440.157.063.174.154
6-32632.189.071.205.185
8-32832.220.083.239.218
10-241024.252.102.269.249
10-321032.252.102.269.249
1/4-202520.315.130.333.312
1/4-282528.315.130.333.312
5/16-183118.378.177.394.374
5/16-243124.378.177.394.374
3/8-163716.469.236.485.465
3/8-243724.469.236.485.465
1/2-135013.630.315.643.622
1/2-205020.630.315.643.622

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

Insert Length
Insert ThreadL Insert LengthInsert Length Code
2-56.118118
.1552155
4-40.157157
.188188
.2242224
6-32.197197
.2792279
8-32.157157
.188188
.228288
.3192319
10-24 10-32.228228
.3732373
1/4-20 1/4-28.269269
.374374
.4982498
5/16-18 5/16-24.4982498
3/8-16 3/8-24.4982498
1/2-13 1/2-20.6262626

  1. All dimensions are in inches and reference unless toleranced.
  2. Preferred insert length.
  3. Custom insert lengths available by request.

Material

Material CodeMaterial Description
BRSBrass
SSStainless Steel

Boss Design Recommendation

The TWZ Twin Zert is designed to be installed into a straight molded hole with a 0.5° 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

Pre-heating is the recommended installation method. The insert should be hot enough to soften the plastic without melting it to avoid flash around the top. Avoid excessive pressure that would force an insert into a hole without allowing the plastic to properly soften and flow around the insert features.

Performance

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