LSZ | Low Stress Zerts

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Features

  • Rounded knurl pattern reduces stress in notch sensitive amorphous thermoplastics.
  • Rapid self–aligning installation using heat.
  • Double–ended to assist automatic feeding by eliminating the need for orientation during installation.
  • Knurl pattern provides high torque–out resistance.
  • 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

Insert ThreadInsert Thread CodeL Insert LengthInsert Length CodeBossA Head ThicknessC Head DiameterD Insert DiameterP Pilot Diameter
B Hole Dia. +0.10 -0.00W Minimum Wall Thickness
M2 x 0.4M23.903.903.201.400.514.803.503.10
M2.5 x 0.45M2.55.805.804.001.800.585.504.403.90
M3 x 0.5M35.805.804.001.800.585.504.403.90
M3.5 x 0.6M3.57.107.104.802.100.746.405.204.70
M4 x 0.7M48.108.105.602.400.897.106.105.50
M5 x 0.8M59.509.506.402.801.077.906.906.30
M6 x 1.0M612.7012.708.003.601.329.508.507.90
M8 x 1.25M812.7012.709.605.001.3211.1010.009.50

Material

Material CodeMaterial Description
BRSBrass
SSStainless Steel

Boss Design Recommendation

The LSZ Low Stress Zert is designed to be installed into a straight 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 reference only. Variations in application, boss material type and size, and installation method will affect the loads. PENCOM strongly encourages testing in the application.