LSZS | Low Stress Studded 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.

Dimensions

General
Insert Thread Insert Thread Code L Insert Length Insert Length Code Boss A Head Thickness C Head Diameter D Insert Diameter P Pilot Diameter
B Hole Dia. +.004 -.000 W Minimum Wall Thickness
2-56 256 .155 155 .126 .055 .020 .187 .137 .123
4-40 440 .228 228 .157 .071 .023 .217 .174 .154
6-32 632 .281 281 .189 .083 .029 .250 .206 .185
8-32 832 .320 320 .220 .094 .035 .280 .239 .218
10-24 1024 .374 374 .252 .110 .042 .312 .270 .249
10-32 1032 .374 374 .252 .110 .042 .312 .270 .249
1/4-20 2520 .500 500 .315 .142 .052 .375 .333 .312
1/4-28 2528 .500 500 .315 .142 .052 .375 .333 .312
5/16-18 3118 .500 500 .378 .197 .052 .437 .393 .375
5/16-24 3124 .500 500 .378 .197 .052 .437 .393 .375
Stud Length
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 .137 187 250 312
4-40 440 .174 187 250 312 375 437
6-32 632 .206 187 250 312 375 437 500
8-32 832 .239 187 250 312 375 437 500 625
10-24 1024 .270 187 250 312 375 437 500 625 750
10-32 1032 .270 187 250 312 375 437 500 625 750
1/4-20 2520 .333 250 312 375 437 500 625 750 875 1000
1/4-28 2528 .333 250 312 375 437 500 625 750 875 1000
5/16-18 3118 .393 312 375 437 500 625 750 875 1000
5/16-24 3124 .393 312 375 437 500 625 750 875 1000

Material

Material Code Material Description
BRS Brass
SS Stainless 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.