HPZ | Hi-Productivity Zerts

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  • Simplified boss design improves productivity.
  • Excellent performance in a variety of materials.
  • Rapid self-aligning installation using heat or ultrasonic.
  • Available with both inch and metric threads.


Insert Thread Insert Thread Code L Insert Length Insert Length Code Boss A Head Thickness C Head Diameter
Hole Dia.
Hole Depth
Wall Thickness Min.
M2 x 0.4 M2 5.00 5.00 3.80 6.00 1.50 0.60 5.00
M3 x 0.5 M3 5.50 5.50 4.40 6.50 1.80 0.60 6.00
M3.5 x 0.6 M3.5 6.00 6.00 5.20 7.00 1.80 0.80 7.00
M4 x 0.7 M4 7.50 7.50 5.80 8.50 2.00 0.80 8.00
M5 x 0.8 M5 9.00 9.00 7.00 10.00 2.00 1.00 8.50
M6 x 1.0 M6 10.00 10.00 8.50 11.00 2.50 1.00 10.00
M8 x 1.25 M8 12.00 12.00 10.90 13.00 3.00 1.00 12.00


Material Code Material Description
BRS Brass
SS Stainless Steel

Boss Design Recommendation

The HPZ Hi-Productivity Zert is designed to be installed into a hole with a 8°inclusive taper for its entire length. 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 top of the hole. 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.


The inserts may be installed by pre-heating or ultrasonic vibration methods. When using heat, the insert should be hot enough to soften the plastic without melting it to avoid flash around the top. Ultrasonic vibration should be applied using low amplitude and the minimum amount of power necessary to satisfactorily soften the plastic. In both methods, avoid excessive pressure that would force an insert into a hole without allowing the plastic to properly soften and flow around the insert features.