THZ | Tapered Hole Zerts

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Features

  • Designed to be used in an 8° tapered hole.
  • Rapid self–aligning installation using heat or ultrasonic.
  • Combination of knurls and vanes provide high pull–out and torque–out resistance.
  • Circular flange creates an attractive installation by preventing escape of plastic.
  • Available in a wide variety of thread sizes and lengths.

Dimensions

Insert Thread Insert Thread Code L Insert Length L Insert Length Code BarbStyle Boss D Insert Diameter P Pilot Diameter
B Hole Dia.±.001 T Hole Dia.±.001 W Wall Thickness Min.
0-80 080 .115 115 Single .118 .123 .080 .136 .122
.188 188 Double .107 .115
2-56 256 .115 115 Single .118 .123 .080 .136 .122
.188 188 Double .107 .115
4-40 440 .135 135 Single .153 .159 .093 .172 .157
.219 219 Double .141 .144
6-32 632 .150 150 Single .199 .206 .116 .220 .203
.250 250 Double .185 .190
8-32 832 .185 185 Single .226 .234 .133 .250 .230
.312 312 Double .208 .212
10-24 1024 .225 225 Single .267 .277 .159 .296 .272
.375 375 Double .246 .251
10-32 1032 .225 225 Single .267 .277 .159 .296 .272
.375 375 Double .246 .251
1/4-20 2520 .300 300 Single .349 .363 .194 .375 .354
.500 500 Double .321 .332
1/4-28 2528 .300 300 Single .349 .363 .194 .375 .354
.500 500 Double .321 .332
5/16-18 3118 .335 335 Single .431 .448 .245 .469 .439
.562 562 Double .401 .406
5/16-24 3124 .335 335 Single .431 .448 .245 .469 .439
.562 562 Double .401 .406
3/8-16 3716 .375 375 Single .523 .540 .293 .563 .530
.625 625 Double .488 .493
3/8-24 3724 .375 375 Single .523 .540 .293 .563 .530
.625 625 Double .488 .493

Material

Material Code Material Description
BRS Brass
SS Stainless Steel

Boss Design Recommendation

The THZ Tapered Hole Zert is designed to be installed into a molded hole with a 8° inclusive taper for approximately 1/3 to 2/3 of its length and straight for the remainder. 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

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.