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 Barb
Style
Boss D Insert Diameter P Pilot Diameter
B Hole Dia. ±0.025 T Hole Dia. ±0.025 W Wall Thickness Min.
M1 x 0.25 M1 2.90 2.90 Single 3.00 3.12 2.00 3.45 3.10
4.80 4.80 Double 2.72 2.92
M2 x 0.4 M2 2.90 2.90 Single 3.00 3.12 2.00 3.45 3.10
4.80 4.80 Double 2.72 2.92
M2.5 x 0.45 M2.5 3.40 3.40 Single 3.88 4.04 2.40 4.37 3.98
5.60 5.60 Double 3.58 3.66
M3 x 0.5 M3 3.80 3.80 Single 5.05 5.23 3.00 5.59 5.15
6.40 6.40 Double 4.70 4.82
M3.5 x 0.6 M3.5 3.80 3.80 Single 5.05 5.23 3.00 5.59 5.15
6.40 6.40 Double 4.70 4.82
M4 x 0.7 M4 4.70 4.70 Single 5.74 5.94 3.40 6.35 5.84
7.90 7.90 Double 5.28 5.38
M5 x 0.8 M5 6.70 6.70 Single 7.69 8.00 4.40 8.33 7.82
11.10 11.10 Double 7.06 7.19
M6 x 1.0 M6 7.60 7.60 Single 8.86 9.22 4.90 9.53 8.99
12.70 12.70 Double 8.15 8.43
M8 x 1.25 M8 8.50 8.50 Single 10.95 11.38 6.20 11.90 11.15
14.30 14.30 Double 10.18 10.31
M10 x 1.5 M10 9.50 9.50 Single 13.28 13.71 7.50 14.30 13.46
15.90 15.90 Double 12.39 12.52

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.