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Tri-Star Industries, Inc. E & HE Series Expansion Inserts

E & HE Series: Threaded Expansion Inserts for Plastics

Our E & HE Series threaded expansion inserts are designed to provide strong reusable threads in thermoset and other hard plastics. Expansion inserts are pressed into the plastic and expand when the assembly screw is tightened. The sharp diamond knurling provides resistance to tensile and torque loads. The mating screw should be designed for full thread engagement. This will allow the insert to fully expand. For best results, the boss diameters should be approximately 2-1/2 times the recommended hole size. In "through-hole" applications, the HE Series flange adds greater strength for tensile pull loads. Inserts are available with or without a flange.

Recommended Hole Size – See chart below for installation hole size. Additional information can be found in our Design Guidelines.

Click here to download the catalog page for Tri-Star's threaded expansion inserts for plastics (180k PDF).

Threaded Expansion Inserts for Plastics

brass expansion inserts
E SERIES THREADED EXPANSION INSERTS
INCH   METRIC   A
±.005
B
±.005
Hole Size
+.003
-.000
Thread
Size
Part
Number
Thread
Size
Part
Number
2-56 256 x 157E M2.0 x 0.4 M20 x 157E .136 .157 .126
4-40 440 x 188E M3.0 x 0.5 M30 x 188E .165 .189 .157
6-32 632 x 250E M3.5 x 0.6 M35 x 250E† .197 .252 .185
8-32 832 x 312E M4.0 x 0.7 M40 x 312E .230 .315 .217
10-24 1024 x 375E M5.0 x 0.8 M50 x 375E .260 .374 .248
10-32 1032 x 375E     .260 .374 .248
1/4-20 2520 x 500E M6.0 x 1.0 M60 x 500E .327 .500 .311
5/16-18 3118 x 500E M8.0 x 1.25 M80 x 500E† .390 .500 .374
HE SERIES THREADED EXPANSION INSERTS
INCH   METRIC   A
±.005
B
±.005
C
±.005
D
±.005
Hole Size
+.003
-.000
Thread
Size
Part
Number
Thread
Size
Part
Number
2-56 H256 x 157E M2.0 x 0.4 HM20 x 157E .189 .136 .024 .157 .126
4-40 H440 x 188E M3.0 x 0.5 HM30 x 188E .220 .165 .024 .189 .157
6-32 H632 x 250E M3.5 x 0.6 HM35 x 250E† .252 .197 .031 .252 .185
8-32 H832 x 312E M4.0 x 0.7 HM40 x 312E .283 .230 .031 .315 .217
10-24 H1024 x 375E M5.0 x 0.8 HM50 x 375E .315 .260 .039 .374 .248
10-32 H1032 x 375E     .315 .260 .039 .374 .248
1/4-20 H2520 x 500E M6.0 x 1.0 HM60 x 500E .374 .327 .051 .500 .311
5/16-18 H3118 x 500E M8.0 x 1.25 HM80 x 500E† .433 .390 .051 .500 .374

† Non-Stocking Item – Minimum Order May Apply

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