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Quality threaded inserts, made in America
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Tri-Star Industries, Inc. H Series Tapered Threaded Inserts

H Series: Tapered Threaded Inserts for Plastics

H Series tapered threaded inserts for plastics outperform all competitive inserts for ultrasonic and thermal installation into thermoplastic or structural foam. Our customers confirm it.

We've eliminated the outward stress that occurs with other insert designs during the installation process. Our proprietary "knuckle knurl" ensures a more uniform flow of material into the diagonal knurls and undercuts, ensuring a complete fill, reducing installation time and increasing holding strengths. The tapered insert design makes alignment faster and more accurate, reducing installation time.

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 pages for Tri-Star's tapered threaded inserts for plastics (120k PDF).

Tapered Threaded Inserts for Plastics

tapered brass inserts
TAPERED THREADED INSERTS
INCH   METRIC   A
±.004
[long]
B
±.004
[short]
C
±.004
D
±.004
E
+.002
-.000
F
+.002
-.000
Min.
Boss
Thread
Size
Part
Number
Thread
Size
Part
Number
0-80 080 x 115H† M1.6 x 0.35 M16 x 115H†   .115 .123 .141 .129 .118 .246
080 x 188H†   .188   .112 .141 .123 .107 .246
2-56 256 x 115H M2.0 x 0.4 M20 x 115H   .115 .123 .141 .129 .118 .246
256 x 188H M20 x 188H .188   .112 .141 .123 .107 .246
4-40 440 x 135H M2.5 x 0.45 M25 x 135H   .135 .157 .172 .159 .153 .318
440 x 219H M25 x 219H .219   .146 .172 .159 .141 .318
440 x 285H† M25 x 285H† .285   .146 .172 .159 .141 .318
5-40 540 x 150H† M3.0 x 0.5 M30 x 150H   .150 .203 .219 .206 .199 .412
540 x 250H† M30 x 250H .250   .190 .219 .206 .185 .412
6-32 632 x 150H M3.5 x 0.6 M35 x 150H   .150 .203 .219 .206 .199 .412
632 x 250H M35 x 250H† .250   .190 .219 .206 .185 .412
8-32 832 x 185H M4.0 x 0.7 M40 x 185H   .185 .230 .250 .234 .226 .468
832 x 312H M40 x 312H .312   .213 .250 .234 .208 .468
832 x 375H M40 x 375H† .375   .213 .250 .234 .208 .468
10-24 1024 x 150H       .150 .267 .297 .277 .267 .554
1024 x 225H   .225 .272 .297 .277 .267 .554
1024 x 375H .375   .251 .297 .277 .246 .554
10-32 1032 x 150H       .150 .267 .297 .277 .267 .554
1032 x 225H   .225 .272 .297 .277 .267 .554
1032 x 375H .375   .251 .297 .277 .246 .554
    M5.0 x 0.8 M50 x 265H   .265 .308 .328 .315 .303 .630
M50 x 438H .438   .283 .328 .315 .278 .630
1/4-20 2520 x 300H       .300 .354 .375 .363 .349 .726
2520 x 500H .500   .332 .375 .363 .321 .726
1/4-28 2528 x 300H M6.0 x 1.0 M60 x 300H   .300 .354 .375 .363 .349 .726
2528 x 500H M60 x 500H .500   .332 .375 .363 .321 .726
5/16-18 3118 x 335H       .335 .439 .469 .448 .431 .896
3118 x 562H .562   .406 .469 .448 .401 .896
5/16-24 3124 x 335H† M8.0 x 1.25 M80 x 335H†   .335 .439 .469 .448 .431 .896
3124 x 562H M80 x 562H .562   .406 .469 .448 .401 .896
3/8-16 3816 x 375H       .375 .532 .563 .540 .523 1.080
3816 x 625H .625   .493 .563 .540 .488 1.080
3/8-24 3824 x 375H† M10.0 x 1.5 M100 x 375H†   .375 .532 .563 .540 .523 1.080
3824 x 625H† M100 x 625H† .625   .493 .563 .540 .488 1.080

† Non-Stocking Item – Minimum Order May Apply

Stainless Steel Inserts – Class 3A/4H screw must pass with finger torque, standard class go gage may stop on last thread. Part numbers for Stainless Steel Inserts are the same as listed in the chart, but ending with -SS.

Thread sizes of 0-80, 2-56, M1.6 and M2.0 in H Series Inserts have a single diamond knurl.

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