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
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	A ±.004 [long]	B ±.004 [short]	C ±.004	D ±.004	E +.002 -.000	F +.002 -.000	Min. Boss
0-80	080 x 115H	M1.6 x 0.35	M16 x 115H		.115	.123	.141	.123	.118	.246
0-80	080 x 188H	M1.6 x 0.35		.188		.112	.141	.123	.107	.246
2-56	256 x 115H	M2.0 x 0.4	M20 x 115H		.115	.123	.141	.123	.118	.246
2-56	256 x 188H	M2.0 x 0.4	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
5-40	540 x 250H	M3.0 x 0.5	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
6-32	632 x 250H	M3.5 x 0.6	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
		M5.0 x 0.8	M50 x 438H	.438		.283	.328	.315	.278	.630
1/4-20	2520 x 300H				.300	.354	.375	.363	.349	.726
1/4-20	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
1/4-28	2528 x 500H	M6.0 x 1.0	M60 x 500H	.500		.332	.375	.363	.321	.726
5/16-18	3118 x 335H				.335	.439	.469	.448	.431	.896
5/16-18	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
5/16-24	3124 x 562H	M8.0 x 1.25	M80 x 562H	.562		.406	.469	.448	.401	.896
3/8-16	3816 x 375H				.375	.532	.563	.540	.523	1.080
3/8-16	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
3/8-24	3824 x 625H	M10.0 x 1.5	M100 x 625H	.625		.493	.563	.540	.488	1.080

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.

Tri-Star Industries, Inc.
101 Massirio Dr., Berlin, CT 06037 :: Tel 860-828-7570 :: Fax 860-828-7475 :: sales@tristar-inserts.com