MB Series: Molded-in Blind Threaded Inserts for Plastic

Our MB Series threaded insert is designed to be molded into the plastic component during the molding cycle. Typically, the insert is placed on a core pin in the mold during the molding cycle. The insert is designed with aggressive knurling and undercuts to resist rotational and tensile pull loads. The part has a closed bottom (blind thread) to eliminate plastic flow into the threads. Although our catalog insert is brass, this product can also be manufactured in stainless steel, steel and aluminum.

Click here to download the catalog page for Tri-Star's mold-in blind inserts for plastics (96k PDF).

Molded-in Blind Threaded Inserts for Plastic

Note: The manufacturing process may leave a small cut-off nib on the closed end.

MOLD-IN BLIND THREADED INSERTS
INCH		METRIC		A ±.005	B ±.004	C ±.004	D ±.005	Min. Full Thread
Thread Size	Part Number	Thread Size	Part Number	A ±.005	B ±.004	C ±.004	D ±.005	Min. Full Thread
2-56	–	–	–	.156
2-56	–	–	–	.156
4-40	440 x 205MB	M3.0 x 0.5	M30 x 205MB	.188	.205	.171	.030	4
	440 x 281MB		–	.188	.281	.171	.030	6
	440 x 344MB		M30 x 344MB	.188	.344	.171	.030	8
6-32	632 x 250MB	M3.5 x 0.6	–	.219	.250	.202	.060	4
	632 x 344MB		–	.219	.344	.202	.060	6
	632 x 469MB		–	.219	.469	.202	.060	10
8-32	832 x 469MB	M4.0 x 0.7	M40 x 469MB	.250	.469	.226	.060	10
	–		–	.250		.226	.060
	–		–	.250		.226	.060
10-24	1024 x 438MB	M5.0 x 0.8	–	.281	.438	.259	.060	6
	1024 x 531MB		–	.281	.531	.259	.060	8
	1024 x 750MB		–	.281	.750	.259	.060	12
10-32	1032 x 281MB	M5.0 x 0.8	–	.281	.281	.259	.060	4
	1032 x 438MB		–	.281	.438	.259	.060	6
	1032 x 531MB		–	.281	.531	.259	.060	8
1/4-20	2520 x 531MB	M6.0 x 1.0	M60 x 531MB	.344	.531	.321	.090	6
1/4-20	–	M6.0 x 1.0	–	.344		.321	.090
1/4-28	–	–	–	.344		.321	.090
1/4-28	–	–	–	.344		.321	.090
5/16-18	3118 x 719MB	M8.0 x 1.25	–	.438	.719	.404	.094	8
5/16-18	–	M8.0 x 1.25	–	.438		.404	.094
5/16-24	3124 x 719MB†	–	–	.438	.719	.404	.094	10
5/16-24	–	–	–	.438		.404	.094
3/8-16	3816 x 812MB	–	–	.500	.812	.466	.094	8
3/8-16	3816 x 890MB†	–	–	.500	.890	.466	.094	9
3/8-24	–	–	–	.500		.466	.094
3/8-24	–	–	–	.500		.466	.094

† Non-Stocking Item – Minimum Order May Apply

Check availability of other items by calling 1-800-882-8980 x12, or email sales@tristarinserts.com.

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