MB Series: Molded-In Blind Threaded Inserts for Plastics

Molded-In Blind Threaded InsertOur 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.

Printable Catalog Page
Threaded Mold-In Blind Insert Line Diagram

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
2-56 256X156MB – – .156 .156 .142 030 4
256X219MB – .156 .219 .142 030 6
4-40 440X205MB M3.0 x 0.5 M30X205MB .188 .205 .171 .030 4
440X281MB – .188 .281 .171 .030 6
440X344MB M30X344MB .188 .344 .171 .030 8
6-32 632X250MB M3.5 x 0.6 – .219 .250 .202 .060 4
632X344MB – .219 .344 .202 .060 6
632X469MB – .219 .469 .202 .060 10
8-32 832X469MB M4.0 x 0.7 M40X469MB† .250 .469 .226 .060 10
– – .250 .226 .060
– – .250 .226 .060
10-24 1024X438MB M5.0 x 0.8 – .281 .438 .259 .060 6
1024X531MB – .281 .531 .259 .060 8
1024X750MB – .281 .750 .259 .060 12
10-32 1032X281MB M5.0 x 0.8 – .281 .281 .259 .060 4
1032X438MB – .281 .438 .259 .060 6
1032X531MB M50X531MB .281 .531 .259 .060 8
1/4-20 2520X531MB M6.0 x 1.0 M60X531MB .344 .531 .321 .090 6
2520X625MB† M60X625MB† .344 .625 .321 .090 8
1/4-28 – – – .344 .321 .090
2528X625MB† .344 .625 .321 .090 12
5/16-18 3118X719MB M8.0 x 1.25 – .438 .719 .404 .094 8
– – .438 .404 .094
5/16-24 3124X719MB† – – .438 .719 .404 .094 10
– .438 .404 .094
3/8-16 3816X812MB – – .500 .812 .466 .094 8
3816X890MB† .500 .890 .466 .094 9
3/8-24 – – – .500 .466 .094
– .500 .466 .094

† Non-Stocking Item – Minimum Order May Apply
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