Specialinsert 841 B-Lok Brass Press-In Expanding Threaded Insert

Description

B-Lok brass insert is a press-in and expansion threaded insert for thermoset plastics that need strong, reliable internal threads.

B-Lok brass insert benefits

• Press-in plus expansion action gives high pull-out and torque resistance.
• External profile locks into rigid thermoset materials without cracking the laminate.
• Supports repeated assembly and disassembly with stable clamp load.
• Supplied in natural brass with good corrosion resistance and conductivity.

B-Lok brass insert applications

• Electrical enclosures, switchgear and molded control housings.
• Industrial equipment panels and covers that need serviceable threaded points.
• Appliance, lighting and energy systems built from thermoset resins.

Installation and performance

The B-Lok expansion geometry lets the insert press into a straight hole, then expand to grip the wall. Correct hole size and insertion force help the ribs bite cleanly into the thermoset and create a strong mechanical lock.

Expansion can occur during the press operation or with a dedicated tool. We recommend trials on sample parts to confirm hole diameter, expansion stroke and final pull-out and torque values before releasing a production process.

Sizing, materials and availability

B-Lok 841 inserts are produced in brass and supplied in their natural finish for general industrial use. Standard metric and UNC internal threads are available to match common fastener sizes.

For full technical data, drawings and installation guidance, visit the official press-in + expansion threaded insert 841 page on the Specialinsert website. To compare this option with other fastener inserts and anchors, contact Chemical Concepts for application support.

If you need help selecting a B-Lok brass insert, our team can review your drawings and recommend the best combination of insert size, hole preparation and installation method.