Marson M39358 Insert Tool Mandrel 1/4-20

Product Description

The MARSON M39358 is a 1/4-20 mandrel designed for use with the MARSON 39300 threaded insert installation tool. The mandrel threads directly into the tool head and engages the rivet nut or threaded insert during the pulling stroke, allowing the installer to set inserts consistently and accurately. Weighing 0.3 pounds, it is a compact, single-piece component that requires no special maintenance beyond keeping threads clean and free of debris. This is a replacement or spare mandrel intended for professionals who run threaded insert tools regularly in production or field environments.

This mandrel is suited for applications where 1/4-20 threaded inserts are being installed into sheet metal, thin-wall tubing, or composite panels. Common use cases include HVAC cabinet fabrication, electrical enclosure assembly, automotive body work, and general sheet metal work. It is sold individually, making it practical to keep a spare on hand when a mandrel shows wear or thread damage from high-cycle use.

Key Features

• 1/4-20 thread size for direct engagement with standard 1/4-20 threaded inserts and rivet nuts
• Designed specifically for use with the MARSON 39300 insert installation tool
• Lightweight at 0.3 pounds for easy handling during repetitive installation tasks
• Sold as a single unit, suitable as a replacement or backup mandrel
• Fits the rivet nut and threaded insert tool category for professional hand tool applications

Compatibility

Designed for use with the MARSON 39300 threaded insert installation tool, accepting 1/4-20 threaded inserts and rivet nuts.

Installation Notes

Thread the mandrel fully into the insert tool head by hand before applying any load, ensuring the threads are fully engaged to prevent cross-threading or premature wear. Power down or disconnect any pneumatic or hydraulic supply before swapping mandrels on a powered tool. Always verify the mandrel thread size matches the insert being set before beginning a pull cycle. Inspect mandrel threads regularly and replace at the first sign of deformation or stripping.