Marson M39355 Insert Tool Mandrel 8-32

Product Description

The MARSON M39355 is an 8-32 threaded insert tool mandrel designed for use with rivet nut and threaded insert installation tools. The mandrel threads onto the nose of a compatible insert tool and engages the internal threads of a rivet nut, allowing the tool to pull and set the fastener into sheet metal, fiberglass, or similar thin-material substrates. At 0.3 pounds, this is a compact, single-piece hand tool accessory that belongs in any shop or field kit where threaded inserts are installed regularly. Professionals across assembly, fabrication, HVAC, and general mechanical trades rely on properly matched mandrels to achieve consistent, damage-free installs.

This mandrel is sized specifically for 8-32 UNC threaded rivet nuts. It is used in applications where a permanent, load-bearing threaded connection is needed in a base material that cannot accept a standard tapped thread - common in sheet metal panels, equipment enclosures, and light structural assemblies. The M39355 is specified for use with the MARSON 39300 insert tool, making it a direct replacement or spare for that tool configuration.

Key Features

• Sized for 8-32 UNC thread pitch - matches standard 8-32 rivet nuts
• Specified for use with the MARSON 39300 threaded insert tool
• Lightweight at 0.3 pounds - minimal added weight in a tool pouch
• Single-piece mandrel design for direct thread engagement
• Sold individually - one mandrel per package

Compatibility

Designed for use with the MARSON 39300 rivet nut and threaded insert tool. Fits 8-32 UNC threaded rivet nuts and inserts.

Installation Notes

Thread the mandrel fully onto the nose assembly of the compatible insert tool before placing a rivet nut onto the mandrel. Ensure the mandrel is hand-tight and seated properly before actuating the tool to avoid cross-threading or mandrel damage. After setting the insert, back the tool off by reversing the mandrel thread direction - do not pull the tool away without unthreading. Inspect the mandrel threads periodically for wear, as a damaged mandrel can cause improper set and fastener failure.