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Steel Mandrel 1/4-20 Thread-Setter
Part #: BR-39258
The BR-39258 (Howmet / Marson M39258) steel mandrel is a replacement component designed for 1/4-20 UNC rivet nut installation using the Marson #39200 / HP-3 / “A-L Metric/Thread-Setter” tool. Machined precisely in hardened steel, it ensures strong and accurate thread engagement with 1/4-20 rivet nuts, restoring proper performance for sheet metal, aluminum, composite, or rigid plastic fastening applications where blind installation is needed.
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