Product Description

The Astro Tools 1/4"-20 Long Mandrel (SKU: LM1/4-20) is a precision-machined replacement part designed specifically for Astro Pneumatic hand rivet nut setters, particularly the heavy-duty Astro 1450 series. Over hundreds of pulling cycles, even the toughest tool steel can experience thread wear, stretching, or snapping. This replacement long mandrel allows technicians to affordably repair their existing tool rather than purchasing an entirely new rivet gun assembly.

Crafted from high-strength steel alloy and finished with a durable black oxide coating to resist corrosion, this mandrel is built to withstand the immense mechanical leverage required to set 1/4"-20 threaded inserts into sheet metal and structural framing. Because it features an extended "Long Mandrel" profile, it provides the necessary clearance and stroke length required by specific Astro rivet nut setters, ensuring your shop experiences minimal downtime during custom fabrication or collision repair projects.

Key Features

• Extended Profile: Features the specific "Long" shaft profile required to fit properly within the Astro 1450 series and compatible hand rivet nut setters.

• 1/4"-20 Thread Pitch: Perfectly machined to securely grip and set standard SAE 1/4"-20 threaded rivet nuts without cross-threading.

• Heavy-Duty Steel Alloy: Forged from high-grade steel to resist the extreme tensile pulling forces generated during heavy-duty blind riveting.

• Black Oxide Finish: Coated in an industrial black oxide finish to naturally resist shop corrosion, rust, and thread galling over time.

• Cost-Effective Repair: Provides a direct, drop-in replacement that restores your broken or worn tool to factory working condition in seconds.

Ideal For

• Tool Maintenance: Affordably rebuilding an Astro Pneumatic 1450 hand riveter that has suffered a snapped, stripped, or worn internal mandrel.

• Custom Fabrication: Setting reliable 1/4"-20 SAE mounting points into brackets, chassis plates, and body panels without tool downtime.

• Professional Auto Body Shops: Keeping essential spare parts on hand to prevent workflow interruptions during complex structural installations.

Common Questions

Q: What is the difference between this mandrel (LM1/4-20) and the standard 1442-A32 mandrel?
A: The "LM" in LM1/4-20 stands for Long Mandrel. While both mandrels feature a 1/4"-20 thread pitch, this specific unit has an extended shaft length. It is designed to fit specific tool geometries, such as the Astro 1450 hand riveter, which requires a longer internal reach and stroke than the more compact 1442 series.

Q: Does this include the exterior nosepiece?
A: No, this product (LM1/4-20) is the threaded internal replacement mandrel only. You will need to reuse the existing outer metal nosepiece currently installed on your rivet tool.

Q: Can I use this on an air-powered rivet gun?
A: No. This replacement mandrel is specifically machined and threaded for Astro Pneumatic's manual (hand-lever) rivet nut setters. It is not designed to thread into pneumatic-hydraulic air guns like the PRN series or drill adapters like the ADN14.

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