Is the Hornady 390972 replacement cutter compatible with .17 calibre cartridge cases?

No, this standard cutter is designed for .22 calibre up to .50 calibre cases. If you are reloading .17 calibre brass, Hornady requires the dedicated .17 Calibre Pilot and Cutter assembly, which is Item #390942.

What equipment is needed to install and operate the Hornady 390972 replacement cutter?

This replacement cutter is engineered to thread directly into the spindle of the Hornady Cam Lock Case Trimmer (Item #050140). It is a fully manual mechanical component that also accepts standard Hornady calibre-specific trimmer pilots to accurately size your fired brass.

Does this manual reloading accessory require any Australian electrical or RCM certifications?

No electrical compliance certifications such as SAA or RCM are required for the Hornady 390972. Because it is an entirely manual, non-powered steel cutting head, it contains no electronic components or mains-powered motors.

How should I maintain the ultra-hard tool steel cutter to ensure long-term performance on my reloading bench?

To protect the precision edge from corrosion during humid Australian conditions or long-term storage in your workshop, keep the tool steel clean of brass shavings and apply a light coat of gun oil or rust preventative. It is designed to handle high volumes of brass trimming, but it is not rated for hardened steel or titanium machining.

Case Trimmer Cutter - Hornady 390972

The Hornady Cam Lock Trimmer Replacement Cutter (MPN: 390972) is a factory-original cutting head engineered for the Hornady Cam Lock Case Trimmer. Machined from ultra-hard tool steel, this unpowered mechanical component restores square case mouths and trims fired metallic cartridge brass back to specified SAAMI and CIP dimensions. It installs directly onto the trimmer's micro-adjust spindle via male threads and features an internal bore designed to receive standard Hornady calibre-specific trimmer pilots.

Key Features

Ultra-Hard Tool Steel Construction: Delivers sharp, chatter-free edge retention during low-to-medium batch brass trimming.
Direct OEM Fit: Threads seamlessly into the Hornady Cam Lock Case Trimmer (Item #050140) spindle as a drop-in replacement or benchtop spare.
Calibre Adaptability: Houses standard Hornady trimmer pilots to process metallic cartridge brass across standard rifle and pistol calibres.
Mechanical Operation: Fully manual design requiring no mains power, battery packs, or electrical certifications.

Product Specifications

Product Type: Case trimmer replacement cutter head
Manufacturer Part Number (MPN): 390972
Material: Ultra-hard tool steel
Weight: Approximately 0.091 lbs (41.3 g)
Interface: Threaded mount for Hornady Cam Lock spindle; central pilot bore
Calibre Range: .22 calibre up to .50 calibre
Intended Material: Brass and nickel-plated brass cartridge cases

Who is the Hornady Cam Lock Trimmer Replacement Cutter for?

Handloaders preparing mid-to-large rifle brass — requires case length restoration across a calibre range spanning .22 calibre up to .50 calibre using standard Hornady trimmer pilots and this tool steel replacement cutter.
Reloaders maintaining a Hornady Cam Lock Case Trimmer — needs a factory-specification case trimmer replacement cutter weighing approximately 0.091 lbs to replace worn factory blades on the micro-adjust spindle without altering the trimmer's mechanical setup.

Less suitable for: Reloaders trimming small-bore .17 calibre cartridge cases, which fall below the standard .22 calibre pilot threshold and require a dedicated .17 calibre pilot and cutter assembly (Item #390942), or for commercial operations requiring motorized case-trimming dies designed for high-volume automated processing.

SKU	HN102873LP
Model #	390972
Brand	Hornady
Shipping Weight	0.1000kg

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Hornady 390972 Cam Lock Trimmer Cutter Steel Blade

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