Is the Hornady 170405 hopper cap compatible with powder measures from other brands like RCBS or Lee?

No, this cap is specifically engineered to fit standard Hornady Lock-N-Load cylindrical hopper tubes and is not guaranteed to fit third-party powder measures. It serves as an exact OEM factory replacement part for the Hornady Lock-N-Load Powder Measure item #050069 and related Hornady manual or case-activated assemblies.

Can I use this friction-fit cap for long-term storage of reloading propellant on my reloading bench?

Handloaders storing propellant long-term should return powder to its original factory container rather than relying on this cap for airtight, moisture-proof bulk storage. The cap and hopper tube are designed for bench operations to keep out dust and debris, not for long-term chemical preservation.

Does this mechanical rubber accessory require any electrical safety compliance or SAA approval for use in Australia?

No, the Hornady 170405 is a purely mechanical, unpowered rubber accessory weighing approximately 0.046 lb. Consequently, Australian 240V mains power, SAA safety approvals, and RCM compliance labels are not applicable.

What material is the Hornady 170405 cap made of, and how should I care for it to prevent degradation?

The cap is constructed from molded flexible rubber to snugly seal the open top of the powder hopper reservoir. To maximize its lifespan, avoid prolonged exposure to direct UV sunlight, extreme heat, or caustic solvents like chlorinated brake cleaners which can crack or degrade the elastomeric seal.

Powder Hopper Cap - Hornady 170405

The Hornady Hopper Cap For Lock-N-Load Powder Measure (MPN: 170405) is a factory OEM replacement lid designed to seal standard reloading powder reservoirs. Manufactured from molded flexible rubber, this unpowered friction-fit cap mounts directly onto the top of standard Hornady Lock-N-Load hopper tubes (part #398520 and #480170). Weighing approximately 0.046 lb, it prevents airborne particulate matter, dust, bench debris, and pet hair from contaminating exposed propellant while reducing the risk of accidental powder spills caused by normal reloading press vibration.

Key Features

Contaminant Barrier: Encloses the top opening of standard Hornady hopper tubes to protect reloading propellant from dust, workshop debris, and airborne foreign matter during bench sessions.
OEM Direct-Fit Replacement: Matches factory specifications to replace lost, cracked, stretched, or UV-degraded original rubber caps on standard Hornady powder measure hoppers.
Spill Reduction: Snugly grips the reservoir rim via elastomeric friction to retain powder during repetitive reloading cycles and standard bench vibrations.
Passive Design: Requires no batteries, electrical wiring, or compliance labeling, providing a purely mechanical seal for metallic handloading setups.

Specifications

Brand: Hornady
Manufacturer Part Number (MPN): 170405
Material: Molded flexible rubber
Weight: Approximately 0.046 lb (~21 g)
Primary Measure Compatibility: Hornady Lock-N-Load Powder Measure (Item #050069) and Hornady Quick Trickle
Hopper Tube Compatibility: Hornady factory hopper tubes #398520 and #480170
Power Requirements: None (passive mechanical component)

Who is the Hornady Hopper Cap For Lock-N-Load Powder Measure for?

Metallic cartridge handloaders using Hornady Lock-N-Load powder measures — needing to restore an exact OEM dust seal over their reservoir without adding bulk to the assembly, using a dedicated molded rubber powder measure hopper cap weighing just 0.046 lb.

Less suitable for: Handloaders seeking long-term propellant preservation, as this friction-fit bench cap does not provide an airtight or moisture-proof barrier; powder must instead be returned to its original airtight factory propellant container.

SKU	HN42694LP
Model #	170405
Brand	Hornady
Shipping Weight	1.0000kg

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Hornady 170405 Hopper Cap Lock N Load Rubber

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