Loctite Loctite C5A Anti-Sieze Lubricant - 4 Oz. Brush Top Can

The Loctite C5A Anti-Seize Lubricant is a copper-based barrel thread compound trusted by professional gunsmiths and serious shooters who need reliable protection against seized and galled threads. Whether you're building a rifle, doing a barrel installation, or performing routine maintenance on firearms and equipment, this anti-seize lubricant creates a high-temperature barrier that keeps threaded connections from freezing solid under heat and pressure.

The 4 oz brush-top can makes application straightforward—brush it directly onto barrel threads, muzzle devices, action screws, and any other mating parts where heat, vibration, or corrosion could cause seizing. The high copper content works on all common firearm materials: steel alloys (including stainless), brass, cast iron, and copper. It meets military specification MIL-PRF-907, so it's formulated to perform in demanding conditions. For range sessions and field work, the brush applicator lets you coat threads evenly without mess.

Keep a can at your bench for builds and repairs, and grab a tube for your range box if you need a compact supply. This is the compound gunsmiths reach for when reassembly must stay tight and corrosion-free, even after years in the safe or in the field.

Key Features

• Copper-based formula prevents thread seizing and galling under high heat
• Brush-top applicator for precise, mess-free application
• Works on steel alloys, stainless steel, brass, cast iron, and copper
• Meets military specification MIL-PRF-907
• 4 oz size suitable for gunsmithing, barrel installations, and maintenance
• Professional-grade compound preferred by gunsmiths

Specifications

Frequently Asked Questions

What is anti-seize lubricant used for on firearms?

Anti-seize protects threaded connections—like barrel threads, muzzle brake mounts, and action screws—from seizing, galling, and corrosion caused by heat and time. It ensures that parts can be disassembled later without damage or stuck components.

Can I use Loctite C5A on stainless steel barrels and components?

Yes. This anti-seize compound is formulated to work on all steel alloys, including stainless steel, as well as brass, cast iron, and copper.

How do I apply the anti-seize compound?

The 4 oz can includes a brush-top applicator. Simply brush the compound directly onto clean threads and mating surfaces before assembly.

Is this product suitable for professional gunsmithing?

Yes. The Loctite C5A is the barrel thread compound used and preferred by professional gunsmiths for builds, barrel installations, and repair work.