What thread size does the Kleenbore 37/40mm Phosphor Bronze Bore Brush use?

The Kleenbore GLB40/LL-1304 uses standard large-bore American #5/16-27 threads. Please note that these larger threads will not directly fit standard rifle or pistol cleaning rods that use #8-32 threads unless you use a conversion adapter.

Can I use this bore brush on standard 12 gauge shotguns or smaller firearms?

No, this brush is sized specifically with an internal diameter of approximately 1.45 to 1.57 inches for 37mm and 40mm launcher barrels. It cannot be used in standard small arms like handguns, rifles, or 12 gauge shotguns, which require calibre-specific brushes.

Will harsh firearm solvents and CLPs damage the phosphor bronze bristles?

The high-density, straight phosphor bronze bristles are built to withstand exposure to standard firearm cleaning solvents and mil-spec CLPs. They provide rigorous scrubbing power to scour away carbon buildup and powder fouling without harming your barrel's interior.

40mm Bore Brush - KleenBore GLB40 LL-1304

The KleenBore 37/40mm Phosphor Bronze Bore Brush (Model GLB40 / LL-1304) is a heavy-duty mechanical cleaning tool engineered specifically for large-bore launcher systems. Built with high-density phosphor bronze bristles wound over a durable aluminium and steel core, this brush provides aggressive scouring power to strip away stubborn carbon fouling, powder residue, and chemical build-up without eroding smoothbore tubes or rifled launcher barrels. It features standard American large-bore #5/16-27 threads, making it a direct-fit replacement component for dedicated 37mm and 40mm launcher maintenance kits.

Key Features

Phosphor Bronze Bristles: Delivers non-abrasive scrubbing action that removes burnt powder and projectile deposits while preserving the bore's structural integrity.
Dedicated Large-Bore Sizing: Engineered to fit both 37mm (~1.45 in) and 40mm (~1.57 in) internal diameter barrels.
Standard Thread Interface: Features standard #5/16-27 threads to connect directly with compatible shotgun and large-bore cleaning rods.
Solvent Resistant: Built to withstand prolonged contact with standard firearm solvents, bore cleaners, and Mil-Spec CLPs.

Specifications

Brand: KleenBore
Model / MPN: GLB40 / LL-1304
Bore Compatibility: 37mm and 40mm launcher barrels
Bristle Material: Phosphor bronze
Core Material: Aluminium and steel
Thread Size: #5/16-27 standard large-bore threads

Who is the Kleenbore 37/40mm Phosphor Bronze Bore Brush for?

Law Enforcement Tactical Armourers — Requires a 37/40mm bore brush with standard #5/16-27 threads to scrub heavy powder and chemical residue out of 37mm and 40mm less-lethal launcher barrels.
Military Armourers and Personnel — Requires a dedicated 40mm phosphor bronze bore brush to scour fouling and carbon accumulation from standard 40mm grenade launcher tubes.
Maritime and Aviation Safety Operators — Requires an oversized 37mm bore brush to service and maintain dedicated 37mm emergency signalling and flare launcher systems.

Less suitable for: Standard small arms with barrel diameters below 37mm (such as handguns, rifles, or 12 GA shotguns), which require calibre-specific small-bore cleaning brushes, or artillery systems and vehicle mortars exceeding 40mm in diameter, which require heavy industrial artillery brushes.

SKU	KLB41007LP
Model #	GLB40/LL-1304
Brand	Kleenbore
Shipping Weight	1.0000kg

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Kleenbore Glb40 Ll-1304 Bore Brush 37mm 40mm Phosphor Bronze

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