Milton S-505 Analog Tire Inflator Gauge 15" Hose — 10–60 PSI, Heavy‑Duty Made in USA

The Milton S-505 is a rugged, made-in‑USA analog tire inflator with a 15" hose and single-head chuck that reads 10–60 PSI for accurate inflation of motorcycles, bikes, and hard-to-reach tire valves.

If you need a simple, serviceable inflator gauge for garages, trunks, or pit kits, the Milton S-505 delivers a heavy-duty body, a magnified dial for easy reading, and replaceable internal cartridges so the tool stays useful for years. Built for practical field use rather than fancy electronics, this gauge brings reliable mechanical accuracy, a full-swivel chuck, and a hose long enough to reach tight valve stems.

How accurate and readable is the Milton S-505 gauge?

The S-505 is performance-tested and calibrated to measure tire pressure between 10 and 60 PSI in 2‑psi increments, providing the resolution most light‑vehicle and motorcycle users need. The dial is fitted with a magnifying lens so readings are easier to see at a glance, and replacement gauge cartridges are available to restore accuracy without replacing the whole tool.

• Range: 10–60 PSI, 2-psi increments
• Performance-tested and calibrated at the factory
• Magnifying window lens for clearer scale reading
• Replacement gauge cartridge available (Milton #507)

Which tire valves and vehicles work best with the single head chuck?

The S-505’s single-head chuck is purpose-built for narrow or recessed valve stems such as motorcycle, bicycle, and some passenger vehicles with hard-to-reach valves. While ideal for single-wheel and light-vehicle applications, owners of dually or extra-large truck tires should consider a dual-head large-bore model for faster fill and better sealing on large valves.

• Single-head chuck works well with motorcycle and bicycle valves
• Full-swivel chuck improves access in tight spaces
• 15" hose gives extra reach to awkward valve positions
• Not optimized for dual-wheel/extra-large truck tires

What construction and serviceability features does the S-505 offer?

Milton designed the S-505 for heavy-duty use: a durable housing, a full-swivel chuck, and a reinforced 15-inch hose that stand up to shop and roadside conditions. The unit’s modular parts—gauge and valve cartridges—are replaceable, reducing long-term cost and downtime versus disposable inflators.

• Heavy-duty construction for extended service life
• 15" hose with 1/4" NPT (and 3/8-24 thread details) inlet options
• Replaceable gauge cartridge (Milton #507) and valve cartridge (Milton #512)
• Other replaceable parts: hose whip (#508) and air chuck (P500-44)

How do I use the S-505 safely and effectively?

Connect the inflator to a regulated air source using the correct inlet thread, attach the swivel single-head chuck to the valve stem, and watch the magnified dial as you add or let out air. Work in small bursts and recheck pressure to avoid overinflation; the clear window and fine 2‑psi increments make precise adjustments straightforward.

• Attach to 1/4" NPT or matched thread air fittings
• Use short air bursts and recheck the dial often
• Use replacement cartridges to maintain accuracy over time
• Consider a dual-head large-bore gauge for heavy-duty truck use

Who is this for: The Milton S-505 is aimed at motorcycle riders, home mechanics, cyclists, and light-vehicle owners who need a reliable, serviceable analog inflator built for practical use. It’s especially useful when valve stems are recessed or hard to reach and for anyone who prefers a mechanical gauge with replaceable parts rather than a fully electronic unit. If you maintain a small workshop, keep a tool in your trunk, or need a rugged inflator for occasional shop work, the S-505 is a dependable choice.