Milton S-516 Straight Foot Tire Inflator Gauge
- 10 to 160 PSI scale, read in 2 lb increments
- 15 inch air hose from trigger to chuck
- Dual head straight foot chuck with lock-on threads
- 1/4 inch NPT air inlet for the compressor line
- Replaceable gauge and valve cartridges
- 1 year warranty from Milton
Last refreshed Sep 11, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A shop style inflator for anyone with a compressor who wants hands-free lock-on filling and serviceable cartridges. Its dual head chuck cannot start a tire that is completely flat.
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ASIN: B0000AXC24Model: S-516Category: Tire Gauges
Overview
Milton builds this inflator gauge around a dual head chuck whose straight foot runs parallel to the hose, with lock-on threads that hold the chuck on the valve while air flows. A trigger feeds compressor air through the hose, and a magnified scale shows the pressure as you fill.
Lock-on threads free a hand while the tire fills, and both the gauge and valve cartridges can be swapped when they wear. Milton points owners of dually or extra large truck tires toward its large bore version. A tire with no air at all needs another way to get started.
Who it's for
Garage owners with a compressor who fill tires on cars, motorcycles, trailers and lawn tractors get a fill and read tool in one hand. Owners of dually trucks, or anyone without a compressor, should look elsewhere.
Pros and cons
- Lock-on threads allow hands-free filling
- Gauge and valve cartridges are replaceable
- Magnifying lens over the full scale
- Full-swivel chuck reaches awkward valves
- Cannot inflate a completely flat tire
- Off-side head can leak until reseated
- Metric scale only by special order
- Needs a separate air compressor
Performance notes
Reading accuracy rests on the gauge cartridge, which can be replaced without retiring the whole tool. The dual head uses a self-sealing valve that relies on tire pressure to close the unused side, so with no pressure in the tire air escapes until the chuck is seated with air already flowing. Lock-on threads hold the chuck to the valve so the trigger does the work.
Specifications
| Brand | Milton |
|---|---|
| Model | S-516 |
| Dimensions & fit | |
| Item weight | 0.1 pounds |
| Item dimensions | 0.5 × 3.5 × 1.1 inches |
| Hose length | 15 inches |
| Capacity & performance | |
| Pressure range | 10 psi |
| Construction & materials | |
| Material Type | Plastic |
| Warranty & support | |
| Warranty Description | 1 year |
| Other details | |
| Scale increments | 2 lb |
| Thread Style | NPT 1/4-24 |
| Air inlet | 1/4 inch NPT |
Frequently asked questions
How do I stop air escaping from the off-side of the Milton S-516 chuck?
Release the trigger and take the chuck off the valve. Point the straight side up, squeeze the trigger so air flows and the sealing valve drops, then seat the chuck on the Schrader valve while air is still flowing.
Can the Milton S-516 inflate a completely flat tire?
No. Dual head chucks rely on tire pressure to seal the unused side, and a tire at 0 pressure gives the self-sealing valve nothing to react to.
Does the Milton S-516 read in kPa?
The standard scale is PSI. An 80 to 840 kPa scale in 20 kPa increments is listed as available by special order.
Is the Milton S-516 right for dually truck tires?
Milton recommends its Dual Head Large Bore gauge for dually or extra large truck tires and valves instead.