Extra-Close Shoulder-Jet Air Ring Gage (ARX)

Jets as close to the ring face as possible, for diameters right against a shoulder.

Sizes: .061" to 7.500" (1.55 to 190.50 mm)
Part number: ARX-[jet+class]-[material]-[size]
Example: ARX-12-C-.6250

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Dual Master or Single Master tooling

The extra-close shoulder-jet ring (ARX) sets the jets as close to the face of the ring as they can go. Use it when the diameter you need to check sits right up against a shoulder and a standard shoulder-jet (ARS) ring can't reach it.

As with plugs, put the jets in the middle whenever the part allows; the center-jet (ARC) ring wears best.

Two jets or three?

Two opposed jets read diameter at every angle. Centerless-ground parts are often slightly three-lobed, which two jets can't see; a three-jet ring (add -3J) picks up the lobing and reads average diameter. Sizes .061″ to .183″ are made as three-jet carbide rings only.

How to order

Ring part numbers follow the same order as probes: style, jet code with clearance class (Dual Master) or spec code (Single Master), material, then size. Dual Master rings take the min/max shaft sizes and come with a 4 ft (1.22 m) hose; Single Master rings take the nominal master size, and the hose is ordered separately.

	Dual Master	Single Master
Ring bore	Maximum shaft size + clearance	Nominal master size + clearance
Set with	Two setting discs (min and max)	One setting disc at nominal

Turn it into a gaging station

Base stands hold the ring upright on the bench, vee guide chutes feed long parts such as valve spools straight through, and guide pins steady short parts. Each is fitted to the ring at the factory, so order it with the ring. For shafts that stay on the machine, use an air snap gage. Set the ring with master setting discs.

Full dimensions are in the air tooling catalog (PDF).