1839046 – SERVICE HEX KEY ADAPTER

Dual-size hex key adapter that fits 3/16″ and 5/16″ service valve stems — the two most common sizes on residential and light commercial AC systems. Saves you from digging through a hex key set every time you need to open a service port. Compact enough to keep on your gauge hose set.

Specs: 3/16″ and 5/16″ hex sizes, by Hilmor

Replaces: 1839046

Fits: Standard refrigeration service valves on AC condensers and heat pumps

In stock at Open To Public HVAC Parts in Dallas. We test parts at the counter before you buy. Call or text (214) 340-9421.

Specs

• TypeHand tool

Cross-reference numbers

This part replaces the following OEM and aftermarket numbers:

• HILMOR1839046

Not sure if your number matches? Call (214) 340-9421 or bring the old part in — bench-testing is free.

Fits these models

• HILMOR1839046SERVICEHEXKEYADAPTER316X516HEXSWHKA
• KLEINTOOLS86939
• KLEINTOOLS86939HEXADAPTERFORREFRIGERATIONWRENCH

What tools do I actually need to change a capacitor or a contactor?

A nut driver set, insulated screwdrivers, needle-nose pliers and a meter. That is most of the residential electrical work. Add a crimper and wire strippers if you are doing anything with terminals.

What size nut driver fits HVAC panel screws?

5/16 inch covers the large majority of panel and blower screws, with 1/4 inch second. If you buy one driver, buy 5/16.

Insulated tools - necessary or marketing?

Necessary if you are working near live terminals, which on HVAC you often are. Insulated handles are a second line of defence, not a substitute for killing power at the disconnect and confirming zero volts.

What is a fin comb for?

Straightening bent condenser fins so air can get through the coil again. Hail, weed trimmers and pressure washers all bend them, and a flattened coil quietly costs capacity all summer.

Do you stock these?

On the shelf at 10226 Plano Rd, Suite 104 in Dallas.