Flare Nut Head – QYRX18A

The flare nut head QYRX18A belongs to the Snap-on 12-point Y-shank flare nut heads range, and Lost in HCM supplies it to workshops and factories across Vietnam. It uses the Y (0.560") shank size, so it fits handles built for that shank. Its maximum recommended working torque is 67 ft-lb, about 90.8 N·m.

Flare nut head QYRX18A overview

The flare nut head QYRX18A is a 12-point inch head for Y-shank interchangeable head torque wrenches. Its slotted ring slips over a fluid line and then grips the tube nut. So you can torque large line fittings without a crowfoot.

Snap-on builds this family in the USA, with sizes from 9/16 inch up to 1-5/8 inch. Every head uses the Y shank, which measures 0.560 inch. Meanwhile, maximum recommended torque runs from 67 ft-lb to 160 ft-lb, depending on size.

The size is 9/16 inches. Snap-on lists the country of origin as USA. The head o.d is 31/32 inches.

The head depth is 13/32 inches.

Specifications at a glance

These figures come from the Snap-on listing for QYRX18A. Values marked “calculated” are unit conversions we added for convenience.

How the flare nut head works

An interchangeable head wrench ends in a socket instead of a fixed ratchet head. You push the head shank into that socket until it locks in place. Then the wrench reads torque through the head, so the click still marks your value.

The flare nut head has a slot cut through one side of its 12-point ring. First, you pass the slot over the tube and seat the ring on the nut. Next, you pull the handle smoothly until the wrench signals, and you stop at once.

Key features of the flare nut head QYRX18A

The details below explain why these heads protect large fittings and fit tight spaces. They also show what to check before you add a new head to your Y-shank wrench set.

• Twelve-point flare nut ring. The 12-point ring seats on the tube nut every 30 degrees around the fitting. Therefore, you can place the handle where it clears frames, hoses, and brackets.
• Slotted opening for tubing. A slot through the ring lets the head pass over hydraulic, fuel, and coolant lines. As a result, you can reach a tube nut on an installed line without removing the tubing.
• Y shank on every head. Every head in this family uses the Y shank, which measures 0.560 inch across. So they pair only with Y-shank wrench bodies, including CDI preset and adjustable models.
• Published torque limits. Snap-on lists a maximum recommended torque for each size, from 67 ft-lb up to 160 ft-lb. That figure tells you how far to set the wrench before the ring risks spreading.
• Large inch size range. Sizes run from 9/16 inch up to 1-5/8 inch across fifteen heads. Because of this, one Y-shank wrench body plus a set of heads covers most large inch line fittings.
• Compact head depth. Listed head depths start at 13/32 inch on the smallest size and grow with nut size. Thin heads slide between a fitting and a bracket, while larger heads gain strength from extra depth.

Typical applications

A 12-point flare nut head earns its place where handle swing is tight and a socket cannot reach. The tasks below are the most common uses we see from buyers. Each one also rewards a known torque value.

• Hydraulic tube fittings. Loaders, presses, and lifts use large JIC and similar flare fittings in inch sizes. These heads suit that work, because their ratings reach up to 160 ft-lb.
• Power steering and cooler lines. Steering and transmission cooler lines often run close to the frame. Thanks to the 30-degree steps, the head fits nuts where a 6-point ring would need more swing.
• Coolant and lube oil lines. Machine tools and compressors use tube nuts on coolant and lube oil lines. So maintenance teams use these heads to tighten fittings to a known value without rounding them.
• Heavy equipment hydraulic service. Excavators and cranes carry large inch fittings on boom and swing circuits. Therefore, the larger heads give service crews a calibrated way to seal high-pressure lines in the field.
• Ground support equipment lines. Aircraft ground equipment and some aircraft systems use inch tube fittings with set torque values. In addition, a slotted head reaches these nuts with the tubing still in place.
• Production line quality checks. On assembly lines, a preset Y-shank wrench with a flare nut head gives every operator the same result. Also, the wrench signal makes each tightened joint easy to confirm.

Industries that use the flare nut head QYRX18A

Large inch flare nut heads matter wherever big tube fittings must seal at a known torque. The industries below rely on them every day. Many of these teams also work in FDI plants and service centers across Vietnam.

• Heavy equipment maintenance. Excavators, cranes, and forklifts rely on inch hydraulic fittings in many US-designed models. For this reason, mining and construction contractors in Vietnam use Y-shank heads on high-pressure lines.
• Truck and fleet service. Truck dealers and fleet workshops torque large cooler, steering, and hydraulic lines on US models. In Vietnam, FDI logistics fleets often require documented torque, so calibrated heads help them pass audits.
• Factory maintenance. Plants in Binh Duong, Dong Nai, and Bac Ninh run US presses and molding machines with inch hydraulic lines. Maintenance teams also need tools that leave a clear torque record for ISO audits.
• Energy and power plants. Turbines, compressors, and generator sets use tube fittings on lube oil and instrument lines. So power plant crews in Vietnam use these heads to tighten larger fittings without damage.
• Aviation maintenance. MRO teams at Vietnamese airports service ground equipment and aircraft systems with inch tube fittings. Therefore, a slotted head on a calibrated wrench helps them meet the stated torque.
• Shipbuilding and marine. Shipyards in Hai Phong and Vung Tau install hydraulic steering and winch lines with large fittings. In addition, marine crews need heads that reach tight engine room spaces.

Flare nut head QYRX18A compared with similar brands

Before you buy, it helps to see how the flare nut head QYRX18A compares with other head systems. However, the head alone is not the key question. Instead, check whether it fits the wrench bodies your team already owns and calibrates.

Choose the head system that matches your wrench bodies first, then compare size range and torque limits. Snap-on 12-point heads suit large inch fittings on Y shanks. Meanwhile, metric-heavy plants may prefer other systems, so confirm current specs with each maker. Specifications change over time, so confirm current data with each maker before you decide.

Choosing the right model

• Check the shank of your wrench body first. These heads use the Y shank only, so a J-shank wrench cannot accept them.
• Measure the tube nut across its flats before you order. Inch and metric sizes look close, but a loose fit can round the nut under torque.
• Compare the fitting spec with the head rating for that nut size. For example, the 11/16 inch head lists 92 ft-lb, so higher specs need another method.
• Choose 12-point heads when handle swing is tight and 6-point heads when fittings are soft. A 6-point ring grips more of each flat, while a 12-point ring resets faster in tight spots.
• Plan a full set when one wrench body serves many jobs. That way, technicians switch heads instead of reaching for an uncalibrated line wrench.
• Check the head depth if the nut sits close to a bracket or a second fitting. Depths vary by size, so compare the listed value with the gap you have.

For other sizes in the same range, compare Flare Nut Head – QYRX30A, Flare Nut Head – QYRX32A, Flare Nut Head – QYRX34A, Flare Nut Head – QYRX28A. Also browse the full Snap-on torque tools shop for handles, testers and adapters.

Care, storage and calibration

• Store each head in a drawer slot or case, away from loose tools. Then the slot edges and the shank stay free of nicks that affect fit.
• Wipe off hydraulic oil, coolant, and dirt after each job with a dry cloth. Also check the slot for burrs, because a burr can mark the fitting.
• Send the wrench body for calibration every 12 months or 5,000 cycles, as ISO 6789-1:2017 recommends. We can arrange recalibration through an accredited laboratory.
• Never set the wrench above the head's maximum recommended torque. Too much load can spread the slotted ring, so retire any head with a widened opening.
• Pack heads in a padded case for transport between sites. In addition, keep them dry during the humid season so the finish and shank stay clean.

Frequently asked questions

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