Description
A 5/8 in tube nut is small, but it often sits on a circuit that a Y torque body already serves. Swapping to a J wrench for one size slows the job. The Snap-on RTWH40YSL flare nut head keeps the Y body in hand. Its slotted ring drops over the tube, grips the nut on 12 points and ratchets back for the next stroke.
Snap-on RTWH40YSL flare nut head catalog facts
- Opening: 5/8 in, 12-point, ratcheting, open ring.
- Shank: Y (0.560 in).
- Pin to fastener center: 4.43 in for RTWHY heads.
- J-shank twin: RTWH40JSL, with a 3.50 in reach.
- Boeing ST2599 compliance, as Snap-on states.
Two shanks at 5/8 in
Snap-on builds this opening for both J and Y bodies. So the choice follows the wrench you already own, not the nut. Pick the Snap-on RTWH40YSL flare nut head when a Y body works the station. However, very low specs may read better on a J body, because its scale starts lower. For example, the J-shank CTECH1J240A runs from 1 ft-lb, while the Y-shank CTECH2Y100A starts at 5 ft-lb.
Inch opening, metric nut
A 5/8 in opening equals 15.88 mm, which is slightly smaller than a 16 mm hex. So a metric 16 mm nut may refuse to enter the ring or bind on the points. Therefore, keep the RTWH40YSL for inch fittings and measure any part of unknown origin. Snap-on also offers metric ratcheting sizes on special order, and Lost in HCM can ask for one.
Leverage from the longer RTWHY reach
The RTWH40YSL puts the nut 4.43 in out from the locking pin, like every RTWHY head. A plain QYRX flare head puts it at 3.00 in, so this ratchet adds 1.43 in of lever. As a result, a click body set straight from its scale delivers more torque than it shows. The CTECH2Y100A applies a head-length factor for you. With a QD3IN200B or QC3P150, ask Lost in HCM how Snap-on wants the value corrected.
Where the Snap-on RTWH40YSL flare nut head fits
On SAE 45-degree flare fittings, the nut for 5/16 in tube commonly measures 5/8 in. Fuel, oil and gauge lines on US-built compressors and engines use that tube size. Makers vary, though, so measure each nut before you order.
RTWH40YSL quote request
SMK Vietnam lists the RTWH40YSL for its partner Lost in HCM, which supplies the head and prepares the price. State your Y body model and the fitting spec. Then request a quote from Lost in HCM. Other sizes sit under torque wrench heads and adaptors, and you can contact SMK Vietnam at any time.
RTWH40YSL buyer FAQ
Is there a J version of the RTWH40YSL?
Yes. The RTWH40JSL has the same 5/8 in opening on a J shank.
Does the 5/8 in ratchet fit a 16 mm metric nut?
Not reliably. Measure the nut, or ask Lost in HCM about a metric special order.
Why does this head need a setting correction?
It reaches 4.43 in from the pin, longer than a standard Y head, so it adds leverage.
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