Description
Instrument tubing and pilot lines on US-built machines often end in 9/16 in nuts. These lines run in bundles, so a wrench rarely gets a full swing. The Snap-on RTWH36JSL flare nut head ratchets on that nut in short strokes. It passes over the tube through its open ring, then grips the nut on 12 points.
What Snap-on lists for the 9/16 in J ratchet
- RTWH36JSL opening: 9/16 in, 12-point, ratcheting, open ring.
- Shank: J (0.425 in).
- Pin to fastener center: 3.50 in (RTWHJ heads).
- Y-shank twin: RTWH36YSL.
- Snap-on states that the head meets Boeing ST2599.
9/16 in against 14 mm
A 9/16 in opening measures 14.29 mm. So the RTWH36JSL sits about 0.3 mm loose on a true 14 mm nut. That gap lets the points ride up on soft brass. Therefore keep this head for inch nuts, and measure any fitting of unknown origin first. For metric lines, Snap-on builds metric ratcheting sizes on special order, so Lost in HCM can ask for one.
Where the Snap-on RTWH36JSL flare nut head earns its keep
On 37-degree JIC systems, the -4 nut for 1/4 in tube commonly measures 9/16 in. Gauge lines, pilot lines and small lube feeds use that size often. In addition, some brake and fuel unions on US vehicles fall here. In each case, the Snap-on RTWH36JSL flare nut head keeps hold of the nut between strokes. As a result, the fitter avoids the flip-and-refit cycle of an open-end wrench.
Solid or ratcheting at 9/16 in
| Part | Style | Shank | Printed rating |
|---|---|---|---|
| RTWH36JSL | Ratcheting 12-point | J | None |
| RTWH36YSL | Ratcheting 12-point | Y | None |
| QYRX18A | Solid 12-point | Y | 67 ft-lb |
| QJRXS18A | Solid 6-point | J | Sources differ |
So the RTWH36JSL wins on access, while the solid QYRX18A gives you a printed limit for a firm spec.
Setting a J body for the Snap-on RTWH36JSL flare nut head
Standard J heads sit 2.50 in from the pin, but RTWHJ heads sit 3.50 in out. That extra inch adds leverage, so a click body set by its scale shows less than the nut receives. The CTECH1J240A ControlTech body, rated 1-20 ft-lb, stores a head-length factor for this case. With a QC or QD body, ask Lost in HCM how Snap-on wants the setting corrected.
Quote path for the RTWH36JSL
SMK Vietnam features the RTWH36JSL for its partner Lost in HCM, which supplies the head and prepares the price. Include your J body model and the fitting spec. After that, ask Lost in HCM for an RTWH36JSL quote. Related heads appear under torque wrench heads and adaptors, and you can contact SMK Vietnam at any time.
RTWH36JSL: before you buy
Does the RTWH36JSL fit a -4 JIC nut?
Often, since many -4 JIC nuts measure 9/16 in. Measure the hex to be sure.
Which shank should I choose at 9/16 in?
Match the body you own. The RTWH36JSL suits J bodies, and the RTWH36YSL suits Y bodies.
Is a torque limit printed for it?
No. CAT1500i shows no rating column for ratcheting flare nut heads, so ask Lost in HCM.
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