Description
Big hydraulic lines on presses, cranes and mining machines end in tube nuts close to two inches across. Turning one with an open-end wrench means many flips and a real chance of spreading the jaw. The Snap-on RTWH120Y flare nut head takes a 1-7/8 in nut instead. It slips over the tube, wraps the nut on 12 points, and then ratchets for each new stroke.
What the listing confirms for the RTWH120Y
- Opening: 1-7/8 in, 12-point, ratcheting.
- Shank: Y (0.560 in).
- Standard: Boeing ST2599, per the Snap-on data in the listing.
Snap-on’s CAT1500i table stops at 1-5/8 in with the RTWH104YSL. So the RTWH120Y, with no SL letters, comes from the partner listing rather than that table. For the same reason, we do not quote a pin distance for it.
Where a 1-7/8 in ratchet saves time
Large tube nuts often need several full turns before they seat. Meanwhile, hoses, frames and valve blocks leave only a short arc for the handle. In that case, the RTWH120Y ratchet lets you keep the head on the nut for the whole run-down. Typical spots include pump outlets, cylinder feeds and return manifolds on heavy equipment. Also measure each nut across flats, because hex sizes vary by fitting type and maker.
Y body range for the Snap-on RTWH120Y flare nut head
A large nut often carries a large torque value, and the head cannot raise the body’s ceiling. Snap-on’s Y bodies cover these bands:
- QC3P200 preset: 40-200 ft-lb.
- QD3IN200B dual scale: 37-140 ft-lb.
- CTECH2Y100A ControlTech: 5-100 ft-lb, with a head-length factor.
If your fitting spec sits above the body you own, the Snap-on RTWH120Y flare nut head is the wrong route. Instead, talk to Lost in HCM about a heavier method.
Snap-on RTWH120Y flare nut head or a smaller ratchet
The RTWH120Y sits at the top of Snap-on’s ratcheting sizes in the partner range. Below it, the catalog lists Y heads such as the 1-1/2 in RTWH96YSL and the 1-5/8 in RTWH104YSL. So measure before you order, since a head one size too big will round a costly fitting.
Care for a large ratcheting head
A big head carries more grit into the ratchet, so clean it after every hydraulic job. Then check the ring gap with a straight edge, because heavy pulls can spread it. Finally, store the RTWH120Y on its own, away from smaller heads that could knock it.
Sending an RTWH120Y enquiry
Lost in HCM supplies this head and handles every quote, and SMK Vietnam lists it for them. Give your Y body model, the nut size and the joint value. Next, put your RTWH120Y enquiry to Lost in HCM. More sizes sit in torque wrench heads and adaptors, or you can contact SMK Vietnam.
RTWH120Y: what buyers check
Is the RTWH120Y in Snap-on’s printed catalog?
Not in CAT1500i, which lists Y ratcheting heads up to 1-5/8 in. The size comes from the partner listing.
Which wrench body suits the RTWH120Y?
Any Y-shank interchangeable body, provided its range covers your joint value.
Does Snap-on publish a torque limit for this head?
No limit appears in the data we checked. So ask Lost in HCM before you work near the top of a body.
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