Description
Large inch tube nuts often sit hard against valves, blocks and bulkheads, where an open-end wrench gets only a short swing. The Snap-on RTWH72YSL flare nut head lets a Y torque body work those nuts in brief strokes. It slides over the tube through an open ring, then ratchets on 12 points until the body signals.
RTWH72YSL or RTWH72Y?
Lost in HCM lists both numbers for a 1-1/8 in Y ratchet. Snap-on’s CAT1500i prints the RTWH72YSL, so this page follows that number. If a purchase order or tool list names one of them, quote that exact number. Then Lost in HCM can confirm whether the two parts differ.
Snap-on RTWH72YSL flare nut head at a glance
| Opening | 1-1/8 in (28.58 mm), 12-point, ratcheting |
|---|---|
| Shank | Y (0.560 in) |
| Pin to fastener center | 4.43 in (RTWHY) |
| J version | None, J ratchets stop at 7/8 in |
| Standard | Boeing ST2599, per Snap-on |
Between two metric sizes
At 28.58 mm, this opening falls between a 28 mm and a 29 mm hex. A 28 mm nut would sit loose and round off, while a 29 mm nut will not enter at all. So the Snap-on RTWH72YSL flare nut head belongs on inch fittings, such as the plumbing on many US-built chillers, compressors and mobile machines. For metric lines, Snap-on offers ratcheting sizes on special order.
Setting a Y body for the RTWH72YSL
Because the nut sits 4.43 in from the pin, the head acts as a small extension. A Y click body set by its scale therefore puts more torque on the nut than it reads. The CTECH2Y100A ControlTech body, rated 5-100 ft-lb, holds a head-length factor for this case. On a QD3IN200B or QC3P200, ask Lost in HCM for Snap-on’s correction before the first pull.
Care for a large ratchet ring
Large lines shed more oil and grit, and both work into a ratchet. Wipe the RTWH72YSL after use, and turn the ring by hand to feel for a smooth, even action. In addition, look at the slot edges, since a nick there can mark a soft brass nut.
Ordering the Snap-on RTWH72YSL flare nut head
SMK Vietnam features this head for Lost in HCM, which supplies the part and writes each quote. Mention your Y body and the fitting spec. Then request a quote from Lost in HCM for the RTWH72YSL. Related heads appear under torque wrench heads and adaptors, or you can contact SMK Vietnam with fit questions.
RTWH72YSL fit questions
Does the RTWH72YSL fit a 29 mm metric nut?
No. Its 28.58 mm opening is too small for 29 mm, so ask about a metric special order.
Can a J body run a 1-1/8 in ratchet?
No. Snap-on’s J ratcheting list ends at 7/8 in, so this size needs a Y body.
Should I order RTWH72YSL or RTWH72Y?
Use the number on your tool list. Snap-on’s catalog shows RTWH72YSL, and Lost in HCM can check the other.
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