Description
Small tube nuts round off easily and hide in awkward places. The Snap-on RTWH24YSL flare nut head gives a Y-shank torque body a 3/8 in ratcheting ring for them. In CAT1500i, it opens the whole ratcheting flare range. Its slotted ring passes over the tube, then ratchets on the nut in short swings.
Why 3/8 in comes only on a Y shank
Snap-on’s J ratchets start one size up, at 7/16 in with the RTWH28JSL. So at 3/8 in, the Snap-on RTWH24YSL flare nut head is the only choice, and it needs a Y body. That pairing looks odd, because small nuts usually take low values. Many Y bodies start their scales well above those values. Therefore the body decides whether this head is useful on your job.
Low-end settings for the Snap-on RTWH24YSL flare nut head
| Y body | Lowest setting | Fit for small tube nuts |
|---|---|---|
| CTECH2Y100A | 5 ft-lb | Best match; stores a head-length factor |
| QC3P150 preset | 30 ft-lb | Only for firm joints |
| QD3IN200B | 37 ft-lb | Starts above many small-nut values |
| QC3P200 preset | 40 ft-lb | Starts above many small-nut values |
Check the maker’s value first. If it sits below 30 ft-lb, the CTECH2Y100A is the only Y body in this list that reaches it. CAT1500i also prints no maximum working torque for the RTWH24YSL, so keep the value modest.
Brake lines on inch-built vehicles
On many US-designed vehicles, 3/16 in brake lines use tube nuts with a 3/8 in hex. Those nuts run along frame rails and under brackets, where a socket cannot pass the line. The RTWH24YSL slides over the tube and turns the nut with a short swing. As a result, the soft nut keeps its corners for the next service. Measure each hex before the job, because metric lines often use 10 mm nuts.
Reach and care for the RTWH24YSL
RTWHY heads sit 4.43 in from the retaining pin to the fastener center. That is 1.43 in more than a standard 3.00 in Y head, so a click body set from its scale will not read true. The CTECH2Y100A corrects for this through its head-length factor. Meanwhile, keep the small ratchet clean, because brake fluid and grit can slow its action. Wipe the Snap-on RTWH24YSL flare nut head after each job and store it dry.
Pricing the 3/8 in ratchet with Lost in HCM
Lost in HCM supplies the RTWH24YSL, and SMK Vietnam lists it as a partner item. Share the body you plan to use and the lowest value on your job. Next, request a quote from Lost in HCM and mention the vehicle or machine type. Larger ratchets sit under torque wrench heads and adaptors, and you can contact SMK Vietnam for help with fit.
Small-size questions on the RTWH24YSL
Can I buy the RTWH24YSL with a J shank?
No. CAT1500i lists no J ratchet at 3/8 in. The J range starts at 7/16 in with the RTWH28JSL.
Which Y body suits the RTWH24YSL best?
The CTECH2Y100A, since it reaches down to 5 ft-lb and can apply a head-length factor.
Does a 10 mm brake nut accept the RTWH24YSL?
No. 3/8 in equals 9.53 mm, which is smaller than a 10 mm hex. Ask Lost in HCM about Snap-on’s metric special-order sizes.
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