Description
During line bring-up, hydraulic power units get plumbed, flushed, opened and closed again many times. Each 1 in tube nut on those lines may see several torque cycles in a week. The Snap-on RTWH64YSL flare nut head speeds that work. It ratchets on the nut through an open 12-point ring, so the tool stays seated while the handle swings back.
Catalog listing for the RTWH64YSL
| Size | 1 in |
|---|---|
| Type | Ratcheting flare nut head, 12-point |
| Shank | Y (0.560 in) |
| Pin to fastener center | 4.43 in (RTWHY heads) |
| Neighbors | RTWH60YSL (15/16 in), RTWH68YSL (1-1/16 in) |
| Standard | Boeing ST2599, per Snap-on |
This is the exact part number that CAT1500i prints. Lost in HCM also lists an RTWH64Y without the SL letters, so quote the full RTWH64YSL number on your order.
Inch nut, metric neighbor
One inch equals 25.4 mm. So on a 25 mm metric nut, the RTWH64YSL leaves 0.4 mm of play, enough to round the corners. On a 26 mm nut, it will not go on at all. Therefore read the hex with a caliper before you fit the head. Snap-on also builds metric ratcheting sizes on special order, which Lost in HCM can request.
Pairing a Y wrench with the Snap-on RTWH64YSL flare nut head
Snap-on makes no J version at 1 in, because its J ratcheting heads stop at 7/8 in. So this head needs a Y body, such as:
- CTECH2Y100A ControlTech, 5-100 ft-lb, which applies a head-length factor.
- QD3IN200B dual scale, 37-140 ft-lb.
- QC3P200 preset, 40-200 ft-lb, for one fixed value.
Compared with a standard 3.00 in Y head, the 4.43 in reach puts the nut 1.43 in farther out. Hence a click setting needs a correction, and Lost in HCM can pass on Snap-on’s guidance for the RTWH64YSL.
When a solid 1 in head is the better pick
Ratchets win when the arc is short and the nut needs many turns. For a final pull to a firm value, however, a solid ring is simpler to set. Snap-on’s QYRX32A and QYRXS32A both cover 1 in on a Y shank, with a printed 158 ft-lb limit and the 3.00 in spacing. So a practical kit pairs the Snap-on RTWH64YSL flare nut head for run-down with a solid head for the last pull.
Ratchet upkeep for the Snap-on RTWH64YSL flare nut head
Hydraulic fluid carries fine grit into the ratchet pawls. So wipe the head after every job and blow it dry with clean air. Then turn the ring by hand and listen for an even click. Also check the slot edges, since a spread slot grips a 1 in nut unevenly.
RTWH64YSL quotes and supply
Lost in HCM supplies this head and prepares the quote, while SMK Vietnam lists it for that partner. Name your Y body and the fitting value in the request. Then send Lost in HCM an RTWH64YSL quote request. Nearby sizes sit in torque wrench heads and adaptors, or you can contact SMK Vietnam.
RTWH64YSL checks
How does the RTWH64YSL differ from the RTWH64Y listing?
Both describe a 1 in Y ratcheting head. CAT1500i prints only the SL number, so Lost in HCM can confirm any difference.
Which ratchet covers 15/16 in?
The RTWH60YSL, one step below the RTWH64YSL on the same Y shank.
Does Snap-on rate this head for a maximum torque?
Its catalog table prints no rating for ratcheting heads. Lost in HCM can check before you set a high value.
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