Description
Chillers and split air conditioners join copper lines with flare nuts, and the 3/8 in line often carries a 3/4 in hex. The Snap-on RTWH48YSL flare nut head fits that hex from a Y-shank (0.560 in) torque body. Its slotted 12-point ring slides over the copper and ratchets on the nut. So the technician never lifts the head between strokes.
Catalog number versus partner number
CAT1500i prints the 3/4 in Y ratchet as RTWH48YSL. However, Lost in HCM also lists a plain RTWH48Y at the same size and shank. The catalog does not explain the SL letters. Therefore we cannot confirm whether both numbers name one head. Their partner warranty lines differ too, and the RTWH48YSL shows the lifetime, non-repairable line. For a new kit, the catalog number is the cleaner choice.
Snap-on RTWH48YSL flare nut head or its J twin
The same 3/4 in opening also comes on a J shank, as the RTWH48JSL. Choose by the body, not by the nut.
- RTWH48YSL: Y shank, 4.43 in from pin to fastener center, for Y bodies such as the CTECH2Y100A or QC3P150.
- RTWH48JSL: J shank, 3.50 in, for light J bodies such as the QC2I75.
A J body sets low values in finer steps. By contrast, the Y head suits a crew that already runs Y heads on larger lines.
No published limit, so set from the joint
CAT1500i gives no maximum working torque for its ratcheting flare heads, the RTWH48YSL included. So take the value from the equipment maker, and keep the joint inside the body scale. In addition, the 4.43 in reach adds 1.43 in of lever over a standard 3.00 in Y head. A CTECH2Y100A handles this with its built-in head-length factor. For a click body, ask Lost in HCM how Snap-on wants the setting corrected.
A rooftop chiller job for the Snap-on RTWH48YSL flare nut head
Picture a packaged chiller with 3/8 in copper lines crowded behind a service panel. A socket cannot pass the tube, and the handle swings only a short arc. So the technician seats the RTWH48YSL on the flare nut and ratchets it down in small swings. The soft flare sees a steady pull, which protects the seal. Measure the nut before the job, since some makers use 13/16 in on this line size.
Requesting the RTWH48YSL in Vietnam
SMK Vietnam shows this head for Lost in HCM, the partner that supplies it and sets the price. Mention your Y body, the refrigerant line size and the maker’s value. After that, ask Lost in HCM for an RTWH48YSL quote for your service kit. Neighboring ratchets sit in torque wrench heads and adaptors, and you can always contact SMK Vietnam.
Buyer checks for the 3/4 in Y ratchet
Does the RTWH48YSL suit aviation tool lists?
According to Snap-on, the ratcheting flare range complies with Boeing ST2599 specifications. Still, check your own tool list for the exact part number.
Can a 19 mm metric nut take the RTWH48YSL?
The fit is close, since 3/4 in equals 19.05 mm. Even so, a metric nut deserves a metric head, which Snap-on offers on special order.
Do the RTWH48YSL and RTWH48Y share one design?
Not confirmed. Both are 3/4 in Y ratchets, but only the SL number appears in CAT1500i.
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