Description
Copper flare joints on chillers and split units must seal without a cracked flare. Meanwhile, the nut often sits behind a valve body, where a socket cannot reach. The Snap-on RTWH52JSL flare nut head covers 13/16 in nuts in that kind of spot. Its open ring passes the tube, and the ratchet lets you finish the nut in short strokes.
RTWH52JSL in brief
- Opening: 13/16 in, 12-point, ratcheting.
- Shank: J, 0.425 in.
- Pin to fastener center: 3.50 in (RTWHJ).
- Built to Boeing ST2599, according to Snap-on.
Fittings with a 13/16 in hex
On many hydraulic hoses, the -6 O-ring face seal nut for 3/8 in tube measures 13/16 in. Some 3/8 in refrigerant flare nuts use the same hex, while others use 7/8 in. Also, a few fuel and coolant unions on engines and compressors fall here. Since makers differ, measure the nut across flats before you order.
Your 13/16 in options from Snap-on
| Part | Type | Shank |
|---|---|---|
| RTWH52JSL | Ratcheting, 12-point | J |
| RTWH52YSL | Ratcheting, 12-point | Y |
| QJRXS26A | Solid, 6-point | J |
| QYRXS26A | Solid, 6-point, 117 ft-lb | Y |
| QYRX26A | Solid, 12-point, 117 ft-lb | Y |
So the Snap-on RTWH52JSL flare nut head is the light, fast choice in this group. On the other hand, a solid 6-point head protects a soft or worn nut better. Choose a Y head when the joint needs a firm spec, because Snap-on rates the Y solid heads well above J bodies.
Setting a click body for the RTWH52JSL
The ratcheting ring sits 3.50 in from the pin, an inch beyond standard J heads. That longer lever changes what the click scale means. For this reason, ControlTech bodies make sense here, since Snap-on builds in a factor for head length. A CTECH1J240A covers 1-20 ft-lb, which suits many small flare joints. For a QC2I75 or QD2IN100A, ask Lost in HCM how to adjust the setting.
Care for a ratcheting flare head
Blow out the ratchet with dry air after work on oily lines. Then check that the slot edges stay smooth, because a burr can mark copper. Store the head clean and dry.
Sourcing the Snap-on RTWH52JSL flare nut head
SMK Vietnam shows this head as a partner listing, and Lost in HCM supplies and quotes it. Include your body model and the fitting spec in the message. Then ask Lost in HCM for an RTWH52JSL quote. Neighboring sizes sit in our torque wrench heads and adaptors section, and you can contact SMK Vietnam with questions.
RTWH52JSL: quick answers
Is the RTWH52JSL right for a -6 face seal nut?
Often yes, because many -6 face seal nuts measure 13/16 in. Still, check your hose maker’s data.
Which J ratcheting size comes next?
The 7/8 in head, which is also the largest ratcheting size Snap-on makes in J shank.
Does Snap-on publish a torque limit for it?
Not in its catalog table. So ask Lost in HCM to check before you work near the top of a body.
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