Description
Once a tube nut reaches 1 in across flats, it usually sits on a serious hydraulic or process line. Those nuts take many turns, and a short swing makes a solid head slow. The Snap-on RTWH64Y flare nut head ratchets on a 1 in hex, so the fitter keeps the ring on the nut between strokes. It also uses the Y shank, which suits the higher values these joints carry.
Core facts on the RTWH64Y
- Size: 1 in, 12-point, ratcheting, open ring.
- Shank: Y (0.560 in), per the Lost in HCM listing.
- Snap-on’s catalog shows the 1 in Y ratcheting head as RTWH64YSL, with RTWHY heads at 4.43 in from pin to fastener center.
- Snap-on states that the range meets Boeing ST2599 specifications.
Where a 1 in hex shows up
On many 37-degree JIC systems, the -10 nut for 5/8 in tube measures 1 in. You will also find 1 in nuts on some large refrigerant, coolant and lube oil lines. In each case, measure the hex itself, because the tube and thread sizes do not tell you the nut size.
Why 1 in heads come only in Y
Snap-on’s J ratcheting range stops at 7/8 in. Above that, every ratcheting flare nut head moves to the Y shank. As a result, the Snap-on RTWH64Y flare nut head needs a Y body, such as these:
- CTECH2Y100A ControlTech, 5-100 ft-lb, with a built-in factor for head length.
- QD3IN200B dual range, 37-140 ft-lb.
- QC3P150 preset, 30-150 ft-lb, for a fixed value on repeat work.
Allowing for the longer reach
Standard QYRX flare heads sit 3.00 in from the pin, while RTWHY heads sit 4.43 in away. That adds 1.43 in of lever. Because of that, a click body set for a standard head will apply a different torque. The ControlTech body handles this through its head-length factor. For a QD or QC body, however, ask Lost in HCM or Snap-on for the right correction.
Solid 1 in alternatives
For fittings that need a firm, rated grip, Snap-on also lists solid 1 in heads. The QYRX32A (12-point) and QYRXS32A (6-point) both carry a 158 ft-lb rating on a Y shank. They also keep the standard 3.00 in spacing. So choose a solid head for high specs, and the ratchet for speed in tight spaces.
Getting the Snap-on RTWH64Y flare nut head
Lost in HCM supplies this head, and SMK Vietnam lists it for that partner. Tell Lost in HCM your Y body and the fitting value. Then request an RTWH64Y quote from Lost in HCM. For nearby sizes, open our torque wrench heads and adaptors page, or contact SMK Vietnam.
RTWH64Y questions and answers
Will the RTWH64Y fit a -10 JIC nut?
Usually, since many -10 JIC nuts measure 1 in. Still, confirm the hex on your fitting.
Is there a torque rating for this head?
Snap-on’s table lists none for ratcheting flare nut heads. So ask Lost in HCM before you set a high value.
What sizes sit either side of 1 in?
Snap-on lists 15/16 in below and 1-1/16 in above, both in Y shank.
Reviews
There are no reviews yet.