Driveline bolt questions - 18mm

I have the Snap On 1/2 inch 12 point socket. I don't have anything with 18mm. But that is a sweet socket worth the money!

Socket, Impact, Heavy Duty Driveline, 1/2",12 pt., 1/2" drive

 

On what driveline are you encountering these bolts?
That snapon socket listed above is awesome..... for a dozen uses. Then it spreads and strips out the bolts. I love my snapon but that socket need to be tougher or chrome.

 

Bet I have had my warrantied at least three times in last five years. We have stuck to the tried and true 1810 series with the 12 point point 1/2" in our spec, but don't use direct drive trans and 2.28 crazy ratios. Are you talking about the new Meritor RPL350 series with the grooved companion yokes? Don't think they are standard spec.

 

Paccar has been pushing the meritor drivelines. Checked one out in the yard, didn't see a 18mm bolt??
The meritor diffs are interesting looking, gotta see how they compare to the spicers.

 

Does seem like Paccar is going to more Meritor driveline products. The new"Paccar" drive axles are meritor. They do look square and long, but should be easy to pull out of center section. Checked standard spec for 2017/2018 and it was still Spicer SPL250 series.

 

So I was rolling around under a new truck chasing down a vibration and what do ya know.... 18mm head on the strap bolts. Looks like the new SPL350 spicer driveshaft comes with them on the mainshaft. The interaxle still has the normal locking hardware. Seems to be enough room to get a standard socket on, worst case with a wobble extension. Bolts are listed as M14x1.25x25mm. 18mm 12 point head. The pic doesn't show the size but they are quite a bit beefier then the SPL250.
Truck is a heavy spec setup. RTLO20918b trans, 565hp cummins 2050ftlb.