M38A1 CDN3 wheel nut question
 

The 1970 M38A1 has large wheel nuts that use a 13/16” wheel wrench rather than the common 3/4” wheel nut wrench used on WW2 jeeps and M38 and M38A1. But can someone check their CDN3 to see if all the nuts are Right hand thread on both sides of the vehicle. The parts book Supplement is unclear and I don’t have a CDN3 to inspect.

Brian, my CDN3 has 13/16" lug nuts that are all RH thread

Hi Brian,
If there is still any suspicion of being otherwise... mine is set up the same as Chris's.

All the best and hope to see you at Aquino!

Yep, all rh nuts on a Cdn3. The thing about left hand nuts on the left side self tightening turned out to be fiction.

Thanks to all for their observations. Interestingly the correct nut 5310-00-391-0687 is described as being "self-locking" and having an "all metal locking feature". I suspect the threads are slightly distorted to make them self-locking. The "all metal" feature means they are not to be "Nylock" or other non-metal locking feature. Look carefully at your original wheel nuts and see if you can see a dimpling or punch marks on the flat hole opening that indicate if the threads were distorted. ……….. Brian

I know the discussion is about M38A1 but another vehicle of the same vintage, my M135, had many self-locking nuts of the type shown below, BUT the wheel nuts were ordinary commercial items (no locking function). I don't recall ever having seen self locking wheel nuts. Maybe I'm not observant enough... Also some of the distorted lock nuts require significantly more torque to run down the bolt/stud compared to a regular nut (and more as they get larger).

When I look up that NSN, it comes up with a number of commercial numbers. Included in that is Kelsey Hayes X1023R, which is a fairly common civilian number. There is nothing self locking about those, aside from perhaps the 60° cone. Perhaps they consider that the locking feature.

The NSN was still valid for certain other equipment in Canada until 2017. The US list it as being for: ENGINE, AIRCRAFT T-64,F117A AIRCRAFT,SHIPBOARDMATERIAL HANDLING EQUIPMENT (MHE), INTEGRATED UNDERWATER SURVIELLANCE SYSTEMSAIRCRAFT, ORION P-3,AIRCRAFT, HAWKEYE E-2C