I have no idea. I just bought some shear bolts/pins from the hardware store and they seemed to fit fine. I will see if the auger is making contact with the ground causing them to break. Thanks
If you get the wrong ones they will either snap prematurely(best case scenario) or not snap in time to save your machine from damage. If you have any of the same shear bolts that keep breaking left, then take the good one out and move it to the side that breaks, then put the ones that keep breaking in the other side. If the old bolt now holds, and the new ones break when swapped to other side, then the trouble is the bolt.
BY all means...only get bolts/pins made for your machine. try this site for older NOMA parts....http://www.jackssmallengines.com/snow_noma.cfm
Red Max EB78001 blower
Echo PB1000 blower
Sears ? blower
Sears 16" chainsaw
John Deere STX38
Murray 21" push mower
Echo SRM1501 weed wacker
Excell/Honda pressure washer
Ariens 11528