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#1683467 - 11/24/09 05:28 PM What Grade Bolt For A Bush Hog "Shear Pin"?
pharmer Offline

Registered: 03/03/03
Posts: 68
Loc: NW Tn.
I have an older Bush Hog rotary mower that doesn't have a clutch. Ran over a stump today & it sheared the PTO pin that goes into the Bush Hog gear box. Did what it was designed to do. Can't find a factory pin as my mower is over 30 yrs. old. Bush Hog dealer tells me to use a 3 inch long, three-eighths diameter bolt with a lock-nut. One dealer says to use a Grade 2 bolt, other dealer says to use a Grade 5 bolt. I don't want to damage my tractor's PTO so I'm inclined to go with the weaker Grade 2 Bolt. Any suggestions or advice? Thanx!

#1683484 - 11/24/09 05:41 PM Re: What Grade Bolt For A Bush Hog "Shear Pin"? [Re: pharmer]
MGregoir Offline

Registered: 08/30/07
Posts: 1784
Loc: Bonnyville, AB
I would go with a grade 2. I think they each said a grade in reference to not being grade 8 more than anything.

#1683549 - 11/24/09 06:26 PM Re: What Grade Bolt For A Bush Hog "Shear Pin"? [Re: MGregoir]
HM12460 Offline

Registered: 05/26/07
Posts: 1655
Loc: West Michigan
grade 2 bolts are generally accepted to be the norm for shear pins.
2003 Dodge Dakota

#1683555 - 11/24/09 06:30 PM Re: What Grade Bolt For A Bush Hog "Shear Pin"? [Re: HM12460]
pharmer Offline

Registered: 03/03/03
Posts: 68
Loc: NW Tn.
MGregoir & HM12460, Thanks to both of you for your quick responses. I definitely will be buying Grade 2 bolts to use as "shear pins". Thanks again.

#1683580 - 11/24/09 06:42 PM Re: What Grade Bolt For A Bush Hog "Shear Pin"? [Re: pharmer]
wwillson Offline


Registered: 08/20/03
Posts: 1687
Loc: Naperville, IL
+1 on the grade 2. I grew up chopping about everything you could think of with Bush Hog mowers - brush, corn stalks, gopher mounds, etc. The mowers are much tougher than the PTO of the tractor, especially if it's a 540rpm. You want the weakest link to be that shear bolt. I'll bet the grade 2 will be in there for years, or until you hit your next stump.

Fastener strength table


Edited by wwillson (11/24/09 06:49 PM)
Edit Reason: added link to table