Results 1 to 8 of 8
  1. #1
    Super Star Member
    Join Date
    Apr 2001
    Posts
    10,982
    Tractor
    NH TC25D

    Default Shear Bolt vs Regular Bolt

    I stopped at my local TSC to buy some 1/2 x 3" Grade 2 shear bolts for my Brush Bull rotary mower. They didn't have any and the salesman said, "All the guys are using regular bolts of the same size." So, I went over to the fastener section. They had Grade 8, Grade 5 and Steel bolts, according to the labels on the drawers. No Grade 2 bolts. Is it OK to replace a shear bolt with a regular Grade 2 bolt?

  2. #2
    Super Member RobS's Avatar
    Join Date
    Jun 2000
    Posts
    6,233
    Location
    SW Michigan
    Tractor
    John Deere 790

    Default Re: Shear Bolt vs Regular Bolt

    Mike, stick with the grade 2 even if you have to go elsewhere to find it. The higher grades will be tougher and may not shear when they need to. That could result in damage to your PTO driveline. As I recall, grade 2 will have NO markings on the head. The other grades will have various raised marks forged into the bolt heads. Hope this helps [img]/w3tcompact/icons/smile.gif[/img]

  3. #3
    Veteran Member
    Join Date
    Jan 2002
    Posts
    1,265
    Location
    Western Michigan
    Tractor
    NH TC33D w/R4 Tires, Rear Remote, Hydraulic Toplink, 2 Auxiliary Work Lights, 7308 Loader w/Kasco Uni-Hitch (Quick Tach)

    Default Re: Shear Bolt vs Regular Bolt

    This is out of my Bush Hog Rotary Cutter Manual.
    Attached Images Attached Images

  4. #4
    Super Star Member
    Join Date
    Apr 2001
    Posts
    10,982
    Tractor
    NH TC25D

    Default Re: Shear Bolt vs Regular Bolt

    Thanks, Spencer and Rob!

    Do either of you know if there is a difference between a Grade 2 bolt and a Grade 2 shear bolt?

  5. #5

    Default Re: Shear Bolt vs Regular Bolt

    <font color=blue>...if there is a difference between a Grade 2 bolt and a Grade 2 shear bolt? ...</font color=blue>

    Yep... the word shear...[img]/w3tcompact/icons/smile.gif[/img]

    Actually some "devoted" shear bolts will have a "groove" cast into the bolt...


  6. #6
    Super Star Member
    Join Date
    Apr 2001
    Posts
    10,982
    Tractor
    NH TC25D

    Default Re: Shear Bolt vs Regular Bolt

    The shear bolts on my snow blower have the groove, two of them I think.

    So, is it safe to replace a Grade 2 shear bolt with a Grade 2 regular bolt?

  7. #7

    Join Date
    Aug 2000
    Posts
    235
    Location
    Saratoga N.Y.
    Tractor
    Kubota 2710

    Default Re: Shear Bolt vs Regular Bolt

    On my snowblower there are 2 shear bolts for the auger and 1 for the fan. The shear bolts cost around $6 each, and I am always going thru them. I use the grade 2 bolts (which the original shear bolts were) and use my lathe to make the grooves in them. You could also make the grooves in them by chucking the bolt into a drill and then hold a file to the bolt areas that you want the grooves to be. (A dremel works even better to make the grooves). I make up 20 of them in the beginning of the snow season and they cost a few cents each vs $6. BTW I always add 2 to the number of hash marks on a bolt to get the grade. 3 hash marks on the bolt head is a grade 5, 0 hash marks on the head is a grade 2. I find that if you don't make the groves in the bolts they are harder to drive out of the shaft after they shear,[img]/w3tcompact/icons/sad.gif[/img] if you do have the grooves they just pop right out !![img]/w3tcompact/icons/smile.gif[/img] Hope this helps.

  8. #8
    New Member
    Join Date
    Jul 2013
    Posts
    6
    Location
    Aiken, SC
    Tractor
    John Deer 1000 series

    Default Re: Shear Bolt vs Regular Bolt

    Geez, this is an old thread but exactly what I am going through now. My neighbor picked up some bolts for at TSC and they keep breaking. When I bought my rotary cutter the original bolt lasted a long time even with an inexperienced operator, myself. I am going to the JD dealership to find out about the right bolt which is a Grade 2 and ordering it through them.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
© 2013 TractorByNet.com. TractorByNet is a registered trademark of IMC Digital Universe, Inc. Other trademarks on this page are the property of their respective owners.