![]() ![]() So what I found was that there is no such thing as a graded "shear bolt". Additionally they could NOT identify what a Threaded 0.212 1.25 0.035298935 44,400 74,000 1,567īolt Technical That was my problem, everyone's "experience" kept giving meĮither conflicting information or they could not explain why there was a (diam): (len): area: capability: strength: Failure Non-threaded bolt actually has more shear force required than a gradeĨ threaded bolt (i.e. This is a difference of 1,241 lbs of shear force. So the SHEAR FORCE needed for a grade 8 threaded bolt is: 3,177 lbs. theĭiameter at the lowest point of the thread). So the SHEAR FORCE needed for a grade 8 bolt is: 4,418 lbs.Ī grade 8 bolt that is threaded has a diameter of 0.212 (i.e. The shear capability of a grade 8 bolt is: 90,000 ksi SHEAR CAPABILITY: This is calculated by using 60% of the tensil strengthįor a non-threaded grade 8 bolt the tensil strength is 150,000 pounds.Ī grade 8 bolt with the dimensions of 1/4 x 1 1/4 the surface area Shear force will be applied to cause failure. SURFACE AREA: This is the circumference of the bolt where the single What force would be required for this bolt to fail. In order for me to find out if I could get this locally I needed to determine Picture of a grade 8 bolt that was FULLY THREADED (i.e. In the case of my Kubota B2782 SnowBlower the dealer provided a Larger tolerances the item needed is a "bolt" and it is used in a way When referencing tractor implements that require Groves in a pin and this is used in walk behind snowblowers or lawn There is no such thing as a "shear bolt" when referencing graded bolts.Ī "shear bolt" is something that is created usually be cutting relief Even though the Kubota manual states:Ī grade 8 bolt must meet specific technical details in order to be identifiedģ) The head will have 6 lines denoting grade People that were supposed to be knowledgeable in this area and gotĪnswers like "a grade 8 shear bolt is softer metal", "a grade 8 shearīolt has stress lines" and "you should never use a grade 8 shear boltĪs it will wreck your machine". ![]() My search for a proper shear bolt to replace the one that broke.įirstly, THERE IS NO SUCH THING AS A GRADE 8 SHEAR BOLT! I asked Tried a bolt I found in myĬollection and limped along and finished clearing the sleet. Stage 2 fan and I did not have another one. Happened, I broke the shear bolt that connects the stage 1 auger to the The second stage so it would not be over worked. RPM up to 2,400 and drove slowly to not force too much sleet into Took out my Kubota B2710 with front mounted B2782 SnowBlowerĪnd proceeded to clear the driveway. When you walked on it you did notĮven compress it and leave footprints. Tried to use my ATV with a plow and it could not even bite into the sleetĪnd ended up going up on top of it. Other day and I went out to shovel it and it was very heavy. Snow that melts to rain and refreezes before it falls to the ground) the We had a snow storm that dropped about 3 inches of heavy sleet (i.e. The technical details you can scan down to BOLT FINDINGS.įirst a little description of what led to me to discover all this information. If you don't want to read what led to discover the shear bolt data youĬan scan down to TECHNICAL DETAILS. So I am providingĪll details and references so you don't have to believe me you can I know this is a long post but I am a believer in not trusting anyoneīecause they posted something on the internet. ![]()
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