I would go with a grade 2. I think they each said a grade in reference to not being grade 8 more than anything. grade 2 bolts are generally accepted to be the norm for shear pins..
Considering this, what grade bolt is a shear pin?
Normally shear bolts are Grade 2 and there is no soft grade #5 as it is either a grade #5 or not.
Beside above, what grade should shear bolt for bush hog? grade 2 bolts are generally accepted to be the norm for shear pins.
In respect to this, what does a shear pin do?
A shear pin is a mechanical detail designed to allow a specific outcome to occur once a predetermined force is applied. It can either function as a safeguard designed to break to protect other parts, or as a conditional operator that will not allow a mechanical device to operate until the correct force is applied.
What is the shear strength of 1/2 bolt?
SAE Bolt Strength
| Bolt Safe Working Loads (lbs) (Safe tensile load at 6,000 psi load) (Safe shear strength at 7500 psi load) |
| BoltDia(in) | NF Thread Grade 2 Iron Bolt |
| 1/4 | 200 | 370 |
| 5/16 | 340 | 575 |
| 3/8 | 510 | 830 |
Related Question Answers
What is the difference between Grade 5 and Grade 8 bolts?
Grade 8 bolts have been hardened more than grade 5 bolts. Thus they are stronger and are used in demanding applications such as automotive suspensions. Grade 8 bolts have 6 evenly spaced radial lines on the head. Grade G is roughly equivalent to Grade 8.What are the different grades of bolts?
The most common grading system used for bolts in the U.S. is the SAE system, but you can find metric grading systems as well. There are several grades of bolts but the three common grades for SAE are 2, 5 and 8. The common class (grades) for metric are 5.8, 8.8, 10.9 and 12.9. Each grade has a specific bolt strength.How tight should shear pins be?
You want it tight enough to keep the2 parts from moving back and forth. But not so tight as to keep them from ever moving! Probably 20-30 ft-lb.What happens when a shear pin breaks?
Broken shear pin or bolt. The shear pin and bolt fasten the augers to their drive shaft. They're designed to break if your snow blower's auger hits a large rock or chunk of ice to protect the engine from damage. If the shear pin or bolt breaks, the auger is unable to turn.Why do shear pins break?
Shear pins. Notice the grooves in the pins where they will break off to prevent damage to your auger shaft and gear case. A shear pin (sometimes called a shear bolt) in a snow blower connects the auger to the shaft. It is designed to break away in case foreign objects come in contact with the moving parts.Do Single stage snow blowers have shear pins?
Shear Pins/Bolts - Installed on the auger shaft, a shear pin's purpose is to break when the auger gear case is being over-torqued. Shear pins are common replacement parts on two stage snow blowers. Single Stage - Snow blowers that collect and throw snow in one step.Why are shear pins made from high carbon steel?
Machinery such as farm equipment and packaging machines uses shear pins made from high carbon steel to prevent overload if something becomes jammed. High carbon steel is chosen as a material for use in shear pins because it is a strong metal so will fail at a much higher load but it is also brittle.What is a mechanical pin?
Mechanical Pins are devices used to hold to objects or materials together. They work by being inserted into a hole, which would prevent the movement of the objects to move perpendicular to the shaft of the mechanical pins.What are shear pins on a snowblower?
A shear pin (sometimes called a shear bolt) in a snow blower connects the auger to the shaft. It is designed to break away in case foreign objects come in contact with the moving parts.How do Bush Hog blades work?
There are two methods for sharpening bush hog blades that work equally well. To use an angle grinder, you hold the sharpener in your hands and pass it over the blade, which is clamped in place. To use a bench sharpener, you hold the blade against a stationary grinder. 
