Garden

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The regular bolts may be a little stronger than shear pins. The previous owner may have had them shear off often so opted for the bolts to make them last longer. Get some of the original shear pins to get back the manufactures specs for safety.

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A shear pin is different from a regular bolt because it is designed to break, or “shear,” which in this case is a good thing. Shear pins are made with a weak point that snaps if a jam occurs between the auger and the housing.
Can I use a grade 8 bolt to replace the shear pin? No. Damage to the unit will occur if a higher grade bolt is used in place of the original.
A straight pin that will fail (break) when a certain load or stress is exceeded. The purpose of the pin is to protect equipment from damage due to excessive loads or stresses.
Shear bolts are designed to fail under a specific amount of force, whereas regular bolts are not. Shear bolts are typically made from a weaker material than regular bolts so that they will fail before the object they are holding together does.
Silver 5/16″ shear bolts are the most durable and are used on professional-grade snowblowers.
Grade 8 bolts exhibit greater tensile, yield, and shear strength as well as greater fatigue resistance and, just as important, are capable of greater torque specs and therefore much greater pre-load and clamping strength.
Titanium is the perfect metal for shear pins. Like platinum and gold, titanium is an element near the top of the galvanic scale and its resistance to corrosion of all kinds is legendary, reducing the cost of corrosion-related maintenance and replacement to zero.
The pin will break if the blade contacts a hard object during the mowing process. The force that causes the shear pin to break is prevented from being transferred to the blade spindle, and the deck shell, where the results of impact damage can damage spindle bearings and crack the deck shell.
The accuracy of a shear pin design`s rated torque, for example, is typically in the range of ±20 percent, while the rated torque accuracy of a ball detent torque limiter is in the range of ±5 percent.
Brass 1/4″ shear bolts are most commonly used on smaller, entry-level snowblowers. Black 5/16″ shear bolts are for larger mid-grade snowblowers. Silver 5/16″ shear bolts are the most durable and are used on professional-grade snowblowers.

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