Grade 5 Machine Screws Cross Recess Mushroom Head UNC Steel Bolts

The Grade 5 machine screws capability in yield (stretch) = 92,000 lbs / in2 x .03349 in2 = 3081 lbs minimum. Grade 5 machine screws capability in tension (failure) = 120,000 lbs / in2 x .03349 in2 = 4019 lbs minimum. You can see that the grade 5 will support almost 1/2-ton. Ever Hardware provides the custom-made grade 5 machine screws and bolts and customizable packaging.

Toughness is an important feature of a fastener. It is the opposite of brittleness and gives you an idea of how it will handle abuse without being damaged and eventually weakening the fastener or can cause fatigue to appear much earlier than normal. One way to “measure” toughness is by looking at the hardness rating of a fastener. The higher the number (Brinell, Rockwell …) the harder the material is, and the tougher it is to damage. According to Marks’ Standard Handbook for Mechanical Engineers, Grade 5’s typically has a core Rockwell hardness of C25-C34.
Far more than you will ever winch or pull on. Here is a quick point about fastener fatigue. Almost all fastener fatigue failures are the result of improper (almost always too low) torque. Too low a torque will cause the fastener to pick up more load more often and eventually cycle it to failure. Therefore, you want to make sure you torque your fasteners to the appropriate level using a torque wrench and make sure to torque dry, clean threads.

Heat treating is a group of industrial and metalworking processes used to alter the physical, and sometimes chemical, properties of a material. The most common application is metallurgical. Heat treatments are also used in the manufacture of many other materials, such as glass. Heat treatment involves the use of heating or chilling, normally to extreme temperatures, to achieve the desired result such as hardening or softening of a material.

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