Scroll over to the LH side of the Home Page and look under RESEARCH & INFO for the TORQUE VALUE Chart listed and you will find all the info on how Bolt Heads are marked. THREE equal hash marks indicates GRADE 5. Works fine for a SHEAR BOLT. Use a 5/8-18 HEX HEAD shoulder bolt, lockwasher, and hex nut. A shoulder bolt has a partial non-threaded end under the head. Grade 2 is softer and also can work. Use on a brush hog or finish mower. Made to break away if obstruction is hit so you don't do damage to your gear box. Helps to also use with an ORC (Over Running Clutch). Bolt length only needs to be long enough to cover the washer and nut with 2 or 3 threads exposed. Longer does nothing. Brush hogging tip: always walk the area first to uncover any hidden objects that will obstruct damage gear box. Look for old stoves and fridges, cars, stumps, large rocks/boulders, Jimmy Hoffa, etc. Question is why are you breaking so many shear bolts???
5/8-18 X2-3/4 HEX HEAD BOLT, PARTIALLY THREADED (SHOUDLER) BOLT: https://www.mcmaster.com/products/screws/hex-head-screws~/medium-strength-grade-5-steel-hex-head-screws/thread-size~5-8-18/length~2-750/length~2-75/length~2-3-4/
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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