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 - The Niagra View Mobile - Powered by a 1959 Ford Tractor - by Mark Massey. In 1959 the Niagara Frontier Transit Inc. of Buffalo, New York designed and built six Viewmobiles for the Niagara Frontier Sightseeing Inc. for use as a sightseeing ride at the Niagara Falls State Park, Niagara Falls, New York, powered by a 1959 Ford 611 Tractor.
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