I purchased this bolt to replace the crankshaft pulley bolt in a 2001 Toyota 4runner 5VZ-FE engine while the timing belt and water pump were being serviced . They're supposed to stretch, but I could probably do without replacing them. Mine didn't stretch even after being subjected to 217 ft-lbs of torque. This is part of ASIN and appears to be of high quality. A new bolt was found more than 500 miles away and I doubt this will be a problem.
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