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Bolt Strengths

  1. Jun 15, 2011 #1
  2. jcsd
  3. Jun 15, 2011 #2


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    Gold Member

    There is a big difference between safe working load and breaking strength, so you should check the numbers that you are comparing to see if they are equivalent.

    Those numbers change a lot as you change bolt grades, too. My brother manages a company that makes extruded plastic products, and he routinely has to source grade 8 and grade 9 bolts to mount the extrusion dies to the machinery. Between the high torques and the temperature extremes, these bolts can be very difficult to remove for die-changes, so high-grade bolts are a must. High-grade bolts are very expensive, but not as expensive as the production-loss involved in drilling out stripped bolts, purchasing new heads for the extrusion machines, installing helicoils, and other stop-gap solutions while waiting for new heads to arrive.
    Last edited: Jun 15, 2011
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