Bolt hole fit and effect on shear capacity

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SUMMARY

The discussion centers on the effect of bolt hole fit on shear capacity, specifically using a 3/8-inch un-threaded bolt as a pin to secure a sprocket hub to a drive shaft. It concludes that a looser fit, such as a .025 thousandths clearance, does not reduce the bolt's shear capacity. Instead, the bolt will slip under load and bear against the hole, allowing it to achieve its full shear capacity.

PREREQUISITES
  • Understanding of shear capacity in mechanical engineering
  • Knowledge of bolt specifications, particularly un-threaded sections
  • Familiarity with drilling and reaming techniques
  • Basic principles of load distribution in mechanical assemblies
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  • Research the mechanics of shear force in bolted connections
  • Explore the effects of different bolt hole fits on mechanical performance
  • Learn about the standards for bolt specifications and tolerances
  • Investigate methods for measuring and ensuring proper fit in mechanical assemblies
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Mechanical engineers, design engineers, and anyone involved in the assembly or analysis of bolted connections in machinery.

hovercraft57
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If I use the un-threaded section of a 3/8th inch bolt as a pin to lock a sprocket hub to a drive shaft I would drill and ream so that the bolt would need to be lightly tapped to go through the assembly.

If the fit was looser (.025 thousands clearance) would that reduce the capacity of the bolt to resist shear?
Thanks ED
 
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No, as the bolt will slip under a load and up bearing against the hole to obtain it's full capacity in shear.
 

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