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RE: Grade 8 bolt properties

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Property Class (PC) 8.8 are typically metric sized bolts, whilst grade 8 are
typically imperial sized bolts (UNC,UNF), and from memory grade 8 have
slightly higher material strength.

Also whilst less than universally accepted, to some a screw is fully
threaded and has no plain shank, whilst a bolt has a plain shank. So if
using screws the thread has to be included in the shear plane.

Conrad Harrison
B.Tech (mfg & mech), MIIE, gradTIEAust
South Australia

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