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.
Regards
Conrad Harrison
B.Tech (mfg & mech), MIIE, gradTIEAust
mailto:sch.tectonic@bigpond.com
Adelaide
South Australia
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