Lag Bolt = Lag Screw
wood screw thread + bolt head
shear & withdrawal loads
Distinction
wood screw - screwdriver or screw gun, not pre-drilled
lag screw - wrench, pre-drilled (two sizes)
bolt - narrow connection with both sides exposed
lab screw - deep connection and/or only one side exposed
Manufacturing
similar to bolts
no national standard for mechanical properties (bending yield strength should be in design specification)
smaller sizes have higher bending yield strength
Dimensions
NDS table L2