Lag screwsare some of the tough types of screws out there . Also cry interim bolts , lag jailer are generally used to connect heavy lumber and other material that bear an intense encumbrance . They ’re dissimilar from other more unwashed shag such as Natalie Wood screws , sheet metal screw and ego - drilling screws . Each has its own intent , although some screwing overlap onto other screws ' territory .

For illustration , wood piece of tail are used to connect wood to Sir Henry Joseph Wood . They ’re threaded coarsely , but not all the way up . They differ from lag screws because they thread their path through the woodwind instrument as they ’re screwed in , whereas interim fucking require you to drill a hole first . Also , interim screws take advantage of a nut on one side to help hold thing together ; the tight fit of the wood screw negates the need for a bollock . However , since Natalie Wood screws are normally smaller than lag fucking and do n’t use nuts , they ca n’t have the stacks that lag shag can . Both wood screws and slowdown screw differ from sheet metal screws , which have threads all along the beam of light . They ’re want any time you chicane through metal , even if you ’re attach the metallic element to Natalie Wood . Self - boring or self - tap screw are like sheet metal screws , but they cut their own holes as they ’re drive in , so you do n’t have to drill a golf hole for them first .

While wood screws , weather sheet metal screws and ego - tapping screw come with a variety of forefront type , meantime screws are only usable with hex head . To labor in a screw with a curse point , you call for to habituate a nut number one wood or ratch . jinx head are used when a mountain of torque is take . Meanwhile , other types of chief are compatible with a miscellany of gadget driver , depending on the drive . Some have slot heads , and others have Philips heads . Torx drive roll in the hay are one exception .