Screw or bolt?
Screw or bolt?
(OP)
The thread404-132824 re. tapping screws set me thinking about screws and bolts. When is something a screw and when is it a bolt?
Machinery's Handbook (20th ed) defines a screw (amongst other edfinitions) as
'an externally threaded fastener......mating with an internal thread.... being tightened or released by torquing the head'
whilst a bolt is
'an externally threaded fastener.....tightened or released by torquing a nut'
Does this mean that the externally threaded fastener lying in the stores enjoys dual status until someone picks it up and fits it to either a tapped hole (making it a screw) or to a nut (making it a bolt. Or does it mean that until someone picks it up to use it, it is neither a screw nor a bolt?
Machinery's Handbook (20th ed) defines a screw (amongst other edfinitions) as
'an externally threaded fastener......mating with an internal thread.... being tightened or released by torquing the head'
whilst a bolt is
'an externally threaded fastener.....tightened or released by torquing a nut'
Does this mean that the externally threaded fastener lying in the stores enjoys dual status until someone picks it up and fits it to either a tapped hole (making it a screw) or to a nut (making it a bolt. Or does it mean that until someone picks it up to use it, it is neither a screw nor a bolt?





RE: Screw or bolt?
RE: Screw or bolt?
RE: Screw or bolt?
rmw
RE: Screw or bolt?
RE: Screw or bolt?
Let's end it now. Enough has been said.
RE: Screw or bolt?
RE: Screw or bolt?
This unfortunately is not the case either. Screws come in both full threaded and partial threaded shanks. Example being the NAS623 Pan head screw.
Wes C.
RE: Screw or bolt?
TTFN
RE: Screw or bolt?
RE: Screw or bolt?
This is a discussion about semantics and it varies by historical usage.
RE: Screw or bolt?
RE: Screw or bolt?
Length of Thread on Bolts:
"distance from the end of bolt to end of thread, varies depending on nominal length of bolt. Short bolts are threaded as screws."
Length of Thread on Screws:
"threaded to permit a ring gauge to be screwed up to the head within a distance not exceeding 2.5 x pitch (3.5 x pitch for > 25mm diameter)."
RE: Screw or bolt?