Coach bolts, carriage bolts, coach screws etc.
On 26/09/2017 13:28, Dave Plowman (News) wrote:
In article , Graeme wrote: In message , Huge writes On 2017-09-26, Graeme wrote: Why is a machine screw called a screw when it is a bolt? Because it isn't a bolt. OK. I have always assumed that anything with a parallel shaft or thread is a bolt, but anything with a tapered shaft and thread is a screw, but apparently not. Huge's definition is certainly the one I remember - a bolt isn't threaded all the way. But just when a machine screw becomes just a screw I dunno. A bolt is a screw if screwed into something rather than having a nut attached. Bolt probably comes from the same root as a bolt for the door. It locates the two parts due to being a good fit before being tightened. |
Coach bolts, carriage bolts, coach screws etc.
In article ,
Richard wrote: Huge's definition is certainly the one I remember - a bolt isn't threaded all the way. But just when a machine screw becomes just a screw I dunno. A bolt is a screw if screwed into something rather than having a nut attached. Not so - an obvious example being car cylinder head bolts. Which screw into the block in most cases. -- *If horrific means to make horrible, does terrific mean to make terrible? Dave Plowman London SW To e-mail, change noise into sound. |
Coach bolts, carriage bolts, coach screws etc.
On 27/09/17 06:51, Richard wrote:
On 26/09/2017 13:28, Dave Plowman (News) wrote: In article , Â*Â*Â* Graeme wrote: In message , Huge writes On 2017-09-26, Graeme wrote: Why is a machine screw called a screw when it is a bolt? Because it isn't a bolt. OK.Â* I have always assumed that anything with a parallel shaft or thread is a bolt, but anything with a tapered shaft and thread is a screw, but apparently not. Huge's definition is certainly the one I remember - a bolt isn't threaded all the way. But just when a machine screw becomes just a screw I dunno. A bolt is a screw if screwed into something rather than having a nut attached. No, it isn't. A bolt is a part threaded machine screw, A machine screw is designed to attach into a pre threaded hole, possibly in a nut. Both have constant diameter and thread. A Woodscrew is self cutting and so are self tappers for metal sheet and plastic. -- €œIt is hard to imagine a more stupid decision or more dangerous way of making decisions than by putting those decisions in the hands of people who pay no price for being wrong.€ Thomas Sowell |
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