Bolts & screws
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From Wikipedia...that well known font of all knowledge...
There is no universally accepted distinction between a screw and a bolt. The Machinery's Handbook describes the distinction as follows:
A bolt is an externally threaded fastener designed for insertion through holes in assembled parts, and is normally intended to be tightened or released by torquing a nut. A screw is an externally threaded fastener capable of being inserted into holes in assembled parts, of mating with a preformed internal thread or forming its own thread, and of being tightened or released by torquing the head. An externally threaded fastener which is prevented from being turned during assembly and which can be tightened or released only by torquing a nut is a bolt. (Example: round head bolts, track bolts, plow bolts.) An externally threaded fastener that has thread form which prohibits assembly with a nut having a straight thread of multiple pitch length is a screw. (Example: wood screws, tapping screws.)
A bolt is an externally threaded fastener designed for insertion through holes in assembled parts, and is normally intended to be tightened or released by torquing a nut. A screw is an externally threaded fastener capable of being inserted into holes in assembled parts, of mating with a preformed internal thread or forming its own thread, and of being tightened or released by torquing the head. An externally threaded fastener which is prevented from being turned during assembly and which can be tightened or released only by torquing a nut is a bolt. (Example: round head bolts, track bolts, plow bolts.) An externally threaded fastener that has thread form which prohibits assembly with a nut having a straight thread of multiple pitch length is a screw. (Example: wood screws, tapping screws.)
My understanding of aviation fasteners is a bolt has a plain shank between the threaded part and the head and a screw is threaded all the way.
The difference is that a bolt can take tensile and shear loads (on the plain shank) and a screw can only take tensile loads.
So bolts hold stressed parts together and screws only hold un-stressed parts together.
hope this helps.
The difference is that a bolt can take tensile and shear loads (on the plain shank) and a screw can only take tensile loads.
So bolts hold stressed parts together and screws only hold un-stressed parts together.
hope this helps.
I'll go with dixi. It's what we were taught many years ago.
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Bolts & Fasteners
Besides the above mentioned differences between bolts and screws, bolts are used where more strength is required. To tighten a bolt, you turn the nut, whereas on a screw you turn the screw head. Screws have more threaded portions than a bolt.
Some books say that screws are below 5 mm and bolts above 5mm in diameter.
Cheers easaman
Some books say that screws are below 5 mm and bolts above 5mm in diameter.
Cheers easaman
You use a screwdriver on screws and a spanner on bolts - simples:-)
However I always found it interesting that the HS125 manuals consistently called bolts "screws". "Fasten the attachment screws and install split pins." I likened it to my fellow US mechanic's penchant for calling engines "motors" or pilots calling jet fuel "gas". And it's definitely more fun to do when someone objects!
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Bolts are defined as headed fasteners having external threads that meet an exacting, uniform bolt thread specification such that they can accept a nontapered nut.
Screws are defined as headed, externally-threaded fasteners that do not meet the above definition of bolts.
according to ASME
Screws are defined as headed, externally-threaded fasteners that do not meet the above definition of bolts.
according to ASME
Pilots' Pal
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Concur with plain shank and full thread notion; 'twas what we woz taught during apprenticeship. (Mind you, when I started my apprenticeship, Mr. Whitworth had only just retired).
Just another erk
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A bolt is a externally threaded fastener designed for insertion through holes in assembled parts, and is normally intended to be tightened or released by torquing a nut.
A screw is an externally threaded fastener capable of being inserted into holes in assembled parts, and mating with a preformed internal thread or forming its own thread and of being tightened and released by torquing the head.
also most bolts have a flat head, where screws have a point.
A screw is an externally threaded fastener capable of being inserted into holes in assembled parts, and mating with a preformed internal thread or forming its own thread and of being tightened and released by torquing the head.
also most bolts have a flat head, where screws have a point.
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perrin
Ah, sorry to change track but good story. When I started working in Scotland at Scottish Avaition at Prestwick coming from the USA (ex USAF) they said I would have to get not only a set of Witworth but BSF along with my AF tools.
Did so, many many years later working for BRAL at Glasgow I became a hero because I had the spanners to change the brake contol valve on the much loved ATP. Ah those where the days.
Keep them up boys
Peter
Did so, many many years later working for BRAL at Glasgow I became a hero because I had the spanners to change the brake contol valve on the much loved ATP. Ah those where the days.
Keep them up boys
Peter
For F**K sake....
If it has a nominal length its a Bolt....no nominal length....SCREW.
END OF STORY...GET BACK TO WORK!!
Screws.....Yet another stupid thread along the lines of opening a can of oil....100+ threads on opening a can of Oil?? I ask you.....WTF??
Come on guys....stop acting like twats eh??
YOUR SUPPOSED TO BE PROFESSIONAL.....ACT LIKE IT
Pilots read this crap.....lets at least look intelligent?
If it has a nominal length its a Bolt....no nominal length....SCREW.
END OF STORY...GET BACK TO WORK!!
Screws.....Yet another stupid thread along the lines of opening a can of oil....100+ threads on opening a can of Oil?? I ask you.....WTF??
Come on guys....stop acting like twats eh??
YOUR SUPPOSED TO BE PROFESSIONAL.....ACT LIKE IT
Pilots read this crap.....lets at least look intelligent?
Bravo!
