14

Imagine a 3D cylinder, like a can. Now imagine that almost like an axle spot for a wheel, there's a hole shaped in a perfect circle going down the cylinder. That's the shape I have to figure out the name for. Mathematical names are preferred, but any name works!

  • 10
    There's only 1D in cylinder. – Jim Reynolds Feb 24 '15 at 21:46
  • 8
    I think you call it a "pipe". (Well, actually, "cylinder" is the common term, unless it's exceptionally long.) – Hot Licks Feb 24 '15 at 22:24
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    So you mean basically like a very tall doughnut? – Janus Bahs Jacquet Feb 24 '15 at 22:37
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    Tube. Thick-wall or thin-wall. If cylinder is short enough, the holed variety might be called a washer. – Wayfaring Stranger Feb 25 '15 at 0:27
  • 4
    A man, a worm, and a straw are topolgically equivalent. – tchrist Feb 25 '15 at 4:12

11 Answers 11

36

A solid cylinder with an axial hole is still a cylinder. If the length of the cylinder is very much less than the diameter and the bore is small compared to the diameter it is a washer. If the length is much larger than the diameter, and especially if the bore is nearly as large as the cylinder diameter it is a tube.

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  • I think "washer" is only likely to be properly recognized in mechanical contexts, and may be especially misleading or inappropriate for some others. – Iszi Feb 24 '15 at 23:13
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    "washer" is used in mathematical contexts for integration of certain types of functions. – Random832 Feb 25 '15 at 3:38
  • True: I might say "like a washer" rather than describing it as a washer. – JDługosz Feb 25 '15 at 5:41
  • A cylinder with length < diameter is still a cylinder. – Gusdor Feb 25 '15 at 9:55
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    Yes,but if length << diameter it's also a washer. – WhatRoughBeast Feb 25 '15 at 20:26
16

Cylinder -Wiki

Open Cylinder

A cylinder -with the generating lines perpendicular to the bases, with its ends closed to form two circular surfaces- with a hole perpendicular to its base, is a right circular, open cylinder.
Its function tells us if it's a pipe, washer, bearing, beer can, ect.

Google's 4th picture hit for open cylinder:

enter image description here

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13

Colloquially, i'd just call it a hollow cylinder.

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  • 4
    Not just colloquially. Whenever this shape appears in physics, it's called a hollow cylinder. – Martin Krzywinski Feb 24 '15 at 23:32
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    If I read the phrase "hollow cylinder", I'd be wondering if it had end-caps or not. – David Richerby Feb 25 '15 at 18:20
  • … not to be confused with a foolish Dutchman. – J. C. Salomon Feb 25 '15 at 22:35
11

In technical terms, it seems that the three dimensional object would be called an annular cylinder:

A problem in generalized thermoelasticity for an infinitely long annular cylinder

Annulus is certainly a two-dimensional object in geometry describing one cross section of an open cylinder:

NOUN

technical

1 A ring-shaped object, structure, or region.

A barrel is also a common less technical reference for a bored cylinder:

A cylindrical tube forming part of an object such as a gun or a pen:

Tube, pipe and ring also offer less technical descriptions.


International Journal of Engineering Science Volume 26, Issue 3, 1988, Pages 301–306

www.oxforddictionaries.com

en.wikipedia.org

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  • 1
    Annulus appears to be 2D... – anemone Feb 24 '15 at 22:01
  • Though mathematically similar, an annulus is considered very flat (like a washer) or even 2D. Much of any depth to it and people wouldn't call it an annulus anymore. I don't have a good single word for what is desired but a 'cylinder with bored/rifled center'. – Mitch Feb 24 '15 at 22:01
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    As the other comments mention, an annulus is 2-dimensional; this object is an annular cylinder. – Nick Matteo Feb 25 '15 at 1:55
  • I recall encountering some writing by a non-native speaker that used annulus. That's unheard of in American English and I suggested ring for that particular use. – JDługosz Feb 25 '15 at 5:39
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    @jdlugosz: In technical mathematical writing, annulus is the recognized term for the 2-dimensional shape, partly because ring is used in mathematics for something completely different. – Nate Eldredge Feb 25 '15 at 6:08
7

I've always considered that a Toroid

http://en.wikipedia.org/wiki/Toroid

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  • 4
    "toroid" is a bit too vague. It is like calling a square a quadrilateral. – Umberto P. Feb 25 '15 at 20:59
  • 1
    You can call it a "rectangular toroid" to specify the shape of its cross section. – Muqo Feb 26 '15 at 15:34
4

Stealing from other answers as well.

  • Tube (if it's longer than it is wide)
  • Tunnel (if it's a tube big enough to crawl or drive through)
  • Pipe (if it's long and fixed in place)
  • Hose or Conduit (if it bends)
  • Ring or Disc or Washer (if it's shorter than it is wide)
  • Straw (if you drink through it)
  • Bucket (if it has a cover on one end)
  • Bottle (if it's a bucket with the open end narrower than the closed end)
  • Can or Canister or Capsule (if it has a cover on both ends)
  • Duct (if it has junctions)
  • Barrel (if you shoot projectiles through it, or it's made of compressed wood planks, or it's a canister big enough to store a person)
  • Toroid (if its ends meet)
  • Sleeve (if it's designed to snugly surround something)
  • Coil or Solenoid (if it's made by tightly winding material around a cylinder)
  • Bushing (if it has internal, inverse screw threading)
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2

In the UK Steel Industry it is referred to as a Hollow Bar

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1

In French, it would be called "un manchon". I found the following translations for this word: muff, sleave, bush(ing), socket. I don't know which one is the most appropriate.

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1
  • Tube
  • Ring
  • Pipe
  • Washer
  • Straw
  • Hollow cylinder
  • Cylindrical shell
  • Bored cylinder

Or, perhaps the most technical name for it:

  • Long round thing with a hole through it
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0

This is what I remember using in geometry class: "coaxial cylinders". Pipe is correct too. Disclaiming that the hole is not implied there. This question is very close to yours, check it out.

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0

It's called a tube - a hollow cylinder. E.g.; gun barrels are sometimes called metal tubes; plastic sewer pipes get addressed as tubes; and architects get the privilege to call tunnels tube-shaped structures.

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