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Osmun Trumpet Backbore

Osmun Music
$59.95

Our backbores are designed to fit all cups with Warburton Style threads.  Models 1 and 2 are are our tightest backbores.  They are suited for Bb trumpets and Jazz, big band, and commercial work.  Numbers 10 thru 117 are progressively more open.  The number 24 with a 24 throat is widely used for C trumpet.  The 117 backbore is favored for piccolo.

The most important dimensions in a backbore are throat bore size and length, and the overall volume of the system.  The wider the throat the broader the sound. A longer throat makes the mouthpiece more stable at the expense of flexibility.  Backbores are listed by volume, from small to large.

Backbore Specifications
Model Taper  Taper Length  Volume, CC's
1 1.75 2.29 1.59
2 1.75 2.44 1.78
10 2 2.63 1.98
7 2 2.73 2.12
24 Parabolic 2.73 2.33
117 2.25 2.73 2.36

 

The overall length of the backbore is 2.79".  With a standard Osmun or Warburton top the overall mouthpiece length is 3.44".

The threads are .375-40, .250 long.

  • For clarities sake we use Vincent Bach's numbering system for our 10, 7, 24, and 117 backbores.  Since backbores are made with reamers each maker's are unique.
  • Backbores can be made in any variation of tapers and throats
  • We can thread your cup to fit our backbores or make your mouthpiece into a threaded backbore. 
  • Call 978 823-0580 or email us for details. 
  • Backbores with modified throats are non-returnable.

 

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Description

Our backbores are designed to fit all cups with Warburton Style threads.  Models 1 and 2 are are our tightest backbores.  They are suited for Bb trumpets and Jazz, big band, and commercial work.  Numbers 10 thru 117 are progressively more open.  The number 24 with a 24 throat is widely used for C trumpet.  The 117 backbore is favored for piccolo.

The most important dimensions in a backbore are throat bore size and length, and the overall volume of the system.  The wider the throat the broader the sound. A longer throat makes the mouthpiece more stable at the expense of flexibility.  Backbores are listed by volume, from small to large.

Backbore Specifications
Model Taper  Taper Length  Volume, CC's
1 1.75 2.29 1.59
2 1.75 2.44 1.78
10 2 2.63 1.98
7 2 2.73 2.12
24 Parabolic 2.73 2.33
117 2.25 2.73 2.36

 

The overall length of the backbore is 2.79".  With a standard Osmun or Warburton top the overall mouthpiece length is 3.44".

The threads are .375-40, .250 long.

  • For clarities sake we use Vincent Bach's numbering system for our 10, 7, 24, and 117 backbores.  Since backbores are made with reamers each maker's are unique.
  • Backbores can be made in any variation of tapers and throats
  • We can thread your cup to fit our backbores or make your mouthpiece into a threaded backbore. 
  • Call 978 823-0580 or email us for details. 
  • Backbores with modified throats are non-returnable.

 

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