Bach 12C Large Shank
TromboneIn Production
Precision Specifications
RIM DIAMETER24.5 mm
CUP DEPTHMedium
THROAT ∅—
BACKBORE#402
SHANKlarge shank
CUP SHAPEbowl
Rim Width—
Rim Contour—
Throat Drill #—
Material—
Finish—
Weight—
Recommended For
ClassicalAll Around
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Reference Notes
Bach 12C Large Shank appears in the Trombone catalog section with 24.5 mm rim, Medium cup, #402 backbore, and large shank shank. Database tags list it for Classical and All Around use. Use these measurements as a comparison starting point: fit and response still depend on the player, dental structure, instrument receiver, and each manufacturer's measuring method.
Brand Deep Dive
Bach · BrassFit Science
Bach Mouthpiece Guide
Decode the Bach number–letter naming system, cup depth spectrum, and Big Three models.