Bore

Clarinet Bore Sizes
Please submit any clarinet bore (or other)  information you have to Steve
Bore sizes are commonly measured on the Upper Joint, exit bore (where it goes into the next joint).  But I’ve found this number is somewhat meaningless
when you want to compare instruments.  What is also important is the Entry
bore into the upper joint (and barrels entry and exit bores).  Thus many new numbers list a “upper” and a “lower” bore number which is simply the Upper
Joint Entry and Exit bore.  If there is one number listed then it is the Exit bore size.  Most numbers are in mm (millimeters) but there may also be numbers in the standard inch scale.  Example:  15.61 mm (.575″)

Make (pitch) Bore size [denotes calculated * or / 25.4
]

LeBlanc

Concerto (modern non-bridged keywork) Polycylindrical, 14.61 mm (.575″)
Concerto II (inverse taper barrel) Polycylindrical, 14.61 mm (.575″)
Opus II (inverse taper barrel) 14.61mm – .575″
Pete Fountaine 15.00mm (.590″)
Rapsodie (Intermediate) Polycylindrical, 14.60 mm (.575)
Sonata Polycylindrical, 14.60 mm (.575″)
Noblet 45 14.85 mm (.584″)
Noblet 40 14.85 mm (.584″)
Noblet SN#0718 – early 1900s .574
Noblet SN#2149 – pre WWII .580
Normandy 4 (Leblanc 4) 14.85 mm (.584″)
Leblanc 1176 (aka, double LL)
sn # 32869 (measured)
14.80  / [.5826″]  cylindrical
14.9 / .586
L-27 Symphonic 14.75  / [.5807″]  cylindrical
14.80  cylindrical
L-300 14.60 / [.5748″]
Symphonie (model 1142S)
Infinite .575″ / [14.605″]
Sonata .575″ / [14.605″]
Rapsodie .575 / [14.605″]
Symphonie II (measured) 14.64mm / [.576″]
Dynamic H 15.0 (.590″) / 15.0 (.590″)
cylindrical
176 (preceeded Symphonie / Classic model) 14.62 cylindrical
Classic 14.80
L7 14.67mm/ 0.577s” upper / 14.80mm/.583 lower
L27 14.75mm
L70
L200 – Leblancs R13 copy 14.83 top / 14.65mm lower
Classic 14.80
476
Selmer (Paris) Bore
St. Louis Bb (442) 14.5mm / .571″
Centered Tone  P15xx
CT (measured)
CT   N76xx
CT P15xx enhanced
Series 9 S00xx enhanced
15.0 (selmer documentation) [.590″]
14.95 / [.588″]
15.34 mm upper/ 15.10 mm lower
15.20 top / 14.89 lower
15.20 top / 14.89 lower (exact same as above CT enh)
Odyssee (442 pitch) 14.50mm / 0.571″
Artys (442 pitch) 14.50mm / 0.571″
Recital (440 or 442) 14.30mm / [.5629″]
Signature (440 or 442) 14.60mm / [.5748″]
10G
10S
Series 9* .577″ / [14.655]
Series 9 .588″ / [14.935]
Selmer 55 15.25″  .600mm top  / 14.64″
.5765mm bottom
Selmer USA Bore
Signet Omega .573″ / [14.554″]
Signet Soloist .573″ / [14.554″]
Signet Special .573″ / [14.554″]
Signet 100 .573″ / [14.554″]
Bundy/Vito (plastic) .590″ / [14.986″]
Signet Special sn# 74991 .590 = 15.00mm top / .575 = 13.83mm lower
Buffet Bore
Prestige RC 14.64mm / .5765″
E12 14.65mm
Polycylindrical
Prestige R13 14.64mm
Polycylindrical
Vintage R13 .570″
R13 14.64mm
Polycylindrical(.574″)
Festival
Jazz Festival .5835″ (measured top)
Tosca .573″
Super Dynaction (1968 – 1974)
BC-20   sn98xxx (1967) 14.83 top / 14.53 bottom
R13 (1974 – measured)
R13 (1994 – measured)
R-13  – sn# 51660 – 1955
R-13 – sn# 55156 – 1955
14.55
14.60
0.5845/14.84 top – 0.575/14.64 bottom
0.582/14.80 top – 0.477″/14.66mm bottom
E-11 (2757xx) 0.594″/15.05mm  top  – 0.5775″/14.68mm
bottom
Evette (K244xx) 0.577/14.65″ top – 0.572/14.54mm bottom
Evette Master Model – D40216 .0584/14.77 top – 0.575/14.64 bottom
Evette-Schaeffer – K24468 0.5695/14.46″ top – 0.569/14.46 bottom
1880s (no serial #) Buffet, wraparound register
vent
14.88mm/0.586″  top & bottom
1950 Buffet 14.84 top / 14.74 bottom
B12   sn#3109xx 15.00mm / .590″ top / 14.88 – .586″ bottom
Other Bore
Buescher True Tone (measured) .600″ / 15.5mm
Couesnon Monopole Conservatoire  sn 285xx 14.68 / 14.68 mm cylindrical
Peter Eaton International (measured) #1 .5925″

#2 .586 / 14.9mm bore

Peter Eaton Elite (measured) .601 – .6045″
Malerne Standard (measured) .577
Malerne Intermediate (measured) .5825
Artley 17S 0.590/14.99m top –  0.575″/14.61 mm bottom
Malerne silver throat (nickel silver bore
lining)
15.01mm/.591″ top – .582 mm/ 14.80″ bottom
Yamaha 34 15.13 top / 14.68 lower
Yamaha CS
Conn 424 15.45 mm top / 15.22 mm bottom.
interestingly there is no smooth bore flow from piece to piece on this
example:  barrel entry = 14.98, exit = 14.78.  upper joint entry =
15.45, exit = 15.22. Lower joint entry = 15.15
Boosey & Hawkes (thanks to Edward McLean)
Regent Sonorite (synthetic) Student model .593″ bore
Edgeware (wood & ebonite) Intermediate model,
advertised as the American model.
bore unknown
Emperor (wood) Intermediate model 4-20  .593″ bore
Imperial 926 (wood & ebonite) Professional model  .593″ bore
Imperial 1010 (wood) Symphonic model  .600″ bore
810 & 820 smaller than .593″
1010 Bb clarinet, circa 1935, sn# 315xx .600″ top / .599″ bottom
1010 A clarinet, circa 1935, sn# 315xx .598″ top / .598″ bottom