Standard Series, Small Shank
Yamaha
Model No.		 Approximate
Size Equivalent
45A Bach 12E
45C2-12C Bach 12C
46B Bach 11C rim, shallower cup
46C2 Bach 11C
47 Bach 6-3/4C, Schilke 47
48A Bach 6-1/2 rim, shallower cup
48 Bach 6-1/2AL, Denis Wick 6BS
48D Bach 6-1/2AL rim, deeper cup
51B Bach 5G, shallower cup, Schilke 51B
51 Bach 5G
51C4 Bach 5G, slightly shallower cup
51D Bach 5G, deeper cup
52 Between Bach 5G & 3G
Standard Series, Large Shank
Yamaha
Model No.		 Approximate
Size Equivalent
47 Bach 6-3/4C, Schilke 47
48 Bach 6-1/2AL, Denis Wick 6BL
48D Bach 6-1/2AL rim, deeper cup
51B Bach 5G, shallower cup, Schilke 51B
51 Bach 5G
51C4 Bach 5G, slightly shallower cup
51D Bach 5G, deeper cup
52 Between Bach 5G & 3G
53 Bach 3G, Denis Wick 4AL
GP Series, Small Shank
Yamaha
Model No.		 Approximate
Size Equivalent
45C2-12C Bach 12C
48 Bach 6-1/2AL, Denis Wick 6BS
GP Series, Large Shank
Yamaha
Model No.		 Approximate
Size Equivalent
48 Bach 6-1/2AL, Denis Wick 6BL
Standard Series, Bass Trombone
Yamaha
Model No.		 Approximate
Size Equivalent
58 Bach 2G
59 Bach 1-1/2G, Denis Wick 2AL
60B For German style bass trombones
60 Bach 1G, Schilke 60
GP Series, Bass Trombone
Yamaha
Model No.		 Approximate
Size Equivalent
59 Bach 1-1/2G, Denis Wick 2AL