Detail 01
Alto sax sizing
Cut for alto mouthpiece dimensions. It will not seat correctly on tenor or soprano pieces.
Product detailSKU #1274115035141
YamahaYAC1645 Alto Sax Plastic Mouthpiece Cap
Independent shopping perspective
The Korena take
A plastic cap that covers the mouthpiece and reed on an alto sax. Replacement part for a lost or cracked cap.
Strong match
Who this is for
- Replacing a cap lost in a school band room
- Keeping a spare in the case so a reed never sits exposed
- Students who need a low-cost part, not an upgrade
Consider the trade-offs
When to look elsewhere
- Players wanting a metal cap for durability or looks
- Anyone needing a cap for tenor, soprano, or baritone sax
- Those looking for a ligature, which this is not
What matters in use
The specifications, translated
Catalog numbers tell only part of the story. These are the details most likely to change how this product feels, sounds, or fits into a setup.
Detail 02
Plastic construction
Light and quiet in the case, but will crack if stepped on or crushed under a lid.
Detail 03
Cap only
Covers the mouthpiece and reed. It does not hold the reed on, so a ligature is still required.
Detail 04
Yamaha YAC1645
Yamaha's own accessory part number, so it fits their mouthpieces without guesswork.
Final check
Know before you order
- 01No ligature or reed is included, this is the cap alone
- 02Fit varies with aftermarket mouthpieces, which are often thicker than stock
- 03Leave the reed on when capping, the cap protects the tip
Product questions
Before you decide
Straight answers to the questions shoppers most often ask about this product.
01Will this fit any alto sax mouthpiece?
It is made for alto dimensions and fits Yamaha mouthpieces directly. Larger aftermarket mouthpieces may sit too tight or too loose.
02Does the cap come with a ligature?
No. It is the cap only. You need a ligature separately to hold the reed.
03Can I use this on a clarinet?
No. Clarinet mouthpieces are much narrower than alto sax mouthpieces, so the cap will not hold.
04Should I put the cap on with the reed attached?
Yes. The cap is there to shield the reed tip and mouthpiece rails from knocks inside the case.
