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French Horn Screw Rim Specifications

Overview
Materials
* Available in silver or gold plated brass, black delrin, or clear acrylic plastic.
Threads
* 750 x 35 "Giardinelli"
* 800 x 36 "PHC" or "Metric"
Diameters
* 17 mm to 18.25 mm measured at .04 inches into the cup
Rim Width
* Range from XXN (3.5mm) to W (5 mm)

Giardinelli Screw Rims
Diameter of Giardinelli Rim Joint
* 16.5mm (.650 inches) for the 17mm to 17.75mm rims
* 17mm (.669 inches) for the 18mm rims
* 16.5mm joint diameter work best with most 750-36 threaded cups from Moosewood and other manufacturers, can also be used with larger cups with slight overhang
* 18 ID mm rims have a 17mm joint diameter
* Work best with Osmun wide cups and Moosewood BR and BW rims
Giardinelli Rim Height
* 0.11 inches or 2.79mm on the 750-36 rims

Metric/PHC Screw Rims
Diameter of Metric/PHC Rim Joint
* Varies slightly as the ID gets smaller
* 17.5mm (.689 inches) on the 18mm, 17.75mm, and 17.5mm rims to match PHC cups
* 0.666 inches for the smallest 17mm ID rims
* The smaller rims have a slight overhang, similar to PHC US1 and US2 rims
* This allows players to use a rim with a smaller ID on the larger PHC cups
Metric/PHC Rim Height
* 0.130 inches to correspond with the design of PHC rims