ISO 4202:2016规定了带有莫氏锥柄（1号至6号）的工具的外部7/24锥度（30号、40号、45号、50号和60号）减速套筒的尺寸。 所有这些套筒都允许驱动具有莫氏锥柄的工具，该锥柄的小端有一个榫头；一些套筒允许驱动带有莫氏锥柄的工具，该锥柄上有一个轴向螺纹孔: -使用套筒30×1的组合螺钉？40 × 1?40 × 2?45 × 1?45 × 2?45 × 3?50 × 2?50 × 3?50 × 4?60 × 3?60 × 4?60 × 5; -使用30×1套管的拉杆？30 × 2?40 × 1?40 × 2?40 × 3?45 × 1?45 × 2?45 × 3?45 × 4?50 × 2?50 × 3?50 × 4?50 × 5?60 × 3?60 × 4?60 × 5?60 × 6. 莫尔斯锥度符合ISO 296，而7/24锥度符合ISO 297。

ISO 4202:2016 specifies the dimensions of reduction sleeves with external 7/24 taper (Nos. 30, 40, 45, 50 and 60) for tools with Morse taper shanks (Nos. 1 to 6). All these sleeves allow driving of tools having Morse taper shanks which have a tenon at the small end of the shank; some sleeves allow driving of tools having Morse taper shanks which have an axially tapped hole in the shank: - with the use of an incorporated screw for sleeves 30 × 1?40 × 1?40 × 2?45 × 1?45 × 2?45 × 3?50 × 2?50 × 3?50 × 4?60 × 3?60 × 4?60 × 5; - with the use of a draw bar for sleeves 30 × 1?30 × 2?40 × 1?40 × 2?40 × 3?45 × 1?45 × 2?45 × 3?45 × 4?50 × 2?50 × 3?50 × 4?50 × 5?60 × 3?60 × 4?60 × 5?60 × 6. Morse tapers conform to ISO 296 while 7/24 tapers are in accordance with ISO 297.