RUKO Reduction Sleeve MK3 to MK2, DIN 228-A, Hardened Tool Steel

Machine spindles with Morse Taper 3 often cannot directly hold tools with Morse Taper 2 shanks. This reduction sleeve solves that mismatch by adapting MK3 spindles to accept MK2 tool shanks, enabling the use of smaller drills, reamers, and other tooling without changing the machine setup.

Who is it for

Machinists, toolmakers, and maintenance technicians who need to use MK2-shank tools in machines with MK3 spindles. Suitable for drilling, milling, and turning operations where precise tool alignment is critical.

Main features

• Outer taper: Morse Taper 3 (MK3) for secure fit in machine spindle
• Inner taper: Morse Taper 2 (MK2) to hold tool shank
• Manufactured to DIN 228-A standard for dimensional accuracy
• Made from high-grade tool steel, hardened and ground for wear resistance and precision
• Friction fit (taper lock) ensures concentricity and torque transmission

Specifications

• Product type: Reduction sleeve
• Outer taper: MK3
• Inner taper: MK2
• Material: High-grade tool steel
• Standard: DIN 228-A
• Overall length: 112 mm
• Outer taper large end diameter (D1): 24.07 mm
• Inner taper large end diameter (D1): 18.00 mm
• Outer taper small end diameter (D2): 19.05 mm
• Inner taper small end diameter (D2): 14.63 mm
• Precision: Ground and hardened
• Drive type: Friction fit (taper lock)

Tips

Ensure both tapers are clean and free of burrs before assembly. A light tap with a soft mallet may be needed to seat the sleeve, but avoid excessive force. For removal, use a proper drift key designed for Morse taper sleeves.