Extension Sleeve / Extension Socket

  • Conforming to IS:6682-1972
  • Used to fit tapered shank tools onto smaller or larger tapered spindles
  • Manufactured from case hardening steel
  • Duly hardened and tempered to 55-58 HRC
  • Concentricity within 0.015mm
  • Precision ground internally and externall for close fit and firm clamp
Extension Sleeve / Extension Socket
Extension Sleeve / Extension Socket


Case Hardening Steel



What is a Morse Taper?

A morse taper is a form of a shallow taper which is self-locking in nature and is thus used to interlock two components having complementary tapers. Once the male taper is pushed into the female cone the wedging action of the angle and the frictional forces hold the two pieces together.  Many engineering tools including drill sleeves, extension sockets, arbors and revolving centres utilize the concept of morse tapers to mount them on machine spindles, tailstocks or other components. 

Using an extension sleeve

Extension sleeves are used to mount tapered shank components onto smaller or larger tapered machine spindles. The sleeves are also used to increase the reach of the tool. The sleeve consists of a male taper and a female taper both precision ground to ensure a close fit and a firm clamp. The male taper is clamped into the spindle's female taper whereas the female taper of the sleeve envelopes around the component's tapered shank.

Dismounting the components


The extension sleeves are provided with a slot on their bodies and a tang on the ends of their male taper. In order to detach the components:

  • Insert a drill drift into the slot such that it's sloping edge is in contact with the top edge of the component inside the sleeve.
  • Tap the end of the drift with a hammer.
  • As the drift enters further into the slot, the inserted component gets pushed out of the sleeve.

C.No External Morse Taper Internal Morse Taper  action
ESH-MT11 1 1
ESH-MT12 1 2
ESH-MT21 2 1
ESH-MT22 2 2
ESH-MT23 2 3
ESH-MT24 2 4
ESH-MT31 3 1
ESH-MT32 3 2
ESH-MT33 3 3
ESH-MT34 3 4
ESH-MT35 3 5
ESH-MT41 4 1
ESH-MT42 4 2
ESH-MT43 4 3
ESH-MT44 4 4
ESH-MT45 4 5
ESH-MT51 5 1
ESH-MT52 5 2
ESH-MT53 5 3
ESH-MT54 5 4
ESH-MT55 5 5
ESH-MT56 5 6
ESH-MT62 6 2
ESH-MT63 6 3
ESH-MT64 6 4
ESH-MT65 6 5