Jacobs taper

Jacobs taper

[′jā·kəbz ′tā·pər]
(design engineering)
A machine tool used for mounting drill chucks in drilling machines.
References in periodicals archive ?
Included in this line are collet chucks, end mill adapters, shell and mill adapters, morse taper adapters, jacobs taper adapters, rigind tapping systems, tension compression tapping systems, and softblanks for CV40 and CV50 V-flange holders and BT30, BT40, and BT50 BT-flange holders.
These comprise any standard CNC collet chuck or endmill adaptor, or mounted in a VDI toolholder, other lathe tool block, or Jacobs Taper adaptor.
Mr Piper describes the HSK proposal as a "logical progression of technology" not unlike when CAT and NMTB tapers replaced the older Morse and Jacobs tapers which had replaced cylindrical shanks with clamp screws.