191 ER Series

The 191 ER Series fits most lathes and multi-spindle screw machines.

Range of specifications include:

  • 5/16-28 to 5/8-18
  • M8 x 1.25 to M16 x 2.0
  • Work Face: .7872

Download Our Brochure

View 191 ER Series size specifications for both Metric ISO Threads and Unified Threads in the tables below. For all sizes, .6L, 1L and 2L are available.

ER 191 Series Metric ISO Threads Unified Threads
Size Size
M 8 x 1.25 5/16-18
M 8 x 1 5/16-24
M 8 x 0.75 5/16-28
M 9 x 1.25 3/8-16
M 9 x 1 3/8-24
M 10 x 1.5 7/16-14
M 10 x 1.25 7/16-16
M 11 x 1.5 7/16-20
M 12 x 1.75 1/2-13
M 12 x 1.5 1/2-16
M 12 x 1.25 1/2-18
M 13 x 1.5 1/2-20
M 14 x 2 9/16-12
M 14 x 1.5 9/16-14
M 15 x 1.5 9/16-16
M 16 x 2 9/16-18
M 16 x 1.25 5/8-11
5/8-12
5/8-16
5/8-18