Group 27 Arms are wound with a minimum 38 series winds per pole of AWG #27 Gauge (0.0141-0.0143”) Copper wire. The minumum stack length is 0.440” (11.18mm) and are tagged '27'. These armatures are used for Group 27, Group 27 Light and in some Drag motor applications. All manufacturers offer Group 27 Armatures with various timings.