657AA Starrett Magnetic Base with Attachments

657AA
Starrett Magnetic Base Indicator Holder

For use with all Starrett Test, Back-Plunger, AGD, Dial and Miniature-
Dial Indicators. Also accommodates similar indicators of other
manufacturers

1. 657P Magnetic Base. 1-15/16 x 1-5/8 x 1-7/8" (50 x 40 x
   48mm). Push-button on/off switch for one-hand operation.
   Base has three precision ground magnetic contact points. Grips
   horizontally, vertically, and upside down. V-step holds base to
   arbors, shafts, etc. Base has extra 1/4-20 tapped hole on one side
   for mounting post. Black wrinkle finish on non-working surfaces .
2. 657G Upright Base Post. 3/8" (9.5mm) diameter x 7-7/16"
   (190mm) length overall. Starrett 57S and 58S Universal Snugs
   may also be used.
3. 657S Snug. Two 1/4" (6.3mm) diameter holes. Adapts 196, 650,
   and 651 Series Dial Indicators and 657Y Indicator Attachment to
   657X Rod.
4. 657X Rod. 1/4" (6.3mm) diameter x 6" (150mm) long.
   Accommodates Starrett 708, 709, 811 and 711F Series Dial Test
   Indicators and 657S Sleeve.
5. 657Y Indicator Attachment. 1/4" (6.3mm) O.D. one end, other end
   threaded and fits lug backs of all AGD indicators (Starrett Series 81,
   25, 655, 656) and Series 80 Miniature Indicators.
6. PT18724 Snug 3/8" (9.5mm) diameter post hole. 1/4" (6.3mm)
   diameter gripping hole accommodates 657X Rod.