Starrett 657AA Magnetic Base Indicator Holder Set

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. 57S and 58S Universal Snugs may also be used.
   
3. 657S Snug. Two 1/4″ (6.3mm) diameter holes. Adapts 196, 650, and 651 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 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 (81, 25, 655, 656) and 80 Miniature Indicators.
   
6. PT18724 Snug. 3/8″ (9.5mm) diameter post hole. 1/4″ (6.3mm) diameter gripping hole accommodates 657X Rod.

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