Magnetic Base Indicator Holder
No. 657AA
For use with all Starrett Test, AGD, Dial and Miniature-Dial Indicators. Also accommodates similar indicators of other manufacturers.
A. No. 657P Magnetic Base
1-15/16 x 1-5/8 x 1-7/8" (50 x 40 x 48 mm). 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.
B. No. 657G Upright Base Post
3/8" (9.5 mm) diameter x 7-7/16" (190 mm) length overall. Starrett No. 57S and No. 58S Universal Snugs may also be used.
C. No. 657S Snug
Two 1/4" (6.3 mm) diameter holes. Adapts Starrett No. 196 Series , Nos. 650 & 651 Series Dial Test Indicators
(below), No. 657Y Indicator Attachment and No. 657X Rod.
D. No. 657X Rod
1/4" (6.3 mm) diameter x 6" (150 mm) long. Accommodates Starrett Nos. 708 & 709 Series , No.811 Series and
No. 711F Dial Test Indicators and No. 657S Sleeve.
E. No. 657Y Indicator Attachment
1/4" (6.3 mm) O.D. one end, other end threaded and fits lug backs of all AGD indicators (Starrett Series Nos. 81, 25, 655, 656) and Series No. 80 Miniature Indicators.
F. No. PT18724 Snug
3/8" (9.5 mm) diameter post hole. 1/4" (6.3 mm) diameter gripping hole accommodates No. 657X Rod.
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Top: No. 657AA. Bottom Left: No. 657AA with No. 711 FS Last Word Dial Test Indicator. Bottom right: Shown with No. 196B1 Universal Dial Test Indicator.
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