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Magnetic Base Indicator Holder
No. 657 AA

For use with all Starrett Test, AGD, Dial, and Miniature-Dial Indicators. Also accomodates similar indicators of other manufacturers.
Powerful, permanent magnetic base holds firmly to steel or iron surfaces - horizontally, vertically, upside-down. Push-button turns magnetic force on or off for quick, one-hand set-up and take-down. V-step adapts base to horizontal or vertical arbors and chucks. There is an extra 1/4-20 NC tapped hole in the side of the base for the indicator mounting post. Three precision ground magnetic contact surfaces (plus V-step). Black wrinkle finish on non-working surfaces.
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. 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 (Sleeve) Two 1/4" (6.3 mm) diameter holes. Adapts Nos. 196, 650, and 651 Series Dial Test Indicators (below) and No. 657Y Indicator Attachment to No. 657X Rod.
D. No. 657X Rod 1/4" (6.3 mm) diameter x 6" (150 mm) long. Accomodates Starrett Nos. 708, 709, 811 and 711F Series 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 accomodates No. 657X Rod.
Complete Set
Part Number Description Page Price  
657AA Magnetic base with all attachments -A, B, C, D, E, F 425 $90.10
657-650Z

Base and Post Assembly with No. 650B1 Indicator, No. PT18718 Snug, and 3 Contact Points

425 $255.85
Individual Components
Photo Key Part Number Description Page Price  
A 657P Magnetic Base Only 425 $62.90
B 657G Upright Base Post Only 425 $6.55
C 657S Snug (Sleeve) 425 $10.03
D 657X Rod 425 $3.06
E 657Y Indicator Attachment 425 $3.06
F PT18724 Snug Complete - 1/4" and 3/8" holes (Formerly No. 196L) 425 $9.61

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