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| Starrett >> Precision Tools >> Indicators and Gages |
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| No.
657A Series Magnetic Base Indicator Holder with swivel post assembly No. 657A The swivel post assembly on these holders provides universal adjustment in both horizontal and vertical planes. Available with Inch or Millimeter Starrett Dial Test or Back-Plunger Indicators, they save time in shop set-up and other inspection jobs. For use with all Starrett Test, Back-Plunger, AGD, Dial and Miniature-Dial Indicators. Also accommodates 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 side of base for indicator mounting post. Three precision ground magnetic contact surfaces (plus V-step). Black wrinkle finish on non-working surfaces. Magnetic Base Assembly Features: A. No. 657P Magnetic Base is 1 15/16" x1 5/8" x 1 7/8" (50 x 40 x 48 mm) deep B. Ball Joint Tensioning Cap. Slot permits 90° post travel to horizontal position C. Post rotates 360° D. No. 657F Indicator Swivel Post Assembly is 6 1/2" (165 mm) high (less threaded end). Assembly consists of items B, C, E, F, G E. Fine-Adjusting Screw. Turn to zero set indicator F. Upper arm is 2" (50 mm) long with a 5/16" (8 mm) dia. and swings more than 180°; friction joint holds it in position G. 7/32" (5.5 mm) dia. step, 1/2" (13 mm) long
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