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 Indicators, they
save time in shop set-up and other inspection jobs.
For use with all Starrett Test, 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 Indicator Holder With Swivel Post Assembly Features:
A. No. 657P Magnetic Base is 1-15/16" x 1-5/8" 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 |
Above, No. 657A. Top inset: No. 657A with No. 711LS Last Word Dial Test Indicator
setting up workpiece on a surface grinder. Bottom inset: No. 657A shown with
No. 196B1 Universal Dial Test Indicator setting up workpiece on a milling machine.
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