657A Starrett Magnetic Base Indicator Holder with swivel post assembly

657A
Starrett Magnetic Base Indicator Holder
with swivel post assembly

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 . 657P Magnetic Base is 1-15/16" x 1-5/8" x 1-7/8" (50 x 40 x
  48mm) deep .
• B . Swivel Cap Slot permits 90º post travel to horizontal position .
• C . Post rotates 360º .
• D . 657F Indicator Swivel Post Assembly is 6-1/2" (165mm) 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" (50mm) long with a 5/16" (8 mm) diameter and
  swings more than 180º; friction joint holds it in position .
• G . 7/32" (5 .5mm) diameter step, 1/2" (13 mm) long .
• 
  657 Series Sets
  These sets have been put together for your
  ordering convenience, but you can mix and
  match other Starrett test or back-plunger
  indicators and attachments with the 657A
  Magnetic Base and Swivel Post Assembly to
  suit your needs .