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IndIcAtor Holders

657A MAGnetIc bAse IndIcAtor Holder G F
WItH sWIvel post AsseMbly D
The swivel post assembly on these holders provides universal adjustment in both
horizontal and vertical planes. Available with inch or millimeter Dial Test or Back-Plunger
IndIca tors and GaGes accommodates similar indicators of other manufacturers. C E
Indicators, they save time in shop set-up and other inspection jobs.
For use with all Test, Back-Plunger, AGD, Dial and Miniature-Dial Indicators. Also

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: B
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). A
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" (8mm) diameter and swings more than
180º; friction joint holds it in position.
G. 7/32" (5.5mm) diameter step, 1/2" (13mm) long.

657A Magnetic Base Indicator Holder - Individual Components
Cat. No. EDP Description
657A 52744 Magnetic Base with Swivel Post Assembly
657P 52757 Magnetic Base Only
657F 52752 Swivel Post Assembly Only

657A with 196B1 Universal Dial 657A with 711LS Last Word
Indicator setting up workpiece Dial Test Indicator setting up
on milling machine. workpiece on surface grinder.
657 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.

657T Flex-O-Post Indicator Holders with magnetic base - Individual Components
Photo Key Cat. No. EDP Description
F 657P 52757 Magnetic Base Only
(A, B, C, D, E) 3657U 12695 Flex-O-Post with Locking Lever and Snug Only
G 657W 52763 Fine-Adjustment Attachment
A PT17850 72400 Indicator Holding Rod
657T Flex-O-Post Indicator Holders with magnetic base - Complete Assemblies 657C
Cat. No. EDP Description
657T 52760 Magnetic Base with Flex-O-Post Assembly 657B
657TW 52761 Magnetic Base with Flex-O-Post Assembly and Fine-Adjustment Attachment

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