657AA Magnetic Base Indicator Holder

For use with all Starrett Test, Back-Plunger, AGD, Dial and Miniature Dial Indicators. Also

accommodates similar indicators of other manufacturers.

A.  657P Magnetic Base. 1-15/16 x 1-5/8 x 1-7/8” (50 x 40 x 48mm). Push-button on/off switch

for one-hand operation. Base has three precision ground magnetic contact points. Grips

horizontally, vertically, and upside down. V-step holds base to arbors, shafts, etc. Base has

extra 1/4-20 tapped hole on one side for mounting post. Black wrinkle finish on non-working

surfaces.

B.   657G Upright Base Post. 3/8” (9.5mm) diameter x 7-7/16” (190mm) length overall. Starrett

57S and 58S Universal Snugs may also be used.

C.657S Snug. Two 1/4” (6.3mm) diameter holes. Adapts 196, 650, and 651 Series Dial Indicators

and 657Y Indicator Attachment to 657X Rod.

D. 657X Rod. 1/4” (6.3mm) diameter x 6” (150mm) long. Accommodates Starrett 708, 709, 811

and 711F Series Dial Test Indicators and 657S Sleeve.

E. 657Y Indicator Attachment. 1/4" (6.3mm) O.D. one end, other end threaded and fits lug

backs of all AGD indicators (Starrett Series 81, 25, 655, 656) and Series 80 Miniature Indicators.

F. PT18724 Snug 3/8” (9.5mm) diameter post hole. 1/4” (6.3mm) diameter gripping hole

accommodates 657X Rod.

657AA Magnetic Base Indicator Holder-Complete Set

Description

Catalog No.

EDP

Magnetic Base with All Attachments – A, B, C, D, E, F

657AA

52743

Base and Post Assembly with 650B1 Indicator, 657S

Snug, and 3 Contact Points

657-650Z

65259

657AA Magnetic Base Indicator Holder – Individual Components

Photo Key

Description

Catalog No.

EDP

A

Magnetic Base Only

657P

52757

B

7-7/16” Upright Base Post Only

657G

52753

C

Snug with Two 1/4" (6.3 mm) Holes

657S

52759

D

Rod

657X

52764

E

Indicator Attachment

657Y

52765

F

Snug Complete-1/4” and 3/8” Holes

PT18724

50710