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Starrett Flexible Post Indicator Holders with magnetic base
No. 657T Series

For use with all Starrett Test, AGD, Dial, and Miniature Dial Indicators. Also accommodates similar indicators of other manufacturers. The flexible post is an assembly of short tubular steel sections and precision ball joints, linked by an internal steel cable. It can be adjusted to any position and locked by turning a lever near the magnetic base. This makes it possible to use indicators in awkward places that are hard to reach with conventional holding devices.

Assembled to the magnetic base, the post has a vertical reach of approximately 15" (380 mm) and a horizontal reach of approximately 10" (250 mm). The indicator snug on the end of the post can be rotated through 360° and locked in any position.

The base has three precision ground magnetic contact surfaces. Grips horizontally, vertically, or upside down. V-step holds base to arbors, shafts, chucks.

The No. 657W Attachment allows fine adjustments to be made, operated by turning the fine-adjusting thumb screw (with post locked in rigid position) to zero, then set the indicator.
A. Gage Rod 3/8" x 3" (9.5 mm x 75 mm) has 5/16, 1/4, and 7/32" (8, 6.3, and 5.5 mm) steps. Holds Nos. 708, 709, 711, and 811 Dial Test Indicators by body clamp.
B. Adjusting Take-Up Sleeve with locking nut for maintaining proper degree of post rigidity.
C. Post Snug has 3/8" (9.5 mm) hole (which will also grip AGD dial indicators by the stem).
D. Flexible Post No. 657U.
E. Locking Lever tightens internal steel cable to make post rigid and lock it in position.
F. Magnetic Base No. 657P has push-button on/off switch.

Top inset, No. 657B1 Test Indicator gripped directly to its stem via the post snug; middle, holding a No. 196B1 Test Indicator via a No. 657S Snug/Sleeve attached to the indicator's 1/4" (6.3 mm) diameter rod; bottom, No. 657W Fine-Adjustment Attachment.
Complete Assemblies
Part Number Description Page Price  
657T Magnetic Base with Flexible Post Assembly 428 $130.90
657TW Magnetic Base with Flexible Post Assembly and Fine-Adjustment Attachment 428 $153.85
Individual Components
Part Number Photo Key Description Page Price  
657P F Magnetic Base 428 $62.90
657U (D, E, C) Flexible Post with Locking Lever and Snug Only 428 $65.45
657W G Fine-Adjustment Attachment 428 $23.80
PT17850 A Indicator Holding Rod 428 $2.21

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