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Starrett Magnetic Base for Indicators
made in USA

Test indicators and dial indicators need some form of support in order to be useful. The magnetic base is indispensable in many situations. The magnetic base attaches soundly to metallic surfaces allowing you to use your indicator with confidence. There are a large variety of mag bases on the market, from cheap Chinese no-brand to costly Swiss Interapid. In between you will find the popular Noga, the ever-evolving Mitutoyo and the stalwart Starrett shown on this page.

Starrett657AAMagneticBaseAt at time when many of us are lamenting the loss of jobs overseas, it would only make sense to support some of our own industries. Starrett is one such company that still manufactures many of its products in America. Owning and using one of these Starrett magnetic bases can give you a sense of pride knowing that you helped keep fellow Americans in business.

  • This American made magnetic base is compatible with Starrett test, back-plunger, dial, AGD, and miniature-dial indicators, as well as similar indicators from other manufacturers such as Mitutoyo, Brown & Sharpe, etc. (and even low cost Chinese indicators).
  • Includes magnetic base, upright base post, two snugs, rod, and indicator attachment but you will have to buy the indicator separately.
  • Push-button on/off switch for one-handed operation.
  • Grips horizontally, vertically, and upside down for versatility.
  • Upright base post has overall length of 7-7/16" length, with an adjustable 6" long rod.
  • Replacement parts and accessories are available (see below).

Click for current pricing and stock: Starrett 657AA Magnetic Base

Magnetic Base Description

Starrett 657AA Magnetic Base indicator holder is an all-inclusive kit for use with all Starrett test, back-plunger, dial, AGD, and miniature-dial indicators, as well as similar indicators from other manufacturers. The set includes a Starrett 657P magnetic base, a 657G upright base post, a 657S snug, a 657X rod, a 657Y indicator attachment, and a PT18724 snug, all of which are also available as replacement parts.

  • The 657P magnetic base is 1-15/16” x 1-5/8” x 1-7/8” (50 x 40 x 48 mm) and has a push-button on/off switch for one-handed operation.
  • The base has three precision-ground, magnetic contact points to grip horizontally, vertically, and upside-down. The V-step holds the base to arbors, shafts, and other cylindrical items.
  • The base has an additional 1/4-20 tapped hole on one side for mounting the post.
  • The magnetic base has a non-skid, black wrinkle finish on all non-working surfaces.
  • The base post is 3/8” (9.5 mm) in diameter and 7-7/16” (190 mm) long.
  • The Starrett 57S and 58S snugs may also be used with this post (sold separately).
  • The 657S snug has two 1/4” (6.3-mm) diameter holes and adapts the 196, 650, and 651 series dial indicators and the 657Y indicator attachment to the 657X rod. The 657X rod is 1/4” (6.3 mm) in diameter and 6” (150 mm) long.
  • It accommodates the Starrett 708, 709, 811, and 711F series dial test indicators.
  • The 657Y indicator attachment has a 1/4” (6.3-mm) outer diameter hole on one end, while the other end is threaded to fit the backs of all AGD indicators (Starrett series 81, 25, 655, and 656) and series 80 miniature indicators.
  • The PT18724 snug has a 3/8” (9.5 mm) diameter post hole and a 1/4” (6.3-mm) diameter gripping hole to accommodate the 657X rod.

(product description provided by the manufacturer)

What’s in the Box

  • No. 657P Magnetic Base (also available separately, see below)
  • No. 657G Upright Base Post
  • No. 657S Snug
  • No. 657X Rod
  • No. 657Y Indicator Attachment
  • No. PT18724 Snug

ScreenShot20170311at11734PMStarrett 657P magnetic base only, with push button on and off switch. No posts or other attachments are included. This would be a good starting point if you intend to construct a custom mag base stand. This item is part of the complete set 657AA.

order replacement part 657P

Starrett657GStarrett 657G upright post with 3/8" diameter and 7-7/16" length for magnetic base 657P. This item is part of the complete set 657AA.

order replacement part 657G

Starrett657sThe Starrett 657S snug has two 1/4" (6.3 mm) holes to adapt Starrett 196, 650, and 651 series dial indicators and 657Y indicator attachment for use with the Starrett 657X rod (not included). A knurled thumb screw provides secure grip when making adjustments. This item is part of the complete set 657AA.

order replacement part 657S

Starrett657XStarrett 657X horizontal rod with 1/4" diameter and 6" length. This item is part of the complete set 657AA.

order replacement part 657X

Starrett657Y1The Starrett 657Y indicator attachment is designed to attach a lug back indicator to an indicator holder. The attachment has one 1/4" (6.3mm) outer diameter end and one threaded end and fits the lug back of all American Gage Design (AGD) indicators (Starrett series 25, 81, 655, and 656) and Starrett series 80 miniature indicators. This item is part of the complete set 657AA.

order replacement part 657Y

StarrettPT2Starrett PT18718 snug for dial indicators has 3/32-1/4" holding capacity with 5/16" diameter. Ideal for Starrett back-plunger indicator Model 196. This item is part of the complete set 657AA.

order replacement part PT18718

The following items are optional and not included with set 657AA

ScreenShot20170311at12325PM1Starrett 57S Universal Snug for surface gauges, indicators and accessories. This item is optional and not included with set 657AA.

  • 5/16", 3/8" Spindle hole diameters
  • 9/64", 5/32", 3/16", 1/4" Gripping hole diameters
  • Convenient attachment of scribers and test indicator shanks to surface gauges, magnetic bases, indicator tool post holders and gauge rods
  • Starrett No. 57 surface gages and test indicator clamps and post holders

order optional part 57S18

ScreenShot20170311at13031PMStarrett 58S Universal Snug. This item is optional and not included with set 657AA.

  • Spindle hole diameters 1/4", 5/16", 3/8" (6.3, 8, 9.5mm)
  • Gripping hole diameters from 3/32-1/4"used on holders with smaller clamp hole

order optional part 58S



Craftsman 8 Pc Screwdriver Set, Phillips & Slotted, Made In USA
 

A complete selection of essential repair and assembly tools is shown on page 31.



 

 

from our bookshelf

The Companion Reference Book on Dial and Test Indicators … page 178
BesTest and TesaTast Indicator Repair Manual … page 177
Starrett 711 Last Word Indicator Repair Manual … page 199
Interapid Indicator Repair Manual … page 208
Compac Test Indicator Repair Manual ... page 194
 

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14 Sarah Drive — Hauppauge NY 11788 — USA


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This page's most recent revision: 12 MARCH 2017
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Original photographs and content copyright 2017 by JWGrum

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