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Lug Back
for Compac, Mercer and Tesa dial indicators

 

Your large 58 mm diameter Swiss made Mercer, Compac or Tesa YR and Tesa YE dial indicator probably comes with a plastic flat back. Four large slotted screws hold it in place. If you buy the optional cast metal lug back, you simply remove the plastic back and screw on the metal lug back using the same four screws.

Compac and Mercer are identical because they're the same indicator, sold under two different brand names. Tesa uses many of the same parts. These metal backs will fit all Compac, Mercer, Tesa YR and Tesa YE indicators made in Switzerland. They will not fit the old Mercer indicators made in England.

Every manufacturer (Starrett, Teclock, Mitutoyo for example) has slightly different specs for their indicator backs. As a result, you will have to use the manufacturer's own. They are not interchangeable between manufacturers.

 

Mercer indicator with optional lug back installed. The flat back has been removed.

 

If you're not familiar with the difference between on-center and off-center lug backs, take a look at these diagrams. They speak words.

on-center (left) and off-center (right)

The hole in the lug is 6.4 mm which equals .25". The dimensions given are metric (in millimeters) and correspond to the large (Ø 58 mm) indicators shown above.

The smaller models, with 40 mm diameter bezels, such as Compac 353E have a correspondingly smaller back but still have the quarter inch hole. There is also another difference: The small indicators do not have removable plastic backs. The indicators have a solid case. The optional lug back mounts directly onto the case using fours screws (not included). When you buy the small model lug backs, you will also receive four screws for this purpose.

 

Compac, Mercer, Tesa YR and YE (but not water proof)

Order No.

2015 Price

Lug Back On-Center with 1/4" hole for all 58 mm Ø models

01460014

42.00

Lug Back Off-Center with 1/4" hole for all 58 mm Ø models

01460015

51.00

Metal Back with 8 mm fixed shank for all 58 mm Ø models

01460016

obsolete

Metal Back with M6 internal thread for all 58 mm Ø models

01460017

84.00 (*)

Set of 4 screws for the above backs (58 mm models)

041995

15.20

(*) while supply lasts

Compac, Mercer and Tesa (including water proof) (screws included)

Lug Back On-Center with 1/4" hole for all 40 mm Ø models

01460008

59.00

Lug Back Off-Center with 1/4" hole for all 40 mm Ø models

01460009

88.00


Brown & Sharpe TESA 16.39008SComparator Measuring Stand, 0-5.5" Range, 6"x4.3" Measuring Face, No Arm

 

Books by René Urs Meyer

The Companion Reference Book on Dial and Test Indicators … page 178
Repair Manual for Swiss-made BesTest and TesaTast Indicators … page 177
Starrett 711 Last Word Indicator Repair Manual … page 199
Interapid Indicator Repair Manual … page 208
 

www.longislandindicator.com

Long Island Indicator Service Inc
14 Sarah Drive — Hauppauge NY 11788 — USA


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This page's most recent revision: 14 JULY 2016
All Rights Reserved

Original photographs and content copyright 2016 by JWGrum

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