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test IndIcAtor snuGs And splIt

busHInGs usAGe GuIde
dove tAIl style snuGs: best prActIces for test
IndIcAtors And Holders
PT22428: 3/32-1/4" (2.4-6.3mm) inch hole on one side and standard female dove connection
on the other. For use with 708, 709 and 811 Test Indicators. Allows connection to 657AA, Test indicators are primarily used for testing
IndIca tors and GaGes round connectIon sunGs: unIversAl druM style snuGs: working as a machinist or toolmaker. They
or checking parts and for machine setups.
657A, 657T Magnetic Base and PT017762 Holding Rod for 252 Height Stand and PT11770A
They are a tool that is indispensable for
Tool Post Holder or 711-49 Height Gage Attachment.
are available in two types – plunger style
and the lever style. Both are versatile, but
657S: 1/4" hole on both ends
57S: 5/16" and 3/8" (8, 9.5mm) on one end
the lever style can be more adaptable to
and 9/64", 5/32", 3/16", 1/4" (3.5, 4, 4.8,
smaller, confined working areas.
PT18718: 3/32-1/4" hole on one end 5/16"
6.3mm) on the opposite
on the other
Unlike other indicators, the lever style's
NOTE: 3/8-1/4" bushings can be used with some of the snugs
PT18724: 3/32-1/4" hole on one end 3/8"
above to change 3/8"-1/4" where required (see PT00764)
a straight line. This can cause a slight
on the other
inaccuracy called "cosine error" if the
splIt busHInGs: contact moves in an arc rather than in
657H: 3/8" inch hole on both ends 657R: outside .312" (7.9mm), inside .250" angle of the lever to the workpiece is too
665D: 3/8" inch hole on one end .465" (6.3mm), length 1.000" (25.4mm) steep. If, for example, a lever was set off
(11.8mm) on the other. Includes 665L PT00764: .375" (9.5mm) outside, inside an additional 20º, there could be an error
(.375" bushing)
.250" (6.3mm), length 1/2" (12.7mm) of .0006" in a .010" range (0.012 mm in
PT16846 (not shown): 3/4" inch hole on both ends 80SB: outside .375" (9.5mm), inside .219" a 0.2mm range).
unIversAl style snuGs: (5.5mm), length 1/2" (12.7mm). Used to It is good practice, therefore, to keep
58S: 3/32-1/4" hole allows connection to increase the stem diameter on Starrett 80 your contact at or near 90º to the
1/4", 5/16", 3/8" (6.3, 8, 9.5mm) miniature indicators to standard .375" diameter. direction of movement.
25MSB: outside .375" (9.5mm), inside .316" Test indicators should always be "loaded"
(8mm), length 1/2" (12.7mm), converts metric 1/10 to 1/4 of a turn before measuring.
stemmed indicator to standard 3/8" diameter Test indicators are comparative instruments
665L: outside .465 (11.8mm), inside .375" that check and compare to known standards
(9.5mm), length 1-1/4" (31.5mm) or that are used to zero-out setups.
25SB: outside .500" (12.7mm), inside .375" We have a broad selection of holders
(9.5mm), length 1/2" (12.7mm) shown in this section that allow you to
use these indicators to the fullest. We've
never seen a job that one of these holders
combined with one of our test indicators
could not handle.

INCORRECT

657H PT22428 58S 657R PT16846

CORRECT

665D 657S 57S 665L
PT18718 For extreme accuracy we recommend
PT18724 positioning the lever contact so that it is
approximately 15º (708/709) or 0º (all
other lever styles) from being horizontal
with the workpiece

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