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STRAIGHT ACCESSORY JAWS
Straight jaws (sometimes referred to as outside extension jaws) are perhaps the most useful of
 the gage block accessories.  These jaws allow gage blocks to be used to check INSIDE
 measuring instruments such as I.D. micrometers and calipers.  These accessories extend the
 outside measuring surfaces of the gage blocks beyond the gage blocks themselves to form
 internal measuring surfaces with approximately  the same tolerance as the gage blocks
 between the straight jaws.
Note:  The size of the straight jaw does not enter into its use.   That is why the tolerances for
 these jaws, ±24µin. or ±0.60µm, are so large.    The important tolerance is the flatness of the
 jaw so that its surface may be extended beyond the gage blocks with equal precision.

The manufacturing tolerances used at Webber Gage are much tighter than those allowed in
 specifications.  Webber manufacturing tolerances are ±10µin. or  ±0.25µm for size, and 5µin.
 (0.13µm) for flatnesss and parallelism.  For B89.1.9 specification, click here.
Available As:
Rectangular Style
Square Style
Heavy-Duty Style
RA 4       .250 in. Thick  (steel)
RA 24     .250 in. Thick (croblox®)

RA 104    5.0mm Thick  (steel)
SA 3       .500 in. Thick  (steel)


SA 103    12.0mm Thick  (steel)
HDA 820       1 in. Thick  (steel)
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©2008, Webber Gage Division, The L. S. Starrett Co, Cleveland, Ohio , 44145
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