Mitutoyo Steel Rectangular Gage Block, ASME Grade AS-1, 3.0 mm Length

It came with a certificate and in Mitutoyo packaging box. Wrapped in the usual anti corrosive paper inside a plastic bag. Slightly oiled. High accuracy stands to the Mitutoyo name. Both sides are mirror shining finish. Amazing and astonishing quality.

These gage blocks are great. I use them to check my mics, calipers, and height gage. Only the nominal length is calibrated. Grade AS-1 means that they are calibrated to plus or minus 0.2 microns. The rule of thumb is to use a gage block calibrated to a level 10 times more accurate than the tool you will use it to check. In this case, Grade AS-1 is sufficient to check my micrometer with a resolution of 0.002mm. NIST has a nice gage block handbook available for download http://www.nist.gov/calibrations/upload/mono180.pdf

Great Value!

Was expecting non measuring faces to be nominal 30.0mm x 9.0mm as in the description and in the Mitutoyo catalog. My thickness measured 8.9mm rather than 9.0. Disappointing from a company like Mitutoyo.

I bought the 30mm x 9mm x 3mm block expecting that I would be able check the accuracy of my Mitutoyo calipers (500-196-30). The 3mm side of it was spot on ... exactly 3.00 mm. But the 30 and 9 sides of this block were off ... 29.94 and 8.88. Apparently only the 3mm side is what is inspected and the block is actually lasered with a "3". So I'm not sure if the of the other sides of the block are suppose to be 30.00 and 9.00 exactly or if my calipers are off.

Guys, read teh dimensions before buying. I wished someone would post what the critical measured dimension was. We wanted to measure 30mm but the calibrated dimension was 9mm side....very disappointing/confusing.

The size the correct except the I can’t calibrate my gages well with it.

Exactly as described.

Très bon article et livraison très rapide