Filter by
Component
System of Measurement
Surface Plate Grade
Material
DFARS Specialty Metals
Export Control Classification Number (ECCN)
U.S.–Mexico–Canada Agreement (USMCA) Qualifying
Color
REACH
Squareness Tolerance
Sold As
Calibration Squares
 |  |
Tri-Squares | Squares |
Check the tool path of your CNC machine with the highest degree of precision. These calibration squares can lay flat to check that the X- and Y-axes of your tool path are at 90°. Or sit them up vertically to confirm the Z-axis is perpendicular. Made of Laboratory Grade AA granite, these squares have the tightest flatness tolerance available for granite. They also come with a calibration certificate traceable to NIST that states they've passed a test for accuracy. Moisture, coolant, and chips won't affect the granite, so they remain accurate even when used inside a milling machine. You can also use them to check the squareness and parallelism of finished workpieces.
They have drilled holes to reduce their weight and make them easy to position.
Tri-Squares—Tri-square plates have a face and two edges for checking 3-axis machines.
Squares—Square plates have two additional edges for checking both 3-axis and 5-axis machines.
Tolerance per 6" | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
No. of Finished Edges | No. of Finished Faces | Lg. | Wd. | Ht. | Flatness | Squareness | Parallel | Color | Material | Surface Plate Grade | Certificate Type | Each | |||
Tri-Squares | |||||||||||||||
| 3 | 1 | 12" | 9" | 3" | 0.00005" | 0.00005" | — | Black | Granite | Laboratory Grade AA | Calibration Certificate Traceable to NIST | 6177N11 | 000000000 | ||
Squares | |||||||||||||||
| 5 | 1 | 12" | 12" | 3" | 0.00005" | 0.00005" | 0.00005" | Black | Granite | Laboratory Grade AA | Calibration Certificate Traceable to NIST | 6177N12 | 00000000 | ||
Granite Inspection Setup Blocks
 |
Machined in pairs, these blocks are precision ground to tolerances thinner than a sheet of paper to give you the flattest and squarest surface for positioning workpieces. Since they are perfectly aligned to one another, they’ll keep your workpieces level and parallel. Also known as 1-2-3 blocks, they're typically used to elevate, support, and align parts for measuring and inspecting. They're made from granite, so they won’t scratch the surface of your workpiece. They also won’t warp when temperatures fluctuate. Unlike metal blocks, these granite blocks are nonmagnetic, so they won’t interfere with sensitive electronic equipment. They come with a certificate of accuracy that's traceable to NIST.
Laboratory-Grade AA Plate—Laboratory-grade AA blocks are best for precision inspections and quality-control work in calibration labs. These blocks have the tightest tolerance for the highest level of accuracy.
Tolerance | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Lg. | Wd. | Ht. | Lg. | Wd. | Ht. | Squareness | Parallel | Material | Certificate Type | Pair | |||
Sold as Matched Pair | |||||||||||||
Laboratory-Grade AA Plate | |||||||||||||
| 1" | 3" | 2" | -0.0001" to 0.0001" | -0.0001" to 0.0001" | -0.0001" to 0.0001" | 0.00005" | 0.00005" | Black Granite | Accuracy Certificate Traceable to NIST | 8140N101 | 000000000 | ||
