Hhip 4401 Granite Surface Plate Grade B Ledge 0

Hhip Grade A Granite Surface Plate 18x12x3 4401-1812

• Surface Plate is checked by an auto-collimator for Overall accuracy assurance
• Granite surface plates meet or exceed federal specifications ggg-p-463c
• Includes a Certificate of inspection
• Accuracy is +/-.000050 inch
• Measures 18″ Length by 12″ width by 3″ height

The top surface of this plate is precision ground to achieve a high degree of flatness and the accuracy is +/-.000050″. It is a Grade A (Grade 0) plate. Granite surface plates meet or exceed Federal Specifications GGG-P-463C and it includes a certificate of inspection. (Note that these are not NIST traceable.) Granite plates are used for measuring the flatness and squareness of other objects, laying out parts, calibrating instruments, setting up tools, checking parallelism and perpendicularity, and measuring heights with the use of a height gage. They are also used as a work surface for assembling, inspecting, and marking parts. Non-magnetic and non-conductive. Harder than steel and does not nick or burr. Surface plates are offered by HHIP in various sizes, with different levels of flatness and accuracy and are checked by an auto collimator for overall accuracy assurance.