The granite used in a granite surface plate is graded by quality with these four levels of quality.
Granite surface plate grade b.
Tool room grade b laboratory grade aa x 4.
Or equivalent national or international organization complies with ansi ncsl z540 1and iso 10012.
B this is a toolroom grade granite surface.
A this is an inspection grade granite surface.
For standard sized surface plates we guarantee flatness tolerances that exceed the requirements of this specification.
In addition to flatness asme b89 3 7 2013 federal specification ggg p 463c address topics including.
Surface plates come in grades of a aa b and ht200 for different applications.
12 long x 12 wide x 4 thick granite inspection surface plate b toolroom grade 0 0002 unilateral tolerance includes nist traceability certificate msc 86433026 starrett 80607.
Weight 4 7 out of 5 stars 119 114 95.
Standridge calibration certificate is included with every surface plate guaranteeing overall flatness and repeat gage measurements.
Use grade aa laboratory plates for precision operations in constant temperature gaging rooms and metrology departments.
For general use in quality control areas b toolroom grade.
Hhip 4401 1812 black granite surface plate grade a ledge 0 18 length x 12 width x 3 height 000050 accuracy 80 lb.
Surface plates come in grades of a aa b and ht200 for different applications.
Grades of granite to consider when looking at a granite surface plate for sale.
For shop work and production checking.
Use grade aa laboratory plates for precision operations in constant temperature gaging rooms and metrology departments.
Aa this is a laboratory grade granite surface.
The granite surface plates that we offer are manufactured to meet or exceed the tolerances specified by federal specification ggg p 463c.
Repeat measurement accuracy material properties of surface plate granites.
A calibration certificate is included with every surface plate guaranteeing overall surface flatness and repeat gage measurements and is traceable to n i s t.