STARRETT 18" x 18" x 4" Surface Plate / Model: G-80622

18” x 18” (450mm x 450mm) Crystal Pink® Granite Surface Plate with a 4” (100mm) thickness. Crystal Pink® Granite has the highest percentage of quartz of any granite for superb wear resistance. Grade A (Inspection Grade) for general work in quality control. .000100” (0.0025mm) Flatness unilateral tolerance. Produced without ledges.

Specifications

• Made in America: Yes
• Size LxWxT (in): 18 X 18 X 4
• Grade (U.S.): A Inspection
• Size LxWxT (mm): 450 X 450 X 100
• Ledges: No

• Meets or exceeds U.S. Federal Specification GGG-P-463c and ASME B89.3.7 2013 for flatness.
• Great surface hardness and wear resistance – the highest percentage of quartz crystals of any granite plate.
• Smooth, jewel-like quartz bearing points protect accuracy and finish of both the surface and the tools used on it.
• Quality and economy combined.
• Comparable to black granite plates while outwearing them as much as 5 to 1.
• Meets or exceeds 50 lb per square foot (24kg per 1,000 sq. cm) load bearing specifications. Available in 100 lb (45kg) test series.
• Standard-size plates are mounted on resilient support pads, providing isolation from normal vibration and a non-distorting 3-point suspension.
• Packed one per crate with skids for forklift handling.