Granite surface plates have virtually replaced the cast iron plates which were used before World War II because of price and maintenance costs, corrosion (rust) resistance, superior accuracy, less response to temperature changes, no humping when damaged by a severe blow, warp resistance, non-seizing surface, and non-magnetic.

Because of granite's lower coefficient of thermal expansion, granite will respond less than cast iron (steel) to temperature changes, which may distort the accuracy of the surface plate.

PRECISION GRANITE SURFACE PLATES are made of black granite which is stronger and denser than light colored granite, more stable, and wears longer. The granite properties determine the stiffness of the granite and accuracies can be guaranteed with less thickness than other types of granite. This translates to less freight and handling whenever the plate is shipped or moved. Our standard sizes are on our price lists for your convenience. We have capabilities to manufacturer almost any size requested. Just contact us with your specifications for a quotation.

Requirements as laid down in Federal Specification GGG-P-463c are the foundation of our production of surface plates. Typically we stock 0-ledge, 2-ledge, 4-ledge in standard sizes and grades. Please see our price lists for stock items, sizes, accuracies. Products shown on our price lists can usually ship in less than a week.

AA

 

Laboratory Grade:

For high precision operations in temperature controlled gauging rooms and metrology departments

A

 

Inspection Grade

For general quality control use

B

 

Toolroom Grade:

For shop work and production checking

Plates with ledges are for work clamping purposes only

The thickness of each PRECISION GRANITE plate is calculated at 50 lbs. or better per square foot loading per Federal Specification GGG-P-463c. If higher or lower loading conditions are required, PRECISION GRANITE can adjust the surface plate thickness to meet your needs.

The repeat measurement specification limits variations in the surface of the plate, providing greater measurement accuracy. All PRECISION GRANITE plates are manufactured to meet or exceed repeat measurement tolerances specified by Federal Specification GGG-P-463c.

A PRECISION GRANITE ?Calibration Certificate? is included with every surface plate guaranteeing overall surface flatness and repeat gage measurements. PRECISION GRANITE two accuracy certification is traceable to N.I.S.T. in accordance with our ISO 9001 certified quality system.
Long-form certification is available.

Handling Plates
When mounting the plate on a stand, be sure that the 3 markings on the plate bottom correspond to the 3 points on the stand. Do not support the plate by the ledges or under its four corners. Forklift: use protective padding between the metal forks and the granite.

Keep those plates clean and protect your surface plate accuracy!

Our Surface Plate Covers are made of vinyl; red and durable on the outside, soft on the inside. Prices are on our Surface Plate price list.

PRECISION GRANITE Surface Plate Cleaner is a PROTECTIVE CLEANER for your granite products.

It is exclusively made and packaged for PRECISION GRANITE . ▪ Sold in cases of 12 one pint containers and economically in cases of 4 one gallon cans.
Order using Article # P-5396 or by contacting us at: 562/696-8328 Fax 562/946-4336 Email:

For a printable version of our MSDS , please click on the bottle.


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0-LEDGE RECOMMENDED FOR ECONOMY & STABILITY SURFACE PLATE COVERS PROTECTIVE GRANITE CLEANER 2-LEDGE GRANITE SURFACE PLATE FOR CLAMPING 4-LEDGE GRANITE SURFACE PLATE FOR CLAMPING Click here for Material Safety Data Sheet (MSDS)