SURFACE PLATES


0-LEDGE


2-LEDGE


4-LEDGE

Plates with ledges are for work clamping purposes only.

AA

Laboratory Grade

High precision operations in temperature controlled gauging rooms and metrology departments

A

Inspection Grade

General quality control use

B

Toolroom Grade

Shop work and production checking

PRECISION GRANITE® SURFACE PLATES are manufactured to meet or exceed the 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, and is traceable to N.I.S.T. or equivalent National or International Organization, complies with, ANSI/NCSL Z540-1and ISO 10012 in accordance with our ISO 9001 certified quality system. Long-form certification is available. We are an accredited provider of 17025 Calibration Services.

PRECISION GRANITE® plates are made of black granite which is stronger and denser than light colored granite, and more stable. The granite properties determine the stiffness of the granite so 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.


STEEL STANDS

The Fed. Spec. GGG-P-463c recommends three fixed points to support the surface plate and minimize sag and warp. PRECISION GRANITE® plates are marked on the bottom of the plate to coincide with the supports on the top of the stand. When aligned with each other they uphold the accuracy of the plate. PRECISION GRANITE® standard stands are manufactured to support the weight of the surface plate plus 50 pounds per square foot load. Stands are made for each plate to meet a 36” working height unless specified otherwise.


SURFACE PLATE COVERS

Our Surface Plate Covers are made of vinyl; durable on the outside, soft on the inside.


PRECISION GRANITE® PROTECTIVE CLEANER

Penetrates the granite surface to loosen dirt, grime and residues. It leaves the surface clean, which cuts down wear on precision surfaces. Sold in pint size squeeze bottles.




COMPARATOR STAND

Granite surface plate base includes column & clamp with fine adjustment

Standard clamp with 1" dia. x 10" high column, approx. 2½" throat clearance measured from column to center line of the indicator stem.

Standard clamp accepts all lug back AGD indicators.

Special clamp with 1.365" dia. x 10" high column, approx. 4.75" throat clearance measured from column to center line of indicator stem.

Standard clamp accepts stem drop indicators. Other column lengths available.


TRI-SQUARE

One large face and two edges flat and square to each other with lightening holes Calibrates X,Y, Z axes on CNC machines, milling machines, coordinate measuring machines


MASTER SQUARE

One large face & four edges flat, square and parallel to each other with lightening holes All granite products available in custom sizes and thicknesses, with threaded inserts, without lightening holes


PARALLELS

2-Face finished on narrow edges4-Face finished on narrow and wide edges


STRAIGHT EDGE

Measured on center line of gauging surface- narrow edge


VEE BLOCKS

“V & Base”
90° Vee centered with and parallel to base
“Universal”
90° Vee centered with and parallel to bottom and two sides, and square to the ends


STEP BLOCK

Also called 1-2-3 Blocks sold individually or in pairs
6 faces finished flat, square, and parallel


RISER BLOCK

Six sides finished flat, square & parallel. Inserts and lightening holes available upon request


ANGLE PLATE

2-FACE Bottom and adjacent square face finished flat and square to each other
4-FACE Same as 2-face, with adjacent sides finished flat, square, and parallel


INSERTED ANGLE PLATE

These angle plates have metal discs located on both the main face and on one side for magnetizing purposes. Threaded inserts for clamping are located on the other main face


CUSTOM CASES

Designed for maximum protection of granite accessories. Dust & water resistant. Custom interior.


PEDESTALS AND LEVELING JACKS

For maximum support for large plates, pedestal and leveling jack systems are an economical solution. The granite pedestals are custom made to meet the required working height. The adjustable wedge jack between the pedestal and plate is used for leveling.




MACHINE BASES

PRECISION GRANITE® manufactures single granite machine bases, air bearing surfaces or multiple component precision assemblies to meet industry needs. Our capabilities range from custom lettering and logos, critical testing and checking surfaces, to coplanarity on multiple planes.


CUSTOM MACHINING

Please contact us for inserts, drilling and slotting, air bearing applications, engineering, and design assistance. We can custom quote from the following formats: PDF, DWG, DXF™, DWF, eDRW, JPEG, and RASTER IMAGES