Granite is one of the best materials available today to meet the ever changing and sophisticated applications demanding coplanarity, perpendicularity, parallelism, flatness, and straightness. It is often chosen for its stability and high accuracies. With PRECISION GRANITE® you can depend on excellent quality, high accuracies, and quick delivery. See our price list for sizes and accuracies of our standard products which can usually ship in less than a week. Major credit cards accepted.
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 ASME B89.3.7-2013 and 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 ASME B89.3.7-2013 and 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.
Specialclamp 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
5-Face – One large face & four edges flat, square and parallel to each other with lightening holes 6-Face – Two large faces & four edges flat, square and parallel to each other with lightening holes All granite products available in custom sizes and thicknesses, with threaded inserts, and without lightening holes
PARALLELS
2-Face finished on narrow edges
4-Face finished on narrow and wide edges
STRAIGHT EDGE
1-Face – Accuracy on one long narrow edge 2-Face – Two long narrow edges flat and parallel to each other
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
