Granite Master Squares

Granite Master Squares


PRECISION GRANITE 100% USA MADE and Certified Master Squares


All granite squares are available in custom sizes and configurations: special thickness, threaded inserts, with or without lightening holes. 
*NIST Cert Included* (ISO 17025 complaint cert can be quoted as an option) 

Modern CNC machines require multi-faced reference standards to ensure proper machine alignment. For 35+ years PRECISION GRANITE USA Master Squares have been an accurate, dependable USA MADE and CERTIFIED choice for any machine geometry application or setup.  Master Squares are also especially useful in Quality Labs or Inspection environments providing both Vertical and Horizontal precision surfaces for validating squareness and parallelism of test equipment.

5-FACE Master Squares  *One large face and four edges flat, square and parallel to each other

Size L x H x W LABORATORY Grade AA
.000050”
per 6"
INSPECTION Grade A
.0001” per
6"
12 x 12 x 3  Most Popular Size 12X12X3AA5MS 12X12X3A5MS
14 x 14 x 3 14X14X3AA5MS 14X14X3A5MS
16 x 16 x 3 16X16X3AA5MS 16X16X3A5MS
18 x 18 x 3 18X18X3AA5MS 18X18X3A5MS
24 x 24 x 4 24X24X4AA5MS 24X24X4A5MS



6-FACE Master Squares 
*Two large face and four edges flat, square and parallel to each other

Size L x H x W LABORATORY Grade AA
.000050”
per 6"
INSPECTION Grade A
.0001” 
per 6"
12 x 12 x 3  Most Popular Size 12X12X3AA6MS 12X12X3A6MS
14 x 14 x 3 14X14X3AA6MS 14X14X3A6MS
16 x 16 x 3 16X16X3AA6MS 16X16X3A6MS
18 x 18 x 3 18X18X3AA6MS 18X18X3A6MS
24 x 24 x 4 24X24X4AA6MS 24X24X4A6MS

12X12X3A5MS Precision Granite (Inspection) Grade A 5-Face  Master Square 12" L x 12" H x 3" W

12X12X3A5MS Precision Granite (Inspection) Grade A 5-Face Master Square 12" L x 12" H x 3" W

The 12X12X3A5MS Precision Granite (Inspection) Grade A Master Square 12" L x 12" H x 3" W is on sale..

$1,011.00 $1,042.00

12X12X3A6MS Precision Granite (Inspection) Grade A 6-Face Master Square 12" L x 12" H x 3" W

12X12X3A6MS Precision Granite (Inspection) Grade A 6-Face Master Square 12" L x 12" H x 3" W

The 12X12X3A6MS Precision Granite (Inspection) Grade A 6-Face Master Square 12" L x 12" H x 3" W is ..

$1,273.00 $1,312.00

12X12X3AA5MS Precision Granite (Laboratory) Grade AA 5-Face  Master Square 12" L x 12" H x 3" W

12X12X3AA5MS Precision Granite (Laboratory) Grade AA 5-Face Master Square 12" L x 12" H x 3" W

The 12X12X3AA5MS Precision Granite (Inspection) Grade A Master Square 12" L x 12" H x 3" W is on sal..

$1,253.00 $1,292.00

12X12X3AA6MS Precision Granite (Laboratory) Grade AA 6-Face Master Square 12" L x 12" H x 3" W

12X12X3AA6MS Precision Granite (Laboratory) Grade AA 6-Face Master Square 12" L x 12" H x 3" W

The 12X12X3AA6MS Precision Granite (Laboratory) Grade AA 6-Face Master Square 12" L x 12" H x 3" W i..

$1,579.00 $1,628.00

14X14X3A5MS Precision Granite (Inspection) Grade A 5-Face  Master Square 14" L x 14" H x 3" W

14X14X3A5MS Precision Granite (Inspection) Grade A 5-Face Master Square 14" L x 14" H x 3" W

The 14X14X3A5MS Precision Granite (Inspection) Grade A Master Square 14" L x 14" H x 3" W is on sale..

$1,187.00 $1,224.00

14X14X3A6MS Precision Granite (Inspection) Grade A 6-Face Master Square 14" L x 14" H x 3" W

14X14X3A6MS Precision Granite (Inspection) Grade A 6-Face Master Square 14" L x 14" H x 3" W

The 14X14X3A6MS Precision Granite (Inspection) Grade A 6-Face Master Square 14" L x 14" H x 3" W is ..

$1,498.00 $1,544.00

14X14X3AA5MS Precision Granite (Laboratory) Grade AA 5-Face  Master Square 14" L x 14" H x 3" W

14X14X3AA5MS Precision Granite (Laboratory) Grade AA 5-Face Master Square 14" L x 14" H x 3" W

The 14X14X3AA5MS Precision Granite (Inspection) Grade A Master Square 14" L x 14" H x 3" W is on sal..

$1,557.00 $1,605.00

14X14X3AA6MS Precision Granite (Laboratory) Grade AA 6-Face Master Square 14" L x 14" H x 3" W

14X14X3AA6MS Precision Granite (Laboratory) Grade AA 6-Face Master Square 14" L x 14" H x 3" W

The 14X14X3AA6MS Precision Granite (Laboratory) Grade AA 6-Face Master Square 14" L x 14" H x 3" W i..

$1,963.00 $2,024.00

16X16X3A5MS Precision Granite (Inspection) Grade A 5-Face  Master Square 16" L x 16" H x 3" W

16X16X3A5MS Precision Granite (Inspection) Grade A 5-Face Master Square 16" L x 16" H x 3" W

The 16X16X3A5MS Precision Granite (Inspection) Grade A 5-Face Master Square 16" L x 16" H x 3" W is ..

$1,818.00 $1,874.00

16X16X3A6MS Precision Granite (Inspection) Grade A 6-Face Master Square 16" L x 16" H x 3" W

16X16X3A6MS Precision Granite (Inspection) Grade A 6-Face Master Square 16" L x 16" H x 3" W

The 16X16X3A6MS Precision Granite (Inspection) Grade A 6-Face Master Square 16" L x 16" H x 3" W is ..

$2,290.00 $2,361.00

16X16X3AA5MS Precision Granite (Laboratory) Grade AA 5-Face  Master Square 16" L x 16" H x 3" W

16X16X3AA5MS Precision Granite (Laboratory) Grade AA 5-Face Master Square 16" L x 16" H x 3" W

The 16X16X3A5MS Precision Granite (Inspection) Grade A Master Square 16" L x 16" H x 5" W is on sale..

$2,245.00 $2,314.00

16X16X3AA6MS Precision Granite (Laboratory) Grade AA 6-Face Master Square 16" L x 16" H x 3" W

16X16X3AA6MS Precision Granite (Laboratory) Grade AA 6-Face Master Square 16" L x 16" H x 3" W

The 16X16X3AA6MS Precision Granite (Laboratory) Grade AA 6-Face Master Square 16" L x 16" H x 3" W i..

$2,829.00 $2,916.00

18X18X3A5MS Precision Granite (Inspection) Grade A 5-Face  Master Square 18" L x 18" H x 3" W

18X18X3A5MS Precision Granite (Inspection) Grade A 5-Face Master Square 18" L x 18" H x 3" W

The 18X18X3A5MS Precision Granite (Inspection) Grade A Master Square 18" L x 18" H x 3" W is on sale..

$2,140.00 $2,206.00

18X18X3A6MS Precision Granite (Inspection) Grade A 6-Face Master Square 18" L x 18" H x 3" W

18X18X3A6MS Precision Granite (Inspection) Grade A 6-Face Master Square 18" L x 18" H x 3" W

The 18X18X3A6MS Precision Granite (Inspection) Grade A 6-Face Master Square 18" L x 18" H x 3" W is ..

$2,698.00 $2,781.00

18X18X3AA5MS Precision Granite (Laboratory) Grade AA 5-Face  Master Square 18" L x 18" H x 3" W

18X18X3AA5MS Precision Granite (Laboratory) Grade AA 5-Face Master Square 18" L x 18" H x 3" W

The 18X18X3AA5MS Precision Granite (Laboratory) Grade AA Master Square 18" L x 18" H x 5" W is on sa..

$2,646.00 $2,728.00

18X18X3AA6MS Precision Granite (Laboratory) Grade AA 6-Face Master Square 18" L x 18" H x 3" W

18X18X3AA6MS Precision Granite (Laboratory) Grade AA 6-Face Master Square 18" L x 18" H x 3" W

The 18X18X3AA6MS Precision Granite (Laboratory) Grade AA 6-Face Master Square 18" L x 18" H x 3" W i..

$3,335.00 $3,438.00

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