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Surface Plates
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Rectangular Plate |
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Rectangular Plate with Two Ledges |
With flatness tolerances thinner than a strand of hair, these plates give you the flattest possible surface for accurate measurements. They’re typically used as a reference plane to inspect finished products and calibrate precision measuring tools, such as height gauges and dial indicators. Unlike metal plates, these granite plates won’t rust or interfere with nearby electronics. They also won’t warp when temperatures fluctuate. To maintain their flatness and finish, rotate plates regularly and apply granite cleaner (not included) to remove particles without leaving a residue.
Also Available: Other plate sizes. Please order 2245A999 and specify grade, length, width, thickness, and with or without ledges.
Laboratory-Grade AA Plate—Best for precision inspections and quality-control work in calibration labs. These plates have the tightest flatness tolerance for the highest level of accuracy.
Inspection-Grade A Plate—Your go-to for general inspections and quality-control work. These plates are slightly less precise than grade AA plates with double the flatness tolerance.
Toolroom-Grade B Plate—Suitable for checking routine measurements throughout a shop. These plates are the least precise with four times the flatness tolerance of grade AA plates.
Rectangular Plate with Two Ledges—Choose these plates if you need to mount fixtures and instruments with a clamp.
Black—Harder and denser than red plates to handle heavier loads, such as large bearings and other machined parts.
Red—Resist wear better than black plates to last up to five times longer. With a higher percentage of quartz, you can slide parts across these plates without worrying about nicks and scratches.
Surface Plate Covers—Prevent dust and debris from accumulating on plates when you’re not using them.
Plates | Surface Plate Covers | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Rectangular Plate | Rectangular Plate with Two Ledges | ||||||||||||||||
Flatness Tolerance | Lg. | Wd. | Ht. | Color | Specs. Met | Mil. Spec. | Certificate Type | Wt., lb. | Each | Wt., lb. | Each | Each | |||||
Laboratory-Grade AA Plate | |||||||||||||||||
Black Granite | |||||||||||||||||
| 0.00005" | 6" | 4" | 2" | Black | ASME B89.3.7, ISO 10012 | Fed. Spec. GGG-P-463 | Accuracy Certificate Traceable to NIST | 7 | 2245A101 | 0000000 | — | ——— | 0 | ——— | 0 | ||
| 0.00005" | 12" | 8" | 2" | Black | ASME B89.3.7, ISO 10012 | Fed. Spec. GGG-P-463 | Accuracy Certificate Traceable to NIST | 28 | 2245A81 | 000000 | — | ——— | 0 | 22455A101 | 0000000 | ||
| 0.00005" | 18" | 12" | 4" | Black | ASME B89.3.7, ISO 10012 | Fed. Spec. GGG-P-463 | Accuracy Certificate Traceable to NIST | 93 | 2245A39 | 000000 | 83 | 2245A72 | 0000000 | 22455A64 | 00000 | ||
| 0.000075" | 24" | 18" | 4" | Black | ASME B89.3.7, ISO 10012 | Fed. Spec. GGG-P-463 | Accuracy Certificate Traceable to NIST | 185 | 2245A41 | 000000 | 175 | 2245A53 | 000000 | 22455A65 | 000000 | ||
| 0.0001" | 36" | 24" | 6" | Black | ASME B89.3.7, ISO 10012 | Fed. Spec. GGG-P-463 | Accuracy Certificate Traceable to NIST | 601 | 2245A42 | 00000000 | — | ——— | 0 | 22455A66 | 000000 | ||
| 0.0002" | 48" | 36" | 6" | Black | ASME B89.3.7, ISO 10012 | Fed. Spec. GGG-P-463 | Accuracy Certificate Traceable to NIST | 1,203 | 2245A82 | 00000000 | — | ——— | 0 | 22455A67 | 000000 | ||
Granite | |||||||||||||||||
| 0.00005" | 18" | 12" | 4" | Red | ASME B89.3.7 | Fed. Spec. GGG-P-463 | Accuracy Certificate Traceable to NIST | 84 | 2245A105 | 00000000 | — | ——— | 0 | 22455A64 | 00000 | ||
| 0.000075" | 24" | 18" | 4" | Red | ASME B89.3.7 | Fed. Spec. GGG-P-463 | Accuracy Certificate Traceable to NIST | 168 | 2245A106 | 00000000 | — | ——— | 0 | 22455A65 | 000000 | ||
Inspection-Grade A Plate | |||||||||||||||||
Black Granite | |||||||||||||||||
| 0.0001" | 6" | 4" | 2" | Black | ASME B89.3.7, ISO 10012 | Fed. Spec. GGG-P-463 | Accuracy Certificate Traceable to NIST | 7 | 2245A102 | 000000 | — | ——— | 0 | ——— | 0 | ||
| 0.0001" | 12" | 8" | 2" | Black | ASME B89.3.7, ISO 10012 | Fed. Spec. GGG-P-463 | Accuracy Certificate Traceable to NIST | 28 | 2245A83 | 000000 | — | ——— | 0 | 22455A101 | 000000 | ||
| 0.0001" | 18" | 12" | 4" | Black | ASME B89.3.7, ISO 10012 | Fed. Spec. GGG-P-463 | Accuracy Certificate Traceable to NIST | 93 | 2245A43 | 000000 | 83 | 2245A46 | 000000 | 22455A64 | 00000 | ||
| 0.00015" | 24" | 18" | 4" | Black | ASME B89.3.7, ISO 10012 | Fed. Spec. GGG-P-463 | Accuracy Certificate Traceable to NIST | 185 | 2245A44 | 000000 | 175 | 2245A47 | 000000 | 22455A65 | 000000 | ||
| 0.0002" | 36" | 24" | 6" | Black | ASME B89.3.7, ISO 10012 | Fed. Spec. GGG-P-463 | Accuracy Certificate Traceable to NIST | 555 | 2245A45 | 00000000 | 530 | 2245A48 | 00000000 | 22455A66 | 000000 | ||
| 0.0004" | 48" | 36" | 6" | Black | ASME B89.3.7, ISO 10012 | Fed. Spec. GGG-P-463 | Accuracy Certificate Traceable to NIST | 1,110 | 2245A56 | 00000000 | 1,063 | 2245A49 | 00000000 | 22455A67 | 000000 | ||
Granite | |||||||||||||||||
| 0.0001" | 12" | 8" | 2" | Red | ASME B89.3.7 | Fed. Spec. GGG-P-463 | Accuracy Certificate Traceable to NIST | 20 | 2245A104 | 000000 | — | ——— | 0 | 22455A101 | 000000 | ||
Toolroom-Grade B Plate | |||||||||||||||||
Black Granite | |||||||||||||||||
| 0.0002" | 6" | 4" | 2" | Black | ASME B89.3.7, ISO 10012 | Fed. Spec. GGG-P-463 | Accuracy Certificate Traceable to NIST | 7 | 2245A103 | 000000 | — | ——— | 0 | ——— | 0 | ||
| 0.0002" | 12" | 8" | 2" | Black | ASME B89.3.7, ISO 10012 | Fed. Spec. GGG-P-463 | Accuracy Certificate Traceable to NIST | 21 | 2245A23 | 000000 | — | ——— | 0 | 22455A101 | 000000 | ||
| 0.0002" | 18" | 12" | 3" | Black | ASME B89.3.7, ISO 10012 | Fed. Spec. GGG-P-463 | Accuracy Certificate Traceable to NIST | 70 | 2245A24 | 000000 | 66 | 2245A62 | 000000 | 22455A64 | 00000 | ||
| 0.0003" | 24" | 18" | 3" | Black | ASME B89.3.7, ISO 10012 | Fed. Spec. GGG-P-463 | Accuracy Certificate Traceable to NIST | 139 | 2245A21 | 000000 | 130 | 2245A63 | 000000 | 22455A65 | 000000 | ||
| 0.0004" | 36" | 24" | 4" | Black | ASME B89.3.7, ISO 10012 | Fed. Spec. GGG-P-463 | Accuracy Certificate Traceable to NIST | 370 | 2245A26 | 000000 | 357 | 2245A64 | 000000 | 22455A66 | 000000 | ||
| 0.0008" | 48" | 36" | 6" | Black | ASME B89.3.7, ISO 10012 | Fed. Spec. GGG-P-463 | Accuracy Certificate Traceable to NIST | 1,203 | 2245A38 | 00000000 | — | ——— | 0 | 22455A67 | 000000 | ||
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Rolling |
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Stationary |
Attach to plates at three support points to keep them from sagging and warping, as specified in Fed. Spec. GGG-P-463-c. The welded steel construction offers greater strength, durability, and stability than economical alternatives such as block and wedge systems.
Rolling—Conduct measuring and inspecting tasks anywhere in your facility. With steel plate casters and hard, durable wheels, these stands support the same capacities as their stationary counterparts. Turn the adjustable screws on top of the stand to level the plate on uneven floors.
Stationary—Create a permanent setup for routine measurements and inspections. Twist the mounts at the bottom of each leg to level the plate, even on uneven floors.
For Plate | For Rectangular Plates | For Rectangular Plates with Two Ledges | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Lg. | Wd. | Ht. | Load Cap., lb. | Ht. | Material | Each | Each | ||||
Rolling | |||||||||||
| 18" | 12" | 3", 4" | 400 | 36" | Painted Steel | 2196A711 | 0000000 | 2196A712 | 0000000 | ||
| 24" | 18" | 3", 4" | 500 | 36" | Painted Steel | 2196A721 | 000000 | 2196A722 | 000000 | ||
| 36" | 24" | 4", 6" | 1,200 | 36" | Painted Steel | 2196A731 | 00000000 | 2196A732 | 00000000 | ||
| 48" | 36" | 6" | 2,400 | 36" | Painted Steel | 2196A741 | 00000000 | 2196A742 | 00000000 | ||
Stationary | |||||||||||
| 18" | 12" | 3", 4" | 400 | 36" | Painted Steel | 2196A811 | 000000 | 2196A812 | 000000 | ||
| 24" | 18" | 3", 4" | 500 | 36" | Painted Steel | 2196A821 | 000000 | 2196A822 | 000000 | ||
| 36" | 24" | 4", 6" | 1,200 | 36" | Painted Steel | 2196A831 | 000000 | 2196A832 | 000000 | ||
| 48" | 36" | 6" | 2,400 | 36" | Painted Steel | 2196A841 | 00000000 | 2196A842 | 00000000 | ||
Granite Surface Plate Stands
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Rolling |
|
Stationary |
Secure granite surface plates on these stands to ensure a flat surface for accurate measurements. To keep plates from sagging and warping, stands attach to plates at three support points, as specified in Fed. Spec. GGG-P-463c. The welded steel construction offers greater strength, durability, and stability than economical alternatives such as block and wedge systems.
Rolling—Conduct measuring and inspecting tasks anywhere in your facility. With steel plate casters and hard, durable wheels, these stands support the same capacities as their stationary counterparts. Turn the adjustable screws on top of the stand to level the plate on uneven floors.
Stationary—Create a permanent setup for routine measurements and inspections. Twist the mounts at the bottom of each leg to level the plate, even on uneven floors.
For Plate | For Rectangular Plates | For Rectangular Plates with Two Ledges | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Lg. | Wd. | Ht. | Load Cap., lb. | Ht. | Material | Each | Each | ||||
Rolling | |||||||||||
| 18" | 12" | 3", 4" | 400 | 36" | Painted Steel | 2196A711 | 0000000 | 2196A712 | 0000000 | ||
| 24" | 18" | 3", 4" | 500 | 36" | Painted Steel | 2196A721 | 000000 | 2196A722 | 000000 | ||
| 36" | 24" | 4", 6" | 1,200 | 36" | Painted Steel | 2196A731 | 00000000 | 2196A732 | 00000000 | ||
| 48" | 36" | 6" | 2,400 | 36" | Painted Steel | 2196A741 | 00000000 | 2196A742 | 00000000 | ||
Stationary | |||||||||||
| 18" | 12" | 3", 4" | 400 | 36" | Painted Steel | 2196A811 | 000000 | 2196A812 | 000000 | ||
| 24" | 18" | 3", 4" | 500 | 36" | Painted Steel | 2196A821 | 000000 | 2196A822 | 000000 | ||
| 36" | 24" | 4", 6" | 1,200 | 36" | Painted Steel | 2196A831 | 000000 | 2196A832 | 000000 | ||
| 48" | 36" | 6" | 2,400 | 36" | Painted Steel | 2196A841 | 00000000 | 2196A842 | 00000000 | ||
Economy Rigid-Arm Weighted-Base Variance Indicator Holders
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With Standard Arm | With Fine-Adjustment Arm |
Base | Upright Post | Arm | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
For Mounting Lug Hole Dia. | For Mounting Stem Dia. | Surface Accuracy | Throat Dp. | Type | Lg. | Wd. | Ht. | Thread Size | Material | Dia. | Ht. | Material | Lg. | Type | Each | |||
Stem Mount | ||||||||||||||||||
| — | 3/8" | ±0.00025" | 2 3/8" | Flat | 6" | 6" | 2" | 3/8"-16 | Granite | 1 1/4" | 8" | Stainless Steel | 4 1/8" | Rigid | 86285A43 | 0000000 | ||
| — | 3/8" | ±0.00025" | 4 25/32" | Flat | 12" | 18" | 4" | 3/8"-16 | Granite | 1 1/4" | 12" | Stainless Steel | 6 9/16" | Rigid | 86285A56 | 000000 | ||
| — | 3/8" | ±0.00025" | 5 5/8" | Flat | 8" | 12" | 2" | 3/8"-16 | Granite | 1 1/4" | 12" | Stainless Steel | 7 3/8" | Rigid | 86285A55 | 000000 | ||
Lug Mount | ||||||||||||||||||
Variance Indicator Holders | ||||||||||||||||||
| 1/4" | — | ±0.00025" | 2 3/8" | Flat | 6" | 6" | 2" | 3/8"-16 | Granite | 1 1/4" | 8" | Steel | 4 1/8" | Rigid | 86285A54 | 000000 | ||
Fine-Adjustment Arm | ||||||||||||||||||
| 1/4" | — | ±0.00005" | 4 3/4" | Flat | 12" | 9" | 2" | M12 x 1.25 mm | Granite | 1 1/4" | 12" | Steel | 7 1/4" | Rigid | 86285A41 | 000000 | ||
| 1/4" | — | ±0.00005" | 4 3/4" | Flat | 12" | 18" | 3" | M12 x 1.25 mm | Granite | 1 1/4" | 12" | Steel | 7 1/4" | Rigid | 86285A42 | 000000 | ||
| 1/4" | — | ±0.0005" | 2 3/8" | Flat | 6" | 6" | 2" | M10 x 1.5 mm | Granite | 1" | 8" | Steel | 1 7/8" | Rigid | 86285A51 | 000000 | ||
Granite Surface Plate Cleaners
 |  |  |
Spray Bottle | Bottle | Jug |
Remove particles from granite surface plates without leaving a residue.
Economy Flexible-Arm Weighted-Base Variance Indicator Holders
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With Granite Base |
Adjust the flexible ball-and-socket segmented arm to nearly any position and lock in place. A heavy base adds stability.
Granite—Holders with a granite base have an extremely tight flatness tolerance. Their flatness gives you an accurate reference for inspection work and lets you move workpieces in and out smoothly. These holders have a fine-adjustment clamp to position indicators at precise angles.
Economy Jointed-Arm Weighted-Base Variance Indicator Holders
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Stabilize and precisely position your indicator with these weighted bases. Attached to the base, these holders have a jointed arm for moving your indicator up and down and in and out. Tighten the knob on the arm to lock it in place and use the fine-adjustment clamp for angling your indicator just right. Made of granite, the base has an extremely tight flatness tolerance, so it creates an accurate reference point for inspection work. It also means you can easily slide your workpiece in and out.
Base | Arm | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
For Mounting Stem Dia. | Type | Lg. | Wd. | Ht. | Thread Size | Material | Lg. | Dia. | Type | Granite Base Flatness Tolerance | Each | |||
Dovetail and Stem Mount | ||||||||||||||
Fine-Adjustment Arm, Fine-Adjustment Clamp | ||||||||||||||
| 8 mm, 3/8" | Flat | 12" | 9" | 2" | 5/16"-18 | Granite | 12 1/2" | 0.495" | Jointed | -0.00015" to 0.00015" | 5545N11 | 0000000 | ||
| 8 mm, 3/8" | Flat | 18" | 12" | 3" | 5/16"-18 | Granite | 14" | 0.495" | Jointed | -0.00015" to 0.00015" | 5545N12 | 000000 | ||
Precision Weighted-Base Variance Indicator Holders
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With Rigid Arm | With Jointed Arm |
These holders come with a certificate of accuracy traceable to NIST stating that the granite base has passed a test for surface accuracy. The extremely tight flatness tolerances of the granite allow for nearly frictionless workpiece movement and provide an accurate reference plane for inspection work.
Jointed Arm—Holders with jointed arm have a fine-adjustment knob for precise positioning.
Base | Upright Post | Arm | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
For Mounting Lug Hole Dia. | For Mounting Stem Dia. | Surface Accuracy | Throat Dp. | Lg. | Wd. | Ht. | Thread Size | Material | Dia. | Ht. | Material | Lg. | Type | Features | Each | |||
Stem Mount | ||||||||||||||||||
| — | 3/8" | ±0.00005" | 1 3/4" | 6" | 6" | 2" | 1/2"-13 | Granite | 1 1/4" | 8" | Steel | 4 1/8" | Rigid | — | 8628A16 | 0000000 | ||
| — | 3/8" | ±0.0001" | 5" | 8" | 12" | 2" | 1/2"-13 | Granite | 1 1/4" | 12" | Steel | 7 5/16" | Jointed | Fine-Adjustment Arm | 8628A12 | 000000 | ||
| — | 3/8" | ±0.0001" | 5" | 12" | 18" | 4" | 1/2"-13 | Granite | 1 1/4" | 12" | Steel | 7 5/16" | Jointed | Fine-Adjustment Arm | 8628A14 | 000000 | ||
Lug Mount | ||||||||||||||||||
| 1/4" | — | ±0.00005" | 1 3/4" | 6" | 6" | 2" | 1/2"-13 | Granite | 1 1/4" | 8" | Steel | 4 1/8" | Rigid | — | 8628A15 | 000000 | ||
| 1/4" | — | ±0.0001" | 5" | 8" | 12" | 2" | 1/2"-13 | Granite | 1 1/4" | 12" | Steel | 7 5/16" | Jointed | Fine-Adjustment Arm | 8628A11 | 000000 | ||
| 1/4" | — | ±0.0001" | 5" | 12" | 18" | 4" | 1/2"-13 | Granite | 1 1/4" | 12" | Steel | 7 5/16" | Jointed | Fine-Adjustment Arm | 8628A13 | 000000 | ||
