Inspection Grade A Surface Plates

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Surface Plate Grade

Plate Shape

Rectangle with Two Ledges

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Color

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Specifications Met

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U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Yes

REACH

Not Compliant

DFARS Specialty Metals

Exempt

Export Control Classification Number (ECCN)

Squareness Tolerance

33 Products

Surface Plates

Rectangular Plate

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.

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.

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
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	0000000	—	———	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	0000000
				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	0000000	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

Surface Plate Stands

Rolling

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 Inspection Setup Blocks

Image of Product. Front orientation. Inspection Setup Blocks.

Machined in pairs, these blocks are precision ground to tolerances thinner than a sheet of paper to give you the flattest and squarest surface for positioning workpieces. Since they are perfectly aligned to one another, they’ll keep your workpieces level and parallel. Also known as 1-2-3 blocks, they're typically used to elevate, support, and align parts for measuring and inspecting. They're made from granite, so they won’t scratch the surface of your workpiece. They also won’t warp when temperatures fluctuate. Unlike metal blocks, these granite blocks are nonmagnetic, so they won’t interfere with sensitive electronic equipment. They come with a certificate of accuracy that's traceable to NIST.

Inspection-Grade A Plate—Inspection-grade A blocks are your go-to for general inspections and quality-control work. These blocks are slightly less precise than grade AA blocks with double the tolerance.

				Tolerance
	Lg.	Wd.	Ht.	Lg.	Wd.	Ht.	Squareness	Parallel	Material	Certificate Type		Pair
Sold as Matched Pair







				Inspection-Grade A Plate

				1"	3"	2"	-0.0002" to 0.0002"	-0.0002" to 0.0002"	-0.0002" to 0.0002"	0.0001"	0.0001"	Black Granite	Accuracy Certificate Traceable to NIST	8140N102	0000000