Aluminum CMM Plates | McMaster-Carr

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75 Products

Fixture Plates

Lay the foundation for your fixturing setup. These plates have a grid with evenly spaced threaded holes to install angle brackets and other fixturing components. They’re often used to help secure workpieces for measuring and inspecting. Just like a battleship gameboard, the edges are labeled with letters and numbers, making it easy to identify holes. While these lightweight plates aren’t for machining, you can use them for light fabrication jobs, such as laser marking. All can be attached to your table with clamps (not included), making them easy to remove and swap.

Fixture Plates

Plates with mounting holes can be bolted down on fixture tables for more stability than those held down by clamps. Make sure the grid of your plate and table align for precise measurements.

Anodized Aluminum—Anodized aluminum plates are often used with coordinate measuring machines (CMMs) and optical comparators. The coating protects them from scratches and wear, even when you’re working with heavy parts.

					Holes		Bolt-On Mount
	Lg.	Wd.	Thk.	Parallel Tolerance	No. of	Ctr.-to-Ctr.	Mounting Fasteners Included	No. of Mounting Holes	Mounting Hole Style	For Mounting Fastener Thread Size	Material		Each
1/4"-20 Hole Thread Size



		3"	3"	1/2"	0.025"	21	1/2"	Yes	4	Counterbored	1/4"-20	Anodized Aluminum	0000000	0000000


		3"	6"	1/2"	0.025"	51	1/2"	Yes	4	Counterbored	1/4"-20	Anodized Aluminum	0000000	000000
		6"	6"	3/8"	0.025"	121	1/2"	—	—	—	—	Anodized Aluminum	0000000	000000
		12"	12"	1/2"	0.005"	484	1/2"	—	—	—	—	Anodized Aluminum	0000000	000000
		18"	18"	1/2"	0.01"	1,156	1/2"	—	—	—	—	Anodized Aluminum	0000000	00000000
		24"	24"	3/4"	0.01"	2,116	1/2"	—	—	—	—	Anodized Aluminum	0000000	00000000


		M6 Hole Thread Size



				150 mm	150 mm	10 mm	0.635 mm	81	15 mm	—	—	—	—	Anodized Aluminum	0000000	000000


				300 mm	300 mm	13 mm	0.635 mm	324	15 mm	—	—	—	—	Anodized Aluminum	0000000	000000
				450 mm	450 mm	13 mm	0.635 mm	729	15 mm	—	—	—	—	Anodized Aluminum	0000000	00000000
				600 mm	600 mm	19 mm	0.635 mm	1,369	15 mm	—	—	—	—	Anodized Aluminum	0000000	00000000


				M8 Hole Thread Size



						300 mm	300 mm	13 mm	0.635 mm	289	15 mm	—	—	—	—	Anodized Aluminum	0000000	000000


						450 mm	450 mm	13 mm	0.635 mm	729	15 mm	—	—	—	—	Anodized Aluminum	0000000	00000000

Quick-Change Adapters

Quick-change adapters fasten to the side of plates, converting them into quick-change fixture plates. Rather than having to clamp or bolt plates down, adapters let you snap them in and out of a magnetic mounting rail.

			Magnetic Mount		Bolt-On Mount
Lg.	Wd.	Thk.	Max. Magnetic Pull, lbf	No. of Mounting Edges	Mounting Fasteners Included	No. of Mounting Holes	For Mounting Fastener Thread Size	Mounting Hole Ctr.-to-Ctr.	Material		Each



	6"	1"	1/2"	3.5	1	Yes	2	10-32	5 1/2"	Anodized Aluminum	0000000	0000000


	180 mm	30 mm	13 mm	3.5	1	Yes	2	M6	147 mm	Anodized Aluminum	0000000	000000

Fixturing for Parts Inspection

From towers and brackets to standoffs and supports, these components are the building blocks for your custom fixturing setup. They elevate parts so you can access a variety of angles for measuring and inspecting while protecting your measuring device from hitting the inspection table. You’ll often see them used with coordinate measuring machines (CMMs). They’re not for use in machining applications.

Fixture Towers

Fixture towers give you four vertical grids and a small horizontal one on top, so you can set up custom scaffolds to position parts in several planes. Their height makes them useful for propping up large workpieces. Each tower can uphold multiple parts. The threaded holes on the vertical grids are labeled with letters and numbers, making it easy to identify holes.

		Tower		Base
	Overall Ht.	Lg.	Wd.	Lg.	Wd.	Number of Holes	Material	Includes		Each
1/4"-20 Hole Thread Size



		6"	1"	1"	5"	1"	41	Aluminum	—	0000000	0000000


		12"	1 1/2"	1 1/2"	6"	1 1/2"	180	Aluminum	—	0000000	000000
		24"	2"	2"	6"	2"	372	Aluminum	—	0000000	000000


		M6 Hole Thread Size



				150 mm	25 mm	25 mm	127 mm	25 mm	33	Aluminum	Two M6 Knurled Knobs	0000000	000000

Angle Brackets

Angle brackets create a 90° mounting point, so you can secure small workpieces with supports. Shorter than towers, they’re a good choice for parts that are about the size of your palm. The base bolts into your surface, so these brackets won’t budge.

				Slots
	Lg.	Wd.	Ht.	Lg.	Wd.	Number of Holes	Material	Includes		Each
1/4"-20 Hole Thread Size



		3"	1"	3"	1 3/4"	1/4"	18	Aluminum	—	0000000	000000


		M6 Hole Thread Size



				76 mm	25 mm	76 mm	44 mm	7.8 mm	18	Aluminum	Two M6 Bolts	0000000	00000


				M8 Hole Thread Size



						76 mm	25 mm	76 mm	44 mm	7.2 mm	12	Aluminum	Two M8 Bolts	0000000	00000

Standoffs


	Adjustable Standoff Height

Standoffs raise the height of towers and angle brackets or extend the reach of supports and clamps. Screw them into one another for added length.

Adjustable Standoff Height—Standoffs with adjustable height have a thumb screw to raise and lower components with precision.

	Material		Each
1/4"-20 Threads







	Adjustable Standoff Height

	1/2"	1 7/16" to 1 3/4"	1/4"	Aluminum	0000000	000000

Corner Plates

Corner plates act as a repeatable stop, making it easy for your CMM and vision system to find your workpiece. When using them with a vision system, fasten them to an acrylic plate. They have threaded holes for standoffs and other fixturing components.

	Wd.	Thk.	Number of Holes	Material	Includes		Each
1/4"-20 Hole Thread Size



	1 3/4"	1 3/4"	1/4"	5	Aluminum	Two 1/4"-20 Bolts	0000000	000000


	3 1/4"	3 1/4"	1/4"	11	Aluminum	Two 1/4"-20 Bolts	0000000	00000


	M6 Hole Thread Size



			44 mm	44 mm	6 mm	5	Aluminum	Two M6 Bolts	0000000	00000


			75 mm	75 mm	6 mm	9	Aluminum	Two M6 Bolts	0000000	00000

Quick-Change Fixture Plates

Snap these magnetic plates in and out of the mounting rail as swappable stages for measuring and inspecting parts. Unlike standard fixture plates that you need to bolt or clamp down, these quickly attach and release, creating a hub of plates that are locked and loaded. As your coordinate measuring machine (CMM) works in the background, position your next workpiece on another plate so it’s ready to switch out for the next run. If you need more room to inspect parts, combine plates in a chain to extend your surface. While they’re not sturdy enough for use in machining, you can use them for light fabrication work, such as laser engraving.

When docked on a rail, the strong magnets in these plates hold them still. The lightweight aluminum makes them easy to lift and swap, and an anodized coating protects them from scratches and wear, even if you’re working with heavy parts.

Fixture Plates


1 Mounting Edge	4 Mounting Edges

Fixture plates hold components such as towers, clamps, and standoffs in the evenly spaced holes to raise and position parts.

4 Mounting Edges—Plates with four mounting edges can be rotated in 90° increments. Instead of having to reposition your workpieces, turn the plate to access other angles.

					Holes
	Lg.	Wd.	Thk.	Parallel Tolerance	No. of	Ctr.-to-Ctr.	Max. Magnetic Pull, lbf	Material		Each
1 Mounting Edge—1/4"-20 Hole Thread Size



		6"	6"	1/2"	0.005"	36	1"	3.5	Anodized Aluminum	0000000	0000000


		6"	12"	1/2"	0.005"	72	1"	3.5	Anodized Aluminum	0000000	000000
		6"	12"	1/2"	0.005"	237	1/2"	3.5	Anodized Aluminum	0000000	000000
		6"	18"	1/2"	0.005"	108	1"	3.5	Anodized Aluminum	0000000	000000
		12"	6"	1/2"	0.005"	72	1"	3.5	Anodized Aluminum	0000000	000000
		12"	12"	1/2"	0.005"	144	1"	3.5	Anodized Aluminum	0000000	000000
		12"	18"	1/2"	0.005"	216	1"	3.5	Anodized Aluminum	0000000	000000
		18"	18"	1/2"	0.005"	324	1"	3.5	Anodized Aluminum	0000000	00000000
		18"	24"	1/2"	0.005"	432	1"	3.5	Anodized Aluminum	0000000	00000000


		1 Mounting Edge—M6 Hole Thread Size



				180 mm	180 mm	13 mm	0.127 mm	81	20 mm	3.5	Anodized Aluminum	0000000	000000


				180 mm	360 mm	13 mm	0.127 mm	162	20 mm	3.5	Anodized Aluminum	0000000	000000
				360 mm	360 mm	13 mm	0.127 mm	324	20 mm	3.5	Anodized Aluminum	0000000	000000
				360 mm	540 mm	13 mm	0.127 mm	486	20 mm	3.5	Anodized Aluminum	0000000	00000000


				4 Mounting Edges—1/4"-20 Hole Thread Size



						6"	6"	1/2"	0.005"	52	1"	3.5	Anodized Aluminum	0000000	000000

Corner Plates

Image of Product. Bottom orientation. Contains Annotated. Coordinate Measuring Machine Plates and Fixtures. Quick-Change Fixture Plates, Corner Plates.

Corner plates make it easy for your CMM to find a workpiece since they act as a repeatable stop. The negative space gives you access underneath parts that are propped up.

					Holes
	Lg.	Wd.	Thk.	Parallel Tolerance	No. of	Ctr.-to-Ctr.	Max. Magnetic Pull, lbf	Material		Each
1 Mounting Edge—1/4"-20 Hole Thread Size



		6"	6"	1/2"	0.005"	15	1"	3.5	Anodized Aluminum	0000000	0000000


		1 Mounting Edge—M6 Hole Thread Size



				180 mm	180 mm	13 mm	0.127 mm	22	20 mm	3.5	Anodized Aluminum	0000000	000000

Plates for Calibration Spheres

Image of Product. Bottom orientation. Contains Annotated. Coordinate Measuring Machine Plates and Fixtures. Quick-Change Fixture Plates, Plates for Calibration Spheres.

Plates for calibration spheres take the work out of threading a sphere in and out of your table every time you calibrate your CMM. Move them off to the side when you’re not calibrating to prevent the probe of your CMM from crashing into the sphere. Keeping your sphere up and out of the way instead of stored in a drawer protects it from scrapes and bumps.

	Wd.	Thk.	Parallel Tolerance	For Stud Thread Size	Max. Magnetic Pull, lbf	Material		Each
1 Mounting Edge



	6"	3"	1/2"	0.005"	M8	3.5	Anodized Aluminum	0000000	0000000


	180 mm	80 mm	13 mm	0.127 mm	M8	3.5	Anodized Aluminum	0000000	000000

Mounting Rails

Mounting rails are the home base for your magnetic fixture plates, corner plates, and plates for calibration spheres. Bolt them to your table to secure the dock for your quick-change system hub. Quick-change plate adapters allow you to convert a standard fixture plate into a quick-change fixture plate compatible with the mounting rail.

			Magnetic Mount		Bolt-On Mount
Lg.	Wd.	Thk.	Max. Magnetic Pull, lbf	No. of Mounting Edges	Mounting Fasteners Included	No. of Mounting Slots	Mounting Slot Lg.	Mounting Slot Wd.	Material		Each



	18"	2"	1/2"	3.5	3	No	2	5 7/16"	1/2"	Anodized Aluminum	0000000	0000000


	30"	2"	1/2"	3.5	5	No	6	3 1/8"	1/2"	Anodized Aluminum	0000000	000000
	540 mm	50 mm	13 mm	3.5	3	No	3	120 mm	13 mm	Anodized Aluminum	0000000	000000
	720 mm	50 mm	13 mm	3.5	4	No	6	68 mm	13 mm	Anodized Aluminum	0000000	000000

Clamps for Parts Inspection

With a light yet sturdy hold, these clamps help you keep workpieces in place hands-free for measuring and inspecting. Thread them right into your fixturing surface, whether it’s a plate, tower, or table. Because they apply less pressure than machining clamps, they won’t distort your parts, so you can take accurate measurements. While these clamps aren’t sturdy enough for use in machining, you can still use them for light fabrication work, such as laser engraving.

Hold-Down Clamps

Tension Spring

Wire

Tension

Spring

Thumb

Screw

Hold-down clamps secure parts from the top.

Tension Spring—Tension spring clamps are the most common type of clamp. Slide the arm down the shaft until it touches the top of your workpiece. Since you apply pressure directly, using too much force might move your part.

Wire Tension Spring—Wire tension spring clamps have a slimmer profile than standard clamps, which means they don’t cover up as much of your workpiece. They’re often used to clamp small parts. Pull the wire arm away from the shaft, position your part, then release the arm so it moves back to cradle your part in place.

Thumb Screw—Clamps with a thumb screw give you more control over the pressure you apply on a workpiece than tension spring clamps. Twisting the screw moves the clamp up or down in small increments, so they’re less likely to dent or scratch your workpiece. The knurled head on the screw is slip resistant, letting you make precise turns with reliable grip.

Rubber-Coated Tip—Clamps with a rubber-coated tip are less likely to scrape parts than clamps with an uncoated tip.

	Reach Lg.	Material	Tip Finish		Each
Tension Spring







		1/4"-20 Threads

		13/16"	1"	1/4"	Aluminum	—	0000000	000000


		13/16"	2"	1/4"	Aluminum	—	0000000	00000
		1 9/16"	2 3/4"	1/4"	Aluminum	—	0000000	00000
		1 9/16"	2 3/4"	1/4"	Aluminum	Rubber Coated	0000000	00000
		2 5/16"	2 3/4"	1/4"	Aluminum	—	0000000	00000
		2 5/16"	2 3/4"	1/4"	Aluminum	Rubber Coated	0000000	00000
		3 7/16"	3"	1/4"	Aluminum	—	0000000	00000




				M4 × 0.7 mm Threads

				21 mm	50 mm	4.5 mm	Aluminum	—	0000000	00000


				38 mm	50 mm	4.5 mm	Aluminum	—	0000000	00000
				58 mm	50 mm	4.5 mm	Aluminum	—	0000000	00000




						M6 × 1 mm Threads

						21 mm	50 mm	6.2 mm	Aluminum	—	0000000	00000


						38 mm	75 mm	6.2 mm	Aluminum	—	0000000	00000
						58 mm	75 mm	6.2 mm	Aluminum	—	0000000	00000




								M8 × 1.25 mm Threads

								38 mm	75 mm	6.2 mm	Aluminum	—	0000000	00000


								58 mm	75 mm	6.2 mm	Aluminum	—	0000000	00000


								Wire Tension Spring







												1/4"-20 Threads

												1 1/4"	1"	1/4"	Aluminum	—	0000000	00000


2"	2"											1/4"	Aluminum	—	0000000	00000


Thumb Screw







												1/4"-20 Threads

												1 9/16"	1 1/2"	3/8"	Aluminum	—	0000000	00000


												3"	2 1/2"	1/4"	Aluminum	—	0000000	00000
												4 3/8"	3 1/2"	3/8"	Aluminum	—	0000000	000000




												M6 × 1 mm Threads

												40 mm	38 mm	9.5 mm	Aluminum	—	0000000	00000


												76 mm	63 mm	6.4 mm	Aluminum	—	0000000	00000
												112 mm	89 mm	9.5 mm	Aluminum	—	0000000	000000

Positioning Clamps

Positioning clamps give you the most flexible setup of any clamps. They’re the best choice for curved or irregular shapes, such as cylinders. Both sliding pins on each arm have an O-ring that compresses when you push them tight against a workpiece. The O-ring cushions the pressure you apply, and it also gives grip while protecting parts from scratches. With an arm that rotates 360°, you can create movable supports. These clamps also have a magnetic flange to help secure metal parts.

	Opening
Reach Lg.	Min.	Max.	Lg.	Wd.	Ht.	Thread Lg.	Material		Pair







			1/4"-20 Threads

			3/4"	7/16"	2 3/4"	3 5/8"	9/16"	2 1/2"	1/4"	Aluminum	0000000	0000000




					M6 × 1 mm Threads

					19 mm	11 mm	57 mm	92 mm	12.7 mm	63 mm	6.4 mm	Aluminum	0000000	000000

Fixture Tables for Parts Inspection

Create a fixture setup on these tables to inspect your parts. A built-in threaded fixture plate gives you endless possibilities to attach CMM fixturing clamps and other accessories right where you need them. Labeled around the edge with letters and numbers—just like a battleship game board—it’s easy to identify holes and repeat tasks. To adjust their height slightly and move these tables around your workspace, they come with leveling casters. Tables come assembled.

Tables

Overall					Holes
Lg.	Wd.	Ht.	Wt. Cap., lb.	Plate Thk.	No. of	Ctr.-to-Ctr.	Flatness Tolerance	Frame Material	Plate Material	Wheel Configuration	Features		Each







			1/4"-20 Hole Thread Size

			47 1/4"	35 3/8"	35 3/8"	880	3/4"	1,564	1"	0.005"	Aluminum	Aluminum	Four Swivel Casters	Leveling Casters, Numbered and Lettered Holes	0000000	000000000




					M6 Hole Thread Size

					1,200 mm	900 mm	900 mm	880	19 mm	1,645	25 mm	0.127 mm	Aluminum	Aluminum	Four Swivel Casters	Leveling Casters, Numbered and Lettered Holes	0000000	00000000