Starrett Center Gauges | McMaster-Carr

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50 Products

Threads per Inch and Center Identifiers

Identify threads per inch on external threads and find the center of your workpiece to line up thread-cutting tools. This identifier has a corrosion-resistant satin-chrome finish that reduces glare.

	For Threads per In.	Lg.	Wd.	Thk.	Mfr.	Mfr. Model No.	Appearance		Each
Inch







	Chrome-Plated Steel

	Screws, Bolts, Threaded Rods	UNC/UNF	External	14, 20, 24, 32	2 1/4"	3/4"	3/64"	Starrett	C391	Satin	0000000	000000

Starrett High-Accuracy Combination Square Heads

Attach to Starrett High-Accuracy Combination Square Blades with the included lockbolts.

Center Heads

Center heads identify the center on pipes, rods, and shafts.

Cast Iron—Cast iron heads are durable, so they resist dents and scratches. However, they corrode more easily than zinc alloy heads.

Hardened Steel—Hardened steel heads are more durable and last longer than cast iron heads.

	Cast Iron		Hardened Steel
For Blade Lg.		Each		Each
4"	0000000	000000	0000000	000000
6"	0000000	00000	0000000	000000
12" to 48"	0000000	00000	0000000	000000

Replacement Square Head Lockbolts

For Head Style	For Blade Lg.	Each
Center, Square	4"	000000
Center, Square	6"	00000
Center	6"	00000
Center, Square, Protractor	12" to 36"/300 mm to 600 mm	0000

Starrett High-Accuracy Combination Squares

Replace your try square, miter square, depth gauge, height gauge, center-point finder, and level. The blade on these squares meets Fed. Spec. GGG-R-791H, which establishes uniform standards for accuracy, graduations, and size. Blades are labeled with numeric increments that are less than 1" for quick reading.

Blades with Square Head and Center Head


	Inch

Square head checks 90° angles.

Center head identifies the center on pipes, rods, and shafts.

Satin Blade—Satin blade appearance is corrosion resistant and reduces glare.

Etched—Etched graduation marks are wear resistant.

					Blade					Graduation		Cast Iron Square Head
	Blade Lg.	Front Graduations (Numeric Graduations)	Back Graduations (Numeric Graduations)	Lg. Accuracy	Wd.	Thk.	Material	Appearance	Color	Color	Type	Head Lg.		Each
Inch



		4"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.002" to 0.004"	5/8"	1/16"	Steel	Satin	Chrome, Silver	Black	Etched	2 1/4"	0000000	0000000

Replacement Square Head Lockbolts

		Each
Replacement Lockbolt for Square and Center Heads	0000000	000000

Blades with Square Head with Built-In Level, Center Head, and Scriber


	Inch

Square head checks 90° angles.

Center head identifies the center on pipes, rods, and shafts.

Hardened Steel Square Head—Hardened-steel square heads are more durable and last longer than cast iron square heads.

Satin Blade—Satin blade appearance is corrosion resistant and reduces glare.

Etched—Etched graduation marks are wear resistant.

					Blade					Graduation		Cast Iron Square Head			Hardened Steel Square Head
	Blade Lg.	Front Graduations (Numeric Graduations)	Back Graduations (Numeric Graduations)	Lg. Accuracy	Wd.	Thk.	Material	Appearance	Color	Color	Type	Head Lg.		Each	Head Lg.		Each
Inch



		6"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.002" to 0.004"	3/4"	5/64"	Steel	Satin	Chrome, Silver	Black	Etched	—	———	0	2 13/32"	0000000	0000000


		12"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.0035" to 0.005"	1"	3/32"	Steel	Satin	Chrome, Silver	Black	Etched	4 1/2"	0000000	0000000	3 5/8"	0000000	000000

Replacements for Squares

		Each
Replacement Case for Combination Squares with 12" Long Blade	0000000	0000000
Replacement Lockbolt for Center Heads	0000000	00000
Replacement Lockbolt for Square and Center Heads	0000000	00000
Replacement Lockbolt for Square, Center, and Protractor Heads	0000000	0000

Blades with Square Head with Built-In Level, Center Head, Protractor Head, and Scriber


	Inch

Square head checks 90° angles.

Protractor head measures angles.

Center head identifies the center on pipes, rods, and shafts.

Etched—Etched graduation marks are wear resistant.

					Blade				Graduation		Cast Iron Square Head
	Blade Lg.	Front Graduations (Numeric Graduations)	Back Graduations (Numeric Graduations)	Lg. Accuracy	Wd.	Thk.	Material	Color	Color	Type	Head Lg.		Each
Inch



		12"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.0035" to 0.005"	1"	3/32"	Steel	Silver	Black	Etched	4 1/2"	0000000	0000000


		18"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.0035" to 0.006"	1"	3/32"	Steel	Silver	Black	Etched	4 1/2"	0000000	000000
		24"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.0035" to 0.007"	1"	3/32"	Steel	Silver	Black	Etched	4 1/2"	0000000	000000

Replacements for Squares

Blades with Square Head with Built-In Level, Center Head, Reversible Protractor Head, and Scriber


	Inch/Metric

Inch

Square head checks 90° angles.

Protractor head measures angles.

Center head identifies the center on pipes, rods, and shafts.

Hardened Steel Square Head—Hardened-steel square heads are more durable and last longer than cast iron square heads.

Satin Blade—Satin blade appearance is corrosion resistant and reduces glare.

Etched—Etched graduation marks are wear resistant.

					Blade					Graduation		Cast Iron Square Head			Hardened Steel Square Head
	Blade Lg.	Front Graduations (Numeric Graduations)	Back Graduations (Numeric Graduations)	Lg. Accuracy	Wd.	Thk.	Material	Appearance	Color	Color	Type	Head Lg.		Each	Head Lg.		Each
Inch



		12"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.0035" to 0.005"	1"	3/32"	Steel	—	Silver	Black	Etched	4 1/2"	0000000	0000000	—	———	0


		12"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.0035" to 0.005"	1"	3/32"	Steel	Satin	Chrome, Silver	Black	Etched	—	———	0	3 5/8"	0000000	0000000
		12"	1/32" (4/32"), 1/64" (8/64")	1/50" (1/10"), 1/100" (1/10")	-0.0035" to 0.005"	1"	3/32"	Steel	—	Silver	Black	Etched	4 1/2"	0000000	000000	—	———	0
		12"	1/32" (4/32"), 1/64" (8/64")	1/50" (1/10"), 1/100" (1/10")	-0.0035" to 0.005"	1"	3/32"	Steel	Satin	Chrome, Silver	Black	Etched	—	———	0	3 5/8"	0000000	000000
		18"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.0035" to 0.006"	1"	3/32"	Steel	—	Silver	Black	Etched	4 1/2"	0000000	000000	—	———	0
		18"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.0035" to 0.006"	1"	3/32"	Steel	Satin	Chrome, Silver	Black	Etched	—	———	0	3 5/8"	0000000	000000
		18"	1/32" (4/32"), 1/64" (8/64")	1/50" (1/10"), 1/100" (1/10")	-0.0035" to 0.006"	1"	3/32"	Steel	Satin	Chrome, Silver	Black	Etched	—	———	0	3 5/8"	0000000	000000
		24"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.0035" to 0.007"	1"	3/32"	Steel	—	Silver	Black	Etched	4 1/2"	0000000	000000	—	———	0
		24"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.0035" to 0.007"	1"	3/32"	Steel	Satin	Chrome, Silver	Black	Etched	—	———	0	3 5/8"	0000000	000000
		24"	1/32" (4/32"), 1/64" (8/64")	1/50" (1/10"), 1/100" (1/10")	-0.0035" to 0.007"	1"	3/32"	Steel	Satin	Chrome, Silver	Black	Etched	—	———	0	3 5/8"	0000000	000000


		Inch/Metric



				11 3/4"/300 mm	0.5 mm (10 mm), 1/32" (4/32")	1 mm (10 mm), 1/64" (8/64")	-0.0035" to 0.005"/ -0.09 mm to 0.15 mm	1"	3/32"	Steel	—	Silver	Black	Etched	4 1/2"	0000000	000000	—	———	0


				11 3/4"/300 mm	0.5 mm (10 mm), 1/32" (4/32")	1 mm (10 mm), 1/64" (8/64")	-0.0035" to 0.005"/ -0.09 mm to 0.15 mm	1"	3/32"	Steel	Satin	Chrome, Silver	Black	Etched	—	———	0	3 5/8"	0000000	000000
				23 1/2"/600 mm	0.5 mm (10 mm), 1/32" (4/32")	1 mm (10 mm), 1/64" (8/64")	-0.0035" to 0.007"/ -0.11 mm to 0.25 mm	1"	3/32"	Steel	—	Silver	Black	Etched	4 1/2"	0000000	000000	—	———	0

Replacements for Squares

Starrett High-Accuracy Combination Square Blades


Inch	Inch/Metric

Use these blades with Starrett High-Accuracy Combination Square Heads. They meet Fed. Spec. GGG-R-791, which establishes uniform standards for accuracy, graduations, and size. Blades are labeled with numeric increments that are less than 1" for quick reading. All have a corrosion-resistant satin chrome-plated finish that reduces glare and wear-resistant etched markings.

								Graduation
	Lg.	Front Graduations (Numeric Graduations)	Back Graduations (Numeric Graduations)	Lg. Accuracy	Wd.	Thk.	Color	Color	Type		Each
Inch







				Satin Chrome-Plated Steel

				4"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.002" to 0.004"	5/8"	1/16"	Silver	Black	Etched	0000000	000000


				6"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.002" to 0.004"	3/4"	5/64"	Silver	Black	Etched	0000000	00000
				6"	1/32" (4/32"), 1/64" (8/64")	1/50" (1/10"), 1/100" (1/10")	-0.002" to 0.004"	3/4"	5/64"	Silver	Black	Etched	0000000	00000
				12"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.0035" to 0.005"	1"	3/32"	Silver	Black	Etched	0000000	00000
				12"	1/32" (4/32"), 1/64" (8/64")	1/50" (1/10"), 1/100" (1/10")	-0.0035" to 0.005"	1"	3/32"	Silver	Black	Etched	0000000	000000
				24"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.0035" to 0.007"	1"	3/32"	Silver	Black	Etched	0000000	000000
				24"	1/32" (4/32"), 1/64" (8/64")	1/50" (1/10"), 1/100" (1/10")	-0.0035" to 0.007"	1"	3/32"	Silver	Black	Etched	0000000	000000
				36"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.0035" to 0.007"	1"	3/32"	Silver	Black	Etched	0000000	000000


				Inch/Metric







								Satin Chrome-Plated Steel

								11 3/4"/300 mm	0.5 mm (10 mm), 1/32" (4/32")	1 mm (10 mm), 1/64" (8/64")	-0.0035" to 0.005"/-0.09 mm to 0.15 mm	1"	3/32"	Silver	Black	Etched	0000000	000000


								23 1/2"/600 mm	0.5 mm (10 mm), 1/32" (4/32")	1 mm (10 mm), 1/64" (8/64")	-0.0035" to 0.007"/-0.11 mm to 0.25 mm	1"	3/32"	Silver	Black	Etched	0000000	000000

Starrett Scribing Compasses

Ensure accuracy when marking and measuring. Also known as dividers, these compasses have a strong, flexible bow spring that holds the legs in place.

	Mfr. Model No.		Each
Knurled-Nut Adjustment







	Steel

	3"	3"	Scribing Point	277-3	0000000	000000


	6"	6"	Scribing Point	277-6	0000000	00000

Edge Scribing Compasses

Mark and transfer distances from the outer edge of an object. An offset divider leg with adjustable point sits on the surface of an object while the outside-caliper style leg reaches around the edge.

Mfr. Model No.		Each







Steel

10 5/8"	6"	Scribing Point	243-6	0000000	000000

Starrett Expandable Beam Compasses

Transfer measurements and draw large, precise circles. These compasses have expandable point-holding clamps, also known as trammels, that securely grip the flat top of the beam. Adjust the scribing points with the knurled grip on the clamps. One clamp has a screw for making fine adjustments to ensure accuracy when marking and measuring.

	Includes	Mfr. Model No.		Each
Screw Adjustment







	Chrome-Plated Steel

	26"	Scribing Point	14 1/2"	Beam with Flattened Top, Caliper Legs	C251B	0000000	0000000

Starrett Swiveling Machine Tool Indicator Tip Sets

Determine tool spindle position in relation to work surface, layout lines, holes, and slots. Also known as wiggler sets. Attachments are interchangeable.

Includes	Material		Each
0.10" Diameter Disc Contact, 0.25" Ball Contact, Chuck, Needle Point, Offset Indicator Holder	Steel	0000000	000000

Starrett Edge Finders


Style A	Style B

Locate edges, shoulders, center points, and lines on your workpiece.

Style	Tip Shape (Tip Dia.)	Body Dia.	Overall Lg.	Mfr. Model No.	Material	Each
A	Barrel (0.2")	3/8"	2 1/2"	827A	Steel	000000
A	Barrel (6 mm)	10 mm	3 1/8"	827MA	Steel	00000
B	Barrel (0.2"), Point	1/2"	3 5/16"	827B	Steel	00000