45 cm Rulers | McMaster-Carr

Your go-to rulers for everyday measuring. Whether metal for durability or wood for a classic feel, our rulers measure up to most tasks, from woodwork to textiles to rough machining.

Corrosion-Resistant Stainless Steel

Our most corrosion-resistant rulers. These rulers won't rust when rinsed, rained on, or wiped down with degreasers or cleaning solutions. They're hardened to prevent dents and scratches, so you can trust they'll last for years to come. Etched and filled with black ink, their graduations won't rub off like printed graduations can.

Length—For easy handling and storage, rulers that are 96" or longer come in multiple pieces that line up to create a complete ruler.

						Rulers
	Lg.	Front Graduations (Numeric Graduations)	Back Graduations (Numeric Graduations)	Wd.	Thk.		Each
Inch/Metric







				Left-to-Right Reading Direction

				18"/450 mm	1/32" (1"), 1/64" (1")	1/32" (1"), 1 mm (1 cm)	1 1/4"	1/16"	0000000	00000

Stainless Steel with Antislip Backing


	Antislip Backing

A cork backing grips the surface beneath these rulers, preventing them from sliding around and scratching delicate material. Made of stainless steel, these rulers won't rust when splashed with water or wiped down with degreasers or cleaning solutions. They're hardened to prevent dents and scratches, so you can trust they'll last for years to come. Etched and filled with black ink, their graduations won't rub off like printed graduations can.

					Rulers
	Lg.	Front Graduations (Numeric Graduations)	Wd.	Thk.		Each
Inch/Metric







				Left-to-Right Reading Direction

				18"/450 mm	1/16" (1"), 1 mm (10 mm)	1 1/8"	1/16"	0000000	000000

Lightweight Aluminum

Our economical option. These rulers are about as lightweight as plastic rulers, so they're convenient to carry from site to site. Although light, they're not flimsy—they resist snapping if knocked around in your toolbox. Plus, they'll keep their bright finish if frequently rinsed.

Length—For easy handling and storage, 4 meter rulers come in two pieces that line up to create a complete ruler.

					Rulers
	Lg.	Front Graduations (Numeric Graduations)	Wd.	Thk.		Each
Inch/Metric







				Left-to-Right Reading Direction

				18"/45 cm	1 mm (1 cm), 1/16" (1")	1 3/8"	3/64"	0000000	00000


				Metric







								Left-to-Right Reading Direction

								45 cm	1 mm (1 cm), 1 cm (1 cm)	1 3/8"	3/64"	0000000	0000

High-Accuracy Rulers

With tolerances tight enough for machining detailed parts, these rulers are the most accurate we offer. They're also the most precise, with graduations as small as _1/64", so you can trust them for even the tiniest dimensions. Also known as machinists' rules.

All are precision made and etched in the U.S. to meet federal standards. Made of tempered steel for extra strength, they keep their shape even after multiple hard hits and drops, so they'll measure accurately for years to come. Their graduations are deeply engraved and blackened with ink, meaning they won't rub off like printed graduations can.

Satin Chrome-Plated Steel

Image of Product. Front orientation. Rulers. High-Accuracy Rulers, Chrome-Plated Steel.

Tough enough to handle most tasks, these rulers are chrome plated to resist rust. Their satin finish reduces glare for easy reading.

							Rulers
	Lg.	Front Graduations (Numeric Graduations)	Back Graduations (Numeric Graduations)	Accuracy	Wd.	Thk.		Each
Inch/Metric



		18"/450 mm	1/32" (4/32"), 1/64" (8/64")	0.5 mm (10 mm), 1 mm (10 mm)	-0.0035" to 0.006"/-0.09 mm to 0.15 mm	3/4"	1/64"	0000000	000000


		18"/450 mm	1/32" (4/32"), 1/64" (8/64")	0.5 mm (10 mm), 1 mm (10 mm)	-0.0035" to 0.006"/-0.09 mm to 0.15 mm	1 1/8"	3/64"	0000000	00000


		Metric



				450 mm	1 mm (10 mm), 0.5 mm (10 mm)	1 mm (10 mm), 0.5 mm (10 mm)	-0.09 mm to 0.15 mm	3/4"	1/64"	0000000	00000


				450 mm	1 mm (10 mm), 0.5 mm (10 mm)	1 mm (10 mm), 0.5 mm (10 mm)	-0.09 mm to 0.15 mm	1 1/8"	3/64"	0000000	00000

Center-Finding Rulers

Quickly locate the center of workpieces without any math. Just align these rulers so that the same measurement appears on both sides of the object—zero marks your center.

Corrosion-Resistant Stainless Steel

Image of Product. Front orientation. Rulers. Center-Finding Rulers.

These rulers won't rust when rinsed, rained on, or wiped down with degreasers or cleaning solutions. They're hardened to prevent dents and scratches, so you can trust they'll last for years to come. Etched and filled with black ink, their graduations won't rub off like printed graduations can.

						Rulers
	Lg.	Front Graduations (Numeric Graduations)	Back Graduations (Numeric Graduations)	Wd.	Thk.		Each
Inch/Metric







				Left-to-Right Reading Direction/Right-to-Left Reading Direction

				18"/45 cm	1/16" (1"), 1/16" (1")	1 mm (1 cm), 1 mm (1 cm)	1 1/4"	1/32"	0000000	000000

Vertical Rulers

No need to read sideways when measuring height and depth—the numbers on these rulers are printed from bottom to top or top to bottom.

Corrosion-Resistant Stainless Steel with Easy-Align Hook End

Similar to a tape measure, these rulers have a hook on one end to catch the edge of an object, keeping them straight as you measure. They're crafted from a single piece of metal, ensuring the hook always stays aligned with the scale.

Made of stainless steel, these rulers won't rust when rinsed, rained on, or wiped down with degreasers or cleaning solutions. They're hardened to prevent dents and scratches, so you can trust they'll last for years to come. Etched and filled with black ink, their graduations won't rub off like printed graduations can.

						Rulers
	Lg.	Front Graduations (Numeric Graduations)	Back Graduations (Numeric Graduations)	Wd.	Thk.		Each
Inch/Metric







				Top-to-Bottom Reading Direction

				18"/45 cm	1/32" (1"), 1 mm (1 cm)	1 mm (1 cm), 1/32" (1")	13/16"	1/32"	00000000	000000