5.5 mm Spacers | McMaster-Carr

All of these washers are lightweight, nonconductive, and naturally rust resistant. They are commonly used in electronics and automation applications to take the pressure off screws and nuts and protect mounting surfaces.

Low-Friction Lubricant-Filled Nylon—Reduce friction between the washer, fastener, and mounting surface to prevent sticking when tightening and loosening.

Clear Impact-Resistant Polycarbonate—Withstand bumps and vibration without cracking or denting. These washers are also clear to be less noticeable in your assembly.

High-Strength High-Temperature PEEK—These washers bear heavier loads than most other plastic washers. In addition, they won't melt or deform when exposed to high temperatures up to 550° F. PEEK washers aren't very impact resistant, however, so they may crack or dent if subjected to hard bumps and vibrations.

Extreme-Strength High-Temperature Carbon-Filled PEEK—Second only to phenolic in terms of strength, these washers stand up to high-stress applications. They won't melt or deform when exposed to high temperatures up to 500° F.

Electrical Insulating Ultem PEI—Our best electrical insulators, these washers are often used to secure components in circuit-breaker housings and semiconductors.

					Temp. Range
	For Screw Size	ID, mm	OD, mm	Thk., mm	Min.	Max., ° F	Specs. Met	Choose a Color	Pkg. Qty.		Pkg.
Low-Friction Lubricant-Filled Nylon



		M5	5.5	10.0	0.9 to 1.1	Not Rated	220	DIN 125	Gray	5	91545A440	00000


		Clear Impact-Resistant Polycarbonate



				M5	5.5	12.0	0.7 to 0.9	Not Rated	212	—	Clear	50	90940A414	00000


				High-Strength High-Temperature PEEK



						M5	5.5	10.0	0.9 to 1.1	-50° F	500	DIN 125	Black, Brown	10	93785A440	0000


						Extreme-Strength High-Temperature Carbon-Filled PEEK



								M5	5.5	10.0	0.9 to 1.1	-50° F	500	DIN 125	Black	10	93785A714	0000


								Electrical Insulating Ultem PEI



										M5	5.5	10.0	0.9 to 1.1	-30° F	450	DIN 125	Beige, Black	10	95331A400	0000

Oversized Washers

Cover oversized holes or use these washers as spacers and levelers. Compared to general purpose washers, these have a larger diameter or thickness.

Stainless Steel About Stainless Steel

Image of Product. Front orientation. Contains Annotated. Washers. Oversized Washers.

Image of Specification. Front orientation. Washers. Oversized Washers.

Highly Corrosion-Resistant 316 Stainless Steel—Superior to 18-8 stainless steel, these washers won't degrade when exposed to harsh weather, salt water, and most chemicals.

	ID, mm	OD, mm	Thk., mm	Specs. Met	Pkg. Qty.		Pkg.
Highly Corrosion-Resistant 316 Stainless Steel



	M5	5.5	18.0	1.7 to 2.3	DIN 440-R	25	95211A154	000000

Steel

Zinc-Plated Steel—A common choice for areas with occasional exposure to moisture.

Steel—Best for dry environments since moisture will cause these washers to rust.

	ID, mm	OD, mm	Thk., mm	Specs. Met	Pkg. Qty.		Pkg.
Zinc-Plated Steel



	M5	5.5	18.0	1.7 to 2.3	DIN 440-R	25	91100A313	000000


	Steel



			M5	5.5	18.0	1.7 to 2.3	DIN 440-R	100	98363A111	00000

Curved Spring Lock Washers

The curvy, spring-like shape adds a small amount of tension to prevent nuts and screws from backing out due to mild vibration. These washers also flex slightly to compensate for uneven surfaces. While more secure than a standard flat washer, these have the least amount of gripping power of all our lock washers. They are best suited for electrical panels, light fixtures, and other light duty assemblies. These washers hold their shape when untightened, so you can reuse them a handful of times without losing strength.

Steel—Best for dry environments since moisture will cause these washers to rust.

	ID, mm	OD, mm	Thk., mm	Overall Ht., mm	Specs. Met	Pkg. Qty.		Pkg.
Steel



	M6	5.5	11.0	1.3	2.2	DIN 6905	50	91169A316	000000

General Purpose Washers

Your go-to metal washer for every screw size. Washers take the pressure off nuts and screws to protect mounting surfaces.

Steel

Steel—Best for dry environments since moisture will cause these washers to rust.

	ID, mm	OD, mm	Thk., mm	Pkg. Qty.		Pkg.
Steel



	M5	5.5	10.0	0.8 to 1.2	100	98687A110	00000

Metric Press-Fit Drill Bushings with Head


Shown in Countersunk Hole	Shown in Standard Hole

Even under extreme drilling pressure, these metric bushings won't press through your jig plate. They’re ANSI Type H bushings, also known as headed bushings. A flanged head acts as a stop, so these bushings won’t move as you push down your drill bit, reamer, or other cutting bit. Use them even in jigs made of thin or soft materials—the head adds support to protect your jig from damage caused by heavy use. Drill bushings ensure accurate, consistent cuts and drilled holes from one part to the next. They’re also used as spacers, shims, and machinery bushings. Made of hardened, ground steel, these bushings hold their shape and resist wear, so they last for many cycles without needing to be replaced.

These bushings meet DIN 172 dimensional standards. This standard is no longer active, but it’s often used as a reference point for making sure parts are compatible with other parts and tools.

To install, fit the bushing into a hole in your jig. In a standard hole, the head will sit above the jig plate; to mount flush, install in a countersunk hole. A chamfered edge on the bottom of the bushing helps center the bushing in the hole. Once it’s centered, press the bushing into the hole with a hydraulic or lever press.

					Head, mm		Tolerance, mm								Each
	OD, mm	Lg., mm	For Drill Bit Size, mm	For Drill Bit Size Decimal Equiv.	OD	Thk.	ID	OD	Lg.	Drill Bushing Type	Material	Hardness	Specs. Met		1-5	6-11	12-Up
5.5 mm ID



		10	7	5.5	0.2165"	13	3	0.01 to 0.022	0.01 to 0.019	-0.2 to 0.2	H	Steel	Rockwell C61	DIN 172	96977A225	00000	00000	00000


		10	13	5.5	0.2165"	13	3	0.01 to 0.022	0.01 to 0.019	-0.2 to 0.2	H	Steel	Rockwell C61	DIN 172	96977A226	00000	0000	0000
		10	17	5.5	0.2165"	13	3	0.01 to 0.022	0.01 to 0.019	-0.2 to 0.2	H	Steel	Rockwell C61	DIN 172	96977A227	00000	00000	00000

Metric Press-Fit Drill Bushings

Also known as jig bushings, these metric drill bushings fit inside fixture plate holes to precisely guide drill bits, counterbores, reamers, and other cutting tools. They improve accuracy so that your drilled holes and cuts are consistent from part to part. Known for their versatility, drill bushings are also used as spacers, shims, and machinery bushings. These bushings are made of hardened, ground steel that holds its shape and resists wear, so they last for many cycles without needing to be replaced.

All bushings have a chamfer on the outside that centers the bushing as you place it into the hole. Press into place with a manual or hydraulic press. Since the bushing is sized slightly larger than the hole for an extremely tight fit, it’ll stay put permanently. These are ANSI Type PM bushings—also known as headless bushings—which means you don’t need to counterbore the hole to mount them flush.

They also have an internal chamfer that makes it easy to insert bits, pins, and punches without damaging the bushing or misaligning tools.

Don't see the size you need? Additional sizes are available.

Both Ends—Bushings with an internal chamfer on both ends allow you to insert tools no matter which end of the bushing is inserted into the jig. However, having an internal chamfer on the bottom of your bushing may cause shavings to get caught and bind as you remove the bit.

DIN 179—DIN 179 bushings meet dimensional and material standards that make sure they're compatible with other parts and tools. Although DIN 179 is no longer an active standard, it's still a common reference point for designers.

						Tolerance, mm
	OD, mm	Lg., mm	Internal Chamfer	For Drill Bit Size, mm	For Drill Bit Size Decimal Equiv.	ID	OD	Lg.	Drill Bushing Type	Material	Hardness	Specs. Met		Each
5.5 mm ID



		10	10	One End	5.5	0.2165"	0.01 to 0.022	0.01 to 0.019	-0.2 to 0.2	PM	Steel	Rockwell C61	DIN 179	96990A226	00000


		10	10	Both Ends	5.5	0.2165"	0.01 to 0.022	0.01 to 0.019	-0.2 to 0.2	PM	Steel	Rockwell C61	—	97060A151	0000
		10	16	One End	5.5	0.2165"	0.01 to 0.022	0.01 to 0.019	-0.2 to 0.2	PM	Steel	Rockwell C61	DIN 179	8486A361	0000
		10	16	Both Ends	5.5	0.2165"	0.01 to 0.022	0.01 to 0.019	-0.2 to 0.2	PM	Steel	Rockwell C61	—	97060A152	00000
		10	20	One End	5.5	0.2165"	0.01 to 0.022	0.01 to 0.019	-0.2 to 0.2	PM	Steel	Rockwell C61	DIN 179	96990A227	00000

Clipped Washers

Clipped on one side, these washers fit in tight spots where your typical round washers can't. Position them against a flat edge, and they won't rotate out of place as you tighten. Washers take the pressure off screws and nuts to protect mounting surfaces.

Stainless Steel About Stainless Steel

18-8 Stainless Steel—The choice for wet and outdoor environments, these washers resist rust. However, they won't hold up to the harsh chemicals that 316 stainless steel can.

	ID, mm	OD, mm	Clipped Wd., mm	Thk., mm	Pkg. Qty.		Pkg.
18-8 Stainless Steel



	M5	5.5	18.0	14.9	0.9 to 1.1	10	93409A133	000000

Steel

Zinc-Plated Steel—A common choice for areas with occasional exposure to moisture.

Black-Oxide Steel—Typically chosen for their appearance, these washers have a dark, matte coating that creates a finished look. They offer minimal corrosion resistance, so they're best for dry environments.

Steel—Best for dry environments since moisture will cause these washers to rust.

	ID, mm	OD, mm	Clipped Wd., mm	Thk., mm	Pkg. Qty.		Pkg.
Zinc-Plated Steel



	M5	5.5	18.0	14.9	0.9 to 1.1	5	91717A220	00000


	Black-Oxide Steel



			M5	5.5	18.0	14.9	0.9 to 1.1	5	91717A239	0000


			Steel



					M5	5.5	18.0	14.9	0.9 to 1.1	10	91717A134	00000