5.5 mm Spacers | McMaster-Carr

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

	For Drill Bit Size For Drill Bit Size

5.5 mm

	Head Thickness Head Thickness

3 mm

	Head OD Head OD

13 mm

	Maximum Temperature Maximum Temperature

Less than 250° F

300° to 499° F

500° to 999° F

	Minimum Temperature Minimum Temperature

-49° to 0° F

Not Rated

	Installation Type Installation Type

	Permanent

	Drill Bushing Style Drill Bushing Style

Smooth

	Drill Bushing Type Drill Bushing Type

	Finish Finish

20 Products

About Washers

Steel

Compared to our general purpose washers, these have exaggerated diameters and/or thicknesses. Use them to cover oversized holes, hold heavy fastening loads, or as spacers and levelers.

Plain steel washers are stronger, more wear resistant, and less costly than zinc-plated steel and stainless steel washers. They should not be used in wet or corrosive environments because they easily rust.

Washers that meet DIN and ISO specifications, meet international standards for washer dimensions. ISO 8738 is formerly DIN 1440. ISO 7093 is formerly DIN 9021.

For technical drawings and 3-D models, click on a part number.

Steel
For Screw Size	ID, mm	OD, mm	Thick., mm	Hardness	Specifications Met	Pkg. Qty.		Pkg.
M5	5.5	18.0	1.7-2.3	Rockwell B50	DIN 440-R	100	000000000	000000

Metric General Purpose Washers

Steel

Use these metric washers to evenly distribute the load under bolt or screw heads and nuts when fastening. They can also act as spacers.

Stainless steel washers are more corrosion resistant than steel washers, and almost as strong. 18-8 and 17-7 PH stainless steel washers will hold up in humid, damp, and washdown environments, but will corrode if exposed to salt water or chemicals. 17-7 PH stainless steel washers are stronger than 18-8 stainless steel. Black-oxide 18-8 stainless steel washers have a matte-black finish. More corrosion resistant than 18-8 and 17-7 PH stainless steel, 316 stainless steel washers will not corrode from salt water, chlorine solutions, and chemicals. Stronger and slightly more corrosion resistant than 316 stainless steel, Bumax 109 stainless steel washers are best for marine environments and chemical-processing plants.

Steel washers are stronger and more wear resistant than stainless steel washers. Steel washers without a plating or coating are best for dry environments, since moisture will cause them to rust. Zinc-plated steel washers have an outer layer of zinc that protects the inner steel from rust and extends the life of the washer. Although they are stronger and more wear resistant than stainless steel, they are not as corrosion resistant. Use them in wet environments, but avoid contact with salt water and chemicals. Zinc-flake-coated and black corrosion-resistant-coated steel washers have the same level of corrosion resistance—both resist corrosion from chemicals and withstand 1,000 hours of salt spray. The black corrosion-resistant-coated steel washers have a black semi-gloss finish.

At one-third the weight of steel, aluminum washers are the lightest option. They will not rust in wet environments.

In addition to resisting rust in wet environments, copper and brass washers are electrically conductive.

Washers that meet ISO 7089, 7090, 7091, and 7092 (formerly DIN 125, 126, and 433), meet international standards for fastener dimensions. The ISO 7091 washers have a slightly rougher surface than a typical flat washer.

For technical drawings and 3-D models, click on a part number.

Steel
For Screw Size	ID, mm	OD, mm	Thickness, mm	Hardness	Specifications Met	Pkg. Qty.		Pkg.
M5	5.5	10.0	0.8-1.2	Rockwell B52	DIN 126; ISO 7091	100	000000000	00000

Metric Plastic Washers

These plastic washers are good electrical insulators.

Lubricant-filled nylon washers have a slippery surface that resists wear in high-friction applications.

Polycarbonate washers are more rigid than most plastic washers for high impact resistance. They have good moisture resistance and withstand oil, greases, and detergents.

For technical drawings and 3-D models, click on a part number.

				Temperature Range, °F
For Screw Size	ID, mm	OD, mm	Thick., mm	Min.	Max.	Hardness	Specifications Met	Pkg. Qty.		Pkg.
Lubricant-Filled Nylon Plastic
Gray
M5	5.5	10.0	0.9-1.1	Not Rated	220°	Rockwell M75	DIN 125	5	000000000	00000
Polycarbonate Plastic
Clear
M5	5.5	12.0	0.7-0.9	Not Rated	212°	Rockwell R120	__	50	000000000	00000

Metric High-Temperature Plastic Washers

Able to withstand temperatures as high as 450° or 500° F, these are among the most heat resistant plastic washers we carry. They have good resistance to moisture and chemicals.

PEEK washers have excellent tensile strength for high-stress applications.

Carbon-filled PEEK washers are stronger and more moisture resistant than PEEK washers.

Ultem PEI washers are flame retardant, UV stable, and can be used outdoors. They also offer excellent electrical-insulating properties.

For technical drawings and 3-D models, click on a part number.

				Temperature Range, °F
For Screw Size	ID, mm	OD, mm	Thick., mm	Min.	Max.	Hardness	Specifications Met	Choose a Color	Pkg. Qty.		Pkg.
PEEK Plastic
M5	5.5	10.0	0.9-1.1	-20°	500°	Rockwell M103	DIN 125	Beige, Black	10	000000000	00000
Carbon-Filled PEEK Plastic
M5	5.5	10.0	0.9-1.1	-20°	500°	Rockwell M103	DIN 125	Black	10	000000000	0000
Ultem PEI Plastic
M5	5.5	10.0	0.9-1.1	-30°	450°	Rockwell M114	DIN 125	Beige, Black	10	000000000	0000

Oversized Clipped Washers

Steel

Black-Oxide Steel

Zinc-Plated Steel

Stainless Steel

With greater diameters and/or thicknesses than general purpose washers, these washers cover oversized holes or act as spacers and levelers. Clipped to fit where standard washers can’t, they won’t rotate when you position the flat edge against a flat surface.

Black-oxide steel washers have mild corrosion resistance in dry environments.

Zinc-plated steel washers are corrosion resistant in wet environments.

18-8 stainless steel washers have good chemical resistance and may be mildly magnetic.

For technical drawings and 3-D models, click on a part number.

Steel
For Screw Size	ID	OD	Clipped Width	Thickness	Hardness	Pkg. Qty.		Pkg.
M5	5.500mm	18.000mm	14.900mm	0.900mm-1.100mm	Rockwell B55	10	000000000	000000
Black-Oxide Steel
M5	5.500mm	18.000mm	14.900mm	0.900mm-1.100mm	Rockwell B55	5	000000000	0000
Zinc-Plated Steel
M5	5.500mm	18.000mm	14.900mm	0.900mm-1.100mm	Rockwell B55	5	000000000	0000
18-8 Stainless Steel
M5	5.500mm	18.000mm	14.900mm	0.900mm-1.100mm	Rockwell B68	10	000000000	00000

Metric Split Lock Washers

Curved Steel

Curved

As you tighten a bolt, these metric washers flatten to add tension to the threaded joint and prevent loosening from small amounts of vibration. They meet a DIN or ASME standard for split lock washer dimensions.

Curved and wave split lock washers can be used with fasteners that have right- or left-hand threads to prevent clockwise and counterclockwise rotation. These washers are reusable—they retain their shape when untightened and will not damage fasteners. Steel washers are stronger and resist wear better than zinc-plated steel and stainless steel washers. Use them in dry environments.

For technical drawings and 3-D models, click on a part number.

Steel
For Screw Size	ID, mm	OD, mm	Thick., mm	Overall Ht., mm	Hardness	Specifications Met	Pkg. Qty.		Pkg.
Curved
M6	5.5	11.0	1.3	2.2	Rockwell C44	DIN 6905	50	000000000	000000

Metric Press-Fit Drill Bushings

Also known as jig bushings, these metric drill bushings fit inside fixture plate holes to 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. They also have internal chamfers, so it's easier to insert bits, pins, and punches into the bushing. Some bushings have internal chamfers on both ends, so no matter which end of the bushing is inserted into your jig, your bits, pins, and other tooling enter easily. Having an internal chamfer on the bottom of your bushing may cause shavings to get caught and bind as you remove the bit, however.

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.

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

For technical drawings and 3-D models, click on a part number.

				Tolerance								Each
OD, mm	Lg., mm	Internal Chamfer	For Drill Bit Size	ID, mm	OD, mm	Lg., mm	Drill Bushing Type	Material	Hardness	Specifications Met		1-5	6-11	12-Up
5.5 mm ID
10	10	Both Ends	5.5 mm	0.01 to 0.022	0.01 to 0.019	-0.2 to 0.2	PM	Steel	Rockwell C61	__	000000000	00000	00000	00000
10	10	One End	5.5 mm	0.01 to 0.022	0.01 to 0.019	-0.2 to 0.2	PM	Steel	Rockwell C61	DIN 179	000000000	0000	0000	0000
10	16	Both Ends	5.5 mm	0.01 to 0.022	0.01 to 0.019	-0.2 to 0.2	PM	Steel	Rockwell C61	__	000000000	00000	0000	0000
10	16	One End	5.5 mm	0.01 to 0.022	0.01 to 0.019	-0.4 to 0.4	PM	Steel	Rockwell C61	__	0000000	0000	0000	0000
10	20	One End	5.5 mm	0.01 to 0.022	0.01 to 0.019	-0.2 to 0.2	PM	Steel	Rockwell C61	DIN 179	000000000	00000	00000	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. A flanged head on the top of the bushing acts as a stop, preventing it from moving as you push down your drill bit, reamer, or other cutting bit. Drill bushings ensure accurate, consistent cuts and drilled holes from one part to the next. They sometimes also work as spacers, shims, and machinery bushings. Made of hardened, ground steel, these bushings hold their shape and resist wear over time. The flanged head protects your jig plate from damage caused by heavy use.

Although it's no longer an active standard, DIN 172 is still a common reference point for making sure parts are compatible with other parts and tools.

These bushings work in both countersunk and standard drill holes. To install, place the bushing inside the hole in your jig. A chamfered edge on the bottom of the bushing helps center the bushing in the hole. Once centered, press the bushing into the hole with a hydraulic or lever press.

For technical drawings and 3-D models, click on a part number.

		Head		Tolerance								Each
OD, mm	Lg., mm	OD, mm	Thick., mm	ID, mm	OD, mm	Lg., mm	Drill Bushing Type	Material	Hardness	Specifications Met		1-5	6-11	12-Up
5.5 mm ID
10	7	13	3	0.01 to 0.022	0.01 to 0.019	-0.2 to 0.2	H	Steel	Rockwell C61	DIN 172	000000000	000000	00000	00000
10	13	13	3	0.01 to 0.022	0.01 to 0.019	-0.2 to 0.2	H	Steel	Rockwell C61	DIN 172	000000000	00000	00000	0000
10	17	13	3	0.01 to 0.022	0.01 to 0.019	-0.2 to 0.2	H	Steel	Rockwell C61	DIN 172	000000000	00000	00000	00000

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About Washers

Metric Oversized Washers

Metric General Purpose Washers

Metric Plastic Washers

Metric High-Temperature Plastic Washers

Oversized Clipped Washers

Metric Split Lock Washers

Metric Press-Fit Drill Bushings

Metric Press-Fit Drill Bushings with Head