McMaster-Carr

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

Standard split lock washers have a left-hand helix, which means you can only use them with bolts that have right-hand threads to prevent clockwise rotation from vibration. When tightened, their uneven split ends bite into unhardened nuts and bolts for a tighter hold than curved or wave washers, but only for applications with clockwise rotation. The washers, nuts, and bolts will be deformed when untightened, so none of them can be reused. Do not use these washers on hardened surfaces.

Curved and wave split lock washers can be used with bolts that have right- or left-hand threads to prevent clockwise or counterclockwise rotation from vibration. Although they don’t grip as tight as standard split lock washers for applications with clockwise rotation, they are best for those with counterclockwise rotation. These washers retain their shape when untightened and will not damage nuts and bolts, so all can be reused. Wave washers grip tighter than curved washers because they make contact with your surface at more points. Their wave design also means they compensate for uneven surfaces and tolerance variations.

Stainless steel washers are more corrosion resistant than steel, and nearly as strong. 18-8 stainless steel washers are good for humid, damp, and washdown environments, but will corrode when exposed to salt water and other chlorine solutions.

Use zinc-plated and yellow zinc-plated steel washers in mostly dry environments. The zinc plating offers temporary rust protection, but once it wears away the steel will rust. All of these washers are stronger and more wear resistant than stainless steel.

Steel washers are stronger and more wear resistant than zinc-plated steel and stainless steel. Use them in dry environments because they will rust in wet and corrosive environments. Blue-dyed steel washers are easy to spot. Black steel washers have a black residue that forms from being heat treated; the color will wear away over time.

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

18-8 Stainless Steel
For Screw Size	ID, mm	OD, mm	Thick., mm	Overall Ht., mm	Hardness	Specifications Met	Pkg. Qty.		Pkg.
Curved
M10	10.2	18.1	1.7	2.9	Not Rated	DIN 128A	50	000000000	00000
Zinc-Plated Steel
Curved
M10	10.2	18.1	1.7	2.9	Rockwell C44	DIN 128A	100	000000000	0000
Wave
M10	10.2	18.1	1.7	2.9	Rockwell C44	DIN 128B	50	000000000	0000
Yellow Zinc-Plated Steel
Curved
M10	10.2	18.1	1.7	2.9	Rockwell C44	DIN 128A	100	000000000	0000
Blue-Dyed Steel
Standard
M10	10.2	18.0	2.9	__	Rockwell C38	ASME B18.21.2M	50	000000000	0000
Black Steel
Curved
M10	10.2	18.1	1.7	2.9	Rockwell C44	DIN 128A	25	000000000	0000

Metal Sealing Washers

Also known as crush washers, these compress when tightened to form a tighter, more durable seal than rubber washers. They are commonly used to seal fluids such as oil and fuel. Washers are not reusable.

Copper washers are corrosion resistant in wet environments, nonmagnetic, and electrically conductive.

Aluminum washers are lightweight and corrosion resistant in wet environments.

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

Copper
For Screw Size	ID, mm	OD, mm	Thick., mm	Specifications Met	Pkg. Qty.		Pkg.
M10	10.2	13.9	0.8-1.2	DIN 7603	25	000000000	00000
M10	10.2	15.9	1.3-1.7	DIN 7603	25	000000000	00000
Aluminum
M10	10.2	13.9	0.8-1.2	DIN 7603	50	000000000	00000
M10	10.2	15.9	0.8-1.2	DIN 7603	50	000000000	00000

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
10.2 mm ID
18	12	Both Ends	10.2 mm	0.016 to 0.034	0.012 to 0.023	-0.2 to 0.2	PM	Steel	Rockwell C61	DIN 179	000000000	000000	00000	00000
18	12	One End	10.2 mm	0.016 to 0.034	0.012 to 0.023	-0.2 to 0.2	PM	Steel	Rockwell C61	DIN 179	000000000	00000	0000	0000
18	20	Both Ends	10.2 mm	0.016 to 0.034	0.012 to 0.023	-0.2 to 0.2	PM	Steel	Rockwell C61	DIN 179	000000000	00000	00000	00000
18	20	One End	10.2 mm	0.016 to 0.034	0.012 to 0.023	-0.2 to 0.2	PM	Steel	Rockwell C61	DIN 179	000000000	00000	00000	0000
18	25	Both Ends	10.2 mm	0.016 to 0.034	0.012 to 0.023	-0.2 to 0.2	PM	Steel	Rockwell C61	DIN 179	000000000	00000	00000	00000
18	25	One End	10.2 mm	0.016 to 0.034	0.012 to 0.023	-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
10.2 mm ID
18	8	22	4	0.016 to 0.027	0.012 to 0.023	-0.2 to 0.2	H	Steel	Rockwell C61	DIN 172	000000000	000000	000000	000000
18	16	22	4	0.016 to 0.027	0.012 to 0.023	-0.2 to 0.2	H	Steel	Rockwell C61	DIN 172	000000000	00000	00000	00000
18	21	22	4	0.016 to 0.027	0.012 to 0.023	-0.2 to 0.2	H	Steel	Rockwell C61	DIN 172	000000000	00000	00000	00000

Belleville Disc Springs

These conically shaped springs have the highest load ratings of any disc spring in our offering. They’re used on shafts, bolts, and the ends of valves to maintain tension and separate components. Unlike Belleville washers, they return to their original height once the load is removed.

Deflection is the distance a spring compresses under load. Flat load is the load at which the spring is completely compressed.

Springs may be stacked to increase working load and deflection. In a nested stack, working load is multiplied by the number of springs used, while deflection remains unchanged. In an inverted stack, deflection is multiplied by the number of springs used, while the working load remains unchanged. In a nested and inverted stack, both load and deflection are increased.

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

Metric

Stacking Configurations

For Shaft Dia., mm	ID, mm	OD, mm	Thick., mm	Ht., mm	Deflection @ Working Load, mm	Working Load, lbs.	Flat Load, lbs.	Material	Pkg. Qty.		Pkg.
10	10.2	20	0.4	0.9	0.375	22	23	Chrome-Vanadium Steel	12	000000000	00000
10	10.2	20	0.5	1.15	0.487	57	60	Chrome-Vanadium Steel	12	000000000	0000
10	10.2	20	0.9	1.45	0.412	236	297	Chrome-Vanadium Steel	12	000000000	0000
10	10.2	20	1.5	1.8	0.225	566	750	Chrome-Vanadium Steel	12	000000000	0000
10	10.2	28	1.25	2.25	0.75	538	652	Chrome-Vanadium Steel	12	000000000	0000

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About Washers

Metric Split Lock Washers

Metal Sealing Washers

Metric Press-Fit Drill Bushings

Metric Press-Fit Drill Bushings with Head

Belleville Disc Springs