McMaster-Carr

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	System of Measurement System of Measurement

Inch

Metric

	For Screw Size For Screw Size	Show

7/16"

	For Screw Size For Screw Size	Hide

	Material Material

	Finish Finish

Black Oxide

Black Phosphate

Black Ultra-Corrosion-
Resistant Coated

Cadmium Plated

Chrome Plated

Hot-Dipped Galvanized

Nickel Plated

Nickel-Chrome Plated

Passivated

Yellow-Chromate Plated

Zinc Plated

Zinc Yellow-Chromate
Plated

Zinc-Aluminum Coated

Zinc-Flake Coated

	Washer Type Washer Type


Flat	Split Lock

Metal Bonded	Tooth Lock

Square	Sleeve

Spring Lock	Wave

Wedge Lock	Self-Retaining

Slotted

	ID ID

	OD OD

	Thickness Thickness

0.01"

0.013" to 0.019"

0.014" to 0.016"

0.015"

0.021" to 0.041"

0.022" to 0.042"

0.026" to 0.036"

0.028" to 0.034"

0.028" to 0.036"

0.029" to 0.035"

0.032" to 0.040"

0.035"

0.045" to 0.055"

0.047" to 0.109"

0.048" to 0.054"

0.050" to 0.080"

0.051"

0.051" to 0.080"

0.052" to 0.072"

0.053" to 0.073"

0.054" to 0.074"

0.055" to 0.065"

0.055" to 0.069"

0.056" to 0.071"

0.057" to 0.067"

0.057" to 0.069"

0.057" to 0.075"

0.058" to 0.070"

0.059" to 0.067"

0.060" to 0.067"

0.064" to 0.080"

0.064" to 0.104"

0.068" to 0.088"

0.071" to 0.091"

0.073" to 0.083"

0.075" to 0.081"

0.080" to 0.100"

0.084" to 0.104"

0.089" to 0.099"

0.090" to 0.110"

0.090" to 0.112"

0.099" to 0.119"

0.105" to 0.130"

0.109"

0.110" to 0.126"

0.110" to 0.140"

0.12"

0.14"

0.151" to 0.161"

0.168" to 0.193"

0.170" to 0.190"

0.170" to 0.200"

0.235" to 0.265"

0.359" to 0.391"

0.365" to 0.385"

	Fastener Strength Grade/Class Fastener Strength Grade/Class

Grade 8

Grade 9

	Specifications Met Specifications Met

ASME

Mil. Spec.

NAS

SAE

USS

	Hardness Hardness

	Color Color

	Off-White		Black
	White		Gray
	Clear		Red
	Tan		Brown

	Maximum Temperature Maximum Temperature

	Minimum Temperature Minimum Temperature

-249° to -100° F

-49° to 0° F

Not Rated

	Overall Height Overall Height

	Slot Width Slot Width

17/32"

	Tooth Location Tooth Location

	External
	Internal
	Internal/External

	ASME Designation ASME Designation

Narrow

Wide

Regular

	Sleeve OD Sleeve OD

0.528"

0.570"

	Width Width

2.000"

	Seal Material Seal Material

Buna-N Rubber

Silicone Rubber

	Slot Depth Slot Depth

7/8"

1 3/16"

	Maximum Pressure for Fluids Maximum Pressure for Fluids

Less than 3,000 psi

3,000 to 3,999 psi

4,000 to 5,999 psi

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167 Products

About Washers

General Purpose Washers

Oversized Washers

Compared to our general purpose washers, these have exaggerated diameters and/or thicknesses for covering oversized holes or for use as spacers and levelers.

Mil. Spec. Washers

Choose these washers for their adherence to strict military standards for material and construction.

SAE Washers

SAE washers generally have a smaller ID and OD than USS washers.

USS Washers

USS washers generally have a larger ID and OD than SAE washers.

ASME Washers for Soft Material

Also known as Type B washers, these distribute your fastener's load over a larger surface area than other washers to minimize damage to soft materials.

Plastic Washers

Mil. Spec. Plastic Washers

Choose these washers for their adherence to strict military standards for material and construction.

Mil. Spec. Chemical-Resistant
Plastic Washers

Choose these washers for their adherence to strict military standards for material and construction.

Electrical-Insulating Plastic Washers

Water- and Steam-Resistant
Plastic Washers

Low moisture absorption and good heat resistance make these washers suitable for wet and harsh environments.

High-Temperature Plastic Washers

These washers can withstand temperatures up to 500° F without degrading.

Extreme-Temperature
Ceramic Washers

These washers hold up in blistering temperatures up to 3000° F.

Square Washers

Square washers fit into slots and channels and have flat sides to keep them from rotating.

Self-Retaining Washers

A specially shaped ID grips your screw shank tightly.

Easy-Install Slotted Washers

A slot in the side allows you to install and remove these washers without completely disassembling your joint.

Sleeve Washers for Soft Material

Reinforce holes in soft material to keep them from collapsing around screws.

Lock Washers

Split Lock Washers

As a screw is tightened, these washers flatten to add tension to the joint and prevent loosening from small amounts of vibration.

Mil. Spec. Split Lock Washers

Choose these washers for their adherence to strict military standards for material and construction.

Split Lock Washers for
Socket Head Screws

External-Tooth Lock Washers

Teeth on the outside edge of the washer bite into the screw head and joint for a tight grip.

Internal-Tooth Lock Washers

Internal teeth dig into the screw head while the smooth outside edge won't snag objects. Use with fasteners that have small heads, such as fillister and cheese head screws.

Mil. Spec. Internal-Tooth
Lock Washers

Choose these washers for their adherence to strict military standards for material and construction.

Internal-/External-Tooth
Lock Washers

The combination of internal and external teeth boosts gripping power to maintain a tight hold and provide more vibration resistance than other tooth lock washers. Use with fasteners that have heads large enough to make contact with the external teeth, such as pan, button, and binding head screws.

Belleville Spring Lock Washers
for Socket Head Screws

These washers have smaller outside diameters than standard spring lock washers to fit neatly under socket head cap screws.

Belleville Spring Lock Washers

Also known as conical washers, these have a slightly cupped shape that gives them spring-like flexibility to grip tighter than split and tooth lock washers.

Wedge Lock Washers

Also known as NORD-LOCK® washers, these two-piece washers provide more locking power than split, tooth, and spring lock washers. Wedges on the inside lock the two pieces together, and serrations on the exterior grip surfaces to resist loosening from high vibration and shifting.

Pressure-Rated Metal-Bonded Sealing Washers

High-Pressure-Rated
Metal-Bonded Sealing Washers

Able to withstand pressure greater than 3,000 psi, these one-piece bonded washers create the tightest seals.

Pressure-Rated Metal-Bonded
Sealing Washers

These washers are rated to withstand pressure up to 100 psi.

Pressure-Rated Metal-Bonded
Sealing Washers
for Nuts and Washers

Also known as thread-sealing washers, use these under nuts and other washers.

Triple-Wave Washers

With three points of surface contact, these washers provide more stability than single-wave washers.

Polished Unthreaded Spacers

With their mirror-like finish, these are the go-to spacers when appearance matters.

Round Push Nuts

With flexible teeth that slide smoothly over threads of any pitch, these push nuts can be used alone for light-duty applications or as a jam nut.

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About Washers

Washers

General Purpose Washers

Oversized Washers

Mil. Spec. Washers

SAE Washers

USS Washers

ASME Washers for Soft Material

Plastic Washers

Mil. Spec. Plastic Washers

Mil. Spec. Chemical-ResistantPlastic Washers

Electrical-Insulating Plastic Washers

Water- and Steam-ResistantPlastic Washers

High-Temperature Plastic Washers

Extreme-TemperatureCeramic Washers

Square Washers

Self-Retaining Washers

Easy-Install Slotted Washers

Sleeve Washers for Soft Material

Lock Washers

Split Lock Washers

Mil. Spec. Split Lock Washers

Split Lock Washers forSocket Head Screws

External-Tooth Lock Washers

Internal-Tooth Lock Washers

Mil. Spec. Internal-ToothLock Washers

Internal-/External-ToothLock Washers

Belleville Spring Lock Washersfor Socket Head Screws

Belleville Spring Lock Washers

Wedge Lock Washers

Pressure-Rated Metal-Bonded Sealing Washers

High-Pressure-RatedMetal-Bonded Sealing Washers

Pressure-Rated Metal-BondedSealing Washers