No. 12 Washers | McMaster-Carr

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System of Measurement

ID

OD

Material

Stainless Steel

Washer Type

Thickness

0.010" to 0.020"

0.013" to 0.020"

0.020" to 0.025"

0.020" to 0.026"

0.020" to 0.027"

0.025" to 0.035"

0.025" to 0.040"

0.025" to 0.055"

0.026" to 0.036"

0.027" to 0.035"

0.027" to 0.036"

Screw Size

Color

Finish

Corrosion-Resistant Coated

Zinc Yellow-Chromate Plated

Performance

Abrasion Resistant

Chemical Resistant

Corrosion Resistant

Electrically Insulating

Heavy Vibration Resistant

High Temperature

Impact Resistant

Moisture Resistant

Length

Washer Designation

General Purpose

Shape

Hardness

Specifications Met

Fastener Strength Grade/Class

Width

Overall Height

Export Control Classification Number (ECCN)

RoHS

Compliant with Exemptions

REACH

DFARS Specialty Metals

Diameter

Military Specification

Army-Navy Specification

Military Specification

Maximum Temperature

Less than 250° F

250° F to 299° F

300° F to 499° F

500° F to 999° F

1,000° F or greater

ASME Designation

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331 Products

Washers

General Purpose Washers

General Purpose Washers

Your go-to metal washer for every screw size

Oversized Washers

Oversized Washers

Exaggerated diameters and thicknesses to cover large holes or to create gaps

Mil. Spec. Washers

Mil. Spec. Washers

Adhere to U.S. military standards for material and construction

SAE Washers

Meet SAE sizing standards and typically have smaller diameters than USS washers

ASME Washers

Meet ASME standards and come in regular, narrow, and wide diameters

Plastic Washers

Plastic Washers

Lightweight, nonconductive, and naturally rust resistant

Hard Fiber Washers

Hard Fiber Washers

Least likely to scratch delicate mounting surfaces

Fiberglass Washers

Fiberglass Washers

Best strength-to-weight ratio of all our nonmetal washers

Ultra-High-Temperature Ceramic Washers

Ultra-High-Temperature Ceramic Washers

Withstand the highest temperatures of all our washers up to 3000° F

Easy-Install Slotted Washers

Easy-Install Slotted Washers

Slip under nuts and screws without having to disassemble them

Clipped Washers

Clipped Washers

Clipped on one side to fit in tight spots

Square Washers

Won't rotate as you fasten screws in slots and channels

Rectangular Washers

Rectangular Washers

Our narrowest washers to fit in thin channels, slots, and other tight spaces

Dished Washers

Cover oversized holes, such as the ends of pipe and tubes

Washers for Foam Insulation

Washers for Foam Insulation

Prevent screws from crushing insulation board

Other Products

Sealing Washers

Sealing Washers

Prevent fluids from leaking around fasteners

Lock Washers

Resist vibration to prevent fasteners from loosening

Finishing Washers

Finishing Washers

Screw heads sit flush to prevent snagging and to create a neat, finished appearance

Cushioning Washers

Cushioning Washers

Cushion joints to dampen vibration and protect them from wear

Spacers

Unthreaded to create space between two surfaces or objects, often to align them

Insulating Washers

Insulating Washers

Isolate screws from electrical current and prevent corrosion from mating different metals

Tie-Down Washers

Tie-Down Washers

Angled sides align and hold tie-down straps

Tag Washers

Bolt onto surfaces to mount tag rings and ties

Snap-In Nuts

Push into square holes in thin materials to add bolts for aligning off-center parts

Vibration-Damping Mounts

Vibration-Damping Mounts

Attach to machinery to reduce vibration and noise and extend service life

The quick brown fox jumped over the lazy dog. Pedestal (35" Ht. x 4" Wd. x 4" Dp.)