McMaster-Carr

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	System of Measurement System of Measurement

Inch

Metric

	For Screw Size For Screw Size

	Material Material

	Finish Finish

Hot-Dipped Galvanized

Chrome Plated

Blue Dyed

	Washer Type Washer Type


Countersunk	Flat

Cup for Oversized Holes	Square-Neck Bolt Lock

	OD OD

	ID ID

	Countersink Angle Countersink Angle

82Â°

90Â°

100Â°

	Minimum Thickness Minimum Thickness

	Maximum Thickness Maximum Thickness

	Hardness Hardness

	Overall Height Overall Height

	Color Color

	Black
	Off-White

	Specifications Met Specifications Met

DIN

ISO

ASME

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727 Products

Washers

Metal Countersunk Washers

Metal washers provide the strongest bearing surface.

Plastic Countersunk Washers

Plastic washers are good electrical insulators.

Finishing Countersunk Washers

Also known as dress washers, these are machined to be sturdier and provide a neater appearance than standard countersunk washers.

Washers

Includes a variety of metal and nonmetal conventional flat washers.

Cup Washers for Oversized Holes

Cover oversized holes and the ends of tubes and pipe with these cup-shaped washers.

Lock Washers

These washers have a locking feature to resist loosening from vibration.

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