Star Washers | McMaster-Carr

	Tooth Location Tooth Location

	External
	Internal
	Internal/External

	System of Measurement System of Measurement

	For Screw Size For Screw Size

	Washer Type Washer Type

	Material Material

Stainless Steel

	Finish Finish

	ID ID

	OD OD

	Thickness Thickness

0.010" to 0.013"

0.010" to 0.015"

0.010" to 0.016"

0.012" to 0.018"

0.014" to 0.018"

0.014" to 0.020"

0.015" to 0.019"

0.016" to 0.018"

0.016" to 0.021"

0.016" to 0.022"

0.017" to 0.021"

0.018" to 0.023"

0.018" to 0.024"

0.020" to 0.025"

0.020" to 0.027"

0.023" to 0.027"

0.023" to 0.028"

0.027" to 0.031"

0.028" to 0.034"

0.032" to 0.040"

0.033" to 0.037"

0.034" to 0.044"

0.037" to 0.041"

0.037" to 0.045"

0.040" to 0.050"

0.042" to 0.050"

0.043" to 0.047"

0.047" to 0.055"

0.048" to 0.052"

0.052" to 0.060"

0.054" to 0.070"

0.059" to 0.067"

0.060" to 0.064"

0.073" to 0.083"

0.076" to 0.080"

0.15 to 0.25 mm

0.25 to 0.35 mm

0.35 to 0.45 mm

0.400 to 0.600mm

0.45 to 0.55 mm

0.5 to 0.600 mm

3.8 to 4.600 mm

	Specifications Met Specifications Met

	Hardness Hardness

Rockwell C40-50

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

DFARS Specialty Metals
Compliant

	Container Features Container Features

	Tab Width Tab Width

	Tab Depth Tab Depth

	Overall Height Overall Height

	Countersink Angle Countersink Angle

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Fasteners

External-Tooth Lock Washers

Teeth on the outside edge of the washer bite into the screw head and joint for a tight grip. Use with fasteners that have heads large enough to make contact with the teeth, such as pan, button, and binding head screws.

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.

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.

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. They minimize loosening from wear, temperature changes, and vibration.

Lock Washer Assortments

Lock Washer Assortments

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

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