Castle 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

	Tab Width Tab Width

	Overall Height Overall Height

	Tab Depth Tab Depth

	Container Features Container Features

	Countersink Angle Countersink Angle

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Fasteners

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.

Tooth Lock Washers

Teeth bite into the joint for a tighter grip than split lock washers.

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.)