Subject: burrs
Scope: Establish common practice for specifying acceptable limits for burrs on flat washers.

Requirement		Material thickness		Allowable burr
When deburring is not specified		.001-.004. 005-up		.000510% or thickness
When deburring is specified such as "must be burr free".		.001-.004. 005-.030. 031-up		.0003.0052% of thickness

Subject: flatness
Scope: Establish common practice for specifying acceptable limits for flatness on flat washers.

Measuring variation from flatness

Variation from flatness is measured by laying the part on a surface plate with the convex side up and measuring the maximum rise. The "roll over" one the edges of the washer is not to be measured.

Outside Diameter		Flat Within T.I.R.
.000-1.00		.010
1.001-up		.010/inch

Note: Washer faces shall be parallel within 0.002/inch

Parts that are relatively thin in relation to their outside diameter may be subjected to the following pressure when measuring flatness.

Material Thickness		Outside Diameter		Pressure (Ounces)
.001-.005		000-up		2
.006-.010		.500-up		4
.011-.020		1.000-up		8
.021-.030		2.000-up		16
.031-.040		3.000-up		25

Subject: measuring washer dimensions
Scope: Establish common inspection parameters.

Feature size:	This is to be measured only in the cut portion of the hole and cut portion of the outside diameter
Shear or burnished land:	This is a burnished area which is approximately one third of material thickness.
Break:	This is an area which is tapered about three degrees. This area has a rougher surface than the cut area.
Roll Over:	This is a natural consequence of the punching process and the mechanical properties of the material being punched and the die application techniques employed

Subject: O.D. and I.D tolerances and concentricity
Scope: To establish common practice for specifying tolerances of outside and inside diameters and concentricity of washers.

O.D. and I.D. tolerances

The below tolerances are based on ANSI B 27.2 1965 Type A.
			+	-
O.D.	.062 to .311		.000	.005
	.312 to .374		.008	.005
	.375 to .625		.015	.005
	.626 to .922		.015	.007
	.923 to 2.750		.030	.010
	2.751 to 5.000		.045	.010
	5.001 +		.065	.010
I.D.	.032 TO .124		.000	.005
	.125 to .249		.008	.005
	.250 to .625		.015	.005
	.626 to 1.500		.030	.007
	1.501 to 2.625		.045	.010
	2.626 +		.065	.010

Concentricity
	I.D.		Concentricity
	Range		In T.I.R
	.032 to .124		.005
	.125 to .249		.013
	.250 to .625		.020
	.626 to 1.500.		.037
	1.501 to 2.625		.055
	2.626 +		.075