SAE Flat Washers

Size	Inside Diameter	Outside Diameter	Thickness
#2	3/32"	1/4"	.020"
#4	1/8"	5/16"	1/32"
#6	5/32"	3/8"	3/64"
#8	3/16"	7/16"	3/64"
#10	7/32"	1/2"	3/64"
1/4	9/32"	5/8"	1/16"
5/16	11/32"	11/16"	1/16"
3/8	13/32"	13/16"	1/16"
7/16	15/32"	59/64"	1/16"
1/2	17/32"	1-1/16"	3/32"
9/16	19/32"	1-3/16"	3/32"
5/8	21/32"	1-5/16"	3/32"
3/4	13/16"	1-1/2"	9/64"
7/8	15/16"	1-3/4"	9/64"
1"	1-1/16"	2"	9/64"
1-1/8	1-3/16"	2-1/4"	9/64"
1-1/4	1-5/16"	2-1/2"	5/32"
1-1/2	1-7/16"	3"	3/16"
1-5/8	1-3/4"	3-3/4"	3/16"
1-3/4	1-7/8"	4"	3/16"
2	2-1/8"	4-1/2"	3/16"

USS Flat Washers

Size	Inside Diameter	Outside Diameter	Thickness
3/16	1/4"	9/16"	3/64"
1/4	5/16"	3/4"	1/16"
5/16	3/8"	7/8"	5/64"
3/8	7/16"	1"	5/64"
7/16	1/2"	1-1/4"	5/64"
1/2	9/16"	1-3/8"	7/64"
9/16	5/8"	1-1/2"	7/64"
5/8	11/16"	1-3/4"	9/64"
3/4	13/16"	2"	5/32"
7/8	15/16"	2-1/4"	1/64"
1	1-1/16"	2-1/2"	11/64"
1-1/8	1-1/4"	2-3/4"	11/64"
1-1/4	1-3/8"	3"	11/64"
1-3/8	1-1/2"	3-1/4"	3/16"
1-1/2	1-5/8"	3-1/2"	3/16"
1-5/8	1-3/4"	3-3/4"	3/16"
1-3/4	1-7/8"	4"	3/16"
2	2-1/8"	4-1/2"	3/16"
2-1/2	2-5/8"	4-1/2"	3/16"
3	3-1/8"	5-1/2"	9/32"

Size	Inside Diameter	Outside Diameter	Thickness
M1	1.1mm	3.2mm	0.3mm
M1.2	1.3mm	3.8mm	0.3mm
M1.4	1.5mm	3.8mm	0.3mm
M1.6	1.7mm	4.0mm	0.3mm
M2	2.2mm	5.0mm	0.3mm
M2.5	2.7mm	6.0mm	0.5mm
M3	3.2mm	7.0mm	0.5mm
M3.5	3.7mm	8.0mm	0.5mm
M4	4.3mm	9.0mm	0.8mm
M5	5.3mm	10mm	1mm
M6	6.4mm	12mm	1.6mm
M7	7.4mm	14mm	1.6mm
M8	8.4mm	16mm	1.6mm
M10	10.5mm	20mm	2.0mm
M11	12mm	24mm	2.5mm
M12	13mm	24mm	2.5mm
M14	15mm	28mm	2.5mm
M16	17mm	30mm	3.0mm
M18	19mm	34mm	3.0mm
M20	21mm	37mm	3.0mm