ASME B18.21.1 TABLE 12

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Dimensions in inches : source: ASME B18.21.1 type B Plain Washers table 12
Nominal Washer Size	Series	A basic	B basic	C basic
No. 0 (0.060)	N	0.068	0.125	0.025
	R	0.068	0.188	0.025
	W	0.068	0.25	0.025
No. 1 (0.073	N	0.84	0.156	0.025
	R	0.84	0.219	0.025
	W	0.84	0.281	0.025
No. 2 (0.086)	N	0.094	0.188	0.025
	R	0.094	0.250	0.032
	W	0.094	0.344	0.032
No. 3 (0.99)	N	0.109	0.219	0.025
	R	0.109	0.312	0.032
	W	0.109	0.406	0.040
No. 4 (0.112)	N	0.125	0.250	0.032
	R	0.125	0.375	0.040
	W	0.125	0.438	0.040
No. 5 (0.125)	N	0.141	0.281	0.032
	R	0.141	0.406	0.040
	W
No. 6 (0.138)
	R
	W
No. 8 (0.164)
	R
	W
No. 10 (0.190)
	R
	W
No. 12 (0.206)
	R
	W
1/4
	R
	W
5/16
	R
	W
3/8
	R
	W
7/16
	R
	W
1/2
	R
	W
9/16
	R
	W
5/8
	R
	W
3/4
	R
	W
7/8
	R
	W
1
	R
	W
1-1/8
	R
	W
1-1/4
	R
	W
1-3/8
	R
	W
1-1/2
	R
	W
1-5/8
	R
	W
1-3/4
	R
	W
1-7/8
	R
	W
2
	R
	W
2-1/4
	R
	W
2-1/2
	R
	W
2-3/4
	R
	W
3
	R
	W

Reproduced by permission of DIN Deutsches Institut für Normung e. V. The definitive version for the implementation of this standard is the edition bearing the most recent date of issue, obtainable from Beuth Verlag GmbH, Burggrafenstraße 6, 10787 Berlin, Germany.
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Standard ASME B18.21.1 TABLE 12