Toothed lock Washers(external)	(JIS B 1255)
Internal type Approx.2t	External type Approx.2t

Unit:mm

Size-No.				ssrew size		d		D		t		Nos. of Teeth
Internal		External		m/m	Inch	Basic	Tol.	Basic	Tol.	Basic	Tol.	Internal	External
Aw	2	BW-	2	2	-	2.2	＋0.2 0	4.8	0 －0.3	0.3	0.025	7	8
	2.3		2.3	2.3	-	2.5		5.3		0.3		7	8
	2.5		2.5	2.5(2.6)	-	2.7		5.7		0.3		7	8
	3		3	3	-	3.2		6.5	0 －0.4	0.45	0.035	7	8
	3.5		3.5	3.5	-	3.7		7.5		0.45		8	8
	4		4	4	-	4.3		8.5		0.45		8	8
	4.5		4.5	4.5	-	4.8		9.5		0.5		8	8
	5		5	5	-	5.3		10		0.6	0.04	8	10
	6		6	6	-	6.4	＋0.3 0	11	0 －0.5	0.6		9	12
	7		-	7	-	7.4		13		0.8	0.05	10	-
	8		8	8		8.4		15		0.8		9	12
	3/8		3/8	-	3/8	9.8		17.5		0.9		9	12
	10		10	10	-	10.5	＋0.4 0	18		0.9		9	12
	7/16		7/16	-	7/16	11.4		19.5	0 －0.6	0.9		10	12
	12		12	12	-	12.5		21		1	0.055	10	12
	1/2		1/2	-	1/2	13		22.5		1		10	12
	14		14	14	-	14.5		23		1		10	12
	16		16	16	5/8	16.5		26		1.2	0.065	12	14
	18		18	18	-	19	＋0.5 0	29		1.2		12	14
	3/4		3/4	-	3/4	19.6		32	0 －0.8	1.2		12	14
	20		20	20	-	21		32		1.4	0.07	12	14
	22		22	22	7/8	23		35		1.4		14	16
	24		24	24	-	25		38		1.6	0.08	14	16
	1"		1"	-	1"	26		41		1.6		14	16

●Material= Carbon spring steel. Hardness=HRC40~50. Finish=Zn plating,Chromate dip.