Dimensions for UNI 5715 Square taper washers for I-sections

Nominal Size	thread size	d		a			b			c		e	h			r	t	z	Approx mass (7.85kg/dm3) per 1000 unit in kg
		min= nominal	max	Nominal	min	max	Nominal	min	max	min=nominal	max		nom	min	max	approx	approx
13	M12	13	13.43	26	24	28	30	29.35	30.65	1.6	1.9	4.1	6.2	5	7.4	1.6	0.7	1.68	20.4
17	M16	17	17.43	32	29.5	34.5	36	35.2	36.8	1.6	1.9	5	7.5	6.3	8.7	2	0.8	2	35.7
21	M20	21	21.52	40	37.5	42.5	44	43.2	44.8	2	2.5	6.1	9.2	8	10.4	2.4	0.9	2	66.5
23	M22	23	23.52	44	41.5	46.5	50	49.2	50.8	2	2.5	6.5	10	8.8	11.2	2.4	1	2	59.8
25	M24	25	25.52	56	53	59	56	55.05	56.95	2	2.5	6.9	10.8	9.3	12.3	2.4	1	3.8	142
28	M27	28	28.52	56	53	59	56	55.05	56.95	2.5	3	6.9	10.8	9.3	12.3	2.4	1	3.8	134
31	M30	31	32	62	59	65	62	61.05	62.95	2.5	3	7.5	11.7	10.2	13.2	2.4	1	3.8	174
37	M36	37	38	68	65	71	68	67.05	68.95	3	3.5	8	12	11	14	2.4	1	3.8	210