Dimensions of Metric Flat Round Washers for High Strength Frict Grip Bolts

Nom Size	ø D1		ø D1		T
	Max	Min	Max	Min	Max	Min
M12	13.8	13.4	30.0	29.0	2.8	2.4
M16	17.8	17.4	37.0	36.0	3.4	3.0
M20	21.5	21.1	44.0	43.0	3.7	3.3
M22	23.4	23.0	50.0	48.5	4.2	3.8
M24	26.4	26.0	56.0	54.5	4.2	3.8
M27	29.4	29.0	60.0	58.5	4.2	3.8
M30	32.8	32.4	66.0	64.5	4.2	3.8
M33	35.8	35.4	75.0	73.5	4.6	4.2
M36	38.8	38.4	85.0	83.5	4.6	4.2

Metric Square Taper Washers for High Strength Frict Grip Bolts

Nom Size	T		ø D		A, Nom
	3° & 5° Taper, Nom	8° Taper, Nom	Max	Min
M12	4.76	6.35	14.2	13.4	31.75
M16	4.76	6.35	18.2	17.4	38.10
M20	4.76	6.35	21.9	21.1	38.10
M22	4.76	6.35	23.8	23.0	44.45
M24	4.76	6.35	26.8	26.0	57.15
M27	4.76	6.35	29.8	29.0	57.15
M30	4.76	6.35	33.2	32.4	57.15
M33	4.76	6.35	36.2	35.4	57.15
M36	4.76	6.35	39.2	38.4	57.15

Notes

• Sizes shown in brackets are non prefered
• Sizes M16 to M30 inclusive are common to BS4395 parts 1 and 2. Sizes M12 and M36 are to part 1 only. Size M33 is to Part 2 only.