Fastener Information

Metric Nut Sizes

Nut Size (mm)	Width across the Flats (mm)			Height (mm)

Nut Size (mm)	ISO*	DIN*	JIS*	Hex Nut	Jam Nut	Nylock Nut
2	4	4	4	1.6	1.2	-
2.5	5	5	5	2	1.6	-
3	5.5	5.5	5.5	2.4	1.8	4
4	7	7	7	3.2	2.2	5
5	8	8	8	4	2.7	5
6	10	10	10	5	3.2	6
7	-	-	11	5.5	3.5	-
8	13	13	12	6.5	4	8
10	16	17	14	8	5	10
12	18	19	17	10	6	12
14	21	22	-	13	7	14
16	24	24	-	13	8	16
18	27	27	-	15	9	18.5
20	30	30	-	16	10	20
These values differ from the ISO standard. * The DIN and JIS standards have been replaced by the ISO standard. However, the older DIN and JIS nut sizes, shown here, are still commonly used. ASME - American Society of Mechanical Engineers IFI - Industrial Fastener Institute ISO - International Organization for Standardization ANSI - American National Standards Institute DIN - Deutsches Institut fur Normung JIS - Japanese Industrial Standard

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