Heavy Hex Nut Dimensions in mm

Hexagonal Heavy-series nuts used with stud bolt. Heavy hex nut dimensions in inches are covered in ASME B18.2.2 Square and Hex Nuts; however, the dimensions in matrix unit are covered in ASME B18.2.4.6M Heavy Hex Nuts. I have listed the Heavy hex nut dimensions as per ISO and UNC.

ISO Heavy hex nut dimensions

ISO Nut NB	Across Corners	MAX Thickness	MIN Thickness	MAX Across Flats	MIN Across Flats
M 8	14.38	6.8	6.44	13	12.73
M 10	17.77	8.4	8.04	16	15.73
M 12	20.03	10.8	10.37	18	17.73
M 14	23.35	12.8	12.1	21	20.67
M 16	26.75	14.8	14.1	24	23.67
M 18	29.56	15.8	15.1	27	26.16
M 20	32.95	18	16.9	30	29.16
M 22	37.29	19.4	18.1	34	33
M 24	39.55	21.5	20.2	36	35
M 27	45.2	23.8	22.5	41	40
M 30	50.85	26.6	24.3	46	45
M 33	55.37	28.7	27.4	50	49
M 36	60.79	31	29.4	55	53.8
M 39	66.44	33.4	31.8	60	58.8
M 42	71.3	34	32.4	65	63.1
M 45	76.95	36	34.4	70	68.1
M 48	82.6	38	39.4	75	73.1
M 52	88.25	42	40.4	80	78.1
M 56	93.56	45	43.4	85	82.8
M 60	99.21	48	46.4	90	87.8
M 64	104.86	51	49.1	95	92.8
M 68	110.51	54	52.1	100	97.8
M 72 x 6	116.16	58	56.1	105	102.8
M 76 x 6	121.81	61	59.1	110	107.8
M 80 x 6	127.46	64	62.1	115	112.8

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UNC Heavy hex nut dimensions

UNC Nut N/B	Max Across Corners	Min Across Corners	Max Thickness	Min Thickness	Max Across Flats	Max Across Flats
3/8	20.2	19.4	9.6	8.7	17.5	17
7/16	22	21.1	11.2	10.2	19	18.5
1/2	25.6	24.6	12.8	11.8	22.2	21.6
9/16	27.5	26.3	14.4	13.4	23.8	23.1
5/8	31.2	29.8	16	14.9	27	26.2
3/4	36.7	35.1	19.3	18	31.8	30.8
7/8	42.2	40.4	22.5	21.2	36.5	35.4
1	47.7	45.6	25.7	24.3	41.3	40
1 1/8	53.2	50.8	28.9	27.4	46	44.6
1 1/4	58.6	56.1	31.8	30.1	50.8	49.2
1 3/8	64.2	61.4	35	33.3	55.6	53.8
1 1/2	69.6	66.6	38.2	36.4	60.3	58.4
1 5/8	75.2	71.8	41.5	39.5	65.1	63
1 3/4	80.6	77.1	44.7	42.6	69.9	67.6
1 7/8	86.2	82.3	47.9	45.8	74.6	72.2
2	91.6	87.6	51.1	48.9	79.4	76.8
2 1/4	102.6	98.1	57.2	54.7	88.9	86.1
2 1/2	113.6	108.6	63.6	61	98.4	95.2
2 3/4	124.6	119.1	70.1	67.2	108	104.4
3	135.6	129.6	76.5	73.5	117.5	113.7

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