• β = 15° to 30°
• Countersink at start of thread permissible

Dimensions of IS 1363-3 Hexagon Nuts Preferred Threads

Thread	pa	dw min	e min	m		mw min	s
				Max	Min		nom = Max	Min
M 5	0.8	6.7	8.63	5.6	4.4	3.5	8	7.64
M 6	1	8.7	10.89	6.4	4.9	3.7	10	9.64
M 8	1.25	11.5	14.2	7.9	6.4	5.1	13	12.57
M 10	1.5	14.5	17.59	9.5	8.0	6.4	16	15.57
M 12	1.75	16.5	19.85	12.2	10.4	8.3	18	17.57
M 16	2	22	26.17	15.9	14.1	11.3	24	23.16
M 20	2.5	27.7	32.95	19	16.9	13.5	30	29.16
M 24	3	33.3	39.55	22.3	20.2	16.2	36	35
M 30	3.5	42.8	50.85	26.4	24.3	19.4	46	45
M 36	4	51.1	60.79	31.9	29.4	23.2	55	53.8
M 42	4.5	60	71.3	34.9	32.4	25.9	65	63.1
M 48	5	69.5	82.6	38.9	36.4	29.1	75	73.1
M 56	5.5	78.7	93.56	45.9	43.4	34.7	85	82.8
M 64	6	88.2	104.86	52.4	49.4	39.5	95	92.8

Dimensions of IS 1363-3 Hexagon Nuts Non-Preferred Threads

Thread	pa	dw min	e min	m		mw min	s
				Max	Min		nom = Max	Min
M 14	2	19.2	22.78	13.9	12.1	9.7	21	20.16
M 18	2.5	24.9	29.56	16.9	15.1	12.1	27	26.16
M 22	2.5	31.4	37.29	20.2	18.1	14.5	34	33
M 27	3	38	45.2	24.7	22.6	18.1	41	40
M 33	3.5	46.6	55.37	29.5	27.4	21.9	50	49
M 39	4	55.9	66.44	34.3	31.8	25.4	60	58.8
M 45	4.5	64.7	76.95	36.9	34.4	27.5	70	68.1
M 52	5	74.2	88.25	42.9	40.4	32.3	80	78.1
M 60	5.5	83.4	99.21	48.9	46.4	37.1	90	97.8

Specification and reference standards

Material		Steel
General requirements	International Standard	ISO 8992
Thread	Tolerance	7H
	International Standards	ISO 724, ISO 965-1
Mechanical properties	Property classa	d ≤M 16:5 M 16 < d ≤ M39:4,5 d > M39: as agreed
	International Standard	d ≤ M39: ISO 898-2 d > M39: as agreed
Tolerances	Product grade	C
	International Standard	ISO 4759-1
Finish and/or coating		As processed Requirements for electroplating are covered in ISO 10683 If different electroplating requirements are desired or if requirements are needed for other finishes, they should be agreed between customer and supplier.
Acceptability		For acceptance procedure, see ISO 3269
For other property classes see ISO 898-2