β = 15° to 30°
Point shall be chamfered or for threads ≤ M4 may be as-rolled (sheared end)
Incomplete thread u ≤ 2P
Raferee datum for d_w
ds ≈ pitch diameter

Dimensions of IS 1364-2 Hexagon Head Screws - Preferred Threads

Thread (d)					M 1.6		M 2		M 2.5		M 3		M 4		M 5		M 6		M 8		M 10
pa					0.35		0.4		0.45		0.5		0.7		0.8		1		1.25		1.5
a				maxb	1.05		1.2		1.35		1.5		2.1		2.4		3		4		4.5
				min	0.35		0.4		0.45		0.5		0.7		0.8		1		1.25		1.5
c				max	0.25		0.25		0.25		0.40		0.40		0.50		0.50		0.60		0.60
				min	0.10		0.10		0.10		0.15		0.15		0.15		0.15		0.15		0.15
da max					2		2.6		3.1		3.6		4.7		5.7		6.8		9.2		11.2
dw		Product Grade		A min	2.27		3.07		4.07		4.57		5.88		6.88		8.88		11.63		14.63
				B min	2.3		2.95		3.95		4.45		5.74		6.74		8.74		11.47		14.47
e		Product Grade		A min	3.41		4.32		5.45		6.01		7.66		8.79		11.05		14.38		17.77
				B min	3.28		4.18		5.31		5.88		7.50		8.63		10.89		14.20		17.59
k		nom.			1.1		1.4		1.7		2		2.8		3.5		4		5.3		6.4
		Product Grade		A max	1.225		1.525		1.825		2.125		2.925		3.65		4.15		5.45		6.58
				A min	0.975		1.275		1.575		1.875		2.675		3.35		3.85		5.15		6.22
		Product Grade		B max	1.3		1.6		1.9		2.2		3.0		3.74		4.24		5.54		6.69
				B min	0.9		1.2		1.5		1.8		2.6		3.26		3.76		5.06		6.11
kwe		Product Grade		A min	0.68		0.89		1.10		1.31		1.87		2.35		2.70		3.61		4.35
				B min	0.63		0.84		1.05		1.26		1.82		2.28		2.63		3.54		4.28
r min					0.1		0.1		0.1		0.1		0.2		0.2		0.25		0.4		0.4
s		nom = max			3.20		4.00		5.00		5.50		7.00		8.00		10.00		13.00		16.00
		Product Grade		A min	3.02		3.82		4.82		5.32		6.78		7.78		9.78		12.73		15.73
				B min	2.90		3.70		4.70		5.20		6.64		7.64		9.64		12.57		15.57
Product grade
A			B
nom	min	max	min	max
2	1.8	2.2	-	-
3	2.8	3.2	-	-
4	3.76	4.24	-	-
5	4.76	5.24	-	-
6	5.76	6.24	-	-
8	7.71	8.29	-	-
10	9.71	10.29	-	-
12	11.65	12.35	-	-
16	15.65	16.35	-	-
20	19.58	20.42	18.95	21.05
25	24.58	25.42	23.95	26.05
30	29.58	30.42	28.95	31.05
35	34.5	35.5	33.75	36.25
40	39.5	40.5	38.75	41.25
45	44.5	45.5	43.75	46.25
50	49.5	50.5	48.75	51.25
55	54.4	55.6	53.5	56.25
60	59.4	60.6	58.5	61.50
65	64.4	65.6	63.5	66.50
70	69.4	70.6	68.5	71.50
80	79.4	80.6	78.5	81.50
90	89.3	90.7	88.25	91.75
100	99.3	100.7	98.25	101.75
110	109.3	110.7	108.25	111.75
120	119.3	120.7	118.25	121.75
130	129.2	130.8	128	132
140	139.2	140.8	138	142
150	149.2	150.8	148	152
160	-	-	158	162
180	-	-	178	182
200	-	-	197.7	202.3

Thread (d)					M 12		M 16		M 20		M 24		M 30		M 36		M 42		M 48		M 56		M 64
pa					1.75		2		2.5		3		3.5		4		4.5		5		5.5		6
b ref				maxa	5.3		6		7.5		9		10.5		12		13.5		15		16.5		18
				min	1.75		2		2.5		3		3.5		4		4.5		5		5.5		6
c				max	0.60		0.8		0.8		0.8		0.8		0.8		1.0		1.0		1.0		1.0
				min	0.15		0.2		0.2		0.2		0.2		0.2		0.3		0.3		0.3		0.3
da max					13.7		17.7		22.4		26.4		33.4		39.4		45.6		52.6		63		71
dw		Product Grade		A min	16.63		22.49		28.19		33.61		-		-		-		-		-		-
				B min	16.47		22		27.7		33.25		42.75		51.11		59.95		69.45		78.66		88.16
e		Product Grade		A min	20.03		26.75		33.53		39.98		-		-		-		-		-		-
				B min	19.85		26.17		32.95		39.55		50.85		60.79		71.3		82.6		93.56		104.86
k		nom.			7.5		10		12.5		15		18.7		22.5		26		30		35		40
		Product Grade		A max	7.68		10.18		12.715		15.215		-		-		-		-		-		-
				A min	7.32		9.82		12.285		14.785		-		-		-		-		-		-
		Product Grade		B max	7.79		10.29		12.85		15.35		19.12		22.92		26.42		30.42		35.5		40.5
				B min	7.21		9.71		12.15		14.65		18.28		22.08		25.58		29.58		34.5		39.5
kwe		Product Grade		A min	5.12		6.87		8.6		10.35		-		-		-		-		-		-
				B min	5.05		6.8		8.51		10.26		12.8		15.46		17.91		20.71		24.15		27.65
r min					0.6		0.6		0.8		0.8		1		1		1.2		1.6		2		2
s		nom = max			18.00		24.00		30.00		36.00		46		55.0		65.0		75.0		85.0		95.0
		Product Grade		A min	17.73		23.67		29.67		35.38		-		-		-		-		-		-
				B min	17.57		23.16		29.16		35.00		45		53.8		63.1		73.1		82.8		92.8
Product grade
A			B
nom	min	max	min	max
2	1.8	2.2	-	-
3	2.8	3.2	-	-
4	3.76	4.24	-	-
5	4.76	5.24	-	-
6	5.76	6.24	-	-
8	7.71	8.29	-	-
10	9.71	10.29	-	-
12	11.65	12.35	-	-
16	15.65	16.35	-	-
20	19.58	20.42	18.95	21.05
25	24.58	25.42	23.95	26.05
30	29.58	30.42	28.95	31.05
35	34.5	35.5	33.75	36.25
40	39.5	40.5	38.75	41.25
45	44.5	45.5	43.75	46.25
50	49.5	50.5	48.75	51.25
55	54.4	55.6	53.5	56.25
60	59.4	60.6	58.5	61.50
65	64.4	65.6	63.5	66.50
70	69.4	70.6	68.5	71.50
80	79.4	80.6	78.5	81.50
90	89.3	90.7	88.25	91.75
100	99.3	100.7	98.25	101.75
110	109.3	110.7	108.25	111.75
120	119.3	120.7	118.25	121.75
130	129.2	130.8	128	132
140	139.2	140.8	138	142
150	149.2	150.8	148	152
160	-	-	158	162
180	-	-	178	182
200	-	-	197.7	202.3

Dimensions of IS 1364-2 Non-Preferred Threads

Thread (d)					M 3.5		M 14		M 18		M 22		M 27
pa					0.6		2		2.5		2.5		3
a				maxa	13		34		42		50		60
				min	19		40		48		56		66
c				max	0.40		0.60		0.8		0.8		0.8
				min	0.15		0.15		0.2		0.2		0.2
da max					4.1		15.7		20.2		24.4		30.4
dw		Product Grade		A min	5.07		19.64		25.34		31.71		-
				B min	4.95		19.15		24.85		31.35		38
e		Product Grade		A min	6.58		23.36		30.14		37.72		-
				B min	6.44		22.78		29.56		37.29		45.2
k		nom.			2.4		8.8		11.5		14		17
		Product Grade		A max	2.525		8.98		11.715		14.215		-
				A min	2.275		8.62		11.285		13.785		-
		Product Grade		B max	2.6		9.09		11.85		14.35		17.35
				B min	2.2		8.51		11.15		13.65		16.65
kwe		Product Grade		A min	1.59		6.03		7.9		9.65		-
				B min	1.54		5.96		7.81		9.56		11.66
r min					0.1		0.6		0.6		0.8		1
s		nom = max			6.00		21.00		27.00		34.00		41
		Product Grade		A min	5.82		20.67		26.67		33.38		-
				B min	5.70		20.16		26.16		33.00		40
Product grade					ls and lg fg
A			B		ls	lg	ls	lg	ls	lg	ls	lg	ls	lg
nom	min	max	min	max	min	max	min	max	min	max	min	max	min	max
8	7.71	8.29	-	-
10	9.71	10.29	-	-
12	11.65	12.35	-	-
16	15.65	16.35	-	-
20	19.58	20.42	-	-
25	24.58	25.42	-	-
30	29.58	30.42	-	-
35	34.5	35.5	-	-
40	39.5	40.5	38.75	41.25
45	44.5	45.5	43.75	46.25
50	49.5	50.5	48.75	51.25
55	54.4	55.6	53.5	56.5
60	59.4	60.6	58.5	61.5
65	64.4	65.6	63.5	66.5
70	69.4	70.6	68.5	71.5
80	79.4	80.6	78.5	81.5
90	89.3	90.7	88.25	91.75
100	99.3	100.7	98.25	101.75
110	109.3	110.7	108.25	111.75
120	119.3	120.7	118.25	121.75
130	129.2	130.8	128	132
140	139.2	140.8	138	142
150	149.2	150.8	148	152
160	-	-	158	162
180	-	-	178	182
200	-	-	197.7	202.3

Thread (d)					M 33		M 39		M 45		M 52		M 60
pa					3.5		4		4.5		5		5.5
a				maxa	-		-		-		-		-
				min	78		90		102		116		-
c				max	0.8		1.0		1.0		1.0		1.0
				min	0.2		0.3		0.3		0.3		0.3
da max					36.4		42.4		48.6		56.6		67
dw			Product Grade	A min	-		-		-		-		-
				B min	46.55		55.86		64.7		74.2		83.41
e			Product Grade	A min	-		-		-		-		-
				B min	55.37		66.44		76.95		88.25		99.21
k			nom.		21		25		28		33		38
			Product Grade	A max	-		-		-		-		-
				A min	-		-		-		-		-
			Product Grade	B max	21.42		25.42		28.42		33.5		38.5
				B min	20.58		24.58		27.58		32.5		37.5
kwe			Product Grade	A min	-		-		-		-		-
				B min	14.41		17.21		19.31		22.75		26.25
r min					1		1		1.2		1.6		2
s			nom = max		50		60.0		70.0		80.00		90.0
			Product Grade	A min	-		-		-		-		-
				B min	49		58.8		68.1		78.1		87.8
Product grade					ls and lg fg
A			B		ls	lg	ls	lg	ls	lg	ls	lg	ls	lg
nom	min	max	min	max	min	max	min	max	min	max	min	max	min	max
8	7.71	8.29	-	-
10	9.71	10.29	-	-
12	11.65	12.35	-	-
16	15.65	16.35	-	-
20	19.58	20.42	-	-
25	24.58	25.42	-	-
30	29.58	30.42	-	-
35	34.5	35.5	-	-
40	39.5	40.5	38.75	41.25
45	44.5	45.5	43.75	46.25
50	49.5	50.5	48.75	51.25
55	54.4	55.6	53.5	56.5
60	59.4	60.6	58.5	61.5
65	64.4	65.6	63.5	66.5
70	69.4	70.6	68.5	71.5
80	79.4	80.6	78.5	81.5
90	89.3	90.7	88.25	91.75
100	99.3	100.7	98.25	101.75
110	109.3	110.7	108.25	111.75
120	119.3	120.7	118.25	121.75
130	129.2	130.8	128	132
140	139.2	140.8	138	142
150	149.2	150.8	148	152
160	-	-	158	162
180	-	-	178	182
200	-	-	197.7	202.3

Note :
Range of popular lengths between the solid, boldface stepped line :
for product grade A, above the dashed, stepped line;
for product grade B, below this stepped line;

• p is the pitch of the thread.
• Values in accordance with a_max normal series, in ISO 3508
• kw.min = 0.7 kmin

Specifications and reference standards

Material		Steel	Stainless steel	Non-ferrous metal
General Requirements	International Standard	ISO 8992
Thread	Tolerance	6g
	International Standards	ISO 724, ISO 965-1
Mechanical Properties	Property Classa	d <3 mm: as agreed 3mm ≤ d ≤ 39 mm: 5.6, 8.8, 9.8, 10.9 d > 39 mm: as agreed	d ≤ 24 mm: A2-70, A4-70 24mm < d ≤ 39 mm: A2-50, A4-50 d > 39 mm: as agreed	Materials specified in ISO 8839
	International Standard	d ≤ 39mm : ISO 898-1 d < 3mm and d > 39mm: as agreed	d ≤ 39mm : ISO 3506-1 d > 39mm: as agreed
Tolerances	Product grade	For d ≤ 24mm and l ≤ 10 d or 150mmb:A For d > 24mm or l > 10 d or 150mmb:B
	International Standard	ISO 4759-1
Finish and/or coating		As Processed Requirements for electroplating are converted in ISO 4042. Requirements for non-electrolytically applied zinc flake coatings are converted in ISO 10683 If different electroplating requirements are desired or if requirements are needed for other finishes, they should be agreed between custom and supplier. Limits for surface discontinuities are covered in ISO 6157-1	Plain	Plain Requirements for electroplating are covered in ISO 4042.
Acceptability		For acceptance procedure, see ISO 3269
a For other property classes see ISO 898-1 for steel and ISO 3506-1 for stainless steel respectively. b Whichever is shorter.