Metric Threads ISO 724

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Metric Threads ISO 724

ISO 724 - ISO general-purpose metric screw threads - Basic dimensions (DIN 13), the standard in Europe, is recognizable by its cylindrical outer and inner diameter and its precise outer diameter in millimeters.

Thread Dimensional Data

d = Basic Nominal Diameter
D₂ = Pitch Diameter Internal Thread
d₂ = Pitch Diameter External Thread
D₁ = Minor Diameter Internal Thread
d₁ = Minor Diameter External Thread
H = Height of Fundamental Thread Triangle
P = Pitch

The equations to calulate THread Dimensional Data:

ISO 724 Equation
Thread Equations ISO 724

ISO 724: The following is ISO general-purpose metric screw threads chart.

All chart data given in mm

Metric Screw Threads ISO 724
Nominal Diameter	Pitch	Root Radius	Pitch diameter	Minor Diameter		Thread Height		Tap Drill mm
Nominal Diameter	Pitch	Root Radius	Pitch diameter	External Thrd	Internal Thrd	Internal Thrd	External Thrd	Tap Drill mm
M 1.00	0.25	0.036	0.838	0.693	0.729	0.153	0.135	0.75
M 1.10	0.25	0.036	0.938	0.793	0.829	0.153	0.135	0.85
M 1.20	0.25	0.036	1.038	0.893	0.929	0.153	0.135	0.95
M 1.40	0.30	0.043	1.205	1.032	1.075	0.184	0.162	1.10
M 1.60	0.35	0.051	1.373	1.171	1.221	0.215	0.189	1.25
M 1.80	0.35	0.051	1.573	1.371	1.421	0.215	0.189	1.45
M 2.00	0.40	0.058	1.740	1.509	1.567	0.245	0.217	1.60
M 2.20	0.45	0.065	1.908	1.648	1.713	0.276	0.244	1.75
M 2.50	0.45	0.065	2.208	1.948	2.013	0.276	0.244	2.05
M 3.00	0.50	0.072	2.675	2.387	2.459	0.307	0.271	2.50
M 3.50	0.60	0.087	3.110	2.764	2.850	0.368	0.325	2.90
M 4.00	0.70	0.101	3.545	3.141	3.242	0.429	0.379	3.30
M 4.50	0.75	0.108	4.013	3.580	3.688	0.460	0.406	3.80
M 5.00	0.80	0.115	4.480	4.019	4.134	0.491	0.433	4.20
M 6.00	1.00	0.144	5.350	4.773	4.917	0.613	0.541	5.00
M 7.00	1.00	0.144	6.350	5.773	5.917	0.613	0.541	6.00
M 8.00	1.25	0.180	7.188	6.466	6.647	0.767	0.677	6.80
M 9.00	1.25	0.180	8.188	7.466	7.647	0.767	0.677	7.80
M 10.00	1.50	0.217	9.026	8.160	8.376	0.920	0.812	8.50
M 11.00	1.50	0.217	10.026	9.160	9.376	0.920	0.812	9.50
M 12.00	1.75	0.253	10.863	9.853	10.106	1.074	0.947	10.20
M 14.00	2.00	0.289	12.701	11.546	11.835	1.227	1.083	12.00
M 16.00	2.00	0.289	14.701	13.546	13.835	1.227	1.083	14.00
M 18.00	2.50	0.361	16.376	14.933	15.394	1.534	1.353	15.50
M 20.00	2.50	0.361	18.376	16.933	17.294	1.534	1.353	17.50
M 22.00	2.50	0.361	20.376	18.933	19.294	1.534	1.353	19.50
M 24.00	3.00	0.433	22.051	20.319	20.752	1.840	1.624	21.00
M 27.00	3.00	0.433	25.051	23.319	23.752	1.840	1.624	24.00
M 30.00	3.50	0.505	27.727	25.706	26.211	2.147	1.894	26.50
M 33.00	3.50	0.505	30.727	28.706	29.211	2.147	1.894	29.50
M 36.00	4.00	0.577	33.402	31.093	31.670	2.454	2.165	32.00
M 39.00	4.00	0.577	36.402	34.093	34.670	2.454	2.165	35.00
M 42.00	4.50	0.650	39.077	36.479	37.129	2.760	2.436	37.50
M 45.00	4.50	0.650	42.077	39.479	40.129	2.760	2.436	40.50
M 48.00	5.00	0.722	44.752	41.866	42.857	3.067	2.706	43.00
M 52.00	5.00	0.722	48.752	45.866	46.587	3.067	2.706	47.00
M 56.00	5.50	0.794	52.428	49.252	50.046	3.374	2.977	50.50
M 60.00	5.50	0.794	56.428	53.252	54.046	3.374	2.977	54.50
M 64.00	6.00	0.866	60.103	56.639	57.505	3.681	3.248	58.00
M 68.00	6.00	0.866	64.103	60.639	61.505	3.681	3.248	62.00