Pipe Thread Dimensions Table: Standard Sizes & Measurements

September 8, 2023 / By Shane / 1 minute of reading

Basic Dimension Table for Pipe Threads

Basic Dimension Table for Pipe Threads

Unit: mm

Dimension Code	Number of Teeth per 25.4mm, n	Pitch, p	Tooth Height, h	Approximate Radius of Arc, r≈	Basic Diameter on the Datum			Datum Distance	Effective Thread Length
Dimension Code	Number of Teeth per 25.4mm, n	Pitch, p	Tooth Height, h	Approximate Radius of Arc, r≈	Major Diameter (Datum Diameter), d=D	Median Diameter, d2=D2	Minor Diameter, d1=D1	Datum Distance	Effective Thread Length
1/16	28	0.907	0.581	0.125	7.723	7.142	6.561	4.0	6.5
1/8	28	0.907	0.581	0.125	9.728	9.147	8.566	4.0	6.5
1/4	19	1.337	0.586	0.184	13.157	12.301	11.445	6.0	9.7
3/8	19	1.337	0.586	0.184	16.662	15.806	14.950	6.4	10.1
1/2	14	1.814	1.162	0.249	20.955	19.793	18.631	8.2	13.2
3/4	14	1.814	1.162	0.249	26.441	25.279	24.117	9.5	14.5
1	11	2.309	1.479	0.317	33.249	31.770	30.291	10.4	16.8
1.1/4	11	2.309	1.479	0.317	41.910	40.431	38.952	12.7	19.1
1.1/2	11	2.309	1.479	0.317	47.803	46.324	44.845	12.7	19.1
2	11	2.309	1.479	0.317	59.614	58.135	56.656	15.9	23.4
2.1/2	11	2.309	1.479	0.317	75.184	73.705	72.226	17.5	26.7
3	11	2.309	1.479	0.317	87.884	86.405	84.926	20.6	29.8
3.1/2	11	2.309	1.479	0.317	100.330	98.851	97.372	22.2	31.4
4	11	2.309	1.479	0.317	113.030	111.551	110.072	25.4	35.8
5	11	2.309	1.479	0.317	138.430	136.951	135.472	28.6	40.1
6	11	2.309	1.479	0.317	163.830	162.351	160.872	28.6	40.1

Basic Dimensions Table for Conical Pipe Threads

Dimension Code	Number of Teeth per 25.4mm, n	Basic Diameter on the Datum			Datum Distance
Dimension Code	Number of Teeth per 25.4mm, n	Major Diameter (Datum Diameter), d=D	Median Diameter, d2=D2	Minor Diameter, d1=D1	Datum Distance
1/16	27	7.895	7.142	6.389	4.064
1/8	27	10.242	9.489	8.736	4.102
1/4	18	13.616	12.487	11.358	5.786
3/8	18	17.055	15.926	14.797	6.096
1/2	14	21.223	19.772	18.321	8.128
3/4	14	26.568	25.117	23.666	8.611
1	11.5	33.228	31.461	29.694	10.160
1.1/4	11.5	41.985	40.218	38.451	10.668
1.1/2	11.5	48.054	46.287	44.520	10.668
2	11.5	60.092	58.325	56.558	11.074
2.1/2	8	72.699	70.159	67.619	17.323
3	8	88.608	86.068	83.528	19.456
3.1/2	8	101.316	98.776	96.236	20.853
4	8	113.973	111.433	108.893	21.438

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Shane

As the founder of MachineMfg, I have dedicated over a decade of my career to the metalworking industry. My extensive experience has allowed me to become an expert in the fields of sheet metal fabrication, machining, mechanical engineering, and machine tools for metals. I am constantly thinking, reading, and writing about these subjects, constantly striving to stay at the forefront of my field. Let my knowledge and expertise be an asset to your business. Follow me at Facebook, Twitter

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