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ISO 228 - Pipe Threads where Pressure Tight Joints are not made on the Threads

Requirements for thread form, dimensions, tolerances and designation for fastening pipe threads, thread sizes.

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The ISO 228 "Pipe Threads where Pressure-tight Joints are not made on the Threads" consists of the following parts:

ISO 228-1:2000 Dimensions, tolerances and designation
ISO 228-2:1987 Verification by means of limit gauges

G Size (in)	Major (Outside) Diameter (mm)	Minor (Nut) Diameter (mm)	Core Hole Diameter (mm)	Thread Count (TPI)	Thread Pitch (mm)
G Size (in)	Major (Outside) Diameter (mm)	Minor (Nut) Diameter (mm)	Core Hole Diameter (mm)	Thread Count (TPI)	Thread Pitch (mm)	G 1/8	9.73	8.85	8.80	28	0.907
G 1/4	13.16	11.89	11.80	19	1.337
G 3/8	16.66	15.39	15.25	19	1.337
G 1/2	20.95	19.17	19.00	14	1.814
G 5/8	22.91	21.13	21.00	14	1.814
G 3/4	26.44	24.66	24.50	14	1.814
G 7/8	30.20	28.42	28.25	14	1.814
G 1	33.25	30.93	30.75	11	2.309
G 1 1/8	37.90	35.58	35.30	11	2.309
G 1 1/4	41.91	39.59	39.25	11	2.309
G 1 3/8	44.32	42.00	41.70	11	2.309
G 1 1/2	47.80	45.48	45.25	11	2.309
G 1 3/4	53.74	51.43	51.10	11	2.309
G 2	59.61	57.29	57.00	11	2.309
G 2 1/4	65.71	63.39	63.10	11	2.309
G 2 1/2	75.18	72.86	72.60	11	2.309
G 2 3/4	81.53	79.21	78.90	11	2.309
G 3	87.88	85.56	85.30	11	2.309
G 3 1/4	93.98	91.66	91.50	11	2.309
G 3 1/2	100.33	98.01	97.70	11	2.309
G 3 3/4	106.68	104.30	104.00	11	2.309
G 4	113.03	110.71	110.40	11	2.309

TPI stands for Threads Per Inch and is a count of the mumber of threads per inch. TPI is used for American fasteners.
Thread pitch is the distance between the threads and is used for metric fasteners.
G-threads have a parallel shape in accordance with the DIN-EN-ISO 228-1 standard with flank angle 55^o.
G/R/Rp - Whitworth Pipe Threads (BSPP/BSPT)
ISO 7-1 Pressure Tight Thread Joints

Example - Typical designation for Thread according ISO 228

ISO 228 G 3 1/4"

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Related Topics

Threads - Thread data - metric, unified, ACME and others.
Dimensions - Sizes and dimensions of pipes and tubes, and their fittings - inside and outside diameter, weight and more.

Related Documents

ANSI B1.20.1 - NPT - American National Standard Taper Pipe Threads - NPT and NPTF pipe threads - dimensions according ANSI/ASME B1.20.1/3.
British Standard Brass Threads - British Brass Thread is an imperial unit based screw thread.
British Standard Cycle Thread - British Standard Cycle is a British Imperial screw thread standard.
BS 21 - Pressure Tight Pipe Thread Joints - BSPT - British Standard Pipe Taper threads & BSP or BSPF - British Standard Pipe Parallel (Straight) threads.
EN 10226 - Pipe Threads where pressure tight joints are made on the threads - Dimensions - Pipe threads where pressure tight joints are made on the threads - Part 1: Taper external threads and parallel internal threads.
ISO 7 - Pipe Threads where Pressure-tight Joints are made on the Threads - Pressure-tight joints made on the pipe threads.
ISO 724 - Metric Threads - Dimensions of metric threads according ISO 724.
Standards Applied for Piping Threads - Applied threaded standards used for piping connections.
Threads commonly used in Piping - Piping thread standards.
Whitworth Pipe Threads - BSPP (G) - British Standard Pipe Parallel and BSPT (R/Rp) – British Standard Tapered Pipe for pipes and tapered threads - G/R/Rp.
Withworth Threads - Taps and Drill Sizes - Taps and drill sizes used for Whitworth - ISO 7 and ISO 228 threads.

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Engineering ToolBox, (2018). ISO 228 - Pipe Threads where Pressure Tight Joints are not made on the Threads. [online] Available at: https://www.engineeringtoolbox.com/iso-228-pipe-threads-d_2037.html [Accessed Day Mo. Year].

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