ISO 228 - Pipe Threads Where Pressure Tight Joints Are Not Made ...

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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

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

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 55o.
• 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

• Dimensions of Pipes and Tubes

  Pipe, tube and fittings sizes and dimensions. Inside and outside diameters, weights and more.

• Threads

  Thread data - metric, unified, ACME and others.

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 Threads

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.

Piping Thread Standards

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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