IS 1239-2Forged fittingsTG-DS-083 · Rev. 0 · October 2026

IS 1239 Part 2 Steel Pipe Fitting Dimensions

This chart gives IS 1239 (Part 2) mild steel pipe fitting dimensions in millimetres — sockets, equal and reducing elbows, tees and crosses, bends and springs, return bends and nipples for IS 1239 Part 1 tubes. These screwed fittings are the Indian standard for water, gas and general service pipework.

Teshi Group supplies IS 1239 fittings alongside its forged ASME B16.11 range.

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Section through a threaded elbow.

Key to dimensions

A: Centre to face (elbows, tees) — see each table for its own lettering

IS 1239 Part 2 Steel Pipe Fitting Dimensions — tables

IS 1239-2 Table 6 — steel (mild steel) sockets (mm)

Find a size

IS 1239-2 Table 6 — steel (mild steel) sockets (mm)
Nominal bore	Min outside diameter	Min length	Max inside dia of internal parallel thread
6	15	19	8.637
8	18.5	27	11.549
10	22	28	15.054
15	27	37	18.773
20	32.5	39	24.259
25	39.5	46	30.471
32	49	51	39.132
40	56	51	45.025
50	68	60	56.836
65	84	69	72.442
80	98	75	85.142
100	124	87	110.228
125	151	96	135.688
150	178	96	161.088

IS 1239-2 Table 8 — elbows, tees and crosses, equal (screwed) (mm)

IS 1239-2 Table 8 — elbows, tees and crosses, equal (screwed) (mm)
Nominal size	Min length, centre to face
6	16
8	22
10	24
15	32
20	35
25	43
32	51
40	52
50	64
65	76
80	89
100	115
125	140
150	160

IS 1239-2 Table 9 — elbows, reducing (screwed) (mm)

IS 1239-2 Table 9 — elbows, reducing (screwed) (mm)
Nominal size (large x small)	A min centre to face	B min centre to face
8 x 6	21	22
10 x 6	21	24
10 x 8	22	24
15 x 8	25	32
15 x 10	27	32
20 x 8	27	35
20 x 10	29	35
20 x 15	32	35
25 x 10	32	43
25 x 15	35	43
25 x 20	38	43
32 x 15	38	51
32 x 20	41	51
32 x 25	44	51
40 x 15	38	52
40 x 20	41	52
40 x 25	44	52
40 x 32	48	52
50 x 15	41	64
50 x 20	44	64
50 x 25	48	64
50 x 32	52	64
50 x 40	56	64
65 x 40	60	76
65 x 50	67	76
80 x 25	60	89
80 x 50	73	89
100 x 50	83	115
100 x 80	95	115

IS 1239-2 Table 4 — bends 90° and springs (mm)

IS 1239-2 Table 4 — bends 90° and springs (mm)
Nominal bore	Bend 90° A approx centre to face	B	R approx radius	Spring 112.5° C centre to face	Spring 135° D	Spring 157.5° E
6	51	73	32	48	44	44
8	64	92	41	60	57	54
10	73	105	48	67	64	60
15	86	127	57	79	76	73
20	102	143	73	92	89	86
25	121	168	89	108	105	102
32	146	197	108	133	127	124
40	165	219	127	149	143	140
50	203	264	159	181	175	168
65	248	321	197	222	213	206
80	292	371	232	260	248	241
100	381	467	308	340	324	318
125	540	632	460	476	457	444
150	622	718	540	572	540	527

IS 1239-2 Table 5 — return bends (mm)

IS 1239-2 Table 5 — return bends (mm)
Nominal bore	A approx centre to centre	B approx back to face
6	44	51
8	51	64
10	64	70
15	89	102
20	102	121
25	114	140
32	127	152
40	165	178
50	190	210
65	305	292
80	356	330
100	457	400
125	762	578
150	914	692

IS 1239-2 Table 2 — running, close taper and barrel nipples (mm)

IS 1239-2 Table 2 — running, close taper and barrel nipples (mm)
Nominal bore	Running nipple A	Close taper nipple B	Barrel nipple C
6	13	19	32
8	19	27	38
10	21	28	38
15	27	37	51
20	30	39	54
25	33	46	60
32	38	51	70
40	38	51	70
50	48	60	79
65	51	69	89
80	57	75	102
100	70	87	114
125	78	96	124
150	78	96	127

IS 1239-2 Table 28 — hexagon nipples, equal (mm)

IS 1239-2 Table 28 — hexagon nipples, equal (mm)
Nominal size	L basic gauge length + clearance	T hexagon thickness	A min overall length	C max bore	B width across flats
6	9.5	6	25	5.5	13.1
8	12.5	6	31	6.5	15.5
10	12.5	8	33	9.5	17.9
15	17.5	8	43	12.5	23.0
20	19	10	48	19	27.8
25	21	—	52	25	35.3
32	24	11	59	32	47.2
40	24	13	61	38	52.0
50	27	14	68	51	61.1
65	32	16	80	64	79
80	35	19	89	76	92
100	40	22	102	100	117
125	45	25	115	125	143
150	45	25	115	150	168

Notes

All dimensions are in millimetres; nominal sizes are nominal bore (mm).
Threads are to IS 554 (equivalent to BSP / ISO 7-1).
Values are nominal, compiled from published copies of the standard; blank cells (—) are values not confirmed from the sources available. Verify against the current edition before design, purchase or fabrication.

Reference information compiled from the published standard for convenience. It does not replace the current edition of the governing standard, which takes precedence. Verify critical dimensions and properties before design, purchase or fabrication. Teshi Engineers & Sales Promoters (P) Ltd accepts no liability for errors or omissions.

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IS 1239 Part 2 Steel Pipe Fitting Dimensions — size by size

Every size has its own page with a drawing, mm and inch values and a one-size PDF.

FAQ

IS 1239 Part 2 Steel Pipe Fitting dimensions: common questions

What threads do IS 1239 fittings use?

IS 1239 Part 2 fittings are threaded to IS 554, which matches BSP / ISO 7-1 taper pipe threads.

Does Teshi Group supply IS 1239 fittings?

Yes — IS 1239 Part 2 sockets, elbows, tees, bends and nipples, plain or galvanised, and forged ASME B16.11 fittings for higher pressures.

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