Table 31: Dimensions of Taper Screw Plugs for Expansion Test

IS 1239 (Part 2):2011, Steel Tubes, Tubulars and Other Steel Fittings — Specification, Part 2 Steel Pipe Fittings

Last Updated 29 Oct 2026

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(Clauses 11.2.2.4 and 11.2.2.5)

All dimensions in millimetres.

	Nominal Bore (2)	Gauge Diameter (3)	Threads per 25.4 (4)	Tolerance on Total Number of Threads (5)	A (6)	B (7)	C (8)	D (9)
i)	6	9.728	28	2	1.8	13	11	7
ii)	8	13.157	19	2	2.8	19	13	10
iii)	10	16.662	19	2	2.8	19	16	13
iv)	15	20.955	14	2	3.6	25	19	14
v)	20	26.441	14	2	3.6	25	29	17
vi)	25	33.249	11	2	4.6	32	29	21
vii)	32	41.91	11	2	4.6	32	32	27
viii)	40	47.803	11	2	4.6	32	38	32
ix)	50	59.614	11	2	4.6	32	38	37
x)	65	75.184	11	2	4.6	32	51	48
xi)	80	87.884	11	2	4.6	32	57	54
xii)	100	113.03	11	2	4.6	32	64	70
xiii)	125	138.43	11	2	4.6	32	67	76
xiv)	150	163.83	11	2	4.6	32	70	89

Referenced by

IS 1239 (Part 2):2011, Steel Tubes, Tubulars and Other Steel Fittings — Specification, Part 2 Steel Pipe Fittings

Last Updated 29 Oct 2026

Hover any section to copy its link or text, ask Copilot about it, or bookmark it.

(Clauses 11.2.2.4 and 11.2.2.5)

All dimensions in millimetres.

	Nominal Bore (2)	Gauge Diameter (3)	Threads per 25.4 (4)	Tolerance on Total Number of Threads (5)	A (6)	B (7)	C (8)	D (9)
i)	6	9.728	28	2	1.8	13	11	7
ii)	8	13.157	19	2	2.8	19	13	10
iii)	10	16.662	19	2	2.8	19	16	13
iv)	15	20.955	14	2	3.6	25	19	14
v)	20	26.441	14	2	3.6	25	29	17
vi)	25	33.249	11	2	4.6	32	29	21
vii)	32	41.91	11	2	4.6	32	32	27
viii)	40	47.803	11	2	4.6	32	38	32
ix)	50	59.614	11	2	4.6	32	38	37
x)	65	75.184	11	2	4.6	32	51	48
xi)	80	87.884	11	2	4.6	32	57	54
xii)	100	113.03	11	2	4.6	32	64	70
xiii)	125	138.43	11	2	4.6	32	67	76
xiv)	150	163.83	11	2	4.6	32	70	89