GOST 8969-75 Steel Connecting Parts with Cylindrical Thread for Pipelines P=1.6 MPa. Adapter Couplings. Basic Dimensions

Steel adapter couplings with cylindrical thread for pipelines P=1.6 MPa. Basic dimensions per GOST 8969-75.

STEEL CONNECTING PARTS WITH CYLINDRICAL THREAD FOR PIPELINES P=1.6 MPa. ADAPTER COUPLINGS Basic dimensions Pipe steel connections with cylindrical thread for pipelines P=1.6 MPa. Adapter couplings. Basic dimensions	GOST 8969-75 Supersedes GOST 8969-59

This standard applies to steel adapter couplings with cylindrical thread, zinc-plated and plain. Adapter couplings are used for connecting water and gas pipes with a sealant in heating, water supply, gas supply and other systems operating in non-aggressive media (water, saturated water vapor, combustible gas, etc.) at a medium temperature not exceeding 175 °C and pressure P=1.6 MPa.

The basic dimensions of adapter couplings correspond to those shown in the drawing and table.

Nominal bore Dy, mm	Thread d	l	l₁		L	Weight without coating, kg
			nom.	tolerance
		mm
8	1/4² pipe	7.0	38		80	0.04
10	3/8² pipe	8.0	42		90	0.062
15	1/2² pipe	9.0	40		110	0.094
20	3/4² pipe	10.5	45		110	0.134
25	1” pipe	11.0	50		130	0.243
32	1 1/4² pipe	13.0	55	+5	130	0.336
40	1 1/2² pipe	15.0	60		150	0.463
50	2 ² pipe	17.0	65		150	0.608
(65)	2 1/2² pipe	19.5	75		170	1.027
(80)	3 ² pipe	22.0	85		180	1.229

Notes:

1. Adapter couplings with Dy values shown in parentheses are made at the customer’s request.

2. At the customer’s request, the thread length may be reduced.

Examples of designations

Plain adapter coupling with Dy=40 mm:

Adapter coupling 40 GOST 8969-75

The same, with zinc coating:

Adapter coupling 40-Ts GOST 8969-75

Adapter couplings are manufactured in accordance with the requirements of GOST 8965-75 from pipes complying with GOST 3262-75 and GOST 10704-91.

Thread runout — per GOST 10549-80.