GOST 8966-75 Steel Connecting Parts with Cylindrical Thread for Pipelines P=1.6 MPa. Straight Sockets. Basic Dimensions

GOST 8966-75 applies to steel straight sockets with zinc coating and without coating, with cylindrical thread. The sockets are used for joining water and gas pipes with a sealant in heating, water supply, gas supply and other systems operating in non-aggressive media (water, saturated steam, combustible gas, etc.) at a medium temperature not exceeding 175 °C and pressure P=1.6 MPa.

The standard complies with ISO Recommendation R50.

STEEL CONNECTING PARTS WITH CYLINDRICAL THREAD FOR PIPELINES P=1.6 MPa. STRAIGHT SOCKETS. Basic dimensions	GOST 8966-75 Supersedes GOST 8966-59

The basic dimensions of sockets shall comply with those shown in the drawing and table.

Nominal bore Dy, mm	Thread d	L	S	Weight without coating, kg
		mm
8	1/4² pipe	25	3.5	0.023
10	3/8² pipe	26	3.5	0.036
15	1/2² pipe	34	4.0	0.067
20	3/4² pipe	36	4.0	0.086
25	1 1/4² pipe	43	5.0	0.163
32	1 1/2² pipe	48	5.0	0.220
40	1² pipe	48	5.0	0.255
50	2 ² pipe	56	5.5	0.409
65	2 1/2² pipe	65	6.0	0.663
80	3 ² pipe	71	6.0	0.838
100	4 ² pipe	83	8.0	1.801
125	5 ² pipe	92	8.0	2.374
(150)	6 ² pipe	92	10.0	3.560

Notes:

1. When sockets are manufactured from furnace-welded pipes, an increase in wall thickness, and correspondingly weight, of up to 25% is permitted.

2. Sockets with Dy values shown in brackets are manufactured upon customer request.

Examples of designations

Straight socket without coating with Dy=50 mm:

Socket 50 GOST 8966-75

The same, with zinc coating:

Socket 50-Ts GOST 8966-75

Sockets are manufactured in accordance with the requirements of GOST 8965-75.