GOST 9064-75 Nuts for Flanged Connections with Medium Temperature from 0 to 650°C

Nuts for flanged connections with medium temperature from 0 to 650°C. Types and main dimensions are established by GOST 9064-75.

NUTS FOR FLANGED CONNECTIONS WITH MEDIUM TEMPERATURE FROM 0 TO 650°C Types and main dimensions Nuts for flanged connections with medium temperature from 0 to 650°C. Types and main dimensions	GOST 9064-75* Supersedes GOST 9064-69

The standard has been in effect since 01.01.76; its validity has been extended until 01.01.96.

This standard applies to hexagon and cap nuts for flanged connections of steam and gas turbines, steam boilers, pipelines and fittings, valves, instruments, apparatus and vessels with medium temperature from 0 to 650°C.

This standard does not apply to flanged connections of facilities under the jurisdiction of Gosgortekhnadzor of the USSR with nominal pressure P less than 4 MPa (40 kgf/cm²).

Nuts are manufactured in the following types:

A — hexagon nut for flanged connections of cylinder housings of steam and gas turbines, pipelines and fittings, steam boilers, valves, instruments, apparatus and vessels;

B — cap nut for flanged connections of cylinder housings of steam and gas turbines, stop and control valves, and other connections of steam boilers, steam and gas turbines.

Nut dimensions correspond to those shown in Fig. 1 and 2 and in the table.

Type A (Fig. 1), type B (Fig. 2), mm.

Nominal thread diameter d		10	12	16	20	(22)	24	(27)	30	36	42	48	(52)	56	(60)	64	(68)	72	(76)	80	90	100	110	(120)	125	140	160
Thread pitch	coarse	1.5	1.75	2.0	2.5		3.0		3.5	4.0	4.5	5.0		5.5		6.0		-	-	-	-	-	-	-	-	-	-
	fine	1.25		1.5			2.0			3.0				4.0				4.0 and 6.0
Width across flats for type A	S	17	19	24	30	32	36	41	46	55	65	75	80	85	90	95	100	105	110	115	130	145	155	175	180	200	225
	Limit deviation	hl4												Hl5
Diameter of circumscribed circle for type A	e, min	18.8	21.0	26.7	33.5	35.6	40.3	45.9	51.4	61.7	73.1	84.5	90.4	96.0	102.0	107.5	113.5	118.0	124.0	130.0	147.0	163.0	180.0	195.5	203.5	229.0	263.0
Height for type A	H, limit deviation h14	10	12	16	20	22	24	27	30	36	42	48	52	56	60	64	68	72	76	80	90	100	110	120	125	140	160
Maximum offset of hole axis relative to flats		-	0.4	0.5		0.6					0.7				0.8				0.87			1.00				1.15
Width across flats for type B	S	-	13	17	22	27		32		36	41	46	55		60		65	75			90	105	120			145	155
	Limit deviation	-	h12																		H14
Outer diameter of nut D₁ for type B		-	24	28	32	36	40	48		55	65	75	85		90	95	100	115			135	150	165	180	190	210	235
Diameter of circumscribed circle e for type B		-	16.2	19.6	25.4	31.2		36.9		41.6	47.3	53.1	63.5		69.3		75.1	86.5			98	121	133			167	179
Diameter of threaded hole pitch circle D₄ for type B (version 2)		-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	92	102	110	125	130
Diameter of groove df for type B		-	13	17	20	23	25	28	31	37	43	49	53	57	61	66	70	74	78	82	92	102	112	122	127	142	162
Diameter of hole in head d₂		-	-	-	8								12							15				75
for type B (version 2)		-	-	-	-	-	-	-	26		32		37		43			48			62	75		85		100	105

Continued, mm.

Nominal thread diameter d		10	12	16	20	(22)	24	27	30	36	42	48	(52)	56	(60)	64	(68)	72	(76)	80	90	100	110	(120)	125	140	160
Thread pitch	coarse	1.5	1.75	2.0	2.5		3.0		3.5	4.0	4.5	5.0		5.5		6.0		-	-	-	-	-	-	-	-	-	-
	fine	1.25		1.5			2.0			3.0				4.0				4.0 and 6.0
Diameter of threaded hole d₃ for type B (version 3)		-	-	-	-	-	-	-	-	-	M16					M36								M48
Depth of axial hole l for type B		-	21	26	32	36	40		43	49	56	64	70	76	81	88	90	96	100	104	116	126	136	146		168	192
Height of head l₀ for type B		-	10	12			16	18	20		25		30	35							45	50		60		70	80
Height of nut l₁ for type B		-	35	40	50	55	65	70	75	80	95	105	112	130	135	145	150	155	160	165	190	205	225	240		275	310
Length of thread in axial hole l₂ for type B (version 3)		-	-	-	-	-	-	-	-	-	34								58
Dimensions of groove f₁ for type B		-	As per GOST 10549-63
Height of axial hole groove n for type B		-	2								3			4
Chamfer c for type B		-	2						3				6

Notes:

1. Nuts with dimensions shown in brackets should be avoided where possible.

2. Unspecified dimensional tolerances: H14, h14, ± per GOST 25670-83.

3. Type B nuts may be manufactured without boring of the axial hole, with a chamfer.

4. The groove dimension f₁ may be increased up to 35 mm for nuts larger than M72, with a corresponding increase in nut height. When a short-type groove is made per GOST 10549-80, the overall nut height l₁ and the depth of the axial hole l may be reduced compared with the table, but by no more than 10 mm.

5. Type B nuts may have flats or grooves at the base for locking.

6. For type A nuts manufactured by forging, tolerances for the width across flats may be per h16.

Examples of designations:

Type A nut, thread diameter 12 mm, coarse thread pitch 1.75 mm, tolerance class 6H, made of carbon steel grade 35, category III, with coating 02, thickness 6 µm:

Nut AM12-6H.35.III.026 GOST 9064-75

Type B nut, version 2, thread diameter 48 mm, fine thread pitch 3 mm, tolerance class 6H, made of steel grade EP182 vacuum-arc remelted, category IV, quality group 3, uncoated:

Nut B2M48 × 3-6H.EP182-VD.IV.3 GOST 9064-75

Metric thread — per GOST 24705-81.

Nut mass is given in Informative Appendix 1.

Technical requirements — per GOST 20700-75.

APPENDIX 1 (informative)

Nominal thread diameter d, mm	Mass, kg, w, of nut types
	A	B
		Type 1	Type 2	Type 3
10	0.014	-	-	-
12	0.019	0.083	-	-
16	0.039	0.118	-	-
20	0.077	0.203	0.21	-
(22)	0.093	0.290	0.31	-
24	0.133	0.412	0.43	-
(27)	0.194	0.670	-	-
30	0.277	0.680	0.72	-
36	0.446	0.960	0.92	-
42	0.777	1.610	1.48	1.66
48	1.197	2.380	2.25	2.44
(52)	1.420	2.940	2.84	3.01
56	1.668	3.374	2.95	3.29
(60)	2.080	3.929	4.15	4.67
64	2.310	4.591	4.17	4.81
(68)	2.740	5.318	-	-
72	3.005	8.166	7.41	8.11
(76)	3.53	8.741	7.38	7.88
80	4.02	8.546	7.20	7.72
90	5.82	12.551	11.60	12.92
100	8.09	16.960	15.20	17.46
110	9.71	22.359	20.39	22.96
(120)	13.42	27.503	25.69	28.46
125	15.42	29.545	-	-
140	21.06	44.147	40.11	45.11
160	29.66	52.773	55.83	61.43

Note. For type B nuts, version 2, with diameter up to M36, mass values are given for d₂ = 8 mm.