GOST 15526-70 Hexagon Nuts, Product Grade C

GOST 15526-70 applies to hexagon nuts, product grade C, with thread diameter from 3 to 48 mm.

The standard fully complies with ST SEV 3684-82.

Hexagon Nuts, Product Grade C. Construction and Dimensions Hexagon nuts, product grade C. Construction and dimensions	GOST 15526-70 (ST SEV 3684-82)

The construction and dimensions of the nuts conform to those shown in the drawing and table.

Thread — per GOST 24705.

Tolerances of dimensions, form and position deviations of surfaces, and inspection methods not established by this standard — per GOST 1759.1.

mm

Nominal thread diameter d		3	4	5	6	8	10		12	(14)	16	(18)	20		(22)	24	(27)	30	36	42	48
Thread pitch		0.50	0.70	0.80	1.00	1.25	1.50		1.75	2		2.5				3		3.5	4	4.5	5
Width across flats S		5.5	7	8	10	13	16		18	21	24	27	30		34	36	41	46	55	65	75
Circumscribed circle diameter e, min		5.9	7.5	8.6	10.9	14.2	17.6		19.9	22.8	26.2	29.6	33.0		37.3	39.6	45.2	50.9	60.8	71.3	82.6
da	min	3	4	5	6	8		10	12	14	16	18	20	22		24	27	30	36	42	48
	max	3.45	4.60	5.75	6.75	8.75		10.8	13.0	15.1	17.3	19.4	21.6	23.8		25.9	29.2	32.4	38.9	45.4	51.8
dw, min		5.0	6.3	7.2	9.0	11.7	14.5		16.5	19.2	22.0	24.8	27.7		31.4	33.2	38.0	42.7	51.1	59.9	69.4
Height m		3.4	4.4	5.6	6.1	7.9	9.5		12.2	13.9	15.9	17.3	18.7		20.5	22.3	24.35	26.4	31.5	34.9	38.9

Notes:

1. Nut dimensions shown in brackets are not recommended for use.

2. Nuts may be manufactured with the dimensions specified in Appendix 2.

3. Nuts may be manufactured with a nominal height of not less than 0.8d and limit deviations per GOST 1759.1, provided the requirements of GOST 1759.5 are met.

Example of designation for a design 1 nut with thread diameter d = 12 mm, width across flats S = 18 mm, property class 5:

Nut M12.5 (S18) GOST 15526-70

Same, design 2, with width across flats S = 19 mm, property class 4:

Nut 2M12.4 GOST 15526-70

Permissible surface defects of nuts and inspection methods — per GOST 1759.3.

Technical requirements — per GOST 1759.0.

The mechanical properties of nuts correspond to property classes 4 and 5 per GOST 1759.5.

Nuts are supplied plain (uncoated).

In design 3 nuts, metal draw-down causing a local reduction in edge height of not more than 3 mm is permitted.

The mass of nuts is given in Appendix 1.

APPENDIX 1

For reference

Weight of steel nuts (design 1)

Nominal thread diameter d, mm	Theoretical mass of 1000 pcs of nuts, kg ≈	Nominal thread diameter d, mm	Theoretical mass of 1000 pcs of nuts, kg ≈	Nominal thread diameter d, mm	Theoretical mass of 1000 pcs of nuts, kg ≈
3	0.542	12	17.730	24	127.50
4	1.109	14	27.43	27	180.90
5	1.720	16	40.450	30	250.30
6	3.026	18	56.250	36	423.60
8	6.461	20	74.26	42	661.50
10	11.580	22	106.90	48	988.20

APPENDIX 2

For reference

Dimensions in mm

Nominal thread diameter, d	10	12	14	22
Width across flats S	17	19	22	32
Circumscribed circle diameter e, min	18.7	20.9	23.9	35.0
dw, min	15.5	17.2	20.1	29.5
Theoretical weight of 1000 nuts (design 1) with coarse thread pitch, kg ≈	13.67	20.76	31.43	88.75

INFORMATIONAL DATA

The standard was developed by the Ministry of Ferrous Metallurgy of the USSR and approved by Resolution No. 178 of the Committee for Standards, Weights and Measuring Instruments under the Council of Ministers of the USSR dated 12.08.70.

The standard fully complies with ST SEV 3684-82.

Referenced normative-technical documents:

Designation of the referenced regulatory document	Clause number	Designation of the referenced regulatory document	Clause number
GOST 1759.0-87	4	GOST 1759.5-87	2, 4
GOST 1759.1-82	2, 3a	GOST 24705-81	3
GOST 1759.3-83	3b

The validity restriction was lifted by Protocol No. 5-94 of the Interstate Council for Standardization, Metrology and Certification (IUS 11-12-94).