GOST 15525-70 Hexagon Thick Nuts, Product Grade B

GOST 15525-70 applies to hexagon thick nuts, product grade B, with thread diameter from 8 to 48 mm.

Hexagon Thick Nuts, Product Grade B. Construction and Dimensions	GOST 15525-70

Effective date 01.01.72; for the width across flats S = 13 mm, effective date 01.01.73.

The design and dimensions of the nuts shall comply with those shown in the drawing and table.

Thread — per GOST 24705.

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

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

Technical requirements — per GOST 1759.0.

The mass of nuts is given in Appendix 1.

Nominal thread diameter d		8	10	12	(14)	16	(18)	20	(22)	24	(27)	30	36	42	48
Thread pitch	coarse	1.25	1.5	1.75	2	2.5			3		3.5	4	4.5	5
	fine	1	1.25		1.5					2			3
Width across flats s		13	16	18	21	24	27	30	34	36	41	46	55	65	75
Circumscribed circle diameter e, min		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	8.0	10	12	14	16	18	20	22	24	27	30	36	42	48
	max	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		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		12	15	18	21	24	27	30	32	36	40	45	54	63	71

Notes.

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

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

Example of a designation for a type 1 nut with thread diameter d = 12 mm, width across flats S = 18 mm, coarse thread pitch, tolerance class 6H, property class 5, plain (no coating):

Nut M12-6H.5 (S18) GOST 15525-70

Same, type 2, with width across flats S = 19 mm, fine thread pitch, tolerance class 6H, property class 12, made from steel grade 40Kh, with coating 01, thickness 6 μm:

Nut 2M12×1.25-6H.12.40Kh.016 GOST 15525-70

Appendix 1 (informative). Mass of steel nuts (Version 1) with coarse thread pitch

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 ≈
8	9.650	18	86.230	30	420.6
10	12.980	20	117.100	36	715.3
12	25.600	22	169.0	42	1179.0
14	43.590	24	202.3	48	1780.7
16	59.900	27	292.5

To determine the weight of nuts made from other materials, the weight values given in the table should be multiplied by the following factors: 0.356 for aluminium alloy; 1.080 for brass.

Appendix 2 (informative). 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 ≈	16.31	30.08	49.67	140.6

Information data

The standard was approved and put into effect by Resolution No. 178 of the Committee for Standards, Weights and Measuring Instruments under the USSR Council of Ministers dated 12.08.70. Introduced for the first time.

Referenced normative-technical documents:

Designation of the referenced regulatory document	Clause number	Designation of the referenced regulatory document	Clause number
GOST 1759.0-87	5	GOST 1759.3-83	3b
GOST 1759.1-82	3a	GOST 24705-81	3

The validity period restriction was lifted under Protocol No. 5-94 of the Interstate Council for Standardization, Metrology and Certification.

Reissued (September 1998) with Amendments No. 2–7, approved in 1974–1995.