GOST 2526-70 Hexagon Lock-Nuts with Reduced Width Across Flats, Product Grade A

GOST 2526-70 applies to hexagon lock-nuts with reduced width across flats, product grade A, with thread diameters from 8 to 48 mm.

Hexagon lock-nuts with reduced width across flats, product grade AConstruction and dimensions Hexagon lock-nuts with reduced width across flats, product grade A. Construction and dimensions	GOST 2526-70

Effective date — 01.01.1972.

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

Thread — per GOST 24705.

Dimensional tolerances, form and location deviations not established by this standard, and inspection methods, are as 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.

mm

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		12	14	17	19	22	24	27	30	32	36	41	50	60	70
Circumscribed circle diameter e, min		13.3	15.5	18.9	21.1	24.5	26.8	30.1	33.5	35.7	40.0	45.6	55.8	67.0	78.3
da	min	8	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		10.6	12.6	15.6	17.4	20.6	22.5	25.3	28.2	30.0	33.6	38.4	46.9	56.3	65.8
Height m		4	5	6	7	8	9	10	11	12	13.5	15	18	21	24

Note. Nut dimensions shown in parentheses are not recommended for use.

Example of a nut designation with thread diameter d = 12 mm, coarse pitch, tolerance class 6H, property class 04, without coating:

Nut M12-6H.04 GOST 2526-70

Same, with coarse pitch, tolerance class 6H, property class 04, made from steel grade A12, without coating:

Nut M12-6H.04A GOST 2526-70

Same, with fine pitch, tolerance class 6H, property class 05, made from steel grade 40Kh, with coating 01, 6 μm thick:

Nut M12 × 1.25-6H.05.40Kh.016 GOST 2526-70

APPENDIX 1 (informative)

Mass of steel nuts 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	2.348	18	18.716	30	93.862
10	3.713	20	26.460	36	171.531
12	6.730	22	35.971	42	296.729
14	9.271	24	44.410	48	473.815
16	14.285	27	61.557

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.

INFORMATIONAL DATA

Approved and put into effect by Resolution No. 178 of the Committee for Standards, Weights and Measuring Instruments under the Council of Ministers of the USSR dated 18.02.1970. Supersedes GOST 2526-62.

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

Reissued (September 1998) with Amendments No. 2–7, approved in February 1974, March 1981, June 1983, May 1985, March 1989, July 1995 (IUS 3-74, 6-81, 11-83, 8-85, 6-89, 9-95).