GOST 5931-70 Hexagon Thick Nuts, Product Grade A. Construction and Dimensions

State Standard of the Union of Soviet Socialist Republics

Hexagon Thick Nuts, Product Grade A. Construction and Dimensions	GOST 5931-70

Effective date 01.01.72

regarding the width across flats S = 13 mm, effective 01.01.73

1. This standard applies to hexagon thick nuts of product grade A with thread diameter from 8 to 48 mm.

(Amended, Amendment No. 4).

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

(Amended edition, Amendment No. 2-7).

3. Thread — per GOST 24705.

(Amended edition, Amendment No. 2, 4).

3a. Dimensional tolerances, form and position deviations, and inspection methods not established by this standard shall comply with GOST 1759.1.

3b. Permissible surface defects of nuts and inspection methods — per GOST 1759.3.

3a, 3b. (Added, Amendment No. 5).

4. By agreement between the manufacturer and the customer, nuts with nominal thread diameter from 36 to 48 mm may be manufactured with a thread pitch of 2 mm.

(Amended edition, Amendment No. 2, 5).

5. Technical requirements — per GOST 1759.0.

6. (Deleted, Amendment No. 2).

7. The mass of nuts is given in Appendix 1.

8. (Deleted, Amendment No. 4).

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		13	16	18	21	24	27	30	34	36	41	46	55	65	75
Circumscribed circle diameter e, min		14.4	17.8	20.0	23.4	26.8	30.1	33.5	37.7	40.0	45.6	51.3	61.3	72.6	83.9
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		11.7	14.6	16.6	19.6	22.5	25.3	28.2	31.7	33.6	38.4	43.1	51.5	61.0	70.5
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 designation for a 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 M12-6H5 (S18) GOST 5931-70

Same, with coarse thread pitch, tolerance class 6H, property class 6, made from steel grade A12, plain (no coating):

Nut M12-6H.6.A (S18) GOST 5931-70

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

Nut M12×1.25-6H.12.40Kh.016 GOST 5931-70

APPENDIX 1

For reference

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	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 mass of nuts made of other materials, the mass values given in the table should be multiplied by the following coefficients: 0.356 for aluminium alloy; 1.080 for brass.

APPENDIX 1. (Amended edition, Amendment No. 6).

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	18.9	21.1	24.5	35.7
dw, min	15.6	17.4	20.6	30.0
Theoretical weight of 1000 pcs of nuts with coarse thread pitch, kg »	16.31	30.08	49.67	140.6

APPENDIX 2. (Added, Amendment No. 6; amended edition, Amendment No. 7).

INFORMATIONAL DATA

1. DEVELOPED AND SUBMITTED BY the Ministry of Ferrous Metallurgy of the USSR

DEVELOPERS

I. N. Nedoviziy, Cand. Sci. (Eng.); B. M. Rigmant; V. I. Mokrinskiy, Cand. Sci. (Eng.)

2. APPROVED AND PUT INTO EFFECT by Decree of the Committee for Standards, Measures and Measuring Instruments under the USSR Council of Ministers dated 18.02.70 No. 178

3. SUPERSEDES GOST 5931-62

4. REFERENCE REGULATORY AND 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

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

6. REISSUE (September 1998) with Amendments No. 2, 3, 4, 5, 6, 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).

Corresponds to DIN 6330.