GOST 2528-73 Hexagon Slotted Nuts with Reduced Width Across Flats, Product Grade A. Design and Dimensions

INTERSTATE STANDARD

HEXAGON SLOTTED NUTS WITH REDUCED WIDTH ACROSS FLATS, PRODUCT GRADE A	GOST 2528-73
Design and dimensions
Hexagon slotted nuts with reduced width across flats, accuracy class A. Construction and dimensions

Effective date 01.01.74

This standard applies to slotted hexagon nuts with reduced width across flats, product grade A, with thread diameters from 8 to 48 mm.

(Revised edition, Amendment No. 2).

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

Table 1

Dimensions, mm

Nominal thread diameter d		8	10	12	(14)	16	(18)	20	(22)	24	(27)	30	(33)	36	(39)	42	48
Thread pitch	coarse	1.25	1.5	1.75	2	2	2.5	2.5	2.5	3	3	3.5	3.5	4	4	4.5	5
	fine	1	1.25	1.25	1.5	1.5	1.5	1.5	1.5	2	2	2	2	3	3	3
Width across flats S		12	14	16	18	21	24	27	30	34	36	41	46	50	55	60	70
Height h		9.5	12	15	16	19	21	22	26	27	30	33	35	38	40	46	50
Diameter of circumscribed circle e, min		13.3	15.5	17.8	20.0	23.4	26.8	30.1	33.5	37.7	40.0	45.6	51.3	55.8	61.3	67.0	78.3
dw, min		10.6	12.6	14.6	16.6	19.6	22.5	25.3	27.7	31.7	33.2	38.3	42.7	46.6	51.1	55.9	65.8
Number of slots		6														8
Slot width n		2.5	2.8	3.5		4.5			5.5			7				9
Distance from bearing surface to slot base f		6.5	8	10	11	13	15	16	18	19	22	24	26	29	31	34	38
Chamfer diameter da	min	8	10	12	14	16	18	20	22	24	27	30	33	36	39	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	35.6	38.9	42.2	45.4	51.8
Cotter pin size (recommended) per GOST 397		2×20	2.5×25	3.2×25		4×32	4×36		5×40		5×45	6.3×50	6.3×56	6.3×63	6.3×71	8×71	8×80

Notes:

1. Dimensions in parentheses are not recommended for use.

2. For products designed before 01.01.91, nuts with dimensions specified in Annex 2 may be used.

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

Nut M12 - 6H.5 GOST 2528-73

Same, with fine thread pitch, tolerance class 6H, with coating 01, thickness 9 µm:

Nut M12×1.25 - 6H.5.019 GOST 2528-73

(Amended edition, Amendments No. 1, 2, 3, 4).

2. Thread — per GOST 24705.

(Amended edition, Amendment No. 3).

3. A chamfer on the slot side is permitted.

3a. The shape of the slot bottom may be flat, rounded, or chamfered.

(Added, Amendment No. 2).

4. Technical requirements - per GOST 1759.0; nut property classes: 4, 5, 6.

(Amended, Amendment No. 4).

5. Theoretical mass of nuts is given in Annex 1.

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 ≈
8	5.42
10	8.64
12	13.82
14	18.04
16	28.72
18	42.66
20	57.77
22	82.59
24	113.56
27	136.94
30	201.04
33	280.49
36	359.94
39	490.93
42	621.91
48	962.82

To determine the mass of nuts made of other materials, the mass values given in the table should be multiplied by the following factors:

0.356 - for aluminium alloy;

1.080 - for brass.

ANNEX 1. (Amended edition, Amendments No. 2, 4).

APPENDIX 2

For reference

mm

Nominal thread diameter d	12	14	16	24
Width across flats S	17	19	22	32
Circumscribed circle diameter e, min	18.9	21.1	24.5	35.8
dw, min	15.6	17.4	20.6	30.0

ANNEX 2. (Introduced additionally, Amendment No. 4).

INFORMATIONAL DATA

1. DEVELOPED AND SUBMITTED BY the USSR State Committee for Standards

2. APPROVED AND PUT INTO EFFECT by Decree of the USSR State Committee for Standards of the Council of Ministers dated 23.01.73 No. 141

3. REPLACES GOST 2528-62

4. REFERENCE REGULATORY AND TECHNICAL DOCUMENTS

Designation of the referenced regulatory document	Clause number
GOST 397-79	1
GOST 1759.0-87	4
GOST 24705-2004	2

5. The validity restriction was lifted by Protocol No. 4-93 of the Interstate Council for Standardization, Metrology and Certification (IUS 4-94)

6. EDITION 2006 with Amendments No. 1, 2, 3, 4, approved in September 1979, December 1981, October 1984, March 1989 (IUS 10-79, 2-82, 1-85, 6-89).