GOST 5918-73 Hexagon Slotted and Castle Nuts of Product Grade B. Design and Dimensions

GOST 5918-73 applies to hexagon slotted and castle nuts of product grade B with thread diameter from 4 to 48 mm.

The standard fully complies with ST SEV 2664-89.

HEXAGON SLOTTED AND CASTLE NUTS OF PRODUCT GRADE B	GOST 5918-73
Design and dimensions
Hexagon slotted and castle nuts, accuracy class B. Construction and dimensions

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

Table 1

mm

Nominal thread diameter d		4	5	6	8	10	12	(14)	16	(18)	20	(22)	24	(27)	30	(33)	36	(39)	42	48
Thread pitch	coarse	0.7	0.8	1.0	1.25	1.5	1.75	2.0	2.0	2.5	2.5	2.5	3.0	3.0	3.5	3.5	4.0	4.0	4.5	4.5
	fine	-	-	-	1.0	1.25	1.25	1.5	1.5	1.5	1.5	1.5	2.0	2.0	2.0	2.0	3.0	3.0	3.0	3.0
Width across flats S		7	8	10	13	16	18	21	24	27	30	34	36	41	46	50	55	60	65	75
Height h		5.0	6.7	7.7	9.8	12.4	15.8	17.8	20.8	22.4	24.0	27.8	29.5	31.6	34.6	37.7	40.0	42.4	46	50
Distance from the bearing surface to the bottom of the slot f and of the castle m		3.2	4.7	5.2	6.8	8.4	10.8	12.8	14.8	16.4	18.0	19.8	21.5	23.6	25.6	28.7	31.0	33.4	34.0	38.0
dw, min		6.3	7.2	9.0	11.7	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	59.9	69.4
Circumscribed circle diameter e, min		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	55.4	60.8	66.5	71.3	82.6
Chamfer diameter da	min	4	5	6	8	10	12	14	16	18	20	22	24	27	30	33	36	39	42	48
	max	4.6	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	35.6	38.9	42.2	45.4	51.8
Crown diameter D		-	-	-	-	-	16	19	22	25	28	32	34	38	42	46	50	55	58	65
Number of slots		6																	8
Slot width n		1.2	1.4	2.0	2.5	2.8	3.5	3.5	4.5	4.5	4.5	5.5	5.5	5.5	7.0	7.0	7.0	7.0	9.0	9.0
Cotter pin size (recommended) per GOST 397	Type 1	1×12	1.2×12	1.6×16	2×20	2×25	3.2×32		4×36	4×40		5×45		5×50	6.3×63	6.3×63	6.3×71	6.3×71	8×80	8×90
	Type 2	-	-	-	-	-	3.2×25		4×32	4×36		5×40		5×45	6.3×50	6.3×50	6.3×63	6.3×63	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 Type 1 nut, thread diameter d = 12 mm, coarse pitch, tolerance class 6H, property class 5, plain (uncoated):

Nut M12 - 6H.5 GOST 5918-73

Same, version 2, with fine thread pitch, tolerance class 6H, coating 01, thickness 9 µm:

Nut 2M12×1.25 - 6H.5.019 GOST 5918-73

Thread — per GOST 24705.

A chamfer on the slot or crown side is permitted.

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

Technical requirements — per GOST 1759.0.

Theoretical mass of nuts is given in Annex 1.

APPENDIX 1

For reference

Mass of steel nuts with coarse thread pitch

Table 2

Nominal thread diameter d, mm	Theoretical mass of 1000 nuts, kg
	Type 1	Type 2
4	1.099	-
5	1.767	-
6	3.295	-
8	7.027	-
10	14.030	-
12	20.881	18.326
14	32.176	28.079
16	46.404	42.099
18	62.596	59.875
20	86.221	79.795
22	124.019	114.744
24	152.156	140.738
27	216.998	199.130
30	301.228	275.592
33	409.503	377.149
36	505.760	466.689
39	670.44	614.836
42	800.488	728.350
48	1192.376	1079.830

APPENDIX 2

For reference

Table 3

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

INFORMATIONAL DATA

The standard complies with international standards ISO 4032-79, ISO 4035-79 in terms of width across flats dimensions.

Supersedes GOST 5918-62.

Referenced normative-technical documents:

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

The validity period restriction was lifted by Protocol No. 4-93 of the Interstate Council for Standardization, Metrology and Certification.

Edition incorporating Amendments No. 1, 2, 3, 4, 5, approved in September 1979, December 1981, October 1984, March 1989, March 1990.

Complies with DIN 935, EN ISO 7035.

d		M4	M5	M6	M8	M10	M12	M14*	M16	M18*	M20	M22*	M24	M27*	M30	M33*	M36	M39*	M42	M48
P	coarse	0.7	0.8	1	1.25	1.5	1.75	2.0	2.0	2.5	2.5	2.5	3.0	3.0	3.5	3.5	4.0	4.0	4.5	4.5
	fine	-	-	-	1	1.25	1.25	1.5	1.5	1.5	1.5	1.5	2.0	2.0	2.0	2.0	3.0	3.0	3.0	3.0
da	min	4	5	6	8	10	12	14	16	18	20	22	24	27	30	33	36	39	42	48
	max	4.6	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	35.6	38.9	42.2	45.4	51.8
m, f		3.2	4.7	5.2	6.8	8.4	10.8	12.8	14.8	16.4	18	19.8	21.5	23.6	25.6	28.7	31.0	33.4	34.0	38.0
h		5.0	6.7	7.7	9.8	12.4	15.8	17.8	20.8	22.4	24.0	27.8	29.5	31.6	34.6	37.7	40.0	42.4	46	50
D		-	-	-	-	-	16	19	22	25	28	32	34	38	42	46	50	55	58	65
k		6																	8
n		1.2	1.4	2.0	2.5	2.8	3.5	3.5	4.5	4.5	4.5	5.5	5.5	5.5	7.0	7.0	7.0	7.0	9.0	9.0
e		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	55.4	60.8	66.5	71.3	82.6
dw		6.3	7.2	9.0	11.7	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	59.9	69.4
S		7	8	10	13	16	18	21	24	27	30	34	36	41	46	50	55	60	65	75
N	Version 1	1.099	1.767	3.295	7.027	14.03	20.88	32.18	46.40	62.60	86.22	124.0	152.2	217.0	301.2	409.5	505.8	670.4	800.5	1192
	Version 2	-	-	-	-	-	18.33	28.08	42.10	59.88	79.80	114.7	140.7	199.1	275.6	377.1	466.7	614.8	728.4	1080
T	Version 1	1×12	1.2×12	1.6×16	2×20	2×25	3.2×32		4×36	4×40		5×45		5×50	6.3×63	6.3×63	6.3×71	6.3×71	8×80	8×90
	Version 2	-	-	-	-	-	3.2×25		4×32	4×36		5×40		5×45	6.3×50	6.3×50	6.3×63	6.3×63	8×71	8×80