GOST 11860-85 Cap Nuts of Product Grade A. Design and Dimensions

GOST 11860-85 applies to cap nuts of product grade A with a thread diameter from 3 to 24 mm. The requirements of the standard are mandatory.

CAP NUTS OF PRODUCT GRADE A	GOST 11860-85 Supersedes GOST 11860-73
Design and dimensions
Blind nuts , product grade A . Construction and dimensions

Effective date — 01.01.87. 2006 edition with Amendment No. 1, approved in July 1992 (IUS 9-92).

The design and dimensions of Type 1 nuts conform to the drawing and Table 1; Type 2 nuts — to the drawing and Table 2.

* Reference dimension.

m₁ — minimum height across flats.

Table 1

mm

Nominal thread diameter d		3	4	5	6	8	10	12	(14)	16	(18)	20	(22)	24
Thread pitch	coarse	0.5	0.7	0.8	1	1.25	1.5	1.75	2.5		2.5			3
	fine	-	-	-	-	1	1.25		1.5					2
Width across flats S		5.5	7	8	10	13	16	18	21	24	27	30	34	36
Circumscribed circle diameter e, min		6.0	7.7	8.8	11.1	14.4	17.8	20.0	23.4	26.7	30.1	33.5	37.7	40.0
H, tolerance per h14		7.5	8.0	10.0	12.0	15.0	18.0	22.0	25.0	28.0	32.0	34.0	39.0	42.0
m, tolerance per h14		2.4	3.2	4.0	5.0	6.5	8.0	10.0	11.0	13.0	15.0	16.0	18.0	19.0
D₁, tolerance per h14		5.0	6.5	7.5	9.5	12.5	15.0	17.0	20.0	23.0	26.0	28.0	33.0	34.0
da	max	3.45	4.60	5.75	6.75	8.75	10.80	13.00	15.10	17.30	19.40	21.60	23.80	25.90
	min	3	4	5	6	8	10	12	14	16	18	20	22	24
R ≈		2.5	3.2	3.7	4.7	6.2	7.5	8.5	10.0	11.5	13.0	14.0	16.5	17.0
l, tolerance per js15		5.0	5.5	7.5	8.0	11	13	16	18	21	25	26	29	31
l₁, min		2	3	3.8	4	6	7	9	11	13	14	16	18	19
dw, min		5.0	5.8	6.8	8.3	11.3	14.3	16.2	19.2	22.2	25.3	28.2	31.4	33.2
w, min		2.0						3.0	4.0		5.0			6.0

Table 2

mm

Nominal thread diameter d		4	5	6	8	10	12	(14)	16	(18)	20	(22)	24
Thread pitch	coarse	0.7	0.8	1	1.25	1.5	1.75	2		2.5			3
	fine	-	-	-	1	1.25		1.5					2
Width across flats S, tolerance per h13		7	8	10	13	16	18	21	24	27	30	34	36
Circumscribed circle diameter e, min		7.7	8.8	11.1	14.4	17.8	20.0	23.4	26.7	30.1	33.5	37.7	40.0
H₁, tolerance per h14		5.5	7	9	12	14	16	18	20	22	25	28	30
m₁, min		2.75	3.5	4.5	6	7	8	9	10	11	12.5	14	15
da	max	4.60	5.75	6.75	8.75	10.80	13.00	15.10	17.30	19.40	21.60	23.80	25.90
	min	4	5	6	8	10	12	14	16	18	20	22	24
R₁≈		8	10	12	15	20	25	28	30	32	35	35	40
l₂, max		4.4	5.2	7	9.5	11	13.5	15	17	19	21	22	24
l₃, min		3	3.8	4	6	7	9	11	13	14	16	18	19
dw, min		6.3	7.2	9.0	11.7	14.6	16.6	19.6	22.5	25.3	28.2	31.7	33.6
w, min		1		1.5	2						2.5	3

Notes to Tables 1 and 2:

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

2. For products designed before 01.01.93, nuts M10, M12, M14 and M22 of Types 1 and 2 with dimensions specified in Appendix 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 11860-85

Same for a Type 2 nut, fine pitch, tolerance class 6H, property class 6, with 6 µm zinc coating, chromated, width across flats S = 16 mm:

Nut 2M12×1.25 - 6H.6.016(s16) GOST 11860-85

Items 1 and 2 — as amended by Amendment No. 1.

3. Thread — per GOST 24705-2004.

4. Thread undercut — short, per GOST 10549-80.

A normal groove per GOST 10549-80 is permitted for nuts with d ≥ 10 mm over the length l–l₁.

5. Unspecified tolerances and methods for inspecting dimensions, form deviations and surface position — per GOST 1759.1-82.

6. Surface defects and inspection methods — per GOST 1759.3-83.

7. A flat area with a diameter not exceeding 0.3D is permitted on the radius surface.

8. The configuration of the hole bottom is not regulated.

9. Technical requirements — per GOST 1759.0-87 for product grade A nuts.

10. The theoretical mass of Type 1 nuts is given in the Appendix.

APPENDIX 1

For reference

Table 3

Nominal thread diameter d, mm	Theoretical mass of 1000 nuts, kg, Type
	1	2
3	0.92	-
4	1.60	1.30
5	2.43	2.16
6	4.93	4.40
8	10.00	9.67
10	17.46	16.91
12	26.06	22.04
14	40.40	34.74
16	57.80	48.78
18	83.68	67.48
20	102.13	94.87
22	167.00	137.10
24	192.60	174.40

Mass of steel nuts with coarse thread pitch.

To determine the mass of aluminium and brass nuts, multiply the mass values given in the table by the following coefficients:

0.356 — for aluminium alloy;

1.080 — for brass.

Appendix 1 — as amended by Amendment No. 1.

APPENDIX 2

For reference

Table 4

mm

Nominal thread diameter d	10	12	14	22
Width across flats	17	19	22	32
Circumscribed circle diameter e, min	18.9	21.1	24.5	35.7
lw, min	15.3	17.2	20.2	29.5
D, tolerance per h14	16	18	21	30
R≈	8.0	9.0	10.5	15.0

Example of designation for a Type 1 nut, thread diameter d = 10 mm, coarse pitch, tolerance class 6H, property class 6, plain (uncoated):

Nut M10 - 6H.6 GOST 11860-85.

Appendix 2 was added by Amendment No. 1.

Equivalent to DIN 1587.