GOST 3032-76 Fly Nuts. Design and Dimensions

INTERSTATE STANDARD

FLY NUTS Design and Dimensions Fly nuts. Construction and dimensions	GOST 3032-76 Supersedes GOST 3032-66

Effective date established by Resolution No. 1123 of the USSR State Committee for Standards of the Council of Ministers dated May 10, 1976

01.07.77

The validity period restriction was lifted by Resolution No. 389 of Gosstandart dated 13.04.92

2006 edition with Amendments No. 1, 2, approved in December 1981 and December 1986 (IUS 3-82, 2-87).

1. This standard applies to fly nuts of product grade B with a thread diameter from 3 to 24 mm.

(Revised edition, Amendment No. 2).

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

mm

Nominal thread diameter d		M3	M4	M5	M6	M8	M10	M 12	(M14)	M16	(M18)	M20	M24
Thread pitch P	coarse	0.5	0.7	0.8	1.0	1.25	1.5	1.75	2		2.5		3
	fine	-	-	-	-	1.0	1.25		1.5				2
D		7	8	10	12	15	18	22	26	30	32	34	45
D₁		6	7	8	10	13	15	19	22	26	28	30	38
L		20	24	28	32	40	48	55	60	70	75	85	100
H		8	10	12	14	18	22	26	30	32	34	38	48
hjs15		3	4	5	6	8	10	12	14		16		20
b		1.2	1.5	2.0	2.5	3.0	3.4	4.0	5.0	6.0		7.0	9.0
b₁		1.5	2.0	2.5	3.0	3.4	4.0	5.0	6.0	7.0		8.0	11
d₁H16		-	4.0	4.5	5.0	6.0	7.0	8.5	9.0	10.0	11.0	11.5	15.0
R≈		3.0	4.0	4.5	5.0	6.0	7.0	8.5	9.0	10.0	11.0	11.5	15.0
r, not more than		1.5	2.0	2.5	3.0	4.0	4.5	5.0	6.0	7.0	8.0	9.0	11.0
r₁, min		-			1.0						1.5		2.5

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

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

Nut M10 - 6H.6 GOST 3032-76

Same, version 2, with fine thread pitch, tolerance class 6H, made of L63 material, group 32, with nickel coating 6 µm thick:

Nut 2.M10×1.5 - 6H.32.036 GOST 3032-76

(Revised edition, Amendments No. 1, 2).

3. At the consumer’s request, fly nuts shall be manufactured with holes in the wings.

4. Thread - per GOST 9150-2002, GOST 24705-2004; tolerance class 6H - per GOST 16093-2004. At the consumer’s request, the thread shall be manufactured with tolerance class 5H6H or 6G.

(Revised edition, Amendments No. 1, 2).

5. Perpendicularity tolerance of the nut’s bearing surface relative to the thread axis - 0.0175×0.8D.

(Amended edition, Amendment No. 1).

6. Limit deviations of dimensions obtained by stamping - per accuracy class II of GOST 7505-89; by casting - per accuracy class II of GOST 26645-85.

7. Coaxiality tolerance of the threaded hole axis relative to the cone axis, expressed as a diameter - 2 IT 15.

8. Fly nuts may be manufactured from steel grades 25L, 35L, 40L, 45L per GOST 977-88 and cast iron per GOST 1215-79 or GOST 7293-85.

Fly nuts made of the above materials are not subject to proof load testing.

7, 8. (Amended edition, Amendment No. 1).

9. Other technical requirements - per GOST 1759.0-87 for nuts of product grade B.

(Revised edition, Amendments No. 1, 2).

9a. Dimensional defects, form and position deviations - per GOST 1759.1-82.

9b. Surface defects and inspection methods - per GOST 1759.3-83.

9a, 9b. (Additionally introduced, Amendment No. 2).

10. The theoretical mass of nuts is given in the appendix.

Appendix

For reference

Theoretical mass of steel nuts with coarse thread pitch

Nominal thread diameter d, mm	Weight of 1000 pcs, kg ≈
3	1.521
4	2.735
5	4.563
6	7.817
8	14.90
10	24.76
12	43.41
14	66.19
16	94.42
18	113.7
20	141.8
24	310.6

To determine the mass of nuts made of other materials, multiply the masses given in the table by the following coefficients:

0.356 - for aluminium alloy;

1.08 - for brass;

0.92 - for malleable cast iron.

Corresponds to DIN 314.