GOST 11074-93 Set Screws with Flat Point and Hexagon Socket, Product Grades A and B. Specifications

GOST 11074-93 applies to set screws with flat point and hexagon socket, product grades A and B, with nominal diameter d from 1.6 to 24 mm.

The requirements of the standard are mandatory. Additional requirements meeting the needs of the national economy are shown in italics.

The standard was developed by the direct application method of the international standard ISO 4026-77 “Hexagon socket set screws with flat point” with additional requirements. It replaces GOST 11074-84.

Name of state	Name of national standardization body
Republic of Belarus Kyrgyz Republic Republic of Moldova Russian Federation Republic of Tajikistan Turkmenistan Ukraine	Belstandart Kyrgyzstandart Moldovastandart Gosstandart of Russia Tajikstandart Turkmenglavgosinspektsiya Gosstandart of Ukraine

INTERSTATE STANDARD
SET SCREWS WITH FLAT POINT AND HEXAGON SOCKET, PRODUCT GRADES A AND B. Specifications. Hexagon socket flat-point set screws. Product grades A and B. Specifications	GOST 11074-93 (ISO 4026-77)

1. Dimensions

Screw dimensions shall comply with those shown in the figure and in Table 1.

A 120° chamfer angle is mandatory for short screws, whose lengths are given above the dashed stepped line in Table 1. The 45° angle applies only to the part of the point below the minor diameter of the thread. A slight rounding or countersinking is permitted.

Table 1

Nominal thread diameter d					1.6	2	2.5	3	4	5	6	8	10	12	16	20	24
Thread pitch P					0.35	0.4	0.45	0.5	0.7	0.8	1.0	1.25	1.5	1.75	2.0	2.5	3.0
dz		max.			0.8	1.0	1.5	2.0	2.5	3.5	4.0	5.5	7.0	8.5	12.0	15.0	18.0
		min.			0.55	0.75	1.25	1.75	2.25	3.2	3.7	5.2	6.64	8.14	11.57	14.57	17.57
df					Internal thread diameter
e		min.1)			0.803	1.003	1.427	1.73	2.30	2.87	3.44	4.58	5.72	6.86	9.15	11.43	13.72
S		nom.			0.7	0.9	1.3	1.5	2.0	2.5	3.0	4.0	5.0	6.0	8.0	10.0	12.0
		min.			0.711	0.889	1.270	1.520	2.020	2.520	3.020	4.020	5.020	6.020	8.025	10.026	12.032
		max.			0.724	0.902	1.295	1.545	2.045	2.560	3.080	4.095	5.095	6.095	8.115	10.115	12.142
t min		2)			0.7	0.8	1.2	1.2	1.5	2.0	2.0	3.0	4.0	4.8	6.4	8.0	10.0
		3)			1.5	1.7	2.0	2.0	2.5	3.0	3.5	5.0	6.0	8.0	10.0	12.0	15.0
l	Product grade
	A		B
nom- min.	min.	max.	min.	max.
2	1.8	2.2	1.5	2.5
2.5	2.3	2.7	2.0	3.0
3	2.8	3.2	2.5	3.5
4	3.7	4.3	3.4	4.6
5	4.7	5.3	4.4	5.6
6	5.7	6.3	5.4	6.6
8	7.7	8.3	7.3	8.7
10	9.7	10.3	9.3	10.7
12	11.6	12.3	11.1	12.9					Standard lengths
16	15.6	16.3	15.1	16.9
20	19.5	20.4	18.9	21.0
25	24.5	25.4	23.9	26.0
30	29.5	30.4	28.9	31.0
35	34.5	35.5	33.7	36.2
40	39.5	40.5	38.7	41.2
45	44.5	45.5	43.7	46.2
50	49.5	50.5	48.7	51.2
55	54.4	55.6	53.5	56.2
60	59.4	60.6	58.5	61.5
70	69.4	70.6	68.5	71.5
80	79.4	80.6	78.5	81.5
90	89.3	90.7	88.2	91.7
100	99.3	100.7	98.2	101.7
1} e min ≈ 1.14 min, except for sizes M1.6, M2 and M2.5. 2) Minimum wrench engagement depth for screws with nominal lengths given above the dashed line. 3) Minimum wrench engagement depth for screws with nominal lengths given below the dashed line.

The theoretical mass of screws is given in the appendix.

2. Technical requirements

Screws shall be manufactured in accordance with the requirements given in Table 2.

Table 2

Material		Steel	Corrosion-resistant steel	Non-ferrous alloys
Thread	Tolerance class	5 g6 g for grade 45H; 6 g for other grades
	Standard	GOST 16093, GOST 24705
Mechanical properties	Property class or material group	14H, 22H 33H, 45H	21-26	31-35
	Standards	GOST 25556	GOST 1759.0
Tolerances	Product grade	A, B
	Standards	GOST 1759.1
Product surface		Smooth. Requirements for electroplated coatings per GOST 9.301, GOST 9.303. Screws shall be manufactured with coatings: zinc chromated, nickel, oxide oil-impregnated, phosphate oil-impregnated, or without coating. Other types of coatings may be used by agreement between the manufacturer and the customer.
Acceptance		Acceptance rules - GOST 17769
Test methods		Dimensions, form and position tolerances of surfaces - per GOST 1759.1
		Surface defects - GOST 1759.2
		Mechanical properties
		GOST 25556	GOST 1759.0	GOST 1759.0
Marking and packaging		GOST 1759.0, GOST 18160

3. Designation

Examples of designation.

Set screw with flat point and hexagon socket, product grade B, thread diameter d = 10 mm, tolerance class 6g, length l = 25 mm, property class 14H, without coating:

Screw M10-6g×25.14H GOST 11074-93

Same, product grade A, property class 45H, made of steel 40Kh with chemical oxide coating, oil-impregnated:

Screw A.M10-6g×25.45H.40Kh.05 GOST 11074-93

Same, made of brass LS59-1, without coating:

Screw A.M10-6g×25.32LS59-1 GOST 11074-93

Appendix (informative). Mass of screws

Table 3

Length l, mm	Theoretical mass of 1000 pcs of steel screws, kg ≈, at nominal thread diameter d, mm
	1.6	2	2.5	3	4	5	6	8	10	12	16	20	24
2	0.026	0.032	0.033	0.039
2.5	0.028	0.042	0.045	0.054	0.065
3	0.036	0.043	0.058	0.069	0.085
4	0.052	0.063	0.072	0.085	0.126
5	0.068	0.083	0.097	0.115	0.143
6	0.084	0.103	0.122	0.145	0.400
8	0.108	0.143	0.172	0.205	0.550	0.87	1.21
10		0.183	0.222	0.265	0.710	1.11	1.56
12			0.272	0.325	0.860	1.36	1.91	3.30
16				0.445	1.170	1.86	2.61	4.57	7.05	9, 62
20					1.480	2.35	3.33	5.85	9.06	12.54	22.2?
25						2.97	4.20	7.44	11.58	16.25	28.95	44.34
30							5.08	9.03	14.08	19.87	35.09	54.69	75.72
35								10.63	16.60	23.48	42.25	65.10	90.09
40								12.22	19.12	27.10	48.95	75.52	105.16
45								13.81	21.64	30.80	55.60	85.97	120.13
50								15.41	24.15	34.42	62.31	96.38	135.11
55									26.57	38.03	68.94	106.82	, 150.08
60									29.08	41.73	75.60	117.25	165.05
70									34.11	48.96	88.96	138.08	195.09
80										56.29	102.29	158.88	225.03
90											115.59	179.71	255.07
100												200.57	286.08
Note. To determine the mass of screws made of other materials, the mass values given in the table shall be multiplied by the coefficient: 0.356 for aluminium alloy; 0.97 for bronze; 1.08 for brass.

Referenced regulatory and technical documents

Designation of the referenced regulatory document	Section number
GOST 9.301-86	2
GOST 9.303-84	2
GOST 1759.0-87	2
GOST 1759.1-82	2
GOST 1759.2-82	2
GOST 16093-2004	2
GOST 17769-83	2
GOST 18160-72	2
GOST 24705-2004	2
GOST 25556-82	2

Corresponds to DIN 913, ISO 4026.