GOST 1477-93 Flat-Point Straight Slotted Set Screws. Product Grades A and B. Specifications

GOST 1477-93 applies to flat-point straight slotted set screws, product grades A and B, with nominal diameter d from 1.0 to 12 mm.

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

1. Dimensions

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

The 120° angle is mandatory for short screws, the length of which is given above the dashed stepped line in Table 1.

The 45° angle applies only to the part of the end below the minor diameter of the thread.

Table 1

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
FLAT-POINT STRAIGHT SLOTTED SET SCREWS, PRODUCT GRADES A AND B. SPECIFICATIONS Flat-point straight slotted set screws. Product grades A and B. Specifications	GOST 1477-93 (ISO 4766-84)

Nominal thread diameter d						1	1.2	1.6	2	2.5	3	(3.5)¹	4	5	6	8	10	12
Thread pitch P						0.25	0.25	0.35	0.4	0.45	0.5	0.6	0.7	0.8	1	1.25	1.5	1.75
df≈						Internal thread diameter
dp			min			0.35	0.35	0.55	0.75	1.25	1.75	1.95	2.25	3.2	3.7	5.2	6.64	8.14
			max			0.6	0.6	0.8	1	1.5	2	2.2	2.5	3.5	4	5.5	7	8.5
n			nom.			0.2	0.2	0.25	0.25	0.4	0.4	0.5	0.6	0.8	1	1.2	1.6	2
			min			0.26	0.26	0.31	0.31	0.46	0.46	0.56	0.66	0.86	1.06	1.26	1.66	2.06
			max			0.4	0.4	0.45	0.45	0.6	0.6	0.7	0.8	1	1.2	1.51	1.91	2.31
t			min			0.4	0.4	0.56	0.64	0.72	0.8	0.96	1.12	1.28	1.6	2	2.4	2.8
			max			0.52	0.52	0.74	0.84	0.95	1.05	1.21	1.42	1.63	2	2.5	3	3.6
l1)	Product grade
	A			B
but not less than	not less than	not more than		not less than	not more than
2	1.8	2.2		1.5	2.5
2.5	2.3	2.7		2	3
3	2.8	3.2		2.5	3.5
4	3.76	4.24		3.4	4.6
5	4.76	5.24		4.4	5.6
6	5.76	6.24		5.4	6.6
8	7.71	8.29		7.25	8.75
10	9.71	10.29		9.25	10.75
12	11.65	12.35		11.1	12.9						Standard lengths
(14)	13.65	14.35		13.1	14.9
16	15.58	16.42		15.1	16.9
(18)	17.58	18.42		17.1	18.9
20	19.58	20.42		18.95	21.05
(22)	21.58	22.42		20.95	23.05
25	24.58	25.42		23.95	26.05
(28)	27.58	28.42		27.95	29.05
30	29.58	30.42		28.95	31.05
35	34.5	35.5		33.75	36.25
40	39.5	40.5		38.75	41.25
45	44.5	45.5		43.75	46.25
50	49.5	50.5		48.75	51.25
55	54.4	55.6		53.5	56.5
60	59.4	60.6		58.5	61.5
1) Dimensions in parentheses are not recommended for use.

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	6 g
	Standards	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
Final surface treatment of product		Plain. Requirements for electroplated coatings per GOST 9.301, GOST 9.303. Screws shall be manufactured with coatings: zinc chromated, nickel, oxide impregnated with oil, phosphate impregnated with oil, or without coating. Other types of coatings may be used by agreement between the manufacturer and the consumer
Acceptance		Acceptance rules - GOST 17769
Test methods		Dimensions, form and position tolerances of surfaces - 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.

Flat-point straight slotted set screw, product grade B, thread diameter d = 10 mm, tolerance field 6g, length l = 25 mm, property class 14H, without coating:

Screw M10-6g×25.14H GOST 1477-93

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 1477-93

Same, made of brass LS 59-1, without coating:

Screw A.M10-6g×25.32.LS 59-1 GOST 1477-93

Appendix (reference)

Table 3 — Mass of screws

Length l, mm	Theoretical mass of 1000 pcs of steel screws, kg ≈, at nominal thread diameter d, mm
	1	1.2	1.6	2	2.5	3	(3.5)	4	5	6	8	10	12
2	0.007	0.010	0.020	0.030
2.5	0.010	0.014	0.026	0.040	0.060
3	0.012	0.018	0.030	0.049	0.078	0.108
4	0.016	0.024	0.042	0.068	0.108	0.152	0.210	0.261
5			0.053	0.086	0.138	0.196	0.290	0.339	0.469
6			0.065	0.105	0.168	0.240	0.360	0.416	0.593	0.840
8			0.088	0.142	0.228	0.328	0.510	0.571	0.840	1.193	2.039
10				0.180	0.289	0.416	0.660	0.726	1.088	1.545	2.675	4.101
12					0.349	0.504	0.820	0.881	1.335	1.898	3.312	5.112	7.480
(14)						0.593	0.970	1.036	1.582	2.251	3.949	6.110	8.934
16						0.681	1.020	1.191	1.830	2.604	4.586	7.113	10.390
(18)							1.270	1.345	2.077	2.956	5.223	8.124	11.843
20							1.420	1.500	2.324	3.309	5.859	9.121	13.301
(22)								2.029	2.572	3.662	6.496	10.133	14.752
25									2.943	4.191	7.451	11.632	16.933
(28)										4.720	8.406	13.144	19.124
30										5.073	9.043	14.142	20.571
35											10.635	16.652	24.212
40											12.227	19.162	27.841
45												21.672	31.484
50												24.182	35.113
55													43.500
60													48.840
Note - To determine the mass of screws made of other materials, the mass values given in the table shall be multiplied by the following factor: 0.356 for aluminium alloy; 0.97 for bronze; 1.08 for brass.

Informational data

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 438, DIN 551.