GOST 1478-93 Dog-Point Straight Slotted Set Screws. Product Grades A and B. Specifications

Foreword

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 GOST 1478-93 was put into effect as a state standard of the Russian Federation on 1 January 1995, replacing GOST 1478-84.

INTERSTATE STANDARD
DOG-POINT STRAIGHT SLOTTED SET SCREWS. PRODUCT GRADES A AND B. SPECIFICATIONS Dog-point straight slotted set screws. Product grades A and B. Specifications	GOST 1478-93 (ISO 7435-83)

Effective date 1995-01-01

This standard applies to dog-point straight slotted set screws of product grades A and B with a nominal diameter from 1.6 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

1.1. Screw dimensions shall conform to those shown in the figure and Table 1.

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

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

Table 1

In millimeters

Nominal thread diameter d					1.6	2	2.5	3	(3.5)	4	5	6	8	10	12
Thread pitch P					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			0.55	0.75	1.25	1.75	1.95	2.25	3.2	3.7	5.2	6.64	8.14
		max			0.8	1	1.5	2	2.2	2.5	3.5	4	5.5	7	8.5
n		nom.			0.25	0.25	0.4	0.4	0.5	0.6	0.8	1	1.2	1.6	2
		min			0.31	0.31	0.46	0.46	0.56	0.66	0.86	1.06	1.26	1.66	2.02
		max			0.45	0.45	0.6	0.6	0.7	0.8	1	1.2	1.51	1.91	2.31
t		min			0.56	0.64	0.72	0.8	0.96	1.12	1.28	1.6	2	2.4	2.8
		max			0.74	0.84	0.95	1.05	1.21	1.42	1.63	2	2.5	3	3.6
z		min			0.8	1	1.25	1.5	1.75	2	2.5	3	4	5	6
		max			1.05	1.25	1.5	1.75	2	2.25	2.75	3.25	4.3	5.3	6.3
l1)	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	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)	77.58	18.42	17.1	18.9
20	19.58	20.42	18.95	21.05
(22)	27, 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	34.0	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.

1.2. The theoretical mass of the 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 the following coatings: zinc chromate, 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

Designation examples

Dog-point straight slotted set screw of 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 1478-93

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 1478-93

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

Screw A.M10-6g×25.32.LS59-1 GOST 1478-93

Appendix

For reference

Table 3 — Mass of screws

Length l, mm	Theoretical mass of 1000 pcs of steel screws, kg ≈, at nominal thread diameter d, mm
	1.6	2	2.5	3	(3.5)	4	5	6	8	10	12
2	0.008
2.5	0.016
3	0.024	0.036
4	0.040	0.055	0.088
5	0.055	0.073	0.118	0.170	0.200
6	0.071	0.092	0.148	0.214	0.277	0.337
8	0.103	0.129	0.208	0.303	0.347	0.492	0.754	0.989
10		0.167	0.267	0.391	0.497	0.647	1.002	1.342	2.240
12			0.387	0.479	0.647	0.802	1.249	1.695	2.877	4.250
(14)				0.567	0.820	0.957	1.496	2.047	3.514	5.254	7.378
16				0.656	0.974	1.112	1.744	2.400	4.150	6.258	8.833
(18)					1.067	1.267	1.991	2.753	4.787	7.262	10.291
20					1.317	1.422	2.239	3.106	5.424	8.266	11.743
(22)						1.936	2.486	3.458	6.061	9.270	13.204
25							2.857	3.987	7.016	10.776	15.380
(28)								4.516	7.971	12.282	17.562
30								4.869	8.608	13.291	19.011
35								5.751	10.201	15.803	22.653
40									11.790	18.312	26.284
45										20.824	29.922
50										23.330	33.561
55											40.240
60											44.640
Note — To determine the mass of screws made of other materials, the mass values given in the table must be multiplied by the following factor: 0.356 for aluminium alloy; 0.97 for bronze; 1.08 for brass.

INFORMATIONAL DATA

REFERENCE REGULATORY AND TECHNICAL DOCUMENTS

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

Corresponds to DIN 417.