GOST 1486-84 Square-Head Step-Point with Sphere Set Screws, Product Grades A and B. Construction and Dimensions

GOST 1486-84 applies to square-head step-point with sphere set screws of product grades A and B, with nominal thread diameter from 8 to 20 mm.

The construction and dimensions of the screws shall conform to those shown in the drawing and table.

INTERSTATE STANDARD
SQUARE-HEAD STEP-POINT WITH SPHERE SET SCREWS OF PRODUCT GRADES A AND B Construction and dimensions Square-head step-point with sphere set screws. Product grades A and B. Construction and dimensions	GOST 1486-84

Effective date 01.01.86.

Nominal thread diameter d		8	10	12	16	20
Width across flats S		8	10	12	17	22
Head height k		7	8	10	14	18
Circumscribed circle diameter e		10	13	16	22	28
Collar height k₁		2	3	3	4	5
Screw length l	14		-	-	-	-
	16			-	-	-
	20				-	-
	25					-
	30					-
	35					-
	40			Standard lengths
	45	-
	50	-
	55	-	-
	60	-	-
	65	-	-	-
	70	-	-	-
	75	-	-	-
	80	-	-	-
	90	-	-	-	-
	100	-	-	-	-

Example of designation for a product grade B screw with thread diameter d = 10 mm, tolerance class 6g, length l = 25 mm, property class 14H, without coating:

Screw B.M10-6g×25.14H GOST 1486-84

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 1486-84

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

Screw A.M10-6g×25.32 GOST 1486-84

Thread — per GOST 24705, coarse pitch. Thread runout — standard, per GOST 10549.

Radius under the head — per GOST 24670.

Screw step-point end with sphere — per GOST 12414.

Tolerances and methods for checking dimensions, form and position deviations of surfaces — per GOST 1759.1.

Surface defects and inspection methods — per GOST 1759.2.

Mechanical properties and test methods for screws: made of carbon and alloy steel — per GOST 25556; made of corrosion-resistant, heat-resistant, heat-resisting steel and non-ferrous alloys — per GOST 1759.1, GOST 1759.2, GOST 1759.4.

Screws are manufactured with the following coatings: chromated zinc, chromated cadmium, nickel, oxide impregnated with oil, phosphate impregnated with oil, or without coating.

Other technical requirements — per GOST 1759.0.

The theoretical mass of screws is given in the appendix.

Appendix (informative)

Theoretical mass of 1000 pcs. of steel screws, kg

Screw length l, mm	Nominal thread diameter d, mm
	8	10	12	16	20
14	8.57	-	-	-	-
16	9.19	15.76	-	-	-
20	10.46	17.89	27.82	-	-
25	12.06	19.97	31.53	70.76	-
30	13.73	22.49	35.15	77.28	-
35	15.30	25.00	38.76	83.84	-
40	15.90	27.52	42.46	90.58	166.22
45	-	30.07	46.09	97.15	176.72
50	-	32.55	49.69	103.85	187.12
55	-	-	53.39	110.55	197.62
60	-	-	57.01	117.05	208.02
65	-	-	-	123.95	218.42
70	-	-	-	130.55	228.82
75	-	-	-	137.15	239.22
80	-	-	-	143.85	249.72
90	-	-	-	-	270.52
100	-	-	-	-	291.32

Note. To determine the mass of screws made of other materials, the mass values given in the table are multiplied by the factor: 0.356 — for aluminium alloy, 0.97 — for bronze, 1.08 — for brass.

Referenced normative documents

Designation of the referenced regulatory document	Clause number
GOST 1759.0-87	10
GOST 1759.1-82	6, 8
GOST 1759.2-82	7, 8
GOST 1759.4-87	8
GOST 10549-80	3
GOST 12414-94	5
GOST 24670-81	4
GOST 24705-2004	3
GOST 25556-82	8

Corresponds to DIN 480.