DIN 963 Countersunk Head Screw

The German standard DIN 963 covers a universal countersunk head screw with a slot recess. This is a widely used fastener, convenient for driving with a flat-blade screwdriver or power tool. It is used to create strong threaded connections of parts made of metal, wood and other materials.

The screw can be installed into a pre-tapped threaded hole or secured with nuts, with or without washers. This type of fastener helps create connections with good aesthetic qualities, since the head is fully sunk into the material and does not protrude above the surface.

Manufacturing features and sizes

The DIN 963 standard covers screws with a countersunk head and full metric thread on the metal shank. The screw is installed flush with the material, so the connection is not visible from the outside. The head location can be additionally covered with a decorative plastic cap. Before driving in the screw, a hole with a countersunk taper at the top is drilled in the material – this ensures optimal seating of the fastener and its complete submersion into the material.

Fasteners of this type can have a metric thread diameter from M4 to M16. The length of the shank can range from 4 to 100 mm, the choice depends on the dimensions of the parts being joined and the installation conditions.

The Russian equivalent of this type of fastener product is the screw manufactured to GOST 17475-80. In the international system, equivalents are manufactured to ISO 2009. An equivalent does not guarantee an exact match on all characteristics.

Materials

Fastener products can be made of steel with property class 4.8 or 8.8, the choice depends on the usage conditions of the screws and the load applied to them. The steel is protected from corrosion with a zinc, nickel or chrome coating, applied by electroplating. A thin protective metal layer prevents contact with a destructive external environment, so the fastener is not subject to corrosion and lasts significantly longer.

Countersunk head screws can also be made of stainless steel A2 and A4. Such fasteners are needed for use in conditions of increased corrosive activity of the environment, for example, in high humidity or in the presence of aggressive chemical vapors in the air. The fasteners are also made of brass, non-ferrous metal alloys and plastic.

Where are DIN 963 screws used?

Fasteners of this type are widely used in industry: they are used for the needs of mechanical engineering, instrument engineering, machine tool building and other sectors. They have also become in demand in furniture manufacturing: the screw is fully sunk into the material, so it is not visible from the outside and does not spoil the appearance of the product. Under this standard, universal fastener products are produced that can be used in dozens of applications, including construction and the assembly of metal frames.

FLOK supplies fasteners of this type. Each batch of goods undergoes mandatory inspection. If an equivalent needs to be selected, FLOK consultants will help find a suitable option.

d	M1	M1.2	M1.4	M1.6	M2	M2.5	M3	M3.5	M4	M5	M6	M8	M10	M12	M16	M20
dk ISO/DIN	1.9	2.3	2.6	3	3.8	4.7	5.5/5.6	7.3/6.5	8.4/7.5	9.3/9.2	11.3/11	15.8/14.5	18.3/18	22	29	36
k ISO/DIN	0.6	0.72	0.84	1/0.96	1.2	1.5	1.65	2.35/1.93	2.7/2.2	2.7/2.5	3.3/3	4.65/4	5	6	8	10
b	1)	1)	1)	15	16	18	19	38	22	25	28	34	40	46	58	70
n	0.25	0.3	0.3	0.4	0.5	0.6	0.8	1	1.2	1.2	1.6	2	2.5	3	4	5

Designations:

d - nominal thread diameter

dk - countersunk head diameter

k - head height

b - thread length of the screw, min. 1) - thread up to the head

n - width of the screw head slot