DIN 913 Set Screw with Hex Socket and Flat Point

The German manufacturing standard DIN 913 covers headless set screws – this fastener is designed for reliable fixation of parts and protection against displacement. Set screws prevent self-loosening of an assembly under constant dynamic and vibration loads. This type of fastener is made as a metal rod with a flat point and full metric thread. On the opposite end face there is an internal hex socket. DIN 913 fasteners are known for high strength and durability.

Manufacturing and application features

The set screw is designed for installation into a pre-drilled and tapped hole. It has no head, so it is fully recessed into the hole, making this fastener invisible from the outside. The hex socket allows it to be driven with a wrench at high tightening torque, ensuring strength and reliability of the joint. It is protected against self-loosening.

A set screw of this type resembles a threaded stud in configuration, with thread diameter from M1.6 to M20; overall length of the product can range from 2 to 120 mm. When selecting, make sure the dimensions of the prepared hole match. This product can be installed with power tools – a screwdriver, drill, etc. The internal socket matches the tip of an installation hex bit, so using power tools allows installation with one hand.

The fastener has a blunt end, which means no recess needs to be made in the base before driving the screw. The head with internal socket has anti-vandal properties: it cannot be unscrewed with ordinary tools, a special installation wrench is required.

Materials

The most common version of this fastener is set screws made of steel 45H, characterized by high strength. For corrosion protection, this fastener can additionally be supplied with a protective coating of zinc or nickel. A thin layer of non-ferrous metal provides insulation from the external corrosive environment, extending the service life of the product.

If the joint will be exposed to high humidity or increased acidity, fasteners made of stainless steel should be used. Alloys A2 and A4 are used for production, offering excellent corrosion resistance. The service life of such fasteners is practically unlimited – they can be used for years in harsh conditions while ensuring high joint reliability. Fasteners are also made from brass and other non-ferrous alloys.

Applications

Set screws of this type are most widely used in mechanical engineering, machine-tool building and other industrial manufacturing sectors. They are used in the assembly of automobiles and other vehicles, installation and assembly of metal frames, and in furniture production.

FLOK supplies DIN 913 set screws with flat point for the applications listed above. The products meet the requirements of the standard.

Dimension table for DIN 913 (ISO 4026) set screws with flat point, in mm

d		M1.4	M1.6	M2	M2.5	M3	M4	M5	M6	M8	M10	M12	M16	M20	M24
P		0.3	0.35	0.4	0.45	0.5	0.7	0.8	1	1.25	1.5	1.75	2	2.5	3
dp		0.45	0.8	1	1.5	2	2.5	3.5	4	5.5	7	8.5	12	15	18
s		0.7	0.7	0.9	1.3	1.5	2	2.5	3	4	5	6	8	10	12
t	short	0.6	0.7	0.8	1.2	1.2	1.5	2	2	3	4	4.8	6.4	8	10
	long	1.4	1.5	1.7	2	2	2.5	3	3.5	5	6	8	10	12	15
l
2		#	#	#
2.5		#	#	#	#
3		+	+	#	#	#
4		+	+	+	+	#	#
5		+	+	+	+	+	#	#
6		+	+	+	+	+	+	#	#
8			+	+	+	+	+	+	+	#
10				+	+	+	+	+	+	+	#
12					+	+	+	+	+	+	+	#
16						+	+	+	+	+	+	+	#
20							+	+	+	+	+	+	+	#
25								+	+	+	+	+	+	+	#
30									+	+	+	+	+	+	+
35										+	+	+	+	+	+
40										+	+	+	+	+	+
45											+	+	+	+	+
50											+	+	+	+	+
55												+	+	+	+
60												+	+	+	+

Designations:

d - nominal thread diameter

P - thread pitch

dp - diameter of flat point, max.

s - width across flats

t - screw socket depth, min

l - screw length

# - short screws with mandatory 120° chamfer angle

+ - long screws with 90° chamfer angle