DIN 438 Set Screw with Drilled Point and Slot

DIN 438 is the standard for set screws with a drilled point and slot — fasteners used to secure parts relative to one another. A distinctive feature of this fastener is the absence of a head: one end of the screw has a slot for driving it into the material with a flat screwdriver. Metric thread runs along the entire length of the shank.

Application and materials

DIN 438 set screws are made from the following materials:

• High-strength steel grade 14H.
• Steel with electrolytic zinc plating.
• Stainless steel A2, A4, resistant to aggressive environments.
• Non-ferrous metals and alloys, including brass.
• Polymers.

The screw is fully installed into a prepared hole in the material and does not protrude above the surface. It requires pre-tapped threads in the holes of the parts being joined. Thread diameter ranges from M3 to M10.

Terms of sale

DIN 438 set screws can be ordered from the FLOK catalogue in batches of any volume.

Dimensions of DIN 438 set screws, mm:

dz max	1.4	2	2.5	3	5	6
n	0.4	0.6	0.8	1	1.2	1.6
t min	0.8	1.12	1.28	1.6	2	2.4
l	d
	M3	M4	M5	M6	M8	M10
3
4
5
6
8
10
12
14
16
18
20
22
25
28
30
35
40

d		M3	M4	M5	M6	M8	M10
P		0.5	0.7	0.8	1	1.2	1.6
dz		1.4	2	2.5	3	5	6
n		0.4	0.6	0.8	1	1.2	1.6
t		0.8	1.12	1.28	1.6	2	2.4
l	min.	3	4	5	5	8	10
	max.	25	25	30	35	40	40

Designations:

d - nominal thread diameter

df - internal thread diameter

P - thread pitch

dz - diameter of inner cone, max

n - slot width

t - screw slot depth

l - screw length