Furniture bolt DIN 603

Bolt with semi-circular head and square head, furniture DIN 603

A bolt/screw of such a well-thought-out design is most often used in the manufacture of furniture products, since due to its design, the Semi-circular head bolt with square socket head, furniture DIN 603 provides a very reliable fixation and is completely hidden in an additional recess in the hole, which makes this fastener completely invisible. easy to use. The square headrest provides protection against the bolt from twisting around the vertical axis. The bolt head itself is more of a decorative element, as it lacks a slot, so it will only be possible to fix such a screw from the threaded side with a square header approximately 5 mm wide. It should also be noted that this metal product can also be used in production to connect any wooden surfaces.

Let’s look at the most common typical characteristics of such a product:

material of manufacture (steel with a strength class from 4.6 to 8.8, galvanized steel, stainless steel, brass, plastic).
the presence of a thread (from 1\3 of the product and more).
accuracy class “C”.

The price of the finished product depends on the application. Thus, a screw with an incomplete thread is more often used in the furniture industry, and a screw with a complete thread is used in construction. The manufacturer most often recommends buying a washer (with or without a chamfer) and a nut of the required diameter for this bolt to ensure additional reliability of the connection.

Analogs of DIN 603:

GOST 7802-81 – bolts with an enlarged semicircular head and a square sub-head of accuracy class C. Compliance with DIN 603 and GOST 7802-81 standards.
ISO 8677 – bolts with a semicircular large head and a square sub-head of accuracy class C.

Marking

d1 – nominal thread diameter
P – threading step
d2 – diameter of the semicircular head
k – head height
f – height of the headrest, not less than
V is the size of the side of the square headrest
b – length of the threaded part
L – bolt length