DIN 546 Round Slotted Nut

DIN 546 is a German standard governing round nuts with a metric threaded hole. The distinctive feature of this fastener is a straight slot, which allows the nut to be tightened with a standard flat-tip screwdriver.

This makes it suitable for installation in cylindrical parts where tightening with a wrench is not possible. The product can be used together with bolts, washers and other fasteners of the matching diameter.

Materials and features

Round slotted nuts can be made from high-strength carbon steel grades — such products are used in assembling critical joints. The metal is coated with zinc, nickel or chromium plating, providing long-term corrosion protection. The protective layer is applied by electroplating. For products operating in corrosive environments, stainless steel grades A1–A5 are used, which are resistant to the destructive effects of the environment. Production from brass and other non-ferrous alloys is also possible.

Nuts of this type have the following characteristics:

• Thread diameter — from M3 to M16.
• Outer diameter of the product — from 6 to 26 mm.
• Maximum height of the product — from 2.5 to 12 mm.
• Straight slot width from 1.2 to 4 mm.

A similar fastener is manufactured in accordance with the Russian standard GOST 10657-80.

Application

Nuts of this type are used in mechanical engineering industries: in automotive manufacturing, in the assembly of components and assemblies in machine-tool building, instrument making and other fields. High strength and corrosion resistance broaden the application range — such fasteners are used where standard hexagon nuts cannot be used.

Dimensions of round slotted nuts DIN 546:

d	M1.4	M1.6	M2	M2.5	M2.6	M3	M4	M5	M6	M8	M10	M12
d₁	3	3.5	4.5	5.5	5.5	6	8	9	11	14	18	21
m	1.4	1.6	2	2.2	2.2	2.5	3.5	4.2	5	6.5	8	10
n	0.4	0.5	1	1.2	1.2	1.2	1.4	2	2.5	3	3.5	4
t min	0.5	0.6	0.8	0.9	0.9	1	1.2	1.5	2	2.5	3.2	3.8

d	M3	M4	M5	M6	M8	M10	M12	M16
d₁	6	8	9	11	14	18	21	26
m	2.5	3.5	4.2	5	6.5	8	10	12
n	1.2	1.4	2	2.5	3	3.5	4	4
t	1	1.2	1.5	2	2.5	3.2	3.8	3.8