DIN 6925 Hexagon All-Metal Self-Locking Nut

DIN 6925 is a hexagon self-locking nut made entirely of metal. It has no plastic inserts or other non-metallic elements, so it can be used across a wide temperature range.

The main difference from other types of fasteners is the presence of a clamping element that prevents the connection from loosening on its own. Self-locking nuts are used in the assembly of units and assemblies subject to dynamic loads and vibration. The use of such fasteners prevents the reliability of the connection from decreasing over time.

Material and coating

The fasteners are made of carbon steel with property class 8 or 10 – such alloys are designed for strong mechanical loads. To increase resistance to external factors, the metal is coated with chrome, nickel or zinc applied by electroplating. Zinc-plated and other nuts can withstand corrosion for a long time.

The products have the following dimensional characteristics:

• The thread diameter can range from M6 to M36.
• The nut height ranges from 6 to 55 mm.
• The width across flats of the nut varies from 10 to 24 mm.
• The height of the hexagonal main part of the nut up to the tapered clamping element ranges from 1.6 to 23 mm.

Nuts of this type have a fairly large height, which increases the size of the connection. However, they do not require additional washers or other elements to prevent the connection from loosening.

Application

Self-locking fasteners are used in various areas of machine building: in the assembly of vehicles, ships, aircraft, machine tools, industrial equipment, and more. Such nuts improve the reliability of part fastening and extend the trouble-free service life of assemblies. Thanks to corrosion-resistant materials, they can serve for a long time and withstand aggressive environmental impact.

Dimensions of DIN 6925 hexagon self-locking nuts, mm:

d	s	h	m	e min
M3	5.5	3.7	2.0	6.01
M4	7	4.2	2.2	7.66
M5	8	5.1	2.75	8.79
M6	10	6	3.3	11.05
M7	11	7	3.8	12.12
M8	13	8	4.4	14.38
M10	16	10	5.5	17.77
M12	18	12	6.6	20.03
M14	21	14	7.7	23.35
M16	24	16	8.8	26.75
M20	30	20	11.0	32.95
M24	36	24	13.2	39.55
M30	46	30	16.5	50.85
M36	55	36	19.8	60.7

d	h	m’ DIN/ISO	s
M3	3.7	1.65/-	5.5
M4	4.2	2.2/-	7
M5	5.1	2.75/3.52	8
M6	6	3.3/3.92	10
M8	8	4.4/5.15	13
M10	10	5.5/6.43	16
M12	12	6.6/8.30	18
M14	14	7.7/9.68	21
M16	16	8.8/11.28	24
M18	18	9.9/-	27
M20	20	11/13.52	30
M24	24	13.2/16.16	36
M27	27	14.8/-	41
M30	30	16.5/19.44	46
M33	33	18.2/-	50
M36	36	19.8/23.52	55

Designations:

d - nominal thread diameter

h - nut height, max

m’ - thread part height

s - width across flats