DIN 982 Hexagon Self-Locking Nut, High

The DIN 982 standard covers hexagon self-locking nuts fitted with special sealing rings made of nylon. These are high nuts: the greater height increases the number of thread engagements, which in turn improves the reliability of the threaded connection and improves alignment of the fastener in the hole. The special nylon insert prevents the bolt or stud from turning and keeps the connection from loosening on its own.

As the fastener is tightened, the insert deforms and securely holds it in the hole: even under strong vibration and dynamic loads, the connection remains tight and reliable.

Nut material

Nuts of this type are manufactured from the following material variants:

• Carbon steel with property classes ranging from 5 to 12. High-strength nuts are used where the connection is subject to the most severe mechanical loads. The metal may be coated with a thin layer of zinc applied by electroplating. The zinc coating provides high resistance to the destructive effects of the environment.
• Stainless fasteners of grades A2 and A4. Stainless steel is used for nuts intended for use in corrosive environments and conditions of constantly elevated humidity.

Similar products are manufactured to the Russian standard GOST R 50273-92, which covers self-locking nuts with non-metallic inserts. Products of similar purpose are also produced to the international standards ISO 10512 and ISO 7040. When selecting equivalents, possible differences in dimensions must be taken into account.

Technical specifications

Products of this type are manufactured in accordance with the following standard parameters:

• The nominal thread diameter can range from M3 to M24.
• The standard height of the nuts ranges from 4.7 to 28 mm.
• The height of the hexagonal part of the product ranges from 2.15 to 20.2 mm.
• The width across flats of the nut ranges from 5.5 to 36 mm.

Products with a thread diameter up to M16 are manufactured to product grade A, while larger nuts may be manufactured to product grade B.

Application options

Self-locking nuts fitted with a non-metallic insert are widely used in various mechanisms and assemblies where it is necessary to protect the connection of parts from self-loosening. Such nuts are designed for single use: when the bolt is installed, the nylon insert deforms and prevents the fastener from moving back out of the hole.

Products of this type are used in mechanical engineering: in machine tool building, automotive manufacturing, industrial equipment, instruments, and more. The use of such nuts increases the reliability of mechanisms operating under heavy loads.

FLOK supplies self-locking nuts in large and small wholesale batches across Russia. The products are manufactured in strict accordance with the requirements of the standards.

Dimension table of high hexagon self-locking nuts DIN 982 (ISO 7040) in mm

d	h DIN/ISO	m	s DIN/ISO
M3	4.5	2.15	5.5
M4	6	2.9	7
M5	6.3/6.8	4.4	8
M6	8	4.9	10
M8	9.5	6.44	13
M10	11.5/11.9	8.04	17/16
M12	14/14.9	10.37	19/18
M14	16/17	12.1	22/21
M16	18/19.1	14.1	24
M20	22/22.8	16.9	30
M24	28/27.1	20.2	36

Designations:

d - nominal thread diameter

h - nut height

m - thread engagement height, min.

s - width across flats