DIN 439 Hexagon Thin Nut with Chamfer, Form A

The European standard DIN 439 was developed for thin nuts with fine thread; form A features a chamfer. A distinctive feature of this fastener is its reduced height: the nut is used in confined-space conditions for joining parts, but it has somewhat lower strength as a result. For this reason it is used in joints that are not subject to constant heavy loads. The nuts provide reliable and durable threaded connections of parts.

Design features and existing equivalents

DIN 439 covers reduced-height nuts with nominal thread diameter from M2 to M52. This form reduces installation space, which is why the fastener is in demand for assembling instruments, mechanisms, and units. The nut has the classic hexagon shape and is convenient to tighten with a wrench of the appropriate size.

The main material for manufacturing this fastener is carbon steel of hardness 14H / 17H. It may remain uncoated, but fasteners with a zinc coating are more commonly used. The fastener is also made from stainless steel grades A2 and A4 — these grades offer the highest resistance to corrosion and chemically aggressive substances. Nuts are also manufactured from non-ferrous metals and alloys.

This type of fastener has several characteristic features:

• Fine thread pitch. As a result, the nut connects most tightly and reliably with the threaded fastening element.
• The option of manufacturing with right-hand and left-hand thread. The first type remains more common.
• A protective zinc or nickel coating applied by electroplating — this provides the product with strong corrosion protection.
• The nominal thread diameter of the nuts ranges from M3 to M30; the wide range of sizes allows a suitable solution to be selected.

Thin nuts of this type are also manufactured to the Russian standard GOST 5916-70 and the international standard ISO 4035. These equivalents make it possible to select suitable fasteners from Russian and foreign manufacturers.

Application possibilities of the product

Reduced-height nuts are a practical solution for assembling mechanism parts in confined conditions. When space is limited, thin nuts take up less room. However, they have relatively low strength, so they are not used in critical load-bearing joints.

Thin nuts with fine thread provide secure fastening of products made of wood, plastic, and metal, and are suitable for working with thin sheet materials.

FLOK supplies fasteners and hardware: the catalogue offers a wide range of sizes for this nut. The fasteners are supplied in wholesale batches. A discount system is in place for regular wholesale customers.