DIN 977 Hexagon Weld Nut with Flange
Hexagon weld nut with flange DIN 977: design, dimensions, materials, zinc coating and installation. FLOK supplies the fastener per DIN 977 standard.
A weld nut with flange is a fastener that provides not a detachable but a monolithic connection between structures. These fasteners are used when assembly is performed once and subsequent disassembly is not intended.
Design features
In appearance, weld nuts with flange are similar to standard counterparts: a hexagonal shape with a threaded hole inside. These fasteners are used together with bolts, screws or studs.
The design feature is a larger-diameter flange on one side of the nut. During installation it melts and is responsible for the reliability of the connection: after welding the nut cannot be unscrewed. If disassembly is required, the fastener is cut out and replaced with a new one.
Weld nuts with flange are produced in various sizes depending on the application and the size of the structure being fastened. The most common fasteners have a hole diameter of 5, 6, 8, 10, 12, 14 and 16 mm. The flange diameter changes accordingly — for the listed hole diameters it is 15.5, 18.5, 22.5, 26.5, 30.5, 33.5 and 36.5 mm. The flange is approximately three times larger than the nut hole.
Production of weld nuts with flange
Weld nuts are stamped on special machines according to a set program.
Carbon steel or stainless steel is used as the material. To protect against external factors — temperature fluctuations, precipitation, wind, dirt — the fasteners are often coated with a layer of zinc.
Installation of a weld nut with flange
The nut, together with a bolt or screw, is tightened all the way into the structure’s hole — this can be done with an ordinary wrench. A welding machine then melts the flange: the metal softens and subsequently hardens, forming a continuous bond between the nut and the surface of the structure. The connection looks like a single piece.
| d | P | dc | h | n | k | S | N | ||
|---|---|---|---|---|---|---|---|---|---|
| fine | coarse | max. | min. | ||||||
| M5 | - | 0.8 | 15.5 | 1.7 | 4 | 5 | 4.7 | 8 | 2.9 |
| M6 | - | 1 | 18.5 | 2 | 5 | 7 | 6.64 | 10 | 5.7 |
| M8 | - | 1.25 | 22.5 | 2.5 | 6 | 10 | 9.64 | 13 | 12.2 |
| M10 | - | 1.5 | 26.5 | 3 | 7 | 13 | 12.57 | 16 | 21.8 |
| M12 | 1.5 | 1.75 | 30.5 | 3 | 8 | 15 | 14.57 | 18 | 29.4 |
| M14 | 1.5 | 2 | 33.5 | 4 | 8 | 17 | 16.16 | 21 | 45.8 |
| M16 | 1.5 | 2 | 36.5 | 4 | 8 | 19.5 | 18.66 | 24 | 63.1 |
Designations:
d - nominal thread diameter
P - thread pitch
dc - outer diameter of the flange
h - flange height
n - support width
k - nut height
S - width across flats
N - weight of 1000 nuts, kg
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