A nut is a shafted piece, which is threaden internally and used to be affixed to a screw in a threaded union in a fixed or sliding way. It is used to affix dismantleable elements.


2.1 NUTS FEATURES:
 

          1-      Number of sides: The most common are 6 or 4 sides (hexagonal or squared)

          2-      Width: Nut's length

          3-      Diameter: Must be the same than the screw

          4-      Type:: Profile of the nut


2.2 TYPES



USE

NORMS

DIN

UNE

UNE-EN

UNE-EN ISO

Hexagonal

Screwing with grat torque. The most used

431, 555, 934, 6915

4032, 4033, 4034, 8673, 8674

Hexagonal reduced

Helps the hexagonal nut to immobilize it

936



4035, 8675

Hexagonal high

Used when nut must be less resistant than the screw

6330, 6334, 30389




Hexagonal of flat sides

Ideal for screws of little diameter

431, 439



4036

Hexagonal with collar

There is no need of a supporting washer

6331


1661


Hexagonal with collar and autosecurity

Has a vulcanized hard washer and thanks to it there is no need of a supporting washer



1663, 1664, 1666, 1667


Hexagonal with spheric seat

Ideal when the supporting side is oblique towards the screw's shaft

6330




Hexagonal with battlement

Permits to shelter a flapped pin

533, 534, 935, 937




Eyebolt nut

Machinery manipulation

582




Security nut

Used as a locknut

7967




Hexagonal with projection

Once tightened the nut using its projections located in its sides, it is embeded in the piece to be affixed.

929




Autosecurity nut

Once tightened the nut using a washer the immobilization is ensured

380, 382, 385



2320, 7040, 7042, 7719, 10511, 10512, 10513

Flapped nut

Frequent manual tights, permitting its immobilization with the help of a prisioner or passer

466, 467, 6303




Lobed nut

Frequent manual tights, permitting its immobilization with the help of a prisioner or passer

6335




Butterfly

Frequent manual tights

313, 315




Nut with rung

Frequent manual tights, permitting its immobilization with the help of a prisioner or passer

6305, 6307




Handle nut

Frequent manual tights

99




Spheric nut

Frequent manual tights

319




Hatter nut

Prevents the exit of the side of the screw's rod preventing the deterioration

917, 986, 1587




Hatter nut with autosecurity

Secures the immobilization of the nut thanks to a vulcanized fibre washer

986




Squared

Permits frequent assemblies and dismantlings of great torque

557, 562, 798, 928




Octagonal

Screwed unions without great torque (electric industry, electronics, accuracy mechanisms)

431




Shrouded nut

Screwed unions without great torque (electric industry, electronics, accuracy mechanisms)

546




Slotted nut

Fixation of pieces, amounted over trees and which must be affixed and secured axially (example: bearings)

1804




Hole nut

Screwed unions without great torque (electric industry, electronics, accuracy mechanisms)

547, 548, 1816