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Serrated flange nuts

A flange nut is a nut that has a wide flange at one end that acts as an integrated washer. This serves to distribute the pressure of the nut over the part being secured, reducing the chance of damage to the part and making it less likely to loosen as a result of an uneven fastening surface. These nuts are mostly hexagonal in shape and are made up of hardened steel and often coated with zinc.

Flange nuts (and bolts) are widely used in automobiles and electronic products.

Variants

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Serrated flange nut

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The flange may be serrated to provide a locking action. On a serrated flange nut, the serrations are angled such that they keep the nut from rotating in the direction that would loosen the nut. Because of the serrations they cannot be used with a washer or on surfaces that must not be scratched. The serrations help in preventing the vibration of the nut from moving the fastener, thus maintaining the holding power of the nut.[1]

Self-aligning nut

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A self-aligning nut, also known as a spherical nut[2] or leveling nut, is a type of nut used in applications where the fastener is not perpendicular to the surface to which the nut anchors. A flange nut is used inside a specially shaped dished-out washer. The device is commonly used in the aerospace industry. If this nut were not used the object would have to be spot faced so as to provide a surface perpendicular to the fastener.[3]

Standards

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The following specifications define flange nuts:

  • ASME B18.2.2 [4]
  • ISO 4161[5]
  • DIN EN 1661, and the DIN 6923 which it has superseded
  • JIS B 1190
  • JASO F 126 (used in the Japanese automotive industry)

See also

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References

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  1. ^ Barrett, Rich, Fastener Design Manual (PDF), retrieved 2012-08-03.
  2. ^ Spherical nuts & washers, archived from the original on 2016-02-21, retrieved 2009-04-20.
  3. ^ Smith, Carroll (1990), Carroll Smith's Nuts, Bolts, Fasteners, and Plumbing Handbook, MotorBooks/MBI Publishing Company, p. 108, ISBN 0-87938-406-9, archived from the original on 2015-11-05.
  4. ^ ASME B18.2.2 Nuts for General Applications: Machine Screw Nuts, Hex, Square, Hex Flange, and Coupling Nuts (Inch Series).
  5. ^ DIN 6923 - flange nut specification.

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Spotface

can obviate spotfacing for some applications. For example, a self-aligning nut allows the nut to find its own perpendicularity to the thread axis by floating

Washer (hardware)

normally used to distribute the load of a threaded fastener, such as a bolt or nut. Other uses are as a spacer, spring (Belleville washer, wave washer), wear

Counterbore

head on a non-perpendicular surface. If this is not feasible then a self-aligning nut may be required. By comparison, a countersink makes a conical hole

Blind mate connector

snapping the plugs, without requiring wrenches or other tools. They have self-aligning features which allows a small misalignment when mating. Electrical blind

Clear aligners

the Incremental Distance of Tooth Movement per Aligner while Maintaining Overall Rate of Movement on Self-Reported Discomfort in Invisalign Patients (PDF)

Furniture screw

A furniture screw can refer to any type of screw (and sometimes nut) used on furniture. Different types of screws have different uses in furniture. According

Simple machine

by turning it, and one can move the nut along the shaft by turning it, but no amount of pushing the screw or the nut will cause either of them to turn.

Presta valve

setups. It consists of an outer valve stem and an inner valve body. A lock nut to secure the stem at the wheel rim and a valve cap may also be present.