Nasa

Nut (hardware)

Welcome to our website. It is generaly simplier version of wikipedia. You will find there selected articles. Enjoy!

A nut threaded onto a bolt

A nut is a type of hardware fastener with a threaded hole. Nuts are almost always used opposite a mating bolt to fasten a stack of parts together. The two partners are kept together by a combination of their threads' friction, a slight stretch of the bolt, and compression of the parts. In applications where vibration or rotation may work a nut loose, various locking mechanisms may be employed: Adhesives, safety pins or lockwire, nylon inserts, or slightly oval-shaped threads. The most common shape is hexagonal, for similar reasons as the bolt head - 6 sides give a good granularity of angles for a tool to approach from (good in tight spots), but more (and smaller) corners would be vulnerable to being rounded off. Other specialized shapes exist for certain needs, such as wing nuts for finger adjustment and captive nuts for inaccessible areas.

Nuts are graded with strength ratings compatible with their respective bolts; for example, an ISO property class 10 nut will be able to support the bolt proof strength load of an ISO property class 10.9 bolt without stripping. Likewise, an SAE class 5 nut can support the proof load of an SAE class 5 bolt, and so on. The proof strength of the most common property classes is listed at bolted joint.

Nuts come in many sizes. This one is part of the Sydney Harbour Bridge

Types

L to R: Wing, hex, hex flange, and slab weld nuts.

L to R: Slotted, square, T, cap (or acorn), nylon locking, and castellated nuts.

Hexagon weld nuts.

• barrel nut
• cap nut (acorn nut)
• cage nut
• Clip-on nut (J-nut or U-nut)
• coupling nut
• crushed nut
• cross dowel
• flange nut (collar nut)
• insert nut
• Internal wrenching nut (Allen nut)
• knurled nut (thumb nut)
• lug nut
• panel nut
• Plate nut (nut plate)
• PEM nut (for metal)
• Rivet nut or blind nut
• Self-aligning nut
• Sex bolt
• Swage nut
• slotted nut
• split nut
• square nut
• staked/welded nut (for plastic)
• Nut-type MJT
• T-nut
• T-slot nut (T-groove) nut
• weld nut
• well nut
• wing nut

Locknuts

• Castellated nut
• Distorted thread locknut
  • Centerlock nut
  • Elliptical offset locknut
  • Toplock nut
• Interfering thread nut
  • Tapered thread nut
• Jam nut
• Jet nut (K-nut)
• Keps nut (K-nut or washer nut) with a star-type lock washer
• Nyloc plate nut
• Polymer insert nut (Nyloc)
• Serrated face nut
• Serrated flange nut
• Speed nut (Sheet metal nut or Tinnerman nut)
• Split beam nut

Standard metric hex nuts sizes

nut quotation

Classifications

This section requires expansion.

See also

• Bolted joint
• Cage nut
• Pipe cap
• Screw
• Tap
• Tapped hole
• Threaded insert
• Washer

References

Bibliography

• Bickford, John H.; Nassar, Sayed (1998), Handbook of bolts and bolted joints, CRC Press, ISBN 9780824799779, http://books.google.com/books?id=NaZwZK2xm-QC .

External links

• http://www.boltdepot.com/fastener-information/Type-Chart.aspx