Nut (hardware)

Nut (hardware)

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Nut (hardware)

Hex nuts, DIN 6915 and UNI 5587.

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 rounding 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.

Types of nuts

L to R: Wing, hex, hex flange, and flanged weld (for stud welding) nuts.

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

barrel nut
cap nut (acorn nut)
cage nut
castellated nut
coupling nut
flange nut (collar nut)
hex nut
insert nut
jam nut
Keps nut (K-nut, washer nut)
knurled nut (thumb nut)
locking nut or lock nut
lug nut
oval lock nut (Cleveloc)
panel nut
PEM nut (for metal)
polymer insert nut (Nyloc nut)
Rivnut or blind nut
serrated face nut
slotted nut
speed nut (stamped from sheet metal)
split nut
split beam nut (Aerotight "stiff nut")
square nut
staked/welded nut (for plastic)
T-nut
T-slot nut (T-groove) nut
turnbuckle
weld nut
well nut
crushed nut
wing nut

External links

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

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Nut (hardware)

Types of nuts

See also

External links