Nut (hardware)

Encyclopedia : N : NU : NUT : Nut (hardware)

A nut is a type of hardware fastener with a threaded hole. Nuts are usually hexagonal to permit tightening with a wrench, but may also be square, knurled, winged, or otherwise shaped. Along with a bolt, nuts are designed to capture and fasten objects together. Without the nut the bolt would slide out.

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

wing nuts, hex nut, hex flange nut, flanged weld nuts for stud welding

slotted, square, T, cap or acorn, nylon locking (not "nylock"), and castellated nuts

• simple nut
• flange/collar nut
• locking nut
• * lug nut
• * polymer insert
• * oval lock
• * castellated nut
• * keps nut
• T-nut
• slotted nut
• weld nut
• wing nut
• knurled nut, thumb nut
• insert nut
• * rivet
• * staked/welded (for plastic)
• * Pem nut (for metal)
• turnbuckle
• T-groove nut

See also

• Tap
• Screw
• Bolted joint
• Washer
• Cage nut
• Pipe cap

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