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.

Nuts are graded with strength ratings compatible with their respective cap screws; for example, a PROPERTY CLASS 8.8 nut will be able to support the rated torque and clamp load of a PROPERTY CLASS 8.8 cap screw.

Types of nuts

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

See also

• Screw
• Capscrew
• Bolted joint
• Washer
• Cage nut