Nuts and Washers

Standard Washer Types

Flat Washer

• • A flat washer, used to distribute load

Fender Washer

• • An oversize flat washer used to distribute load especially on soft materials.

Slip Lock Washer

• • The most common style of washer
  • Used to prevent nuts and bolt from backing out

Internal Tooth Lock Washer

• • A washer with internal "teeth"
  • Used to prevent nuts and bolts from backing out 

External Tooth Lock Washer

• • A washer with external "teeth"
  • Used to prevent nuts and bolts from backing out

Finishing Washer

• • A washer used to obtain a "finished" look. Usually used with oval head screws.

Ogee

• • Thick, large diameter, cast iron washers with a curved or sculpted appearance.
  • Commonly used in dock or wood construction

Standard Nut Types

Hex nut

• • A six-sided nut.
  • Most commonly used .

Slotted/Castle Nut

• • Slotted nuts are used in conjunction with a cotter/split pin on the drilled bolt to prevent loosening.

Wing Nuts

• • One pick nut with two wings-180° apart.
  • Used in low torque applications that require frequent adjustments.

Nylon Insert Lock Nut

• • A nut with a nylon insert to prevent backing off.
  • Also referred to as a "Nylock".
    

Coupling Nut

• • Longer than usual nuts.
  • Connects pieces of threaded rods or other male fasteners.

Jam Nut

• • A hex nut with a reduced height.

Tee Nut

• • A nut designed to be driven into wood to create a threaded hole.

K-Lock or Kep Nut

• • A nut with an attached free-spinning external tooth lockwasher.

 References

"Fastener Type Chart“. BoltDepot.com. [Online]. Available: https://www.boltdepot.com/fastener-information/type-chart.aspx [Accessed: 10-Dec-2020].

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