Castle Nuts

Anchor Bolts

Castle nuts, also known as castellated nuts, have slots (notches) cut into one end. These slots are used to secure the nut with a cotter pin, preventing it from turning and loosening. They are commonly used in applications where the nut must be secured after tightening.

  • Slots for securing with a cotter pin
  • Prevents rotation and loosening
  • Used in automotive and machinery applications
  • Ideal for applications requiring precise locking
  • Commonly used with bolts that have a drilled hole

Anchor Bolt Specification Table

SpecificationDescription
ASTM F1554Specification for anchor bolts, steel, 36, 55, and 105-ksi yield strength
AISC 360Specification for structural steel buildings, including anchor bolt requirements
ACI 318Building code requirements for structural concrete, detailing anchor bolt usage
ISO 898-1Mechanical properties of fasteners made of carbon steel and alloy steel

Castle Nuts Dimensions Chart:

Metric Technical Data
Thread DiameterS (mm)E (mm)M max. (mm)W max. (mm)N min. (mm)
M477.7453.21.2
M588.87641.4
M61011.057.552
M71112.1285.52
M81314.389.56.52.5
M101718.91282.8
M121921.115103.5
M142224.4916113.5
M162426.7519134.5
M182729.5621154.5
M203032.9522164.5
M223235.0326185.5
M243639.5527195.5
M274145.230225.5
M304650.8533247
M335055.3735267
M365560.7938297
M396066.4440317
M426571.346349
M457078.2648369
M487582.650389
M528088.2554429
M568595.0757459
M5890100.72634811
M6090100.72634811
M6495106.37665111
M68100112.02695411
M72105117.67735811
M76110123.32766111
M80115128.97796411
M85120134.62886814
M90130145.77927214
M95135151.42967614
M100145162.721008014

Flange Nut Applications:

  • Automotive assemblies to reduce vibration and distribute load
  • Construction projects requiring secure and even fastening
  • Machinery and equipment where a washer is not required
  • Heavy-duty industrial applications
  • Electrical and electronic enclosures
  • Applications in marine and offshore environments