Lock Nuts - Flange, Serrated

Serrated Flange Lock Nuts

A one piece all-metal surface-bearing lock nut- a free spinning nut that requires tightening against a surface in order for the locking mechanism to function. The bearing surface of the nut has circular serrations radiating outwards that grip when tightened on a mating surface creating. This ratchet-like locking mechanism is resistant to vibration. Because the serrations displace some of the surface material when tightened, localized corrosion may occur. The increased surface area under the flange flange increases the bearing surface of the nut allowing it to be used without additional washers or lock washers and ideal for use with poorly aligned and oversized holes. All-metal lock nuts are more resistant to higher temperatures and chemical exposure than non-metallic lock nuts (such as nylon insert lock nuts).

Material, Threading and Sizes

Available threads include standard right-hand and Unified inch coarse series (UNC, Unified National Coarse) or Unified inch fine (UNF, Unified National Fine). Sizes refers to the nut's nominal thread diameter. Nut width across flats, (wrench size), and thickness vary with nut size.

Typically, sizes range from about #4 to 7/8". Sizes less than 1/4" are listed as a number size (the larger the number the larger the size) while sizes that are 1/4" and larger are specified in inches, usually fractional rather than decimal. Serrated flange lock nuts are available in a low-carbon steel, Grade 5 steel and Grade 8 alloy steel. Available plating includes, clear zinc, black zinc, black oxide and yellow zinc. For dimensions and technical specifications click here.