Used with regular square nuts to create a vibration resistant fit. When the MF lock nut contacts the reqular nut, turn an additional 1/2 to 3/4’s turn with wrench to firmly lock in place.

Quan Pham brand of pole line construction fasteners consist of machine and carriage bolts, flat, curved square and round washers, lock washers, washer nuts, locknuts, staples and lag screws. All products are designed and manufactured per applicable electric utility and communications industry standards.

  • For 3/8″ diameter bolt, tapped 3/8-16-UNC
  • Hot dip galvanized per ASTM A-153
  • RUS listed, ek – Locknut.


Coating Galvanized, ASTM A-153
Material Steel
UPC 096359070207


Dimensions 0.625 in x 0.625 in x 0.250 in
Height 0.250 in
Length 0.625 in
Weight 0.01 lb
Width 0.625 in

Certifications and Compliance

RUS Listed Reference ek – Locknut