1/2″ to 4″  Locknuts Commerical Grade Made in the USA*
Commercial Grade Steel Construction Zinc Electroplated (LN Series)


Conduit locknuts are used for securing threaded conduit or connectors with tapered or straight thread, to a knockout or unthreaded slip hole. They are used in dry locations to secure threaded conduit or connectors to electrical junction boxes or enclosures. Wet Locations require a sealing washer to be used or sealing locknut.

Our commercial-grade locknuts are heavy gauge steel construction that maintains mechanical protection and solid grounding of the conduit to the designated electrical junction box or enclosure. Zine electroplated provides excellent corrosion protection in damp locations. Serrated teeth on tangs bite into the box and enclosure to prevent vibratory loosening of the connection.

AMFICO Locknuts Commercial Grade Steel

LN Series Commercial Grade Lock Nuts

LN Series can be used with AMFICO Cord Grips and Liquid Tight Fittings, when combined with our SW Sealing Washers you can accomplish an environmental seal. For heavy-duty industrial applications consider our HDI Series Locknuts


Material Construction:  Alloy Steel, Zinc Plated with Chromate Finish
Solid Steel Construction Fully Precision Machined
Galvanized Plating Option Available


Furnished with NPS Threads
Hardened Tangs Bite Through Painted Enclosures
Providing Continual Bond & Excellent
Continuity of Ground
Tang Will Not Warp or Bend
Tightens Without Deformation


*1/2″ to 2″ Certified Made in the USA  

UL Listed to 514B
NEMA Standard FB1
Federal Standard A-A-50553
UL Standards: 514B, 467
CSA Standard: C22.2 No. 18F
RoHS Compliant
REACH Compliant
CA Prop 65 Compliant
UNSPSC 39131311

American Fittings UL Logo