1/2″ to 4″  Industrial Sealing Locknuts
Steel Construction Zinc Electroplated with Integrally Molded PVC  Gasket (SL Series)


Sealing locknuts are used for securing threaded conduit or connectors with tapered or straight thread, to a knockout or unthreaded slip hole. Heavy-duty steel rigid/IMC sealing locknut have an integrally fused PVC gasket.
With AMFICO Industrial Grade Sealing Locknuts you can functionally replace rigid threaded enclosure connectors.

At the same time, they provide a positive ground connection and economies in certain installations. When used in place of a standard locknut, AMFICO’s raintight sealing locknuts provide a seal along the inside edge of your enclosure.  When used with an AMFICO UL Listed fitting you can meet any code and fill any specification.

Sealing Locknut American Fittings 1/2" to 4"

SL Series Industrial Grade  Sealing 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. Locknuts WITHOUT sealing gasket see our HDI Series Locknuts. and LN Series Locknuts

SL Series can be used with Rigid Threaded / IMC Conduit or AMFICO Cord Grips & Liquid Tight Fittings,  you can accomplish an environmental weather tight seal.

Cat Numbers & Dimensions

Sealing Locknuts American Fittings


Material Construction:  Alloy Steel, Zinc Plated with Chromate Finish<
Integrally fused PVC gasket provides a positive seal against water, oils and other liquids
Designed for use with raintight, watertight, and oil-tight enclosures


Provides a Raintight Seal
Furnished with NPS Threads
Tightens Without Deformation


* 1/2″-2″ Certified Made in the USA
2-1/2″-4″ Do Not Meet Made in the USA
UL Listed to 514B – when used with an AMFICO Fitting
NEMA Standard FB1
Federal Standard A-A-50553
Conforms to UL Standards: 514B, 467
CSA Standard: C22.2 No. 18F
RoHS Compliant
REACH Compliant
CA Prop 65 Compliant
UNSPSC 39131311

American Fittings UL Logo when used with an AMFICO Fitting