A small part with a critical job: this hex nut clamps your electric drum brake assembly securely to the axle spindle mounting flange. Whether you are replacing a stripped, corroded, or lost fastener during a brake job, or completing a full drum brake rebuild, having the correct OEM-spec nut on hand keeps your trailer roadworthy and your brake geometry where it belongs.
The Lippert 122085 is a precision hex nut with a 7/16"-20 fine-thread specification, engineered to fasten electric drum brake backing plates to the spindle mounting flange on 3,500 lb and 10,000 lb capacity axles. It is sold individually and is a direct OEM replacement for axle assemblies that use a 4-bolt or 7-bolt pattern on the brake flange.
This nut is also cross-referenced as Jayco part number 70023192, making it a convenient sourcing option for Jayco trailer and fifth-wheel owners who need an exact replacement. Lippert axles are found across dozens of RV and trailer brands, so this fastener covers a wide range of applications in the Lippert and compatible Dexter axle ecosystem.
7/16"-20 fine thread matches OEM axle spindle flange hardware for a secure, rattle-free fit.
Fits both 3,500 lb and 10,000 lb rated axle hubs with 4-bolt or 7-bolt brake mounting flanges.
Listed as Jayco part number 70023192 -- a direct drop-in for Jayco trailer brake service.
Backed by Lippert's limited 1-year manufacturer warranty for peace of mind on safety-critical hardware.
During routine brake service -- relining shoes, replacing a worn drum, or swapping a damaged backing plate -- the mounting flange nuts are often the first casualty of corrosion or over-torquing. Using a non-OEM substitute with incorrect thread pitch or grade can result in loose brake assemblies, vibration, or fastener failure on the road.
The 122085 nut is designed for axle hub assemblies that use either a 4-bolt or 7-bolt mounting pattern on the brake backing plate flange. This covers a broad range of Lippert and Dexter-style electric drum brake configurations used on travel trailers, fifth wheels, horse trailers, and utility trailers.
This nut is rated for use on both 3,500 lb axles (common on single- and tandem-axle travel trailers) and 10,000 lb axles (found on heavy fifth wheels, toy haulers, and large horse trailers). The same 7/16"-20 hardware specification is used across this range of Lippert axle capacities, keeping replacement parts sourcing simple.