Keep your trailer's leaf spring suspension properly assembled with this genuine Lippert replacement shoulder bolt. Designed to exact OEM dimensions for double-eye spring, hanger, and shackle link applications -- no trimming, no improvising, no undersized hardware.
Suspension hardware on trailers and RV axles takes constant stress from road vibration, load cycling, and corrosion. When a shoulder bolt in a leaf spring hanger or shackle link wears, bends, or strips, it needs to be replaced with a part that matches the original geometry -- not a generic fastener from a hardware bin.
The Lippert 122102 is a precision-ground shoulder bolt manufactured to the exact body diameter, shoulder length, and thread specification used in Lippert's double-eye leaf spring suspension assemblies. The smooth shoulder section registers inside the spring eye or shackle link bore, while the threaded end accepts the retaining nut to clamp the assembly securely.
Precision body diameter fits snugly inside spring eye and shackle link bores without slop or side play.
Exact OEM shoulder length maintains correct spring stack geometry and prevents binding.
Fine-thread specification for positive clamping with the OEM retaining nut; resists vibration loosening.
Manufactured to Lippert OEM specifications -- drop-in fitment for compatible Lippert suspension assemblies.
A shoulder bolt (also called a stripper bolt or shoulder screw) has three distinct zones: a head, a precision-ground unthreaded shoulder, and a smaller-diameter threaded end. In trailer leaf spring suspension, the shoulder is the working surface -- it rides inside the eye of the leaf spring or the bore of a shackle link, providing a low-friction pivot point. The threaded end with a nut clamps the assembly together without pulling the shoulder out of alignment.
Using a standard hex bolt as a substitute changes the effective pivot diameter, creates edge stress on the spring eye, and often results in accelerated wear or premature failure. Replacing with the correct Lippert OEM shoulder bolt restores the suspension to its engineered specification.
Because this bolt is manufactured by Lippert to their own dimensional spec, it drops directly into compatible hanger brackets and shackle kits without modification. No reaming, no shimming, no mismatched thread pitch.
This shoulder bolt is used in Lippert double-eye leaf spring suspension assemblies, which are found on a wide range of travel trailers, fifth wheels, toy haulers, and utility trailers. Common installation points include:
If your trailer's suspension uses Lippert hangers, shackles, or equalizer bars and you are seeing wear, elongation of the bolt hole, or a stripped or bent shoulder bolt, this is the correct OEM replacement part.
This part is also referenced as Lippert vendor part number 71-3827 and carries UPC 848150010742. Use these numbers to confirm you are ordering the correct bolt when cross-referencing Lippert parts catalogs or dealer invoices.
When replacing suspension shoulder bolts, inspect the hanger bracket bore and shackle link bore for elongation or wear. A worn bore will not support a new bolt properly even if the bolt itself is correct. Replace worn hangers or shackles at the same time to restore full suspension integrity.
Apply a light coat of anti-seize compound to the shoulder before installation to prevent galvanic corrosion between the bolt and the bracket bore. Torque the retaining nut to the value specified for your suspension assembly -- typically in the range of 50-75 ft-lb for 7/16"-20 fine-thread hardware, but verify against your specific Lippert suspension documentation for your axle rating.