Multiquip 503119 Lock Nut

The Multiquip 503119 Lock Nut is a genuine OEM fastener designed for use across a wide range of Multiquip equipment families, including the LS300GK concrete pump, WBH-16 and WTB-16 power buggies, PRO12 stationary mixers, AR13 and AR14 ride-on rollers, and V305 walk-behind rollers. As a verified OEM component, 503119 is produced to the same exacting standards as the original hardware installed at the factory, ensuring correct thread engagement and holding force across every application. This single part number covers an extensive fitment range — including LS300G, LS300P, WBH-16EAWD, WBH-16EAWDF, WBH-21EFP, WBH21EPA, and WTB-16PD — making it a smart stocking item for operations running multiple Multiquip machines. Sourcing direct through DHS Equipment means you receive an authentic Multiquip part with the confidence of a verified part number match.

Key Features

• Genuine OEM Fastener Grade — Manufactured to OEM thread pitch and hardness specifications, delivering the clamping force and torque retention expected in demanding construction equipment applications.
• Drop-In Hardware Replacement — Matches the original thread form and dimensions exactly, allowing direct installation without reworking mating hardware or fastener holes.
• Broad Multiquip Fitment — A single part number confirmed across concrete pumps (LS300GK, LS300G, LS300P), power buggies (WBH-16, WBH-16E, WBH-16EAWD, WTB-16, WTB-16PD), stationary mixers (PRO12, PRO12E51, PRO12E53), and rollers (AR13D, AR13H, AR14H, V305EH, V305EK).
• Vibration-Resistant Locking Design — The lock nut configuration resists loosening under sustained vibration and load cycling, which is critical on compaction, pumping, and material-handling equipment subject to constant mechanical stress.
• Prevents Fastener Failure Before It Starts — A worn or missing lock nut allows critical assemblies to work loose during operation, risking component misalignment, accelerated wear, and unplanned stoppages. Replacing on schedule keeps assemblies secured.

A lock nut is a fastener engineered to resist loosening when subjected to vibration, torque, and dynamic loads — conditions that cause standard nuts to back off over time. Unlike a plain hex nut, a lock nut incorporates a locking mechanism — such as a distorted thread section or nylon insert — that creates resistance against rotation once torqued down. On construction equipment like concrete pumps, power buggies, rollers, and mixers, fasteners are constantly exposed to engine vibration, heavy loads, and rough terrain. A lock nut that has stripped, corroded, or backed off entirely can allow structural or mechanical assemblies to shift out of alignment, leading to accelerated wear on surrounding components or sudden mechanical failure. Replacing a worn or missing lock nut promptly with the correct OEM part — such as Multiquip 503119 — is one of the simplest and most effective steps in a preventive maintenance routine.

For fitment questions or bulk pricing on Multiquip 503119, contact the DHS Equipment parts team directly.

Part Details

Compatibility & Fitment

Verify Before You Order

Fitment is machine-number and revision-specific; always confirm your model and serial number against the fitment list.

Why Buy From DHS Equipment

Every part is verified against the manufacturer's part number before it ships, so what you order is what arrives. We carry parts from leading OEM brands and our own DHS Quality Parts line of professional aftermarket components. Need help finding the right part? Our team is available to confirm compatibility whenever you need it. Orders are processed fast to keep your jobs on track. We don't just sell parts. We keep you jobsite ready.

Questions? Contact our team at [email protected] or 866-611-9369 — DHS Equipment is here to help you maintain peak performance.