Multiquip 21342 Hex Fin Nut 3/8-24 L.H. Thd

The Multiquip 21342 Hex Fin Nut 3/8-24 L.H. Thd is a genuine OEM hex fin nut designed for Whiteman ride-on power trowel models including HTX44K4, HTX44K5, HTX44Y4, HTX44Y5, STX55J6, STX55Y6, STXD6i, HTXD6i, and HTXG6DF. As a genuine OEM component, part 21342 is manufactured to the same specification as the original hardware, ensuring correct thread engagement on left-hand threaded fastener positions. Sourced directly through authorized Multiquip distribution, this nut is the correct replacement when servicing blade pitch assemblies or other left-hand threaded connections on HTX and STX series trowels. DHS Equipment stocks genuine Multiquip parts to help you get your machine back to work with the right part the first time.

Key Features

• Genuine OEM Hardware Specification — Left-hand thread form and fin flange profile match the original fastener exactly, maintaining correct clamping load and thread integrity in critical trowel assemblies.
• Left-Hand Thread Design — The 3/8-24 L.H. thread prevents loosening under rotational forces common in trowel blade and rotor hardware, making thread direction a functional requirement, not a preference.
• Broad HTX and STX Series Fitment — Confirmed fit across HTX44K4, HTX44K5, HTX44Y4, HTX44Y5, STX55J6, STX55Y6, STXD6i, HTXD6i, and HTXG6DF ride-on power trowels.
• Fin Flange Retention — The integrated fin flange provides locking resistance without a secondary lock washer, simplifying reassembly and maintaining torque retention in high-vibration environments.
• Direct Drop-In Replacement — Replaces part 21342 on a like-for-like basis with no modification to mating hardware or fastener bosses required.

A hex fin nut is a standard hex nut with an integrated serrated or finned flange at its base that bites into the mating surface when torqued, providing resistance to vibration-induced loosening. On ride-on power trowels, rotor and blade assemblies generate continuous vibration and rotational stress that can cause conventional fasteners to back out over time. The left-hand thread on this nut is a deliberate engineering choice — components that rotate in a clockwise direction will naturally tend to unscrew a right-hand threaded nut, so a left-hand thread counteracts that tendency and keeps the fastener secure during operation. A missing or damaged nut in these positions can result in blade pitch instability or component separation, making timely replacement essential to safe trowel operation.

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.