The Multiquip 21376 is a genuine OEM HHC Screw 5/8-11 x 1-1/2 designed for Whiteman ride-on power trowel models including the STX55Y6, STX55J6, STX6H, STXD6i, HTX44Y4, HTX44Y5, HTX44K4, HTX44K5, HTX6H, and HTXG6DF. As a direct OEM replacement, this fastener meets the same material and dimensional standards as the original hardware installed at the factory. Sourced directly from Multiquip, part 21376 ensures correct thread engagement and clamping load for the application it serves. DHS Equipment stocks genuine Multiquip OEM parts so you can get the right component the first time.
Key Features
- Genuine OEM Hardware Grade — Manufactured to the same thread class, shank diameter, and tensile specification as the original fastener, ensuring proper clamping force in critical trowel assemblies.
- Direct Bolt-In Replacement — 5/8-11 UNC thread and 1-1/2 inch grip length match the original mounting point exactly, allowing straightforward installation without reworking holes or mating hardware.
- Broad STX and HTX Series Fitment — Confirmed fit across STX55Y6, STX55J6, STX6H, STXD6i, HTX44Y4, HTX44Y5, HTX44K4, HTX44K5, HTX6H, and HTXG6DF Whiteman ride-on power trowels.
- Structural Integrity at Speed — A correctly torqued fastener keeps trowel components secured during high-RPM finishing passes; a loose or incorrect bolt can lead to component shift, vibration damage, or premature wear.
- Verified Multiquip Part Number — Ordering by part number 21376 eliminates substitution risk and confirms you receive the exact fastener specified for these hydrostatic and diesel ride-on trowel platforms.
A hex head cap screw is a structural fastener used to clamp two or more components together at a fixed joint within the machine. The 5/8-11 designation refers to a 5/8-inch nominal diameter with 11 threads per inch — a coarse-thread specification commonly used in high-load structural connections. When a fastener of this type loosens, stretches beyond its elastic limit, or is replaced with an incorrect grade or thread pitch, the joint it secures can shift under load, accelerating wear on mating surfaces and potentially causing component separation during operation.
Part Details
| Part Number | 21376 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | HHC Screw 5/8-11 x 1-1/2 |
Compatibility & Fitment
| Name | Model |
|---|---|
| Whiteman Ride-On Power Trowels | STX55Y6 |
| Whiteman Ride-On Power Trowels | STX6H |
| Whiteman Ride-On Power Trowels | HTXG6DF |
| Whiteman Ride-On Power Trowels | HTX6H |
| Whiteman Ride-On Power Trowels | STXD6i |
| Whiteman Ride-On Power Trowels | HTX44Y5 |
| Whiteman Ride-On Power Trowels | HTX44Y4 |
| Whiteman Ride-On Power Trowels | STX55J6 |
| Whiteman Ride-On Power Trowels | HTX44K5 |
| Whiteman Ride-On Power Trowels | HTX44K4 |
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.
