The Multiquip 21575 SHC Screw 5/16-18 x 3/4 Stainless is a genuine OEM fastener designed for Whiteman ride-on power trowels in the HTX44 and STX55 series. As a direct OEM replacement, part 21575 delivers the exact thread pitch, head geometry, and stainless steel material grade specified by Multiquip for these machines. Confirmed fitment includes HTX44K4, HTX44K5, HTX44Y4, HTX44Y5, STX55J6, STX55Y6, STXD6i, and HTXD6i models. Sourced through DHS Equipment, this part ships as a verified Multiquip OEM component so you can complete your service or repair with confidence.
Key Features
- Stainless Steel Construction — Corrosion-resistant stainless steel maintains clamp load and structural integrity in the wet, abrasive environment of concrete finishing work.
- Correct Thread Specification — 5/16-18 UNC thread form and 3/4-inch length match the original fastener spec exactly, seating flush without over- or under-torquing the joint.
- Socket Head Cap (SHC) Drive — Hex socket drive allows high torque application in tight or recessed bolt bosses common on trowel frames and guard assemblies.
- Broad HTX and STX Series Coverage — Fits HTX44K4, HTX44K5, HTX44Y4, HTX44Y5, STX55J6, STX55Y6, STXD6i, and HTXD6i hydrostatic ride-on trowels from Multiquip's Whiteman lineup.
- Genuine OEM Part — Manufactured to Multiquip's original specification, ensuring the fastener performs as intended throughout the service life of the machine.
A socket head cap screw serves as a precision structural fastener, using an internal hex drive to draw two components together under controlled clamping force. On ride-on power trowels, fasteners like the Multiquip 21575 secure guards, frame panels, and drive components that must remain firmly in place under continuous vibration and load. Using the correct stainless steel grade and thread specification prevents loosening, galling, and corrosion that can lead to component movement, uneven trowel blade performance, or accelerated wear on the surrounding material.
Part Details
| Part Number | 21575 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | SHC Screw 5/16-18 x 3/4 Stainless |
Compatibility & Fitment
| Name | Model |
|---|---|
| Whiteman Ride-On Power Trowels | HTX44K4 |
| Whiteman Ride-On Power Trowels | HTX44K5 |
| Whiteman Ride-On Power Trowels | HTX44Y4 |
| Whiteman Ride-On Power Trowels | HTX44Y5 |
| Whiteman Ride-On Power Trowels | STXD6i |
| Whiteman Ride-On Power Trowels | HTXD6i |
| Whiteman Ride-On Power Trowels | STX55J6 |
| Whiteman Ride-On Power Trowels | STX55Y6 |
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.
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