Multiquip 20875 Screw FHSC 5/16-18 x 3/4

The Multiquip 20875 is a genuine OEM Screw FHSC 5/16-18 x 3/4 designed for a wide range of Multiquip and Whiteman walk-behind and ride-on power trowel models, including J36, B46, CA, HDA, HTN, JTN, and PRO series equipment. As a direct OEM replacement, 20875 delivers the correct thread specification, head profile, and dimensional tolerancing required for a secure, flush-seating installation. This fastener is verified against Multiquip's original engineering drawings, making it a trustworthy choice when servicing trowel assemblies across multiple platforms. DHS Equipment stocks this part to help keep your concrete finishing equipment operating to spec.

Key Features

• Correct Thread Spec — 5/16-18 x 3/4: — Machined to the exact Unified Coarse thread standard and shank length specified for trowel assembly points, ensuring full thread engagement without over-torquing or stripping.
• Flat-Head Socket Cap Profile: — The FHSC (flat-head socket cap) design allows the fastener to sit fully flush or countersunk within the mating surface, maintaining clearance where rotating or close-tolerance components are nearby.
• Genuine OEM Sourcing: — Supplied as a Multiquip OEM part, this screw meets the same material grade and finish standards as the hardware installed at the factory, ensuring consistent clamping force and corrosion resistance across service life.
• Broad Trowel Family Coverage: — Compatible across J36, JA, B46, C, CA, HDA, HTN, JTN, PRO36, PRO46, and related international walk-behind and ride-on trowel series, reducing the number of individual fastener SKUs needed in a service inventory.
• Fastener Integrity Affects Trowel Assembly Safety: — A stripped, incorrect, or under-spec screw in a trowel guard, blade spider, or gearbox cover can allow components to shift under load. Using the correct OEM fastener maintains structural integrity at critical connection points.

A flat-head socket cap screw is a precision fastener used where a countersunk, flush-mount connection is required — common in trowel guard panels, blade pitch assemblies, housing covers, and drive system components. The 5/16-18 thread designation refers to a 5/16-inch diameter with 18 threads per inch (Unified Coarse), and the 3/4-inch length determines how deep the fastener engages the receiving material. Using an incorrectly sized or low-grade substitute can result in thread damage, inadequate clamping force, or fastener failure during operation — all of which compromise the structural integrity of the assembly. Replacing worn or damaged hardware with the correct OEM specification screw restores the connection to its original holding strength.

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.