Multiquip 1391 HHC Screw 5/16-24 x 1-1/2 Zinc

The Multiquip 1391 is a genuine OEM HHC Screw 5/16-24 x 1-1/2 Zinc designed for Whiteman and international walk-behind power trowel series including the B46, J36, BH90C, BS46, JH90C, CA4HM, HDA, JA, BA, and PRO series models. As a factory-authorized replacement, part 1391 meets the original assembly specification for thread pitch, zinc coating, and head geometry — exactly as the machine was built. Verify your model against the fitment list to confirm compatibility before ordering.

Key Features

• Correct Thread Form and Finish: — 5/16-24 fine-thread pitch with zinc plating matches the original fastener spec, ensuring proper torque retention in the trowel assembly.
• Genuine OEM Part: — Sourced directly from Multiquip, this screw is identical to the hardware installed at the factory — no guesswork on fitment or dimensions.
• Broad Trowel Series Coverage: — Fits a wide range of Whiteman and international walk-behind power trowels including B46, J36, BH90C, JH90C, BS46, PRO36, PRO46, HDA-Series, BA-Series, CA4HM, and more.
• Structural Integrity Where It Counts: — A correctly torqued, properly threaded fastener keeps guards, housings, and drive components secured during trowel operation; a worn or mismatched screw can allow component shift and uneven blade contact.
• Zinc Coating for Corrosion Resistance: — The zinc finish resists surface oxidation in wet concrete environments, helping the fastener hold its thread engagement over repeated service intervals.

A hex head cap (HHC) screw is a standard structural fastener used throughout walk-behind trowel assemblies to secure housings, guards, gear cases, and blade pitch components. The 5/16-24 designation indicates a fine-thread profile, which provides stronger thread engagement and better resistance to loosening under vibration compared to coarse-thread alternatives — an important characteristic given the continuous vibration trowels generate during finishing passes. When this type of fastener fails — whether through thread stripping, corrosion, or shear — it can allow critical components to shift or separate, directly affecting blade pitch consistency and operator safety. Replacing with the correct OEM-specified part ensures the assembly returns to its original clamping load and thread engagement.

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.