Multiquip 10235 Lock Washer 5/16 Ext. Tooth Countersink

The Multiquip 10235 Lock Washer 5/16 Ext. Tooth Countersink is a genuine OEM fastener component designed for Whiteman and International walk-behind and ride-on power trowel series including HDA, J, B, CA, BS, JS, BH, HTN, and JTO series machines. As a direct OEM replacement, part 10235 is manufactured to the same specifications as the original hardware installed at the factory, ensuring consistent clamping performance and secure fastening across all applicable trowel assemblies. Fitment covers a wide range of Multiquip power trowel configurations, including HDA-Series, J36-M30, B46, CA4HM, HTNS5S-2, JTNSW20, JTNSW24HTCSL, and more. Sourced directly through DHS Equipment as an authorized Multiquip parts distributor, you can trust that part number 10235 is the correct, verified component for your machine.

Key Features

• External Tooth Countersink Design — The external serrated teeth bite into the mating surface under torque load, resisting loosening from vibration — critical on trowel assemblies that cycle continuously during finishing operations.
• Genuine OEM Hardware Grade — Manufactured to the same material hardness and dimensional tolerance as the original fastener, maintaining consistent clamping force across the full service life of the fastener joint.
• Drop-In Replacement for 5/16 Fastener Positions — Sized and profiled to seat correctly in 5/16 bolt applications on Multiquip power trowel assemblies without any rework or modification to the surrounding hardware.
• Broad Trowel Series Coverage — Fits a wide range of Whiteman and International walk-behind and ride-on power trowel models including HDA-Series, J, B, CA, BS, JS, BH, HTN, JTO, and JTNS series machines.
• Prevents Joint Loosening Under Load — A worn or missing lock washer allows fasteners to back out during operation, leading to component misalignment or failure; replacing it promptly maintains structural integrity of the assembly.

A lock washer is a hardened fastener component placed beneath a nut or bolt head to prevent the fastener from loosening under vibration and dynamic loads. The external tooth countersink profile of the Multiquip 10235 provides 360-degree gripping action against the bearing surface, distributing clamping load evenly while resisting rotational loosening. On power trowel equipment — which operates under sustained vibration during concrete finishing — maintaining tight, secure fastener joints is essential to keeping mechanical assemblies aligned and operating correctly. A missing or fatigued lock washer can allow fasteners to gradually back out, compromising the integrity of critical connections and leading to accelerated wear or component separation.

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.