Multiquip 4001 Flat USS Washer 3/8 Plated

The Multiquip 4001 Flat USS Washer 3/8 Plated is a genuine OEM hardware component used across a broad range of Multiquip, Whiteman, and Essick equipment. This plated 3/8-inch USS flat washer is specified across ride-on trowel models including HHN31V, HHN34TVD, HTN28K, and HTN27K, as well as Whiteman mortar mixers WM120SH and WM120PH, Essick mixers EM120SM and EM120S and EM120P series, water trailers, trash pumps, screeds, welders, saws, and vibrator assemblies. Because this single part number appears on so many equipment bills of materials, keeping 4001 in your service stock is a practical call for any shop or fleet operator running Multiquip-family machines. Sourcing directly from DHS Equipment ensures you receive the correct genuine OEM part every time.

Key Features

• Genuine OEM Specification: — Manufactured to Multiquip's exact plating and dimensional tolerances, ensuring correct load distribution and corrosion resistance in the applications where this washer is called out.
• 3/8-Inch USS Standard Sizing: — Conforms to USS flat washer dimensions for 3/8-inch fasteners, seating correctly against mating hardware without shimming or modification.
• Wide Cross-Equipment Compatibility: — A single part number covering ride-on trowels (HHN, HTN, JWN series), Whiteman and Essick mixers, water trailers, trash pumps, screeds, welders, and plate vibrators makes this an efficient stock item.
• Protective Plating for Durability: — The zinc plating guards against rust and surface corrosion, maintaining clamp load integrity over repeated service cycles in wet or outdoor working conditions.
• Consistent Fastener Performance: — A correctly sized and properly plated flat washer distributes bolt or nut bearing load evenly, preventing fastener pull-through, surface damage, and loosening under vibration.

A flat washer serves as a load-spreading interface between a fastener — a bolt head or nut — and the surface it bears against. By distributing clamping force over a wider area, it prevents the fastener from pulling through or deforming softer materials and reduces the risk of loosening caused by vibration. The USS designation refers to the United States Standard washer series, which specifies a larger outer diameter relative to bolt size than SAE washers, making it the correct choice where broader load distribution is needed. On equipment that operates under continuous vibration — such as trowels, compaction machinery, and screeds — maintaining the correct washer specification is essential to keeping fastened assemblies secure through extended service.

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.