Multiquip 1875 Washer, Internal Shakeproof 3/8

The Multiquip 1875 is a genuine OEM Internal Shakeproof Washer 3/8 designed for a broad range of Multiquip and Whiteman equipment, including walk-behind and ride-on power trowels, plaster and mortar mixers, masonry saws, and fireproofing pumps. As a direct OEM replacement, part 1875 meets the original assembly specifications Multiquip engineers built into each machine. This washer fits an extensive lineup of models including BH11C, HTX6H, MD105, STX55Y6, HHN34TVD, EM12M, and many others across the J, B, CA, HTX, STX, HHN, HTN, JWN, MD, and LD series. Sourcing the correct fastening hardware keeps your equipment running safely and eliminates the guesswork of substituting non-spec hardware in the field.

Key Features

• Genuine OEM Construction — Manufactured to the same internal tooth profile and material grade Multiquip specifies for original assemblies, ensuring the washer bites and holds as intended under vibration and load.
• Internal Tooth Locking Design — The inward-facing serrations grip the fastener shank to resist loosening caused by the continuous vibration inherent in trowels, mixers, and pump equipment.
• Exceptionally Wide Fitment — A single part number covers walk-behind trowels (J, JA, B, BA, C, CA, HDA series), ride-on trowels (HTX, STX, HHN, HTN, JWN, MD, LD series), Essick and Whiteman mixers, masonry saws, and MG30 fireproofing pumps.
• Correct 3/8 Sizing — Matched to 3/8-inch fastener hardware used throughout these machine families, so the washer seats flush and delivers full clamping engagement without play or movement.
• Protects Fastener Joints Under Load — A worn or missing shakeproof washer allows bolted connections to work loose during operation, leading to misalignment, accelerated component wear, and unsafe machine behavior.

An internal shakeproof washer is a hardened locking washer with teeth that point inward toward the bolt or screw shank. When a fastener is tightened, the serrated teeth deform slightly against the shank and the mating surface, creating resistance that prevents the fastener from backing out due to vibration or cyclical loading. In construction equipment such as power trowels and mixers — machines that operate under sustained vibration — maintaining tight fastener connections is critical to structural integrity and safe operation. When this washer is absent, damaged, or substituted with a plain flat washer, bolted joints can progressively loosen, causing components to shift, wear prematurely, or fail unexpectedly during use.

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.