Bomag Cotter Pin | Part 09170404

The Bomag 09170404 Cotter Pin is a genuine OEM fastening component designed for a wide range of Bomag tandem rollers, single drum rollers, walk-behind rollers, vibratory plates, cold milling machines, recyclers/stabilizers, trench compactors, and pavers. Sourced directly from Bomag, this cotter pin matches the exact material and dimensional specification of the original, ensuring a drop-in fit without guesswork. This part is confirmed compatible across an extensive lineup, including BW 120 AD, BW 213 D, BW 100 AD-5, BW 120 AD-5, BW 131 AD-5, BM 1000/35, BM 2500/75, MPH 600, RS 500, BMP 8500, and many additional models. When a worn or missing cotter pin is the cause of a loose or unsecured assembly, replacing it with part number 09170404 restores the intended mechanical lock quickly and correctly.

Key Features

• Genuine OEM Construction — manufactured to Bomag's exact material grade and dimensional tolerances, so this cotter pin delivers the same positive locking action as the original hardware
• Direct-Fit Replacement — seats into the same pin bore and spreads identically to the part it replaces, requiring no modifications to the surrounding assembly
• Broad Fitment Coverage — fits Bomag tandem rollers, single drum rollers, walk-behind rollers, cold milling machines, recyclers/stabilizers, trench compactors, vibratory plates, and pavers, including BW 120 AD, BW 213 D, BM 1000/35, MPH 600, RS 500, BMP 8500, CR1030T, and many more models
• Mechanical Security — a correctly installed cotter pin prevents pins, bolts, and clevises from backing out under vibration and load, keeping critical linkages and fastened assemblies in place during operation
• Safety-Critical Hardware — cotter pins are a last line of retention for moving and structural fasteners; using the correct OEM-spec part helps ensure the securing joint performs as the machine was designed to require

A cotter pin is a small but essential split-pin fastener inserted through a drilled hole in a bolt, shaft, or clevis pin, then bent open at both legs to lock the assembly in place. Its purpose is to prevent rotation or withdrawal of the primary fastener under vibration — a common challenge on compaction and milling equipment that operates under constant dynamic load. When a cotter pin shears, fatigues, or goes missing, the fastener it secures can work loose, leading to play in linkages, loss of component alignment, or unexpected detachment of assemblies during operation.

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.

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