The Bomag 05740857 O-Ring is a genuine OEM sealing component designed for Bomag BW 100 AD-4, BW 100 AC-4, BW 120 AD-4, BW 120 AC-4, BW 125 AD-4, and BW 125 AC-4 tandem rollers. Sourced directly from Bomag, this O-Ring matches the original material grade, cross-section, and diameter specifications of the part it replaces. This component installs without modification, restoring a proper fluid-tight seal in the system it serves. Keeping the correct O-Ring in service is essential to preventing fluid loss and maintaining full operating pressure across these tandem roller models.
Key Features
- OEM-Grade Sealing Material — manufactured to Bomag's original compound and durometer specifications, ensuring correct compression and long-lasting seal integrity under the operating temperatures and pressures of tandem roller hydraulic and fluid systems.
- Drop-In Replacement — matched to the exact cross-section and inner diameter of the original, so this O-Ring seats correctly in its groove on the first installation attempt.
- Broad Tandem Roller Coverage — fits BW 100 AD-4, BW 100 AC-4, BW 120 AD-4, BW 120 AC-4, BW 125 AD-4, and BW 125 AC-4 tandem rollers, consolidating a single part number across the full BW 100–125 AC/AD-4 range.
- Leak Prevention — a correctly seated O-Ring maintains fluid containment and system pressure; a worn or pinched O-Ring can cause seepage, pressure loss, and accelerated wear on surrounding components.
- Genuine Bomag OEM Part — supplied as an authentic Bomag component under part number 05740857, giving you confidence in traceability and fitment accuracy.
An O-Ring is a precision loop of elastomeric material that creates a fluid-tight seal between two mating surfaces or within a fitting, valve, or hydraulic connection. In tandem rollers like the BW 100, BW 120, and BW 125 series, O-Rings appear throughout hydraulic circuits, fluid reservoirs, and mechanical assemblies wherever a leak-free junction is required. When an O-Ring degrades — through heat cycling, chemical exposure, or physical wear — it loses its ability to maintain compression, allowing fluid to escape and contaminants to enter, which can lead to pressure loss and damage to adjacent components.
Part Details
| Part Number | 05740857 |
|---|---|
| Brand | Bomag |
| Part Type | Genuine OEM |
| Description | O-Ring |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| Tandem Roller | BW 100 AD-4 | 00817685 |
| Tandem Roller | BW 100 AC-4 | 00817687 |
| Tandem Roller | BW 120 AD-4 | 00817689, 00818377 |
| Tandem Roller | BW 120 AC-4 | 00817691 |
| Tandem Roller | BW 125 AD-4 | 00817937 |
| Tandem Roller | BW 125 AC-4 | 00818271 |
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.
