The Wacker Neuson 5100011525 is a genuine OEM Cap Nut designed for the full range of RD-series tandem rollers, including the RD24-100, RD27-120, RD28-120, RD40-130, and RD45-140. Sourced directly from Wacker Neuson, this cap nut meets the exact specifications of the original hardware used at the factory. It fits across a wide range of RD-series configurations — including open-ROPS, canopy, DPF, and US-market variants — making 5100011525 the correct choice for most RD tandem roller service needs. Keep this part on hand for scheduled maintenance or fastener replacement to maintain the structural integrity of your machine.
Key Features
- Genuine OEM Hardware Grade — Manufactured to the precise thread form, torque rating, and material specification required for tandem roller applications, ensuring the fastener seats and retains correctly under machine vibration and load.
- Drop-In Replacement — Matches the original cap nut's thread pitch and dimensional profile, threading directly into the existing mount point without rework or additional hardware.
- Broad RD-Series Coverage — Verified fitment across RD24-100, RD27-120, RD28-120, RD40-130, and RD45-140 model families, including open-ROPS, canopy, DPF-equipped, and US-spec variants.
- Protects Fastener Threads and Mating Surfaces — The cap nut design shields exposed threads and bearing surfaces from contamination, moisture, and impact damage — critical in the demanding environment of asphalt and soil compaction work.
- Correct Part for Long-Term Retention — Using the properly rated OEM cap nut prevents fastener loosening under cyclical drum vibration, which can lead to component misalignment or hardware loss during operation.
A cap nut — also called an acorn nut — is a closed-end fastener that covers and protects exposed bolt threads while providing a secure, finished connection point on the machine. On tandem rollers like the RD series, hardware integrity is critical because continuous drum vibration creates constant cyclical stress on every fastener. A missing, stripped, or incorrect cap nut can allow moisture and debris to corrode the exposed thread stud, compromise the clamping load of the assembly it secures, and eventually lead to component loosening or failure during compaction operations.
Part Details
| Part Number | 5100011525 |
|---|---|
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Cap Nut |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| RD45-140 C Tandem Roller | RD45-140C US | 5100021804 |
| RD40-130o | RD40-130o | 5100047386 |
| RD24-100 C Tandem Roller | RD24-100C US | 5100021757 |
| RD24-100 O Tandem Roller | RD24-100 O | 5100011389 |
| RD45-140o DPF | RD45-140o DPF | 5100055782 |
| RD45-140o.3 | RD45-140o.3 | 5100047400 |
| RD40-130 Tandem Roller | RD40-130 US | 5100021801 |
| RD28-120 C Tandem Roller | RD28-120C US | 5100021758 |
| RD28-120o DPF | RD28-120o DPF | 5100047394 |
| RD24-100 Tandem Roller | RD24-100 | 5100011385, 5100047374 |
| RD45-140c.3 | RD45-140c.3 | 5100047398 |
| RD45-140.3 | RD45-140.3 | 5100047396 |
| RD27-120 C Tandem Roller | RD27-120 C | 5100011388 |
| RD24-100 O Tandem Roller | RD24-100O US | 5100021759 |
| RD45-140 Tandem Roller | RD45-140 US | 5100021802 |
| RD40-130 C Tandem Roller | RD40-130 C | 5100011393 |
| RD24-100c.3 | RD24-100c.3 | 5100047370 |
| RD40-130 Tandem Roller | RD40-130 | 5100011391, 5100047382 |
| RD40-130 O Tandem Roller | RD40-130O US | 5100021805 |
| RD40-130c.3 | RD40-130c.3 | 5100047397 |
| RD45-140 | RD45-140 | 5100047383, 5100011392 |
| RD28-120o | RD28-120o | 5100047379 |
| RD40-130c | RD40-130c | 5100047384 |
| RD40-130.3 | RD40-130.3 | 5100047395 |
| RD27-120o | RD27-120o.3 | 5100047373 |
| RD24-100c DPF | RD24-100c DPF | 5100047391 |
| RD28-120c DPF | RD28-120c DPF | 5100047392 |
| RD45-140c DPF | RD45-140c DPF | 5100055780 |
| RD45-140 O Tandem Roller | RD45-140 O | 5100011396 |
| RD40-130 O | RD40-130 O | 5100011395 |
| RD27-120 Tandem Roller | RD27-120 | 5100011386 |
| RD28-120 Tandem Roller | RD28-120 US | 5100021756 |
| RD24-100c | RD24-100c | 5100047376 |
| RD28-120 DPF | RD28-120 DPF | 5100047390 |
| RD45-140o | RD45-140o | 5100047387 |
| RD40-130c DPF | RD40-130c DPF | 5100055779 |
| RD40-130o DPF | RD40-130o DPF | 5100055781 |
| RD28-120 O Tandem Roller | RD28-120O US | 5100021800 |
| RD24-100o | RD24-100o | 5100047378 |
| RD 24-100.3 | RD 24-100.3 | 5100032197 |
| RD24-100 Tandem Roller | RD24-100 US | 5100021755 |
| RD24-100 C Tandem Rollers | RD24-100 C | 5100011387 |
| RD24-100 DPF | RD24-100 DPF | 5100047380 |
| RD27-120 | RD 27-120.3 | 5100032198 |
| RD27-120 O Tandem Roller | RD27-120 O | 5100011390 |
| RD28-120c | RD28-120c | 5100047377 |
| RD40-130 DPF | RD40-130 DPF | 5100055777 |
| RD40-130 C Tandem Roller | RD40-130C US | 5100021803 |
| RD27-120c | RD27-120c.3 | 5100047371 |
| RD24-100o DPF | RD24-100o DPF | 5100047393 |
| RD24-100o.3 | RD24-100o.3 | 5100047372 |
| RD45-140 O Tandem Roller | RD45-140O US | 5100021806 |
| RD28-120 | RD28-120 | 5100047375 |
| RD45-140 C Tandem Roller | RD45-140 C | 5100011394 |
| RD45-140c | RD45-140c | 5100047385 |
| RD40-130o.3 | RD40-130o.3 | 5100047399 |
| RD45-140 DPF | RD45-140 DPF | 5100055778 |
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.
