The Wacker Neuson 5100012235 is a genuine OEM Cap Nut designed for the RD series tandem rollers, spanning the RD18, RD24, RD27, RD28, RD40, and RD45 model families. As a direct OEM replacement, this cap nut is manufactured to the exact tolerances and thread specifications required by Wacker Neuson for these machines. Fitment covers an extensive range of configurations across the RD series, including smooth drum, combination, open ROPS, DPF-equipped, and.3-generation variants. Confirm your machine's model number against the fitment list before ordering to ensure a correct match.
Key Features
- Genuine OEM Thread Integrity — Manufactured to Wacker Neuson's exact thread pitch and dimensional spec, ensuring the cap nut seats and torques correctly without risk of cross-threading or stripping.
- Drop-In Installation — Replaces the original cap nut directly; no reworking of the mating fastener or housing required.
- Broad RD Series Coverage — Compatible with RD18, RD24, RD27, RD28, RD40, and RD45 tandem rollers across smooth drum, combination drum, open ROPS, DPF, and .3-generation configurations.
- Protects the Fastener Below — A correctly fitted cap nut shields the underlying bolt or stud from contamination, corrosion, and impact damage, preserving thread condition for future service intervals.
- Sourced from Wacker Neuson — Part number 5100012235 is an authentic Wacker Neuson component, giving you full confidence in material grade and dimensional accuracy.
A cap nut — also known as an acorn nut — is a closed-end fastener that threads onto a bolt or stud, covering and protecting the exposed thread end. On Wacker Neuson RD series tandem rollers, cap nuts are used in locations where the bolt tip must be shielded from moisture, debris, and mechanical damage to prevent corrosion and maintain long-term clamping integrity. When a cap nut becomes damaged, stripped, or corroded, it can compromise the fastener joint it protects, making timely replacement with a correctly specified part essential to maintaining the structural reliability of the assembly.
Part Details
| Part Number | 5100012235 |
|---|---|
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Cap Nut |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| RD18-80 | RD18-80 | 5100047360, 5100011382, 5100055774 |
| Vibration Roller | RD18-100c 3 | 5100047363 |
| 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 |
| RD18-100 C Tandem Roller | RD18-100 C | 5100011384 |
| 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 |
| RD24-100c.3 | RD24-100c.3 | 5100047370 |
| RD40-130 C Tandem Roller | RD40-130 C | 5100011393 |
| 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 |
| RD18-100c.3 | RD18-100c.3 | 5100055948 |
| RD28-120o | RD28-120o | 5100047379 |
| RD40-130c | RD40-130c | 5100047384 |
| RD40-130.3 | RD40-130.3 | 5100047395 |
| RD18-100 C Tandem Roller | RD18-100 C US | 5100027574 |
| 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 |
| RD18-100 Tandem Roller | RD18-100 | 5100011383, 5100047361, 5100055775 |
| RD18-100c | RD18-100c | 5100055776, 5100047362 |
| RD40-130 O | RD40-130 O | 5100011395 |
| RD18-100 Tandem Roller | RD18-100 US | 5100027573 |
| 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 |
| RD18 | RD18-100.3 | 5100055947 |
| 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 |
| Vibration Roller | RD18-100 SE | 5100044989 |
| 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 |
| Vibration Roller | RD18-80 SE | 5100044988 |
| 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 |
| RD18-80.3 | RD18-80.3 | 5100055946 |
| RD18-80 Tandem Roller | RD18-80 US | 5100027572 |
| 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.
