The Wacker Neuson Lock Washer is a genuine OEM component designed for the HSH and Pureheat hydronic surface heater series, including the HSH700, HSH650, HX200, E2200, and Pureheat hydronic heater models. As a direct OEM part, the is sourced from Wacker Neuson and built to the exact specification of the original hardware used during manufacture. This lock washer is a common fastener-retention component across multiple hydronic heating platforms, making it a practical stocking item for service technicians and fleet maintenance teams working across these product families.
Key Features
- Genuine OEM Retention Integrity — Manufactured to Wacker Neuson's original specification, ensuring the correct bite, hardness, and spring tension needed to prevent fastener loosening under thermal cycling and vibration.
- Drop-In Hardware Replacement — Matches the original bore diameter, outer profile, and thickness for a direct swap with no rework or custom fitting at the fastener point.
- Broad Hydronic Heater Compatibility — Confirmed fitment across the HSH700, HSH650, HX200 Heat Exchanger, E2200 Ground Heater, and Pureheat hydronic heater models (oil burner and gas burner variants).
- Thermal and Vibration Resistance — Lock washers in hydronic heating equipment are exposed to repeated heat-cool cycles; using the correct hardness grade prevents premature flattening and fastener backing-out over time.
- Critical in Fluid-System Assemblies — Fastener security in hydronic systems directly affects plumbing joint integrity; a failed or omitted lock washer can allow connections to loosen and lead to fluid leaks or pressure loss.
A lock washer is a hardened, split or toothed ring placed under a fastener to resist loosening caused by vibration, thermal expansion, and contraction. In hydronic surface heaters like the HSH and Pureheat series, internal components are subject to repeated heating cycles that cause materials to expand and contract — conditions that gradually work standard fasteners loose. The lock washer bites into both the fastener face and the mating surface, creating mechanical resistance that maintains clamping force over the service life of the assembly. When a lock washer is worn flat, missing, or substituted with an incorrect grade, fasteners in critical plumbing and panel assemblies can back out, compromising both performance and safety of the heating system.
Part Details
| Part Number | 5000167921 |
|---|---|
| Old Part Number | 0167921 |
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Lock Washer |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| HSH700 | HSH700G | 5000620243 |
| HX200 Heat Exchanger | HX200 | 5000620430 |
| E2200 GROUND HEATER, W/ LIFT BAIL | E2200 | 5000620215 |
| Pureheat Hydronic Heater, Oil Burner | Pureheat | 5000620245, 5000620246, 5000620190 |
| HSH650 | HSH650 | 5000620991 |
| Hydronic Surface Heater, 700m hose | E700M | 5000620195 |
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.
