The Wacker Neuson Lock Nut is a genuine OEM component designed for the HI750 and HI900 series indirect-fired air heaters, as well as the HP252. Sourced directly from Wacker Neuson, this lock nut is manufactured to the exact dimensions and material specifications required for these machines. It fits across a wide range of HI750 and HI900 configurations, including diesel, natural gas, LP, and DGM variants, covering both standard and skid-mounted units. When you need a confirmed OEM match for your indirect heater, the is the correct part.
Key Features
- Genuine OEM Thread Integrity — Manufactured to exact torque and thread-engagement specifications, ensuring the nut seats and locks correctly without risk of cross-threading or under-torque loosening.
- Direct-Fit Replacement — Matches the original fastener profile so it installs in the same position and orientation as the factory part with no rework needed.
- Broad HI-Series Compatibility — Confirmed fitment across HI750 and HI900 indirect-fired air heater families in diesel, natural gas, LP, DGM, and surge-brake configurations, plus the HP252.
- Maintains Secure Clamping Force — A properly torqued lock nut prevents critical assemblies from vibrating loose during heater operation — a failed or missing lock nut can allow components to shift and create unsafe conditions.
- Fuel-System and Structural Safety — In indirect-fired heater applications, fastener integrity is directly tied to the safety of fuel connections and heat exchanger assemblies; using the correct OEM nut supports proper equipment operation.
A lock nut is a fastener engineered to resist loosening under vibration and thermal cycling — two conditions that are constant during indirect air heater operation. Unlike a standard nut, it incorporates a locking feature (such as a nylon insert, distorted thread, or prevailing-torque profile) that maintains clamping force even as components expand and contract with temperature changes. When a lock nut fails or is substituted with an incorrect fastener, the joint it secures can work loose over time, potentially allowing movement in fuel, exhaust, or heat exchanger connections where reliable retention is critical to safe operation.
Part Details
| Part Number | 5000172592 |
|---|---|
| Old Part Number | 0172592 |
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Lock Nut |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| HP252 | HP252 | 5000620249 |
| HI750 DGM HEATER-INDIRECT | HI750GM | 5000620859, 5000620930 |
| Mobile Indirect Fired Air Heat er, Diesel | HI750D | 5000620856, 5000620923, 5000620924 |
| HI 750GM HD-Mobile Indirect Ai r Heater-Surge, -40 | HI750GMHD | 5000620969 |
| HI750G HEATER-INDIRECT | HI750G | 5000620857, 5000620928, 5000620929 |
| HI900 Heater-DGM,Srg,-40 | HI900DGM | 5200014221, 5200014222, 5200014165, 5200014166 |
| HI 900D Heater-Indirect | HI900D | 5200014158, 5200014159, 5200014160 |
| Skid Indirect Air Heaters Natu ral Gas | HI900G | 5200014161 |
| HI 900G Heater-Indirect,3x16 | HI900 G | 5200014163, 5200014164 |
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.
