Titan part 870-021 is a half nut, 3/4-10 used in the fluid section or mechanical linkage of compatible Commander and Hydra airless sprayers. This half nut (also called a split nut) is typically used in a lead screw or adjustment mechanism, allowing quick engagement or disengagement. A worn, stripped, or damaged half nut can cause slipping, loss of adjustment, or failure to hold position. Replacing with the OEM half nut restores proper thread engagement and reliable operation.
| Part Number | 870-021 |
|---|---|
| Part Description | Half Nut, 3/4-10 |
| Brand | Titan |
| Fits |
|
| Condition | New |
The Titan 870-021 Half Nut, 3/4-10 is a genuine OEM replacement half nut (split nut) used in the fluid section or adjustment mechanism of Commander and Hydra series airless sprayers. It features a 3/4-10 thread and is designed to engage with a lead screw for precise positioning or clamping.
Over time, half nuts can wear from repeated adjustment, strip from over‑tightening, or become corroded. A damaged half nut causes slipping under load, inability to hold a set position, or difficulty engaging/disengaging the mechanism. Replacing with OEM Titan 870-021 restores proper thread fit and reliable operation.
| Engages lead screw | Allows quick adjustment or clamping action |
|---|---|
| Holds position | Prevents movement under vibration or load |
| Quick release | Enables rapid disengagement for repositioning |
| Load transfer | Transmits force from screw to moving part |
| Slips under load | Half nut does not hold position when tightened |
|---|---|
| Stripped or worn threads | Threads are flattened or missing |
| Corrosion / rust | Heavy rust that prevents smooth engagement |
| Visible cracking | Half nut body cracked or deformed |
Titan part 870-021 is a direct OEM replacement half nut for the following models. Always verify with your machine's parts diagram.
| Model | Component |
|---|---|
| Commander (741-440) | Half nut, 3/4-10 |
| Commander (761-301) | Half nut, 3/4-10 |
| Commander (761-411) | Half nut, 3/4-10 |
| Commander (741-331) | Half nut, 3/4-10 |
| Hydra M | Half nut, 3/4-10 |
| Hydra Pro Super | Half nut, 3/4-10 |
When replacing the half nut, inspect these associated components.
Worn screw threads will damage a new half nut; replace if worn.
Check for bent linkage or worn pivot pins.
Replace corroded bolts or clips that secure the half nut.
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