HN426 Standard Model — Heavy Duty Hydraulic Oil Press
The HN426 occupies a specific niche in our lineup: it's the cold-press specialist for hard-shell nuts that smaller models struggle with. At 500 tons of force and 42 Mpa cake surface pressure, this machine can take whole walnut kernels (in-shell for most varieties), apricot kernels, yellowhorn (Xanthoceras sorbifolium), and tiger nuts (Cyperus esculentus) — and extract them clean in a single press cycle.
What makes 42 Mpa different from 30 Mpa? When you're pressing something like a walnut or an apricot kernel, the shell structure resists deformation. Lower-pressure machines either can't crack it efficiently or leave significant oil trapped inside the cake. The HN426's 320mm piston — substantially wider than the HN355's 280mm — distributes that force across a larger area while maintaining the pressure needed to fully collapse even dense nut matrices.
A practical detail worth knowing: each batch takes roughly 30 minutes at full pressure for hard nuts (shorter for softer seeds). That's not fast by sesame standards, but cold-pressing walnuts isn't about speed — it's about preserving the heat-sensitive compounds that command premium prices in cosmetic and specialty food markets. The West African tiger nut milk trend is driving new demand for this exact capability right now, and the HN426 was designed for precisely this kind of application.
- 500 tons — built for hard-shell nuts and cold-press applications
- 42 Mpa/cm² cake pressure — cracks walnut shells, extracts fully
- 320mm piston diameter — largest in mid-range series
- ~30 minutes per batch on hard nuts (shorter for soft seeds)
- Nickel-plated barrel standard (included, not optional)
- Cold-press: walnuts (in-shell), apricots, tiger nuts, yellowhorn
- Dual-barrel design for continuous operation
Full Specifications
| Parameter | Single Barrel | Double Barrel |
|---|---|---|
| System Pressure | 70 Mpa | 70 Mpa |
| Pressing Force | 500 Tons | 500 Tons |
| Motor Power | 2.2 KW | 2.2 KW |
| Machine Weight | 2.4 Tons | 2.7 Tons |
| Cylinder Outer Diameter | 426 mm | 426 mm |
| Piston Diameter | 320 mm | 320 mm |
| Barrel Inner Diameter | 390 mm (standard) | 390 mm (standard) |
| Barrel Height | 800 mm | 800 mm |
| Cylinder Stroke | 850 mm | 850 mm |
| Overall Dimensions | 1200×1200×2750 mm | 2100×1200×2750 mm |
| Cake Surface Pressure | 42 Mpa/cm² | |
Nickel-plated barrel comes standard on HN426 and above. All specifications customizable.
Cold-Press Specialty
The HN426 is specifically recommended for customers who need to cold-press harder nut materials that smaller models cannot handle efficiently:
Walnuts (In-Shell)
Full cold press in one cycle. No pre-shelling required for most varieties except iron walnuts. ~30 minutes per batch.
Apricot Kernels
High-value cold-pressed apricot kernel oil for cosmetics and food markets. Clean single-cycle extraction.
Tiger Nuts
Growing demand in West African markets. The 42 Mpa pressure extracts thoroughly in one pass.
Frequently Asked Questions — HN426
Can the HN426 cold-press walnuts without shelling them first?
For most common walnut varieties, yes — the 42 Mpa pressure is sufficient to crack the shell and extract oil in one cycle. The exception is iron walnuts (extremely hard-shell varieties found in parts of China and Central Asia), which may need pre-cracking or a second press pass. If you're unsure about your specific variety, send us photos or a sample description and we'll confirm.
Why does each batch take ~30 minutes? Can I speed it up?
Cold pressing is inherently slower than hot pressing because you're relying on mechanical force alone — no heat to thin the oil. The 30-minute figure includes loading, full-pressure hold time (where most extraction happens), and decompression. Shortening the hold time leaves more oil in the cake. For cold-pressed walnut oil that sells at $15–30/L, patience pays.
Is HN426 suitable for tiger nut milk production?
Absolutely — this is actually one of our fastest-growing use cases in West Africa (Nigeria, Ghana). Tiger nuts (Cyperus esculentus) are fibrous and resist lower-pressure machines. The HN426's 500-ton force extracts thoroughly in one pass, producing tiger nut oil that can be processed into milk or sold directly as a specialty culinary oil. We've shipped several units to Lagos and Accra specifically for this application.
What's the difference between using HN426 vs HN500 for walnuts?
For most walnut operations, the HN426 is sufficient — 42 Mpa handles standard varieties cleanly. The HN500's 52 Mpa is overkill unless you're processing iron walnuts at industrial volume or running multiple shifts where machine longevity matters. The HN500 also costs significantly more and weighs an extra 1.1 tons. Start with HN426 unless you have a specific reason to go bigger.
Does cold-pressing apricot kernels require any special setup?
Apricot kernels don't need roasting before cold pressing — in fact, keeping them raw preserves the vitamin E and delicate aroma compounds that make apricot kernel oil valuable in cosmetics. Make sure your kernels are properly dried (moisture below 8%) before loading; damp kernels compress into a gummy cake that traps oil and can stick to the barrel wall. A pre-drying step or sun-drying rack is worth setting up if your supply chain delivers fresh kernels.