HNK HGG-550
Key Specifications
gear outside diameter
module range
helix angle
vertical working range
grinding wheel diameter
grinding wheel thickness
How much does the HNK HGG-550 cost?
Price estimate
We do not have a price for the HNK HGG-550 that we can stand behind, so we show no number. Configuration, options and installation move the final price a long way: a quote is the reliable figure.
Overview
Between car gears and industrial gears sits the HNK HGG-550. HNK files this CNC gear grinding machine under automobile parts, and its range runs to gears of Ø550 mm (21.7 in) outside diameter in modules M0.8-M10: truck and bus transmission gears, axle ring gears, and the larger wheels in construction-machine drivelines.
The vertical working range is 300 mm (11.8 in). A grinding wheel of up to 300 mm (11.8 in) diameter and 145 mm (5.7 in) thickness runs at 5,000 rpm. Helix angle range is ±45°. Spindle drive power is 12 kW (16.1 hp), with 36 kW (48.3 hp) in braces, which is a wide gap between the two figures; the higher one is the figure to ask about for module 10 work.
There is a clear space above this model in HNK's range. The next gear grinder, the HGG-1000, starts a different family with a 400 mm (15.7 in) wheel and modules M1-M35. The control is Siemens 840D.
Full Specifications
| Parameter | Value |
|---|---|
| Gear Outside Diameter | Ø550 mm (21.7 in) |
| Module Range | M0.8-M10 |
| Helix Angle | ±45° |
| Vertical Working Range | 300 mm (11.8 in) |
| Grinding Wheel Diameter | Max. 300 mm (11.8 in) |
| Grinding Wheel Thickness | 145 mm (5.7 in) |
| Grinding Spindle Power | 12 kW (16.1 hp) {36 kW (48.3 hp)} |
| Wheel Speed Max | 5,000 rpm |
| CNC Control | Siemens 840D |
Specifications sourced from en.hnkkorea.com — verified 2026-10-04
Strengths & Limitations
Strengths
- Modules M0.8-M10 on gears up to Ø550 mm (21.7 in)
- 5,000 rpm wheel speed with a wheel up to 145 mm (5.7 in) thick
- 300 mm (11.8 in) vertical working range
Limitations
- Base spindle power of 12 kW (16.1 hp); 36 kW (48.3 hp) appears only in braces
- Wheel speed of 5,000 rpm is below the 5,500 rpm of the HGG-260
- Loading, dressing and cycle data are not published
Best For
Frequently Asked Questions
01
Gear outside diameter up to Ø550 mm (21.7 in), modules M0.8-M10, helix angle ±45° and a vertical working range of 300 mm (11.8 in). The grinding wheel is up to 300 mm (11.8 in) in diameter.
02
The table prints 12 kW (16.1 hp) followed by 36 kW (48.3 hp) in braces and gives no legend. On HNK's HGH hobbing table for automobile parts, a braced power is labelled as an option, so the larger figure is probably an optional drive.
03
The HGG-1000, for gears up to Ø1,000 mm (39.4 in) in modules M1-M35, with a 650 mm (25.6 in) vertical working range and a 24 kW (32.2 hp) grinding spindle.
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