Mitsui Seiki HS6A
This model was not found in Mitsui Seiki's current lineup when we checked on 2026-10-03 . It may be a superseded or older model; the specifications below are as we last recorded them.
Key Specifications
X Travel
Y Travel
Z Travel
Spindle Taper
Tool Capacity
Rapid Traverse
How much does the Mitsui Seiki HS6A cost?
Estimated price range
Our best estimate for a horizontal machining centers (hmc) in this class — not a quote from Mitsui Seiki. Configuration moves it a long way.
Overview
The Mitsui Seiki HS6A is listed as a horizontal machining center for workpieces up to 1,000 mm (39.4 in) in diameter and 1,250 mm (49.2 in) high, with a No. 50 taper spindle producing 1,432 Nm (1,056 ft-lb) at low range. Mitsui Seiki's current lineup does not include it, so it may be an older model.
A caution before the figures. The table combines rows from more than one description of the machine, and they disagree on linear travels, pallet dimensions, standard spindle speed, motor power, magazine size, tool change time and whether the pallet changer is standard. None of those are quoted here. Take them from the machine's documentation, and treat any single value in the table with care.
Where the rows agree, they describe a heavy, rigid machine. The taper is No. 50, with CAT50, BT50 and HSK-A100 named. A 10,000 RPM spindle appears as the optional speed in both sets of rows. The torque figure of 1,432 Nm (1,056 ft-lb) is tied to the low range, which points to a spindle with more than one speed range, suited to large boring bars and face mills. Machine weight is 22,000 kg (48,500 lb) on a stress-relieved Meehanite cast iron base.
The precision rows are consistent as well: ±0.001 mm (±0.00004 in) positioning accuracy over full stroke, ±0.0005 mm (±0.00002 in) repeatability and 0.001° rotary table resolution, supported by spindle oil cooling, ballscrew cooling and ambient temperature compensation. Rapid traverse is 40 m/min (1,575 ipm) on all axes and a pallet change takes 18 sec. Compared with the HS5A at 18,000 kg (39,683 lb), this is the heavier machine.
Full Specifications
| Parameter | Value |
|---|---|
| Pallet Size | 630 mm (24.8 in) |
| X-Axis Travel | 900 mm (35.4 in) |
| Y-Axis Travel | 850 mm (33.5 in) |
| Z-Axis Travel | 950 mm (37.4 in) |
| Max Workpiece Diameter | 1,000 mm (39.4 in) |
| Max Workpiece Height | 1,250 mm (49.2 in) |
| Max Workpiece Weight | 4,400 |
| Spindle Taper | No. 50 (CAT50 / BT50 / HSK-A100) |
| Spindle Speed | 6,000 RPM (standard) / 10,000 RPM (optional) |
| Spindle Motor Power | 30 kW (40 hp) continuous / 37 kW (50 hp) 30-min |
| Spindle Torque | 1,432 Nm (1,056 ft-lb) at low range |
| Rapid Traverse Rate | 40 m/min (1,575 ipm) all axes |
| Feed Rate | 1–20,000 mm/min |
| Positioning Accuracy | ±0.001 mm (±0.00004 in) full stroke |
| Repeatability | ±0.0005 mm (±0.00002 in) |
| Rotary Table Resolution | 0.001° |
| Thermal Compensation | Spindle oil cooling, ballscrew cooling, ambient temperature compensation |
| Tool Capacity | 60 (standard) / 120 (optional magazine) |
| Tool Change Time | 3.5 sec (chip-to-chip) |
| Pallet Changer | 2-station APC (standard) |
| Pallet Change Time | 18 sec |
| Base Material | Meehanite cast iron, stress-relieved |
| CNC Control | FANUC 31i-B5 |
| Machine Weight | 22,000 kg (48,500 lb) |
| Machine Type | Machining Center |
| Num of Axes | 5 |
| Operation Type | CNC |
| CNC Brand | Fanuc 15M |
| Table Size L X W | 39.300(L) x 39.300(W) |
| Support Index Table | Standard |
| Support Rotary Table | Optional |
| Direction | Horizontal |
| Taper | # 50 |
| Top RPM | 4,500 |
| Top RPM Opt | 10,000 |
| Hp | 20.00 |
| Tool Carrier | ATC |
| Num Tools | 32 |
| Num Tools Opt | 270 |
| Tool Change Chip Time | 12.00 |
| Pallet Changer Available | Optional |
| Num Pallets | 2 |
| Num Pallets Opt | 10 |
| Num Axes | 5 |
| U Axis | None |
| X1 | 51.180" |
| Y1 | 47.240" |
| Z1 | 39.700" |
| A1 | 120.000° |
| B1 | 360.000° |
Specifications compiled from manufacturer literature and industry references. Not independently verified against a published spec sheet — confirm with the manufacturer or an authorised dealer before making a purchasing decision.
Strengths & Limitations
Strengths
- 1,432 Nm (1,056 ft-lb) of spindle torque at low range on a No. 50 taper
- Workpieces up to 1,000 mm (39.4 in) in diameter and 1,250 mm (49.2 in) high
- ±0.001 mm (±0.00004 in) positioning accuracy over full stroke and 0.001° rotary table resolution
- Spindle oil cooling, ballscrew cooling and ambient temperature compensation
- 40 m/min (1,575 ipm) rapid traverse on all axes
Limitations
- The listed figures disagree on travels, pallet size, power, tool capacity and tool change time, so none of those can be relied on without checking the machine
- The 10,000 RPM spindle is an option; the standard speed is one of the disputed rows
- 22,000 kg (48,500 lb) of machine weight calls for a foundation and heavy rigging
- The maximum workpiece weight row carries a number with no unit, so the load limit has to be confirmed
Best For
Frequently Asked Questions
01
Maximum workpiece diameter is listed at 1,000 mm (39.4 in) and maximum height at 1,250 mm (49.2 in). The weight row gives a number without a unit and the pallet-size rows disagree, so confirm the load limit and pallet dimensions on the machine.
02
The listed figure is 1,432 Nm (1,056 ft-lb) at low range, on a No. 50 taper named as CAT50, BT50 or HSK-A100. Spindle power appears with different values in different rows and is not quoted here. A 10,000 RPM spindle is listed as an option.
03
Positioning accuracy is listed at ±0.001 mm (±0.00004 in) over full stroke and repeatability at ±0.0005 mm (±0.00002 in). Rotary table resolution is 0.001°. Thermal measures listed are spindle oil cooling, ballscrew cooling and ambient temperature compensation.
04
The HS6A is the heavier machine: 22,000 kg (48,500 lb) against 18,000 kg (39,683 lb) for the HS5A. Both are listed with 40 m/min (1,575 ipm) rapid traverse on all axes and a No. 50 taper as standard. Pallet change takes 18 sec on the HS6A.
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