Citizen Miyano BNX-51MSY
This model was not found in Citizen Machinery's current lineup when we checked on 2026-10-02 (lineup page). It may be a superseded or older model; the specifications below are as we last recorded them.
Image: cmj.citizen.co.jp, Citizen Machinery
Key Specifications
Rapid Traverse
Spindle Power
max bar capacity sp1
max bar capacity sp2
max machining length
main spindle speed
How much does the Citizen Miyano BNX-51MSY cost?
Estimated price range
Our best estimate for a mill-turn / multi-tasking machine in this class — not a quote from Citizen Machinery. Configuration moves it a long way.
Overview
The Citizen Miyano BNX-51MSY is a two-spindle fixed-headstock lathe for short bar parts: 51 mm (2.0 in) bar through the main spindle, 42 mm (1.65 in) on the back spindle, and a maximum machining length of 100 mm (3.94 in). Both spindles run to 5,000 rpm. Citizen no longer has the model in its current lineup, so the machines on offer are used ones.
The difference between the two spindles shapes what can be made. The main spindle bore is 52 mm and the back spindle bore 43 mm, with a 6" thru-hole chuck on one and a 5" thru-hole chuck on the other. A part whose back end is turned larger than 42 mm where the back spindle grips it cannot be handed over, so check the transfer diameter of every part family before buying.
Twelve live tool stations run at 6,000 rpm on a 4.0 kW (25 Nm) motor, and the Y axis gives 80 mm (+/-40 mm) of travel for cross holes, flats and off-centre drilling. Turning tools are □20 mm and sleeves φ25 mm. The spindle end faces are 892 mm apart.
On the shop floor the BNX-51MSY weighs 11,687 lb (5,300 kg), covers 2,630 × 1,540 mm (104 × 60.6 in), stands 1,775mm high and needs 33 KVA / 100 A. Coolant capacity is 300 L and the control is the Mitsubishi M830W. Axis strokes, rapid rates and motor ratings are not given consistently in the table on this page, so take those from the machine's own documentation.
Full Specifications
| Parameter | Value |
|---|---|
| Max Bar Capacity Sp1 | 51 mm (2.0 in) |
| Max Bar Capacity Sp2 | 42 mm (1.65 in) |
| Max Machining Length | 100 mm (3.94 in) |
| Main Spindle Speed | 5,000 RPM |
| Sub Spindle Speed | 5,000 RPM |
| Sub Spindle Power | 11/7.5 kW (15/10 hp) |
| Turret Stations | 12 Station / 8 Station |
| Live Tool Stations | 12 |
| Live Tool Speed | 6,000 RPM |
| Live Tool Power | 4.0 kW (25 Nm) |
| Travel X1 | 168 mm (6.61 in) |
| Travel Z1 | 349 mm (13.74 in) |
| Travel X2 | 88 mm (3.46 in) |
| Travel Z2 | 650 mm (25.59 in) |
| Y Axis Travel | 80 mm (+/-40 mm) |
| Rapid Traverse Xz | 24 m/min (945 ipm) |
| Rapid Traverse Y | 10 m/min (394 ipm) |
| Machine Weight | 11,687 lb (5,300 kg) |
| Floor Space | 2,630 x 1,540 mm |
| Power Consumption | 33 KVA / 100 A |
| CNC Control | Mitsubishi M830W |
| Items | BNX-51MSY2 |
| Distance Between Spindle End Faces | 892 mm |
| Motor for Spindle | SP1 Cs |
| Sp2 Cs | 1 / 7.5 kW (15 min / cont.) |
| Type of Tool Slide | 12st |
| Tool | □20 mm |
| Sleeve | φ25 mm |
| Z1 Axis | 349 mm |
| Z2 Axis | 650 mm |
| Y1 Axis | ±40 mm |
| X2 Axis | 88 mm |
| Revolving Tool Capacity | Max. 12 |
| Machine Height | 1,775mm |
| Standard Machining Diametersp1 Sp2 | ø65 mm/ø65 mm |
| Power Chuck Typesp1 Sp2 | 6” hollow chuck |
| Distance Between Spindle End Facessp1 Cs | 18.5 / 15 kW (15 min / cont.) |
| Distance Between Spindle End Facessp2 Cs | 1 / 7.5 kW (15 min / cont.) |
| Max Spindle Speedsp1 Sp2 | 5,000 min-1 |
| Slide Strokex1 Axis | 168 mm |
| Slide Strokez1 Axis | 349 mm |
| Slide Strokez2 Axis | 650 mm |
| Slide Strokey1 Axis | ±40 mm |
| Slide Strokex2 Axis | 88 mm |
| Bar Capacity | 51 mm / 42 mm Dia. |
| Chuck Size | 6" Thru-hole / 5" Thru-hole |
| Spindle Bore | 52 mm / 43 mm Dia. |
| Rapid Traverse Rate | 20 m/min |
| Turret Stroke | 165 mm / 246 mm / 80 (±40) mm |
| Sub Spindle Stroke | 85 mm / 590 mm |
| Spindle Motor Power | 15/11 kW / 7.5/5.5 kW |
| Coolant Capacity | 300 L |
| Floor Space Required | 2,630 × 1,540 mm (104 × 60.6 in) |
Specifications sourced from marucit.com — verified 2026-09-24
Strengths & Limitations
Strengths
- 51 mm (2.0 in) main-spindle bar capacity through a 52 mm bore and a 6" thru-hole chuck
- 12 live tool stations driven at 6,000 rpm by a 4.0 kW (25 Nm) motor
- 80 mm (+/-40 mm) of Y travel for cross holes and off-centre drilling
- Both spindles run to 5,000 rpm, so back-end work is not held to a lower speed
- 300 L coolant capacity and a Mitsubishi M830W control
Limitations
- The back spindle takes 42 mm (1.65 in), so parts gripped above that diameter cannot be transferred
- Maximum machining length is 100 mm (3.94 in), which rules out longer shafts
- Not in Citizen's current lineup; inspect the control, spindles and turret on any used machine
- Strokes, rapids and motor ratings are not stated consistently in the table; confirm them from the machine's documentation
Best For
Frequently Asked Questions
01
The main spindle takes 51 mm (2.0 in) bar through a 52 mm bore and a 6" thru-hole chuck. The back spindle takes 42 mm (1.65 in) through a 43 mm bore and a 5" thru-hole chuck. Both run to 5,000 rpm.
02
The maximum machining length is 100 mm (3.94 in), so this is a short-part machine. The distance between the spindle end faces is 892 mm, which is the room the back spindle has to approach and pick off the part.
03
12 live tool stations running at up to 6,000 rpm on a 4.0 kW (25 Nm) motor, with 80 mm (+/-40 mm) of Y travel. Turning tools are □20 mm and boring sleeves φ25 mm.
04
Plan for 11,687 lb (5,300 kg), a footprint of 2,630 × 1,540 mm (104 × 60.6 in), 1,775mm of height and a 33 KVA / 100 A supply. The coolant tank holds 300 L.
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