Citizen Machinery CNC Lathes / Turning Centers

Citizen Miyano BNJ-42S

Est. $200,000 - $280,000 Possible older model Updated 2026-10-03

This model was not found in Citizen Machinery's current lineup when we checked on 2026-10-03 (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 It may be a superseded or older model; the specifications below are as we last recorded them.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

max bar capacity sp1

42 mm (1.65 in)

max bar capacity sp2

42 mm (1.65 in)

max machining length

100 mm (3.94 in)

main spindle speed

60 - 6,000 RPM

main spindle power

15/11 kW (20/15 hp)

sub spindle speed

50 - 5,000 RPM

How much does the Citizen Miyano BNJ-42S cost?

Estimated price range

Est.$200,000 - $280,000

Our best estimate for a cnc lathes / turning center in this class — not a quote from Citizen Machinery. Configuration moves it a long way.

Overview

The Citizen Miyano BNJ-42S is a compact two-spindle, two-turret bar lathe for 42 mm (1.65 in) stock on both spindles, with a main spindle listed at 60 - 6,000 RPM and a sub spindle at 50 - 5,000 RPM. Citizen's current lineup no longer shows it as a separate model, so this page mainly serves buyers looking at an existing machine; check the figures on the machine itself.

The layout is unusual for its size. The sub spindle rides on its own slide, with 85 mm (3.35 in) of X2 and a long 590 mm (23.23 in) of Z2, so it can come forward to pick off the part and then work against the lower turret. The upper turret has 12 stations and the lower 8, with live tools at 6,000 RPM on the upper and 3,000 RPM on the lower. The upper turret moves 165 mm (6.50 in) in X1 and 246 mm (9.69 in) in Z1.

Because both spindles take the same 42 mm (1.65 in) bar, the sub spindle can grip the part on its full diameter after cut-off, and the listed maximum machining length is 100 mm (3.94 in). Collet chucks listed are H-S20 / DIN173E on the main spindle and H-S16 / DIN171E on the sub spindle.

The main spindle motor is listed at 15/11 kW (20/15 hp) and the sub at 7.5/5.5 kW (10/7.5 hp), which leaves real power for back-end turning rather than only finishing. The control is a Mitsubishi M80W dual-path. With 5,300 kg on a 2,840×1,560mm footprint (without chip conveyor) and 1,700 mm of height, it is a much lighter machine than the 7,600 kg Miyano BNE-42S6.

Full Specifications

Parameter	Value
Max Bar Capacity Sp1	42 mm (1.65 in)
Max Bar Capacity Sp2	42 mm (1.65 in)
Max Machining Length	100 mm (3.94 in)
Main Spindle Speed	60 - 6,000 RPM
Main Spindle Power	15/11 kW (20/15 hp)
Sub Spindle Speed	50 - 5,000 RPM
Sub Spindle Power	7.5/5.5 kW (10/7.5 hp)
Upper Turret Stations	12
Lower Turret Stations	8
Upper Turret Live Tool Speed	6,000 RPM
Lower Turret Live Tool Speed	3,000 RPM
Travel X1	165 mm (6.50 in)
Travel Z1	246 mm (9.69 in)
Travel X2	85 mm (3.35 in)
Travel Z2	590 mm (23.23 in)
Power Chuck Sp1	H-S20 / DIN173E
Power Chuck Sp2	H-S16 / DIN171E
Machine Weight	5,300 kg
Floor Space	2,840×1,560mm(Without Chip Conveyor)
Machine Height	1,700 mm
CNC Control	Mitsubishi M80W dual-path
Items	BNJ-42S6
Spindle	Spindle Speed Range
Sp2	JPN, H-S16, DIN171E
Hd2	M10×1.0
Revolving Tools	Maximum Number of Revolving Tools
Spindle Speed Range	HD1
Maximum Drilling Diameter	HD1
Maximum Tapping Diameter	HD1
Slide Stroke	Turret Slide Stroke
Z1 Axis	246mm
Z2 Axis	590mm
Motors	Spindle Motor
Sp2 Cs	7.5/5.5kw(15min./Cont.)
Standard Turning Length Sp1 Sp2	100mm
Standard Machining Diameter Sp1 Sp2	51mm Dia./42mm Dia.
Spindle Speed Range Sp1	50 - 5,000min-1
Spindle Speed Range Sp2	50 - 5,000min-1
Type of Collet Chuck Sp1	H-S22, DIN177E
Type of Collet Chuck Sp2	JPN, H-S16, DIN171E
Type of Power Chuck Sp1 Sp2	6"/5" Hollow
Type of Turret Hd1	12st.
Type of Turret Hd2	8st.
Maximum Number of Revolving Tools Hd1	Max.12
Maximum Number of Revolving Tools Hd2	Max.4
Spindle Speed Range Hd1	6,000min-1
Maximum Drilling Diameterhd1	13mm Dia.
Maximum Drilling Diameterhd2	10mm Dia.
Maximum Tapping Diameter Hd1	M12×1.75
Maximum Tapping Diameter Hd2	M10×1.0
Turret Slide Stroke X1 Axis	165mm
Turret Slide Stroke Z1 Axis	246mm
Spindle Slide Stroke X2 Axis	85mm
Spindle Slide Stroke Z2 Axis	590mm
Spindle Motor Sp1 Cs	15/11kw(15min./Cont.)
Spindle Motor Sp2 Cs	7.5/5.5kw(15min./Cont.)
Spindle Speed Range Hd2	3,000min-1
Maximum Drilling Diameter Hd1	13mm Dia.
Turret Slide Stroke Y Axis	±40mm
Maximum Drilling Diameter Hd2	10mm Dia.

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

Main and sub spindles both take 42 mm (1.65 in) bar
Sub spindle on its own slide with 590 mm (23.23 in) of Z2 travel
Sub spindle motor listed at 7.5/5.5 kW (10/7.5 hp), enough for real back-end turning
12-station upper and 8-station lower turret on a Mitsubishi M80W dual-path control
Compact at 5,300 kg and 2,840×1,560mm without chip conveyor

Limitations

Not shown as a separate model in Citizen's current lineup
Lower-turret live tools are listed at 3,000 RPM, half the upper turret's 6,000 RPM
Maximum machining length is 100 mm (3.94 in)
X2 stroke is only 85 mm (3.35 in)

Best For

Short bar parts up to 42 mm (1.65 in) turned on both ends Back-end turning that needs a full-size grip on the sub spindle Compact cells where floor space is tight Buyers assessing a used BNJ-42S

Frequently Asked Questions

01 Is the Miyano BNJ-42S still made?

It does not appear as a separate model in Citizen's current lineup. The BNJ page now shows the Miyano BNJ-51SY6, which takes 51 mm dia. on SP1 and 42 mm dia. on SP2. Confirm the configuration of any BNJ-42S on the machine itself.

02 How does the sub spindle move on the BNJ-42S?

The sub spindle sits on its own slide, with 85 mm (3.35 in) of X2 and 590 mm (23.23 in) of Z2 travel. It runs 50 - 5,000 RPM on a 7.5/5.5 kW (10/7.5 hp) motor and holds H-S16 / DIN171E collets.

03 How many tools do the turrets hold?

The upper turret has 12 stations, with live tools at 6,000 RPM, and the lower turret 8 stations, with live tools at 3,000 RPM. The upper turret travels 165 mm (6.50 in) in X1 and 246 mm (9.69 in) in Z1.

04 What control does the BNJ-42S use?

A Mitsubishi M80W dual-path control, so the upper turret and the sub spindle with the lower turret can be programmed as two paths and cut at the same time.