Okuma LB4000 EX II

Est. $175,000 - $275,000 Updated 2026-10-03

Key Specifications

Rapid Traverse

25/30 m/min (984/1181 ipm)

Spindle Power

30/22 kW (40/30 hp)

Max Turn Length

2,150 mm (84.65 in)

max turning diameter

480 mm (18.90 in)

spindle nose

JIS A2-8

spindle torque

High torque via PREX motor (configuration dependent)

How much does the Okuma LB4000 EX II cost?

Estimated price range

Est.$175,000 - $275,000

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

Overview

The listed figures for the Okuma LB4000 EX II describe a long-bed turning center: 480 mm (18.90 in) of maximum turning diameter with a maximum turning length of 2,150 mm (84.65 in). The spindle is 30/22 kW (40/30 hp) on a JIS A2-8 nose, running 42–4,200 rpm. The table credits its torque to a PREX motor and calls it configuration dependent, without giving a number.

Much of this table is conditional on the build. Weight is listed as 6,500 - 9,000 kg (14,330 - 19,842 lb) depending on bed length. A programmable hydraulic tailstock is standard on longer bed models. Chuck size is given as up to 18.5 in (470 mm), bar capacity as up to 190 mm (7.5 in) with the Super Big Bore option, and the control as the Okuma OSP-P300L or OSP-P500L. For any one machine, each of those has to be pinned down from its build sheet, and the bar capacity in particular applies only where that bore option was ordered.

The turret is a 12-station bolt-on type, with VDI or BMT listed as options. Rapid traverse is 25 m/min (984 ipm) in X and 30 m/min (1,181 ipm) in Z. Thermo-Friendly Concept, described as active thermal compensation, is listed for thermal management.

The LB4000 EX III is listed with the same 480 mm (18.90 in) diameter and a 750 mm (29.53 in) turning length, with rapids of 30/30 m/min (1,181/1,181 ipm).

Full Specifications

Parameter	Value
Max Turning Diameter	480 mm (18.90 in)
Max Turning Length	2,150 mm (84.65 in)
Spindle Nose	JIS A2-8
Spindle Motor Power	30/22 kW (40/30 hp)
Spindle Torque	High torque via PREX motor (configuration dependent)
Bar Capacity	Up to 190 mm (7.5 in) with Super Big Bore option
Chuck Size	Up to 18.5 in (470 mm)
Rapid Traverse X	25 m/min (984 ipm)
Rapid Traverse Z	30 m/min (1,181 ipm)
Turret Type	12-station bolt-on (VDI or BMT options available)
Tailstock	Programmable hydraulic tailstock (standard on longer bed models)
Machine Weight	6,500 - 9,000 kg (14,330 - 19,842 lb) depending on bed length
CNC Control	Okuma OSP-P300L / OSP-P500L
Thermal Management	Thermo-Friendly Concept (active thermal compensation)
Spindle Speed	42–4,200 rpm
Rapid Traverse Rate	25/30 m/min (984/1181 ipm)

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

Listed maximum turning length of 2,150 mm (84.65 in) on a 480 mm (18.90 in) turning diameter
30/22 kW (40/30 hp) spindle on a JIS A2-8 nose, 42–4,200 rpm
Programmable hydraulic tailstock, standard on longer bed models
12-station bolt-on turret with VDI or BMT options
Thermo-Friendly Concept thermal compensation is listed

Limitations

No torque figure is listed; the table says only that torque depends on configuration
The 190 mm (7.5 in) bar capacity needs the Super Big Bore option
Weight runs from 6,500 to 9,000 kg (14,330 - 19,842 lb) depending on bed length, so rigging has to be planned per machine
Top spindle speed is 4,200 rpm

Best For

Long shafts supported by the hydraulic tailstock Chuck work up to 480 mm (18.90 in) in diameter Large bar and tube on machines with the Super Big Bore option Steel turning with the 30/22 kW (40/30 hp) spindle

Frequently Asked Questions

01 What are the turning capacities of the LB4000 EX II?

The listed figures are 480 mm (18.90 in) of maximum turning diameter and 2,150 mm (84.65 in) of maximum turning length. Chuck size is given as up to 18.5 in (470 mm). Bed length varies between machines, so confirm the length of the one on offer.

02 What spindle does the LB4000 EX II have?

A 30/22 kW (40/30 hp) spindle on a JIS A2-8 nose with a 42–4,200 rpm range. The table attributes its torque to a PREX motor but gives no torque figure, so ask for the torque curve of the configuration in question.

03 Which control does the LB4000 EX II use?

The table lists the Okuma OSP-P300L or the OSP-P500L. Which of the two a machine has depends on how it was built, so read it from the machine itself. Thermo-Friendly Concept thermal compensation is listed as well.

04 Does the LB4000 EX II come with a tailstock?

A programmable hydraulic tailstock is listed as standard on longer bed models. The table does not say what the shorter machines carry. Machine weight is 6,500 - 9,000 kg (14,330 - 19,842 lb) depending on bed length.