Okuma LB4000 EX III

Est. $165,000 - $260,000 Specs verified 2026-10-03 · okuma.com Updated 2026-10-03

Image: d30jruhmdicmo0.cloudfront.net, Okuma

Key Specifications

Rapid Traverse

30/30 m/min (1,181/1,181 ipm)

Spindle Power

30/22 [37/30] kW (40/30 [50/40] hp)

Max Turn Length

750 mm (29.53 in)

max turning diameter

480 mm (18.90 in)

spindle nose

JIS A2-8 [JIS A2-11, JIS A2-15]

chuck size

12 in (305 mm) / 15 in (381 mm)

How much does the Okuma LB4000 EX III cost?

Estimated price range

Est.$165,000 - $260,000

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 Okuma LB4000 EX III is a 480 mm (18.90 in) by 750 mm (29.53 in) turning center whose 12-station turret uses BMT mounting, with 280 mm (11 in) of X-axis travel. Rapids are 30/30 m/min (1,181/1,181 ipm), the same rate for both figures on the row, which is quick for a lathe that accepts a 15 in (381 mm) chuck.

Okuma builds the spindle three ways. The standard version is 30/22 kW (40/30 hp) on a JIS A2-8 nose with a 42–4,200 rpm range. In brackets, as options, the table shows 37/30 kW (50/40 hp), JIS A2-11 and JIS A2-15 noses, and speed ranges of 30–3,000 and 12–1,400 rpm. Top speed drops as the nose grows, so choose by the stock: the A2-8 spindle for general chuck and bar work at up to 4,200 rpm, the larger noses when bore size or chuck mass matters more than rpm. The chuck is 12 in (305 mm) or 15 in (381 mm).

Compared with the LB35III, the LB4000 EX III turns 480 mm against 460 mm (18.11 in) and moves faster between cuts, 30/30 m/min against 15 / 20 m/min. The LB35III answers with length: 600 mm standard and up to 2,000 mm optional, where this model's table lists 750 mm only.

Full Specifications

Parameter	Value
Max Turning Diameter	480 mm (18.90 in)
Max Turning Length	750 mm (29.53 in)
Spindle Motor Power	30/22 [37/30] kW (40/30 [50/40] hp)
Spindle Nose	JIS A2-8 [JIS A2-11, JIS A2-15]
Chuck Size	12 in (305 mm) / 15 in (381 mm)
Turret Stations	12 (BMT mounting)
X Axis Travel	280 mm (11 in)
Rapid Traverse Rate	30/30 m/min (1,181/1,181 ipm)
Spindle Speed	42–4,200 [30–3,000, 12–1,400] rpm

Specifications sourced from okuma.com — verified 2026-10-03

Strengths & Limitations

Strengths

30/30 m/min (1,181/1,181 ipm) rapid traverse
12-station turret with BMT mounting
Standard 30/22 kW (40/30 hp) spindle, with 37/30 kW (50/40 hp) as an option
JIS A2-8 nose as standard, JIS A2-11 and JIS A2-15 optional

Limitations

One turning length is listed, 750 mm (29.53 in); the LB35III offers up to 2,000 mm as an option
The optional spindles give up speed for size: 3,000 or 1,400 rpm maximum instead of 4,200 rpm
Okuma's headline rows give no bar capacity or machine weight for this model

Best For

Chuck work up to 480 mm (18.90 in) in a 12 in (305 mm) or 15 in (381 mm) chuck Shafts up to 750 mm (29.53 in) long Short-cycle work that gains from 30/30 m/min rapids Heavy turning on the optional 37/30 kW (50/40 hp) spindle

Frequently Asked Questions

01 What spindle options does the LB4000 EX III have?

Standard is 30/22 kW (40/30 hp), JIS A2-8, 42–4,200 rpm. The options in Okuma's table are 37/30 kW (50/40 hp), JIS A2-11 or JIS A2-15 noses, and speed ranges of 30–3,000 and 12–1,400 rpm.

02 What is the work envelope of the LB4000 EX III?

Maximum turning diameter is 480 mm (18.90 in) and maximum turning length is 750 mm (29.53 in). X-axis travel is 280 mm (11 in). The chuck is 12 in (305 mm) or 15 in (381 mm).

03 How does the LB4000 EX III differ from the LB3000 EX III?

The LB3000 EX III is the smaller machine, listed with a 22 kW (30 hp) spindle and rapids of 25 m/min in X and 30 m/min in Z. The LB4000 EX III starts at 30/22 kW (40/30 hp) on a JIS A2-8 nose and runs 30/30 m/min rapids.