INDEX-Traub CNC Lathes / Turning Centers

INDEX B400

Est. $400,000 - $600,000 Specs verified 2026-10-03 · index-group.com Updated 2026-10-03

Image: index-group.com, INDEX-Traub

Key Specifications

Max Spindle

4,000 rpm

Spindle Power

16 / 24 kW (100%/40% duty)

Max Turn Length

750 mm (29.5 in)

max turning diameter

200 mm (7.9 in)

max workpiece length

400 mm (15.7 in)

turning spindle speed

4,000 RPM

How much does the INDEX B400 cost?

Estimated price range

Est.$400,000 - $600,000

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

Overview

The INDEX B400 is a high-torque production turning machine with a 315 mm (12.4 in) chuck, 82 mm (3.2 in) bar capacity and a 4,000 rpm main spindle rated 375 Nm continuous and 550 Nm at 40% duty. Torque is what separates it from the other INDEX turning centers of similar weight: the G200 and R200 give 125 / 170 Nm and 135 / 190 Nm, so the B400 has roughly three times their continuous torque for heavy roughing at low speed.

Power is more modest, at 16 kW continuous and 24 kW at 40% duty. That combination of high torque and moderate power fits large-diameter work and tough materials at low spindle speed, where the cut is torque-limited, more than fast stock removal on small diameters.

The counter spindle is a working spindle in its own right. It takes 65 mm (2.6 in) bar, runs to 4,000 rpm and is rated 8 kW continuous and 12 kW at 40% duty, with 79 Nm continuous and 119 Nm at 40% duty. Second-side operations can therefore include real turning, not only parting and drilling.

The table gives a maximum turning diameter of 200 mm (7.9 in) and a maximum turning length of 750 mm (29.5 in), but also lists a maximum workpiece length of 400 mm (15.7 in) and pairs the 200 mm diameter with the 315 mm chuck. Ask INDEX which limits apply to your part and setup before quoting work near either figure. The control is a Siemens S840D sl.

The machine weighs 7,800 kg (17,196 lb), occupies 3,251 × 1,900 × 2,290 mm (L × W × H) and needs a 40 kW supply. The table lists no figures for driven tools, Y-axis or turret stations, so milling capability has to be confirmed separately.

Full Specifications

Parameter	Value
Max Turning Diameter	200 mm (7.9 in)
Max Workpiece Length	400 mm (15.7 in)
Turning Spindle Speed	4,000 RPM
CNC Control	Siemens S840D sl
Machine Weight	7,800 kg (17,196 lb)
Max Turning Length	750 mm (29.5 in)
Max Bar Capacity	82 mm (3.2 in)
Chuck Size	315 mm (12.4 in)
Max Spindle Speed	4,000 rpm
Spindle Motor Power	16 / 24 kW (100%/40% duty)
Spindle Torque	375 / 550 Nm (100%/40% duty)
Sub Spindle Bar Capacity	65 mm (2.6 in)
Sub Spindle Speed	4,000 rpm
Sub Spindle Torque	79 / 119 Nm (100%/40% duty)
Sub Spindle Power	8 / 12 kW (100%/40% duty)
Floor Space Required	3,251 × 1,900 × 2,290 mm (L × W × H)
Power Supply	40 kW

Specifications sourced from index-group.com — verified 2026-10-03

Strengths & Limitations

Strengths

375 Nm continuous and 550 Nm at 40% duty on the main spindle, far above the 125 / 170 Nm of the G200
82 mm (3.2 in) bar capacity and a 315 mm (12.4 in) chuck
Counter spindle takes 65 mm (2.6 in) bar and is rated 8 / 12 kW and 79 / 119 Nm (100%/40% duty)
Compact 3,251 × 1,900 mm floor area for a 7,800 kg (17,196 lb) machine
Counter spindle runs to the same 4,000 rpm as the main spindle, so both ends of the part can be cut at matching speeds

Limitations

Main spindle tops out at 4,000 rpm, slow for small diameters and non-ferrous work
Main drive power is 16 kW continuous and 24 kW at 40% duty, so the torque is not matched by high power
The table gives no driven-tool, Y-axis or turret figures, so milling capability is unconfirmed
Workpiece length is listed as 400 mm (15.7 in) against a 750 mm (29.5 in) turning length; the usable limit needs confirming

Best For

Heavy roughing of steel bar up to 82 mm (3.2 in) Chucked parts that need high torque at low speed Parts with substantial turning on the second side Production cells with a 40 kW supply and limited floor area

Frequently Asked Questions

01 How much torque does the B400 main spindle deliver?

375 Nm continuous and 550 Nm at 40% duty, from a drive rated 16 kW continuous and 24 kW at 40% duty. Top speed is 4,000 rpm. The torque figure is about three times the 125 Nm continuous of the G200, which makes the B400 the stronger choice for large-diameter roughing.

02 What is the bar capacity of the B400?

82 mm (3.2 in) on the main spindle and 65 mm (2.6 in) on the counter spindle. The main spindle also takes a 315 mm (12.4 in) chuck, so the machine can run bar work or chucked blanks.

03 What can the B400 counter spindle do?

It runs to 4,000 rpm, the same as the main spindle, and is rated 8 kW continuous and 12 kW at 40% duty with 79 Nm continuous and 119 Nm at 40% duty. That is enough for genuine turning on the back of the part, not only parting off and facing.

04 How long a part can the B400 machine?

The table gives a maximum turning length of 750 mm (29.5 in) and a maximum workpiece length of 400 mm (15.7 in). The two rows describe different limits, so confirm with INDEX which applies to chucked and bar-fed parts in your setup.

05 What floor space and power does the B400 need?

The machine measures 3,251 × 1,900 × 2,290 mm (L × W × H), weighs 7,800 kg (17,196 lb) and has a 40 kW connected load. Check floor loading and the bar loader footprint, which the table does not include.