Hermle B 300 U

Est. $280,000 - $420,000 Updated 2026-10-03

Key Specifications

X Travel

650 mm (25.6 in)

Y Travel

560 mm (22.0 in)

Z Travel

470 mm (18.5 in)

Max Spindle

15,000 rpm (18,000 or 20,000 rpm optional)

Spindle Taper

HSK-A63

Tool Capacity

36 tools (68 with optional extension)

How much does the Hermle B 300 U cost?

Estimated price range

Est.$280,000 - $420,000

Our best estimate for a 5-axis machining center in this class — not a quote from Hermle. Configuration moves it a long way.

Overview

The Hermle B 300 U is a compact 5-axis machining centre with 650 × 560 × 470 mm (25.6 × 22.0 × 18.5 in) of travel and a Ø 600 mm (23.6 in) table that tilts on an A-axis and rotates through 360° continuously on C. The listed figures put the largest workpiece at Ø 600 x 300 mm (23.6 x 11.8 in) and the table load at 300 kg (661 lb), so the machine suits medium-sized parts that are wide rather than tall.

The A-axis range is listed as -130° / +20°. That is asymmetric: the table swings well past the vertical to one side and only a little to the other, which covers five-sided work and undercuts but means a feature can be approached from one tilt direction only. Check that against the way your fixtures present the part.

The spindle is an HSK-A63 unit listed at 15,000 rpm with 17 kW (23 hp) continuous and 100 Nm (74 ft-lb), and 18,000 or 20,000 rpm versions are optional. Those ratings point to finishing and moderate roughing rather than heavy stock removal. The magazine holds 36 tools, or 68 with the optional extension, the listed chip-to-chip time is 5 sec, and rapids are 35 m/min (1,378 ipm).

Listed accuracy is ±0.005 mm (±0.0002 in) for positioning and ±0.003 mm (±0.0001 in) for repeatability, with ±5 arc seconds on the rotary axes. The machine weighs 8,500 kg (18,739 lb) and occupies 2,800 x 3,600 mm (110.2 x 141.7 in). The control row names the Heidenhain TNC7 for GEN2 machines and the Heidenhain TNC 640 for earlier ones, so confirm which control a particular machine carries.

Full Specifications

Parameter	Value
X-Axis Travel	650 mm (25.6 in)
Y-Axis Travel	560 mm (22.0 in)
Z-Axis Travel	470 mm (18.5 in)
A Axis Range	-130° / +20°
C Axis Range	360° continuous
Table Diameter	Ø 600 mm (23.6 in)
Max Workpiece Size	Ø 600 x 300 mm (23.6 x 11.8 in)
Max Table Load	300 kg (661 lb)
Max Spindle Speed	15,000 rpm (18,000 or 20,000 rpm optional)
Spindle Taper	HSK-A63
Spindle Motor Power	17 kW (23 hp) continuous
Spindle Torque	100 Nm (74 ft-lb)
Tool Capacity	36 tools (68 with optional extension)
Tool Change Time	5 sec chip-to-chip
Rapid Traverse Rate	35 m/min (1,378 ipm)
Rotary Axis Accuracy	±5 arc seconds
Positioning Accuracy	±0.005 mm (±0.0002 in)
Repeatability	±0.003 mm (±0.0001 in)
CNC Control	Heidenhain TNC7 (GEN2); Heidenhain TNC 640 (earlier models)
Machine Weight	8,500 kg (18,739 lb)
Floor Space Required	2,800 x 3,600 mm (110.2 x 141.7 in)

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

650 × 560 × 470 mm (25.6 × 22.0 × 18.5 in) of travel and a Ø 600 mm (23.6 in) table on a 2,800 x 3,600 mm (110.2 x 141.7 in) footprint
The C-axis rotates 360° continuously and the A-axis is listed at -130° / +20°, enough for five-sided and undercut work in one clamping
HSK-A63 spindle at 15,000 rpm, with 18,000 or 20,000 rpm listed as options
36 tools in the magazine, or 68 with the optional extension
Listed positioning accuracy of ±0.005 mm (±0.0002 in) and repeatability of ±0.003 mm (±0.0001 in)

Limitations

Table load is 300 kg (661 lb), and fixture, vise and part together have to stay under it
Workpiece height is limited to 300 mm (11.8 in) on the Ø 600 mm (23.6 in) table
17 kW (23 hp) continuous and 100 Nm (74 ft-lb) is a lighter spindle than the C 250, which is listed with 20 kW and 173 Nm at 15,000 / 16,000 rpm
The A-axis reaches only +20° on one side, so a part cannot be tilted equally in both directions
The 68-tool capacity and the 18,000 or 20,000 rpm spindles are options, not part of the base machine

Best For

5-axis parts up to Ø 600 x 300 mm (23.6 x 11.8 in) and 300 kg (661 lb) Five-sided machining of housings, plates and tooling components in one clamping Finishing and moderate roughing with HSK-A63 tooling at 15,000 rpm Shops with limited floor area: the footprint is 2,800 x 3,600 mm (110.2 x 141.7 in)

Frequently Asked Questions

01 What size of workpiece does the Hermle B 300 U take?

The listed maximum is Ø 600 x 300 mm (23.6 x 11.8 in) on a Ø 600 mm (23.6 in) table, with a table load of 300 kg (661 lb). Travels are 650 mm (25.6 in) in X, 560 mm (22.0 in) in Y and 470 mm (18.5 in) in Z. The 300 kg limit includes the fixture, so weigh the workholding before committing a heavy part.

02 What spindle does the B 300 U have?

The listed spindle is HSK-A63 at 15,000 rpm with 17 kW (23 hp) continuous and 100 Nm (74 ft-lb) of torque. Versions at 18,000 or 20,000 rpm are optional. On a machine already built, the spindle fitted depends on what was ordered, so confirm it from the machine's own data.

03 How far do the rotary axes of the B 300 U move?

The A-axis range is listed as -130° / +20° and the C-axis as 360° continuous, with ±5 arc seconds given for rotary axis accuracy. Because the A range is not symmetric, the table tilts much further in one direction than the other, which affects how a fixture has to be oriented for undercut features.

04 How does the B 300 U compare with the C 250?

The B 300 U is listed with 650, 560 and 470 mm of travel against 600 mm, 550 mm and 450 mm on the C 250. The C 250 has the stronger spindle, 20 kW and 173 Nm at 15,000 / 16,000 rpm at 20% c.d.f., where the B 300 U shows 17 kW (23 hp) continuous and 100 Nm (74 ft-lb). The C 250 starts with 30 pockets and the B 300 U with 36 tools.