Mazak QT-COMPACT 300

$80,000 - $120,000 Updated 2026-03-16

Key Specifications

Max Spindle

4,500 RPM

Spindle Power

15 kW (20 hp)

max swing

380 mm (15.0 in)

max machining length

510 mm (20.1 in)

bar capacity

65 mm (2.56 in)

chuck size

8 in (A2-6 spindle nose)

Overview

The Mazak QT-COMPACT 300 is the largest member of Mazak's QT-COMPACT series, a line of slant-bed CNC lathes designed for efficient bar and chuck work in a small machine footprint. The QT-COMPACT 300 increases bar capacity and chuck size relative to the smaller 200 and 250 models while maintaining the compact external dimensions that make the COMPACT series attractive to shops with space constraints or those building multi-machine cells.

The machine features a 65 mm (2.56 in) bar capacity through an A2-6 spindle with 8-inch chuck, a maximum swing of 380 mm (15.0 in), and a maximum machining length of 510 mm (20.1 in). The spindle runs to 4,500 RPM with 15 kW (20 hp), suitable for both turning and thread cutting operations across a wide range of materials from aluminum and brass to medium-carbon steel and stainless. The 10-station turret accommodates OD and ID tooling in a combination arrangement.

The slant-bed construction provides natural chip clearance and maintains structural rigidity across the full speed and feed range. Mazak built the QT-COMPACT series for shops that need reliable production turning capacity without the floor space demands of full-size turning centers. The QT-COMPACT 300 footprint is typically under 2 m x 1.5 m, making it suitable for installation alongside other machines or in rows for cellular manufacturing.

The machine runs on MAZATROL SmoothG control with conversational programming, lowering the programming burden for turning-focused shops. Pricing for new QT-COMPACT 300 machines runs $80,000 to $120,000. The machine competes with the Haas ST-20, the DMG Mori CLX 350, and Doosan Puma 2600 in the compact production lathe segment.

Full Specifications

Parameter	Value
Max Swing	380 mm (15.0 in)
Max Machining Length	510 mm (20.1 in)
Bar Capacity	65 mm (2.56 in)
Chuck Size	8 in (A2-6 spindle nose)
Max Spindle Speed	4,500 RPM
Spindle Motor Power	15 kW (20 hp)
Spindle Torque	240 Nm (177 ft-lb)
Turret Stations	10 stations
Rapid Traverse X	20 m/min (787 ipm)
Rapid Traverse Z	24 m/min (945 ipm)
Tailstock	CNC-controlled programmable tailstock
Machine Weight	3,500 kg (7,716 lb)
Floor Space	1,900 x 1,500 mm (74.8 x 59.1 in)
CNC Control	MAZATROL SmoothG CNC

Specifications sourced from mazak.com — verified 2026-03-28

Strengths & Limitations

Strengths

Compact footprint under 2 m x 1.5 m enables installation in tight spaces and side-by-side cellular manufacturing configurations that larger turning centers cannot achieve
65 mm bar capacity covers the majority of bar turning work in precision manufacturing, medical, aerospace subcontracting, and general job shop applications
MAZATROL SmoothG conversational control allows experienced turning machinists to program directly at the machine without extensive G-code programming knowledge
Slant-bed design provides natural chip clearance and structural rigidity at an accessible entry price point for the Mazak CNC lathe lineup

Limitations

510 mm maximum machining length limits shaft and long-part capability; shops regularly machining parts over 400 mm long should consider larger turning centers
15 kW (20 hp) spindle is modest for heavy roughing in stainless steel or interrupted cutting; cycle times on tough materials will be slower than on higher-power machines
10-station turret limits tooling variety for complex parts requiring many different tool profiles; shops with highly complex turned parts need larger-turret machines

Best For

Production shops running high volumes of small-to-medium turned parts from bar stock where floor space efficiency is a priority Medical device manufacturers turning small orthopedic and surgical components from bar stock in stainless steel, titanium, and cobalt chrome Aerospace subcontractors machining fasteners, inserts, fittings, and small structural turned parts from bar stock up to 65 mm Job shops adding compact production turning capacity alongside VMCs and other equipment in multi-machine manufacturing cells

Frequently Asked Questions

01 What is the difference between the QT-COMPACT 300 and the QT-COMPACT 300M?

The QT-COMPACT 300M adds driven tooling capability to the turret, enabling milling, drilling, and cross-drilling operations in addition to turning. The standard QT-COMPACT 300 is a pure turning machine with static tooling only. If your parts require off-center holes, flats, slots, or cross-drilled features, the 300M eliminates a secondary operation on a mill or VMC.

02 Can the QT-COMPACT 300 be paired with a bar feeder?

Yes. The QT-COMPACT 300 is designed to interface with standard short and long bar feeders for continuous bar production. Mazak offers compatible bar feeder integration, and most third-party bar feeder manufacturers support QT-COMPACT configurations. Bar feeder integration enables extended unattended production for repetitive bar parts, significantly improving throughput in production environments.

03 How does the MAZATROL SmoothG control compare to older MAZATROL controls?

SmoothG is the current-generation MAZATROL control for standard turning and milling machines. It replaces the older Matrix control with a larger touchscreen interface, improved conversational programming flow, faster processing speeds, and better network connectivity for DNC and monitoring. For experienced MAZATROL users, the transition to SmoothG is intuitive.

04 What threading capability does the QT-COMPACT 300 have?

The QT-COMPACT 300 supports single-point threading, taper threading, and multi-start threading as standard turning center functions. Thread pitch is controlled by the spindle encoder synchronized with the Z-axis ballscrew. Standard metric and inch thread pitches are supported natively in MAZATROL conversational programming.

05 How does the QT-COMPACT 300 compare to the Haas ST-20?

The Haas ST-20 is a direct competitor at similar bar capacity and price. The ST-20 offers a larger 12-station turret and higher spindle speeds (6,000 RPM vs 4,500 RPM on the QT-COMPACT 300). The QT-COMPACT 300 advantages are MAZATROL conversational programming and Mazak's reputation for precision. For shops already standardized on Mazak controls, the QT-COMPACT 300 is the natural choice. For shops cost-optimizing, the Haas is typically 10-20% less expensive.