Haas SB-28

$75,000 - $100,000 Updated 2026-03-12

Key Specifications

Max Spindle

3,200 RPM

Spindle Taper

A2-8

Tool Capacity

12 Stations

Weight

7,711 kg (17,000 lb)

Spindle Power

40.0 hp

max cutting diameter

13.50 in

Overview

The Haas SB-28 is a box-way CNC turning center that prioritizes rigidity and vibration damping over the linear-guide speed of the ST series. Where the ST models ride on linear guides for faster rapids, the SB-28 uses hardened and ground box ways that provide superior load capacity and damping characteristics. For shops cutting tough materials, running heavy interrupted cuts, or turning large-diameter chucked parts, that difference matters.

The spindle delivers 29.8 kW (40 hp) with a max speed of 3,200 RPM on an A2-6 spindle nose. Peak torque sits at 542 Nm (400 ft-lb) at 500 RPM, with an optional gearbox pushing 1,898 Nm (1,400 ft-lb) at 150 RPM. The 254 mm (10 in) chuck and 74 mm (2.9 in) bar capacity handle the majority of production bar stock sizes. Spindle bore is 89 mm (3.5 in).

The box-way construction shows its advantage on heavy roughing. The ways absorb vibration that would cause chatter on linear-guide machines, allowing deeper depths of cut and higher feed rates in tough materials like stainless steel, Inconel, and hardened alloys. Thermal growth is also more predictable on box ways because the contact surface area is larger and distributes heat more evenly.

The SB-28 uses a 12-station bolt-on turret without live tooling in the base configuration. This is a turning-focused machine. No Y-axis, no live tooling standard. If you need milling, Haas offers the SB-28Y with Y-axis and live tooling at a higher price point. The base SB-28 is for shops that want the best possible turning rigidity and finish at the most competitive price.

At $75,000-$100,000 configured, the SB-28 undercuts the ST-25Y and competes with the Doosan Puma 2600 series and Okuma LB3000 EX II in the box-way segment. It is a straightforward turning machine built for shops that value cut quality and rigidity over speed and multi-tasking features. Popular in oil and gas, heavy equipment, and defense shops working in demanding materials. Specs sourced from Haas Automation published data.

Full Specifications

Parameter	Value
Max Cutting Diameter	13.50 in
Max Cutting Length	21.3 in
Max Swing Over Front Apron	806 mm (31.75 in)
Max Swing Over Cross Slide	527 mm (20.75 in)
Max Spindle Speed	3,200 RPM
Spindle Motor Power	40.0 hp
Spindle Torque	542 Nm (400 ft-lb) @ 500 RPM
Spindle Torque Optional Gearbox	1,898 Nm (1,400 ft-lb) @ 150 RPM
Spindle Nose	A2-6
Spindle Bore	3.39 in
Chuck Size	10.0 in
Bar Capacity	2.90 in
X Axis Travel	318 mm (12.5 in)
Z Axis Travel	711 mm (28 in)
Rapid Traverse X	10.2 m/min (400 IPM)
Rapid Traverse Z	15.2 m/min (600 IPM)
Tool Capacity	12 Stations
Way Type	Hardened and ground box ways
Coolant Capacity	40 gal
Machine Weight	7,711 kg (17,000 lb)
CNC Control	Haas Next Generation Control (NGC)
Capacities	S.A.E
Max Part Swing	23.6 in
Between Centers Max	29.7 in
Travels	S.A.E
X Axis	9.00 in
Z Axis	23.20 in
Feedrates	S.A.E
Rapids On X	630 ipm
Rapids On Z	787 ipm
Axis Motors	S.A.E
Max Thrust X	7780 lbf
Max Thrust Z	7780 lbf
Spindle	S.A.E
Spindle Taper	A2-8
Max Rating	5.0 hp
Max Speed	4000 rpm
Max Torque	300.0 ft-lbf @ 500 rpm
Draw Tube Bore	2.95 in
Main Spindle C Axis	S.A.E
Positioning	0.01 °
Brake Diameter	13.9 in
Brake Holding Torque	250 ft-lbf
Control Type	Interpolated Motion and Positioning
Tailstock	S.A.E
Taper	MT5
Travel	19.7 in
Turret	S.A.E
Od Vs Id Tools	Any Combination (will vary with turret)
Boring Bar Rear Clearance	2.00 in
Live Tooling	S.A.E
Tooling	BMT65
General	S.A.E
Air Requirements	S.A.E
Air Required	4 scfm @ 100 psi
Inline Air Hose	3/8 in
Coupler	3/8 in
Air Pressure Min	80 psi
Electrical Specification	S.A.E
Drive System	Direct Speed, Belt Drive
Input Ac Voltage Low	220 VAC
Full Load Amps Low	70 A
Input Ac Voltage High	440 VAC
Full Load Amps High	35 A
Dimensions Shipping	S.A.E
Domestic Pallet	172.0 in x 90.0 in x 81.0 in
Export Pallet	172.0 in x 90.0 in x 81.0 in
Machine Weight	12600 lb

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

Strengths & Limitations

Strengths

Box-way construction provides superior rigidity and vibration damping compared to linear-guide ST-series machines
40 hp spindle with 400 ft-lb of torque handles heavy roughing in stainless, Inconel, and hardened alloys without chatter
Optional gearbox delivers 1,400 ft-lb at 150 RPM for large-diameter interrupted cuts in the toughest materials
At $75-100K, it undercuts comparable box-way lathes from Okuma and Doosan by a meaningful margin
17,000 lb machine mass provides excellent thermal stability for tight-tolerance production turning
Same NGC control as every Haas machine for consistent programming and operator training
Box ways handle higher load capacity than linear guides, extending machine life under heavy cutting conditions

Limitations

Slower rapids at 400 IPM in X and 600 IPM in Z compared to ST-series linear-guide machines at 472/945 IPM
No live tooling or Y-axis in the base SB-28 configuration limits it to turning-only operations
Box ways require more careful lubrication and maintenance than linear guides to prevent wear
No sub-spindle option limits done-in-one capability for parts needing back-working
Bolt-on turret is less rigid than the BMT-65 used on ST-Y models for shops that add optional live tooling

Best For

Heavy-duty production turning in tough materials like stainless steel, Inconel, titanium, and hardened alloys Oil and gas shops machining valve components, fittings, and pipe flanges that demand cut quality over speed Defense and aerospace shops running demanding materials where rigidity and vibration damping are critical Shops that prioritize surface finish and dimensional accuracy on turned components over multi-tasking features Production environments replacing older box-way lathes that want to maintain rigidity at a modern price point Heavy equipment manufacturers turning large castings and forgings with heavy depths of cut

Frequently Asked Questions

01 What does a new Haas SB-28 cost?

Base price starts around $75,000. Configured with tailstock, chip conveyor, gearbox, and high-pressure coolant, expect $85,000-$100,000. The optional gearbox is a common add-on for shops cutting tough materials.

02 What is the difference between the SB-28 and the ST-25Y?

The SB-28 uses box ways for rigidity while the ST-25Y uses linear guides for speed. The ST-25Y adds Y-axis and live tooling for milling. The SB-28 is for shops that need the best possible turning performance. The ST-25Y is for shops that need both turning and milling in one machine.

03 Why choose box ways over linear guides?

Box ways provide more surface contact area, better vibration damping, and higher load capacity. They excel at heavy roughing, interrupted cuts, and machining tough materials. Linear guides offer faster rapids and acceleration, which reduces cycle time on lighter cutting operations.

04 Can I add live tooling to the SB-28?

Not to the base SB-28. Haas offers the SB-28Y model with Y-axis and live tooling for shops that need both box-way rigidity and milling capability. The SB-28Y costs about $50,000 more than the base SB-28.

05 How does the SB-28 compare to the Okuma LB3000 EX II?

The Okuma offers tighter tolerances, a more refined control, and better out-of-the-box accuracy. It also costs $30-50K more. The SB-28 delivers competitive rigidity at a Haas price point with the advantage of the HFO service network.