Haas ST-28LY

$130,000 - $160,000 Updated 2026-03-19

Key Specifications

Max Spindle

3,200 RPM

Spindle Taper

A2-8

Tool Capacity

12 Stations

Spindle Power

40.0 hp

max swing

533 mm (21 in)

max cutting diameter

11.75 in

Overview

The Haas ST-28LY is the long-bed, Y-axis variant of the big-bore ST-28 platform, combining 29.8 kW (40 hp) of spindle power, 102 mm (4 in) bar capacity, and a 12-station BMT-65 turret with 6,000 RPM live tooling on an extended Z-axis bed. It is the smallest long-bed Haas lathe with 4-inch bore and Y-axis mill-turn capability.

The A2-8 spindle delivers 542 Nm (400 ft-lb) of torque at 500 RPM, topping out at 3,200 RPM. Y-axis travel is +/-50.8 mm (+/-2.0 in), and the BMT-65 turret runs live tooling at 6,000 RPM with 3.7 kW (5 hp). The C-axis holds +/-0.01 degrees for precision milling and positioning. The 305 mm (12 in) chuck on the A2-8 nose provides heavy-duty clamping for larger workpieces.

Max cutting diameter is approximately 406 mm (16 in) and the extended Z-axis provides approximately 813 mm (32 in) of turning length. Axis travels are 239 mm (9.4 in) in X, +/-50.8 mm in Y, and 813 mm in Z. Rapids run at 12 m/min (472 ipm) on X and Y, and 24 m/min (945 ipm) on Z.

The ST-28LY fills a critical niche for shops machining longer pipe fittings, valve bodies, and tubular components in 4-inch bar stock that require cross-drilling, milling, and tapping. The combination of 4-inch bore, 40 hp, Y-axis, and long bed on a mid-size frame is unique in the Haas lineup.

At roughly $130,000-$160,000 configured, the ST-28LY delivers big-bore mill-turn capability on a long bed without the weight and cost of the ST-35 large-frame platform. It is the done-in-one workhorse for oil and gas, hydraulic, and heavy industrial shops running large-bore long parts with cross-features.

Full Specifications

Parameter	Value
Max Swing	533 mm (21 in)
Max Cutting Diameter	11.75 in
Max Cutting Length	42.5 in
Chuck Size	12.0 in
Bar Capacity	4.00 in
Spindle Nose	A2-8
Spindle Bore	4.62 in
Max Spindle Speed	3,200 RPM
Spindle Motor Power	40.0 hp
Spindle Torque	542 Nm (400 ft-lb) @ 500 RPM
X Axis Travel	239 mm (9.4 in)
Y Axis Travel	+/-50.8 mm (+/-2.0 in)
Z Axis Travel	813 mm (32 in)
Rapid Traverse X Y	12 m/min (472 ipm)
Rapid Traverse Z	24 m/min (945 ipm)
Tool Capacity	12 Stations
Live Tool Speed	6,000 RPM
Live Tool Power	3.7 kW (5 hp)
C Axis Accuracy	+/-0.01 degrees
Coolant Capacity	55 gal
CNC Control	Haas Next Generation Control (NGC)
Capacities	S.A.E
Max Part Swing	21.0 in
Travels	S.A.E
X Axis	9.40 in
Y Axis	± 2.0 in
Z Axis	42.50 in
Feedrates	S.A.E
Rapids On X	472 ipm
Rapids On Y	472 ipm
Rapids On Z	945 ipm
Axis Motors	S.A.E
Max Thrust X	4100 lbf
Max Thrust Y	2300 lbf
Max Thrust Z	5100 lbf
Spindle	S.A.E
Spindle Taper	A2-8
Max Rating	5.0 hp
Max Speed	4000 rpm
Max Torque	425.0 ft-lbf @ 325 rpm
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
Turret	S.A.E
Od Vs Id Tools	Any Combination (will vary with turret)
Boring Bar Rear Clearance	4.00 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	143.0 in x 90.0 in x 91.0 in
Export Pallet	143.0 in x 90.0 in x 91.0 in
Machine Weight	12700 lb

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

Strengths & Limitations

Strengths

4-inch bar capacity with Y-axis and live tooling on a long bed — the only mid-size Haas long-bed mill-turn with this bore
40 hp spindle with 400 ft-lb torque handles heavy roughing on large-bore long parts in steel and stainless
BMT-65 turret with 6,000 RPM live tooling at 5 hp enables aggressive cross-drilling and milling on large-bore parts
12-inch chuck on A2-8 nose provides heavy-duty clamping for larger workpieces with cross-features
813 mm (32 in) Z-axis travel handles pipe fittings and valve bodies that exceed the standard ST-28Y bed
Mid-size frame saves floor space versus the ST-35 large-frame platform while matching 4-inch bore capacity

Limitations

3,200 RPM max spindle speed is the lowest in the mid-size lineup, limiting surface speeds on smaller-diameter work
3.7 kW (5 hp) live tooling limits milling aggressiveness on tougher materials at larger widths of cut
No sub-spindle option on the mid-size frame — back-working still requires a second setup
40 hp motor and Y-axis drives increase electrical requirements and utility costs versus simpler variants

Best For

Oil and gas manufacturers machining longer pipe fittings and valve bodies with cross-holes in 4-inch tube stock Hydraulic cylinder and manifold shops running large-bore bar with milling and drilling requirements on longer parts Done-in-one production of large-bore components with cross-features that previously required lathe plus VMC Shops stepping up from the ST-25LY that need 4-inch bore and 40 hp for heavier large-bore mill-turn work Heavy industrial shops machining flanged components with cross-drilling and tapping along their length

Frequently Asked Questions

01 What does a new Haas ST-28LY cost?

Base price starts around $130,000. Adding tailstock, chip conveyor, high-pressure coolant, and common options pushes configured price to $145,000-$160,000. The long-bed Y-axis premium over the standard ST-28 is approximately $55,000-$60,000.

02 How does the ST-28LY compare to the ST-25LY?

The ST-28LY upgrades to 40 hp (vs 30 hp), 400 ft-lb torque (vs 300 ft-lb), 4-inch bore (vs 3-inch), 12-inch chuck (vs 10-inch), and A2-8 nose (vs A2-6). Both share the same 32-inch Z-travel, Y-axis, and BMT-65 live tooling. The ST-28LY costs $15,000-$20,000 more for significantly more bore and power.

03 What is the difference between the ST-28Y and ST-28LY?

The ST-28LY extends the Z-axis from approximately 572 mm (22.5 in) to 813 mm (32 in). The spindle, Y-axis, turret, and live tooling are identical. Choose the LY when your large-bore parts with cross-features regularly exceed 22.5 inches.

04 Is the ST-28LY suitable for pipe fitting work with cross-holes?

Yes, this is one of its primary applications. The 4-inch bore handles standard pipe sizes through the spindle, the Y-axis enables off-center cross-drilling and tapping, and the 32-inch Z-travel covers longer fittings. The NGC control supports canned cycles for both turning and milling operations.