Haas ST-28L

$75,000 - $105,000 Updated 2026-03-19

Key Specifications

Max Spindle

3,200 RPM

Spindle Taper

A2-8

Tool Capacity

12-station BOT

Spindle Power

40.0 hp

max swing

533 mm (21 in)

max cutting diameter

11.75 in

Overview

The Haas ST-28L is the long-bed variant of the big-bore ST-28, extending the Z-axis to 813 mm (32 in) while retaining the ST-28's 102 mm (4 in) bar capacity, 305 mm (12 in) chuck, and 29.8 kW (40 hp) spindle on an A2-8 nose. It is the smallest long-bed Haas lathe with 4-inch bore capacity, filling a critical gap for shops machining longer tube and pipe in a compact frame.

The spindle puts out 576 Nm (425 ft-lb) of torque at 325 RPM, topping out at 3,200 RPM. The 117.3 mm (4.62 in) spindle bore comfortably handles through-spindle work within the 4-inch bar range. Combined with the 12-inch chuck and A2-8 nose, the ST-28L provides heavy-duty workholding for longer large-bore parts.

Axis travels are 239 mm (9.4 in) in X and 813 mm (32 in) in Z with rapids at 24 m/min (945 ipm) on both axes. Maximum thrust forces of 18,238 N (4,100 lbf) in X and 22,686 N (5,100 lbf) in Z keep the tool engaged during heavy cuts on longer workpieces.

The ST-28L fills a specific production niche: shops running 4-inch tube and pipe on parts that exceed the standard ST-28's 572 mm (22.5 in) Z-travel but don't need the ST-35L's heavier frame or larger cutting envelope. Hydraulic cylinder manufacturers, pipe threading shops, and oil and gas component producers are the primary buyers.

At roughly $75,000-$105,000 configured, the ST-28L delivers 40 hp, 4-inch bore, and 32-inch Z-travel in a mid-size frame. The 12-station BOT turret, NGC control, and consistent Haas operator experience apply across the entire ST lineup.

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	576 Nm (425 ft-lb) @ 325 RPM
X Axis Travel	239 mm (9.4 in)
Z Axis Travel	813 mm (32 in)
Rapid Traverse X	24 m/min (945 ipm)
Rapid Traverse Z	24 m/min (945 ipm)
Max Thrust X	4100 lbf
Max Thrust Z	5100 lbf
Tool Capacity	12-station BOT
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
Z Axis	42.50 in
Feedrates	S.A.E
Rapids On X	945 ipm
Rapids On Z	945 ipm
Axis Motors	S.A.E
Spindle	S.A.E
Spindle Taper	A2-8
Max Rating	40.0 hp
Max Speed	3200 rpm
Max Torque	425.0 ft-lbf @ 325 rpm
Turret	S.A.E
Od Vs Id Tools	Any Combination (will vary with turret)
Boring Bar Rear Clearance	4.00 in
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	190.0 in x 90.0 in x 90.0 in
Export Pallet	190.0 in x 90.0 in x 90.0 in
Machine Weight	12000 lb

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

Strengths & Limitations

Strengths

4-inch bar capacity and 4.62-inch spindle bore on a long bed handle tube and pipe work that the ST-25L cannot swallow
40 hp spindle with 425 ft-lb of torque provides heavy roughing power on longer large-bore parts
813 mm (32 in) Z-axis travel extends the ST-28's reach for longer pipe, tube, and cylindrical components
12-inch chuck on A2-8 nose provides heavy-duty workholding without the weight and cost of the ST-35L platform
Same mid-size frame footprint as the ST-25L, keeping floor space manageable despite the larger bore
At $75-105K configured, significantly cheaper than the large-frame ST-35L while matching its 4-inch bore capacity

Limitations

3,200 RPM max spindle speed is the lowest in the mid-size long-bed lineup, limiting surface speeds on small-diameter work
Same 13-inch max cutting diameter as the standard ST-28 — only the Z-axis is extended
No Y-axis option on the base ST-28L for off-center features
40 hp motor draws more power than the 30 hp ST-25L, increasing utility costs when not consistently using the extra power

Best For

Pipe and tube machining in oil and gas and petrochemical applications requiring 4-inch bore and extended length Hydraulic cylinder manufacturers machining longer cylinders and valve bodies in 4-inch tube stock Production bar work in 3-inch to 4-inch stock on parts exceeding 572 mm turning length Shops needing 4-inch bore capacity on a long bed without the floor space and weight of the ST-35L Heavy roughing applications on longer carbon steel and alloy steel parts where 40 hp and 425 ft-lb of torque are needed

Frequently Asked Questions

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

Base price starts around $75,000. Adding tailstock, chip conveyor, high-pressure coolant, and bar feeder interface pushes the configured price to $90,000-$105,000. The long-bed premium over the standard ST-28 is approximately $5,000-$8,000.

02 How does the ST-28L compare to the ST-35L?

Both offer 4-inch bar capacity and 40 hp. The ST-35L has a larger cutting envelope at 381 x 1,016 mm (15 x 40 in) versus the ST-28L's 330 x 813 mm (13 x 32 in), plus a larger swing (806 vs 533 mm) and heavier casting. The ST-28L saves floor space and cost. The ST-35L extends cutting reach and adds rigidity.

03 What is the difference between the ST-28 and ST-28L?

The ST-28L extends the Z-axis from 572 mm (22.5 in) to 813 mm (32 in). The spindle, chuck, bar capacity, and power specs are identical. Choose the L variant when your parts regularly exceed 22.5 inches in turning length.

04 Is the ST-28L suitable for long pipe threading?

Yes. The 4-inch bar capacity, A2-8 spindle nose, 12-inch chuck, and 32-inch Z-travel make it well-suited for pipe threading, facing, and OD turning on standard pipe sizes up to 813 mm in length. For pipe work exceeding 32 inches, step up to the ST-35L with 40-inch Z-travel.