Haas ST-28LY
Image: haascnc.com, Haas Automation
Key Specifications
X Travel
Y Travel
Z Travel
Max Spindle
Spindle Power
Max Turn Length
How much does the Haas ST-28LY cost?
Manufacturer list price
As published by Haas Automation, verified 2026-10-02. Options, tooling, freight and installation are extra.
Overview
The Haas ST-28LY is the Y-axis, live-tool version of the big-bore long-bed lathe. It takes 4 in (102 mm) bar through a 4.62 in (117.3 mm) bore, holds work in a 12 in (305 mm) chuck, and mills along 42.5 in (1,080 mm) of Z with ± 2 in (± 51 mm) of Y and BMT65 tools at up to 4,000 rpm.
Large stock changes what a short Y stroke is worth. Travel of 2 in either side of centre matches the radius of the largest bar the spindle passes, so the tool centreline can reach from one edge of a 4 in bar to the other and a flat or slot can run across the whole section. On bigger chucked parts, features further from centre are reached by rotating the C axis.
The headstock is built for torque: 40 hp (29.8 kW), 425 ft-lbf (576 N·m) at 325 rpm, 3,200 rpm maximum. Live tools run faster than the spindle itself. The C axis positions to 0.01° and interpolates, turning at up to 60 rpm with a 5 hp (3.7 kW) rating, and its 13.9 in (353 mm) brake holds 250 ft-lbf (339 N·m).
Compared with the two-axis ST-28L, turning diameter falls from 13 in (330 mm) to 11.75 in (298 mm), which is less than the chuck size, and the X rapid falls from 945 ipm (24 m/min) to 472 ipm (12 m/min). The ST-28Y offers the same spindle and Y travel in a 22.5 in (572 mm) turning length at 10,860 lb (4,926 kg). This one weighs 12,700 lb (5,760 kg).
No sub-spindle rows appear in the table. Supply is 70 A at 220 VAC three-phase or 35 A at 440 VAC, with 4 scfm of air at 100 psi (113 L/min at 6.9 bar). Haas lists a starting price of US$179,995.
Full Specifications
| Parameter | Value |
|---|---|
| Chuck Size | 12 in (305 mm) |
| Max Swing | 21 in (533 mm) |
| Max Turning Diameter | 11.75 in (298 mm) |
| Max Turning Length | 42.5 in (1,080 mm) |
| Bar Capacity | 4 in (102 mm) |
| X-Axis Travel | 9.4 in (239 mm) |
| Y-Axis Travel | ± 2 in (± 51 mm) |
| Z-Axis Travel | 42.5 in (1,080 mm) |
| Rapid Traverse X | 472 ipm (12 m/min) |
| Rapid Traverse Y | 472 ipm (12 m/min) |
| Rapid Traverse Z | 945 ipm (24 m/min) |
| Max Thrust X | 4,100 lbf (18,238 N) |
| Max Thrust Y | 2,300 lbf (10,231 N) |
| Max Thrust Z | 5,100 lbf (22,686 N) |
| Spindle Nose | A2-8 |
| Spindle Motor Power | 40 hp (29.8 kW) |
| Max Spindle Speed | 3,200 rpm |
| Spindle Torque | 425 ft-lbf @ 325 rpm (576 N·m @ 325 rpm) |
| Spindle Bore | 4.62 in (117.3 mm) |
| C Axis Speed | 60 rpm |
| C Axis Max Rating | 5 hp (3.7 kW) |
| C Axis Positioning | 0.01 ° |
| C Axis Brake Diameter | 13.9 in (353 mm) |
| C Axis Brake Holding Torque | 250 ft-lbf (339 N·m) |
| C Axis Control Type | Interpolated Motion and Positioning |
| Turret Stations | 12 |
| Turret OD Vs ID Tools | Any Combination (will vary with turret) |
| Turret Boring Bar Rear Clearance | 4 in (102 mm) |
| Live Tool Speed | 4,000 rpm |
| Live Tooling | BMT65 |
| Coolant Capacity | 55 gal (208 L) |
| Air Required | 4 scfm @ 100 psi (113 L/min @ 6.9 bar) |
| Inline Air Hose | 3/8 in |
| Air Coupler | 3/8 in |
| Air Pressure Min | 80 psi (5.5 bar) |
| Electrical Service (low voltage) | 220 VAC 3-phase, 70 A |
| Electrical Service (high voltage) | 440 VAC 3-phase, 35 A |
| Shipping Domestic Pallet | 143 × 90 × 91 in (363 × 229 × 231 cm) |
| Shipping Export Pallet | 143 × 90 × 91 in (363 × 229 × 231 cm) |
| Machine Weight | 12,700 lb (5,760 kg) |
Specifications sourced from haascnc.com — verified 2026-10-02
Strengths & Limitations
Strengths
- Y travel of ± 2 in (± 51 mm) spans the full 4 in (102 mm) bar capacity
- 40 hp (29.8 kW), 425 ft-lbf (576 N·m) main spindle with a 4.62 in (117.3 mm) bore
- 42.5 in (1,080 mm) of Z, against 22.5 in (572 mm) of turning length on the ST-28Y
- BMT65 live tools to 4,000 rpm in a 12-station turret
- C-axis brake of 250 ft-lbf (339 N·m) and 0.01° positioning for milling on large diameters
Limitations
- The 11.75 in (298 mm) turning diameter is smaller than the 12 in (305 mm) chuck
- The main spindle is limited to 3,200 rpm and the live tools to 4,000 rpm
- X and Y rapids are 472 ipm (12 m/min), half the 945 ipm (24 m/min) X rapid of the ST-28L
- No sub-spindle is listed in the table for this model
- Y thrust of 2,300 lbf (10,231 N) is well under the 5,100 lbf (22,686 N) available on Z
Best For
Frequently Asked Questions
01
A Y axis of ± 2 in (± 51 mm), an interpolating C axis and BMT65 live tools at 4,000 rpm. The ST-28L is two-axis, turns 13 in (330 mm) and weighs 12,000 lb. The ST-28LY turns 11.75 in (298 mm) and weighs 12,700 lb (5,760 kg). Chuck, bore, bar capacity and the 40 hp (29.8 kW) spindle are shared.
02
For the bar itself, yes: ± 2 in (± 51 mm) equals the radius of the 4 in (102 mm) bar capacity, so the tool centreline can travel across the full width of the largest bar. On chucked parts closer to the 11.75 in (298 mm) turning diameter the Y axis covers a band about the centreline, and the C axis indexes the part for anything outside it.
03
Control type is interpolated motion and positioning. Positioning is 0.01°, maximum speed 60 rpm and the maximum rating 5 hp (3.7 kW). The brake is 13.9 in (353 mm) in diameter with 250 ft-lbf (339 N·m) of holding torque.
04
Length and weight. The ST-28Y has 22.5 in (572 mm) of Z travel and weighs 10,860 lb (4,926 kg). The ST-28LY has 42.5 in (1,080 mm) and weighs 12,700 lb (5,760 kg). Both have the 12 in (305 mm) chuck, 4 in (102 mm) of bar capacity, the Y axis and 4,000 rpm live tools.
05
Three-phase power at 220 VAC and 70 A, or 440 VAC and 35 A. Air consumption is 4 scfm at 100 psi (113 L/min at 6.9 bar), and pressure at the machine must stay at or above 80 psi (5.5 bar). The coolant tank holds 55 gal (208 L).
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