Sharp STB-44
Image: sharp-industries.com, Sharp
Key Specifications
Spindle Power
swing over bed
swing over cross slide
distance between centers
spindle bore
control
How much does the Sharp STB-44 cost?
Price estimate
We do not have a price for the Sharp STB-44 that we can stand behind, so we show no number. Configuration, options and installation move the final price a long way: a quote is the reliable figure.
Overview
Bore choice starts with the Sharp STB-44. This 44.09 in (1120 mm) swing big bore CNC lathe is the first size in the STB line where the table lists five spindle bores, 6 in (152 mm), 9 in (230 mm), 10 in (255 mm), 12 in (305 mm) and 15 in (380 mm), where the STB-38 below it is listed with the 6 in bore alone. Sharp's bullet list calls the 6" bore standard.
The frame is the same heavy one. A 31.89 in (810 mm) bed with 2 V, 2 Flat Ways carries the carriage, the bed and base are one casting, and the headstock spindle runs in one ball bearing and two tapered roller bearings. Over the cross slide the machine clears 27.56 in (700 mm), which is the figure to check for a pipe body that must run the length of the bed.
How do you hold a long tube that sticks out behind a 15 in bore? Sharp offers a rear chuck adapter so a second chuck can be mounted on the back of the headstock; it is an option, like the double chucks it serves.
Six beds cover 59.06 in (1,500 mm) to 236.22 in (6,000 mm) between centers. The STB-4460 weighs 30,800 lb (14,000 kg) and the STB-44240 42,700 lb (19,400 kg). A 30 hp spindle motor is standard with 40 hp or 50 hp optional, and speed changes through four steps by M code.
Full Specifications
| Parameter | Value |
|---|---|
| Swing Over Bed | 44.09 in (1120 mm) |
| Swing Over Cross Slide | 27.56 in (700 mm) |
| Distance Between Centers | STB-4460: 59.06 in (1,500 mm); STB-4480: 78.74 in (2,000 mm); STB-44120: 118.11 in (3,000 mm); STB-44160: 157.48 in (4,000 mm); STB-44200: 196.85 in (5,000 mm); STB-44240: 236.22 in (6,000 mm) |
| Spindle Bore | 6 in (152 mm) 9 in (230 mm) 10 in (255 mm) 12 in (305 mm) 15 in (380 mm) |
| CNC Control | FANUC Oi-TF |
| Bed Way Type | 2 V, 2 Flat Ways |
| Bed Width | 31.89 in (810 mm) |
| Bed Length | STB-4460: 155.91 in (3960 mm); STB-4480: 175.59 in (4460 mm); STB-44120: 214.96 in (5460 mm); STB-44160: 254.33 in (6460 mm); STB-44200: 293.70 in (7460 mm); STB-44240: 333.07 in (8460 mm) |
| X Axis Travel | 23.62 in (600 mm) |
| Z Axis Travel | STB-4460: 45.28 in (1150 mm); STB-4480: 64.96 in (1650 mm); STB-44120: 104.33 in (2650 mm); STB-44160: 143.70 in (3650 mm); STB-44200: 183.07 in (4650 mm); STB-44240: 222.44 in (5650 mm) |
| X Axis Ballscrew Diameter | 1.57 in (40 mm) |
| Z Axis Ballscrew Diameter | 2.48 in (63 mm) |
| Spindle Motor Power | 30 hp (STD Fanuc Alpha 22) Opt: 40 hp or 50 hp |
| X Axis Motor | 5.3 hp (Fanuc AC servo) |
| Z Axis Motor | STB-4460: 5.3 hp (Fanuc AC servo); STB-4480: 5.3 hp (Fanuc AC servo); STB-44120: 5.3 hp (Fanuc AC servo); STB-44160: 9.3 hp (Fanuc AC servo); STB-44200: 9.3 hp (Fanuc AC servo); STB-44240: 9.3 hp (Fanuc AC servo) |
| Hydraulic Pump Motor | 2 hp (1.5 kW) |
| Coolant Pump Motor | 1.7 hp (1.27 kW) |
| Machine Weight | STB-4460: 30,800 lb (14,000 kg); STB-4480: 32,200 lb (14,600 kg); STB-44120: 34,800 lb (15,800 kg); STB-44160: 37,400 lb (17,000 kg); STB-44200: 40,100 lb (18,200 kg); STB-44240: 42,700 lb (19,400 kg) |
| Machine Length | STB-4460: 229.0 in (5,816 mm); STB-4480: 248.7 in (6,316 mm); STB-44120: 288.0 in (7,316 mm); STB-44160: 327.4 in (8,316 mm); STB-44200: 366.8 in (9,316 mm); STB-44240: 406.1 in (10,316 mm) |
| Machine Width | 122.0 in (3,100 mm) |
| Machine Height | 89.4 in (2,270 mm) |
Specifications sourced from sharp-industries.com — verified 2026-10-04
Strengths & Limitations
Strengths
- Five listed spindle bores from 6 in (152 mm) to 15 in (380 mm)
- 27.56 in (700 mm) swing over the cross slide
- Headstock spindle supported by one ball bearing and two tapered roller bearings
- One-piece bed and base casting, 31.89 in (810 mm) wide
- M code 4 step auto change speeds on a 30 hp motor
Limitations
- Bores above 6" are not the standard build
- X-axis travel of 23.62 in (600 mm) varies with the turret installed
- Rear chuck adapter and double chucks are options, not standard equipment
- The three shorter beds keep the 5.3 hp Z-axis servo
Best For
Frequently Asked Questions
01
Sharp's table lists 6 in (152 mm), 9 in (230 mm), 10 in (255 mm), 12 in (305 mm) and 15 in (380 mm). The overview bullet reads 6" standard, followed by the four larger sizes, and the feature text adds that double chucks are available as options.
02
The STB-38 swings 37.79 in (960 mm) over the bed and 21.26 in (540 mm) over the cross slide; the STB-44 swings 44.09 in (1120 mm) and 27.56 in (700 mm). The STB-44 adds the larger bores. Bed width, X travel, motors and outside dimensions are the same in both tables. In its shortest form the STB-44 weighs 30,800 lb (14,000 kg), where the shortest STB-38 is listed at 28,600 lb (13,000 kg).
03
Turrets are options. The accessory list names a hydraulic 4-way turret, a hydraulic V-8 turret and a hydraulic V-12 turret; the V-8 and V-12 come with three boring toolholders, one facing toolholder and a turret sleeve. Sharp notes that X-axis travel, 23.62 in (600 mm), varies with the turret.
04
Width is 122.0 in (3,100 mm) and height 89.4 in (2,270 mm) for every bed. Length with the chip conveyor is 229.0 in (5,816 mm) for the STB-4460 and 406.1 in (10,316 mm) for the STB-44240, with a flat belt conveyor on the standard accessory list.
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