Sharp STB-50

Q: How much does the Sharp STB-50 cost?

The price estimate for the Sharp STB-50 is uncertain: we have no price for it that we can cite and no estimate we can stand behind, so we give no figure. Configuration, tooling, automation and installation move the final price substantially. A specific price can be requested at https://machinetoolindex.com/machines/sharp-stb-50#price; the request is passed to Sharp or an authorised dealer.

Specs verified 2026-10-04 · sharp-industries.com Updated 2026-10-04

Sharp STB series big bore CNC lathe (series photo shown on the STB-50 page)

Image: sharp-industries.com, Sharp

Key Specifications

Spindle Power

30 hp (STD Fanuc Alpha 22) Opt: 40 hp or 50 hp

swing over bed

51.97 in (1320 mm)

swing over cross slide

35.43 in (900 mm)

distance between centers

STB-5060: 59.06 in (1,500 mm); STB-5080: 78.74 in (2,000 mm); STB-50120: 118.1 in (3000 mm); STB-50160: 157.48 in (4,000 mm); STB-50200: 196.85 in (5,000 mm); STB-50240: 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)

control

FANUC Oi-TF

How much does the Sharp STB-50 cost?

Price estimate

Uncertain

We do not have a price for the Sharp STB-50 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

A 51.97 in (1320 mm) swing over the bed and 35.43 in (900 mm) over the cross slide define the Sharp STB-50, the middle size of the STB big bore flat bed CNC lathes. It is aimed at work that is both large in diameter and heavy: flanged pipe, rolls, big couplings.

Compare the two swing figures before anything else. The gap between them is the height the carriage takes up, and anything longer than the chuck jaws can hold alone has to fit under the lower one. Against the STA-50, which clears 37.79 in (960 mm) over its cross slide, the STB-50 gives up a little of that room in exchange for a 31.89 in (810 mm) bed in place of a 24 in (610 mm) one.

Weights need a second look. Sharp's table prints 36,600 lb (16,600 kg) for both the STB-50120 and the STB-50160, while every other step in the row climbs with bed length, starting at 32,600 lb (14,800 kg) on the shortest bed and ending at 44,500 lb (20,200 kg) on the longest. Ask for the shipping weight of the bed you are buying before sizing a foundation or a crane.

Drive and travel follow the rest of the line. X travel is 23.62 in (600 mm). Ball screws are 1.57 in (40 mm) on X and 2.48 in (63 mm) on Z, and the standard accessory list calls them C3 grade with Turcite-B on the slideways.

Full Specifications

Parameter	Value
Swing Over Bed	51.97 in (1320 mm)
Swing Over Cross Slide	35.43 in (900 mm)
Distance Between Centers	STB-5060: 59.06 in (1,500 mm); STB-5080: 78.74 in (2,000 mm); STB-50120: 118.1 in (3000 mm); STB-50160: 157.48 in (4,000 mm); STB-50200: 196.85 in (5,000 mm); STB-50240: 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-5060: 155.91 in (3960 mm); STB-5080: 175.59 in (4460 mm); STB-50120: 214.96 in (5460 mm); STB-50160: 254.33 in (6460 mm); STB-50200: 293.70 in (7460 mm); STB-50240: 333.07 in (8460 mm)
X Axis Travel	23.62 in (600 mm)
Z Axis Travel	STB-5060: 45.28 in (1150 mm); STB-5080: 64.96 in (1650 mm); STB-50120: 104.33 in (2650 mm); STB-50160: 143.70 in (3650 mm); STB-50200: 183.07 in (4650 mm); STB-50240: 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-5060: 5.3 hp (Fanuc AC servo); STB-5080: 5.3 hp (Fanuc AC servo); STB-50120: 5.3 hp (Fanuc AC servo); STB-50160: 9.3 hp (Fanuc AC servo); STB-50200: 9.3 hp (Fanuc AC servo); STB-50240: 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-5060: 32,600 lb (14,800 kg); STB-5080: 33,900 lb (15,400 kg); STB-50120: 36,600 lb (16,600 kg); STB-50160: 36,600 lb (16,600 kg); STB-50200: 41,900 lb (19,000 kg); STB-50240: 44,500 lb (20,200 kg)
Machine Length	STB-5060: 229.0 in (5,816 mm); STB-5080: 248.7 in (6,316 mm); STB-50120: 288.0 in (7,316 mm); STB-50160: 327.4 in (8,316 mm); STB-50200: 366.8 in (9,316 mm); STB-50240: 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

51.97 in (1320 mm) swing over the bed, 35.43 in (900 mm) over the cross slide
2.48 in (63 mm) Z-axis ball screw, listed as C3 grade
Turcite-B on the X and Z slideways as standard
Bores of 6 in (152 mm) to 15 in (380 mm) in the table
Six beds up to 236.22 in (6,000 mm) between centers

Limitations

The weight row repeats 36,600 lb (16,600 kg) for two different bed lengths
Cross slide clearance is below the 37.79 in (960 mm) of the STA-50
X travel of 23.62 in (600 mm) is less than half the swing
Turrets, rear chuck adapter and spindle chiller are all optional

Best For

Rolls and flanged pipe up to 35.43 in over the carriage Large-bore casing and couplings Heavy interrupted cuts that suit a 31.89 in bed Long shafts on beds up to 236.22 in between centers

Frequently Asked Questions

01 What are the swing figures of the STB-50?

Maximum swing over the bed is 51.97 in (1320 mm) and swing over the cross slide is 35.43 in (900 mm). The first applies to short work held at the chuck, the second to anything the carriage has to travel under.

02 Why does the STB-50 table show the same weight for two lengths?

Sharp's weight row gives 36,600 lb (16,600 kg) for the STB-50120 and again for the STB-50160. The STB-5080 is listed at 33,900 lb (15,400 kg) and the STB-50200 is listed at 41,900 lb (19,000 kg), so one of the two repeated entries is likely a misprint. Confirm it with Sharp.

03 Is the STB-50 better than the STA-50 for my work?

It depends on diameter over the slide and on load. The STA-50 clears 37.79 in (960 mm) over the cross slide and has a 24 in (610 mm) bed; the STB-50 clears 35.43 in (900 mm) on a 31.89 in (810 mm) bed. Swing over the bed and X travel, 51.97 in (1320 mm) and 23.62 in (600 mm), are the same on both.

04 What tailstock comes with the STB-50?

A manual tailstock, MT 6, is on the standard accessory list. Two upgrades are optional accessories: a tailstock with hydraulic quill, and a tailstock base with hydraulic lock bolt for clamping along the bed.