Johnford ST-240B
Image: johnford.com.tw, Johnford
Key Specifications
Max Spindle
Rapid Traverse
Spindle Power
swing over bed
swing over cross slide
chuck size
How much does the Johnford ST-240B cost?
Price estimate
We do not have a price for the Johnford ST-240B 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
Six metres is the limit of the ST series, and the Johnford ST-240B is the lightest way to get there: 6,050 mm (238.2 in) of Z travel at 32,100 kg (70,620 lb).
The other six-metre models on this frame, the ST-240C and ST-240D, weigh 32,200 kg (70,840 lb) and 32,500 kg (71,500 lb). The differences are small because the bed, carriage and tailstock are shared and only the headstock changes. What separates the three is the spindle, and the B version has the smallest and fastest: A2-11, 132.5 mm (5.2 in) bore, 116 mm (4.6 in) bar capacity and 2,000 rpm.
Tailstock travel is 5,400 mm (212.6 in), so the tailstock cannot follow the carriage over the whole Z stroke; very short parts are held at the headstock end. The quill is Ø200 mm (7.9 in) with an MT#7 taper.
The machine is 11,667 mm (459.3 in) long, which is not much more than the five-metre ST-200B at 11,267 mm (443.6 in). Width and height are 2,504 mm (98.6 in) and 2,895 mm (114 in). Standard power is 22 / 26 kW (29.5 / 34.9 hp), with 30 / 37 kW (40.2 / 49.6 hp) optional.
Full Specifications
| Parameter | Value |
|---|---|
| Swing Over Bed | 920 mm (36.2 in) |
| Swing Over Cross Slide | 700 mm (27.6 in) |
| Chuck Size | 381 mm (15 in) |
| Chuck Size Optional | 450 mm (17.7 in) |
| Bar Capacity | 116 mm (4.6 in) |
| Spindle Nose | A2-11 |
| Spindle Bore | 132.5 mm (5.2 in) |
| Spindle Transmission | Auto 4 speeds |
| Max Spindle Speed | 2,000 rpm |
| Spindle Motor Power | 22 / 26 kW (29.5 / 34.9 hp) (Std.); 30 / 37 kW (40.2 / 49.6 hp) (Opt.) |
| Spindle Bearing Diameter | 180 mm (7.1 in) |
| Turret Stations | 12 |
| X Axis Travel | 370 mm (14.6 in) |
| Y Axis Travel Optional | ±75 mm (±3 in) |
| Z Axis Travel | 6,050 mm (238.2 in) |
| Rapid Traverse Rate | X: 10 m/min (394 ipm); Y: 10 m/min (394 ipm); Z: 12 m/min (472 ipm) |
| Tailstock Travel | 5,400 mm (212.6 in) |
| Tailstock Quill Travel | 150 mm (5.9 in) |
| Tailstock Quill Diameter | Ø200 mm (Ø7.9 in) |
| Tailstock Taper | MT#7 |
| Servo Motor X | 7 kW |
| Servo Motor Y Optional | 3 kW |
| Servo Motor Z | 7 kW |
| Bed Inclination | 60° |
| Machine Weight | 32,100 kg (70,620 lb) |
| Machine Dimensions | 11,667 x 2,504 x 2,895 mm (459.3 x 98.6 x 114 in) |
Specifications sourced from johnford.com.tw — verified 2026-10-04
Strengths & Limitations
Strengths
- 6,050 mm (238.2 in) of Z travel, the longest in the ST series
- Lightest of the six-metre models at 32,100 kg (70,620 lb)
- Tailstock travel of 5,400 mm (212.6 in)
- 2,000 rpm spindle with four automatic speeds
- Swing over the bed of 920 mm (36.2 in)
Limitations
- 132.5 mm (5.2 in) bore and 116 mm (4.6 in) bar capacity
- 22 / 26 kW (29.5 / 34.9 hp) as standard
- 11,667 mm (459.3 in) long
- Rapid traverse of 12 m/min on a 6,050 mm (238.2 in) axis
Best For
Frequently Asked Questions
01
The models numbered 240, with 6,050 mm (238.2 in) of Z travel. On this frame they are the ST-240B, ST-240C and ST-240D, which differ in spindle size. The ST-240B has the A2-11 spindle.
02
32,100 kg (70,620 lb). The ST-240C is listed at 32,200 kg (70,840 lb) and the ST-240D at 32,500 kg (71,500 lb).
03
In travel, yes: 6,050 mm (238.2 in) against 5,050 mm (198.8 in) on the ST-200B. In outside length the table lists 11,667 mm (459.3 in) against 11,267 mm (443.6 in) for the ST-200B.
04
5,400 mm (212.6 in). The quill adds 150 mm (5.9 in), is Ø200 mm (7.9 in) in diameter and has an MT#7 taper. The tailstock is programmable and hydraulic.
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