Johnford ST-40BH
Key Specifications
Max Spindle
Rapid Traverse
Spindle Power
swing over bed
swing over cross slide
chuck size
How much does the Johnford ST-40BH cost?
Price estimate
We do not have a price for the Johnford ST-40BH 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
Facing and boring of wide parts is what the Johnford ST-40BH is laid out for: a 381 mm (15 in) chuck, 700 mm (27.6 in) of swing over the cross slide and 370 mm (14.6 in) of X travel on a bed with 800 mm (31.5 in) of Z.
The optional 450 mm (17.7 in) chuck belongs with this frame. It leaves a useful margin under the 700 mm (27.6 in) swing for jaws and for a part that overhangs them, which the 600 mm (23.6 in) of the plain ST-40B does not offer to the same degree.
For a facing cut across a large diameter, the four automatic speeds of the B spindle are an advantage. As the tool moves inward the control raises the speed to hold the surface speed, and a wider set of ratios keeps the motor closer to full power across that range. Top speed is 2,000 rpm; power is 22 / 26 kW (29.5 / 34.9 hp), or 30 / 37 kW (40.2 / 49.6 hp) with the optional motor.
Bore is 132.5 mm (5.2 in) and bar capacity 116 mm (4.6 in). Axis motors are 7 kW. The machine weighs 11,200 kg (24,640 lb) and occupies 5,132 x 2,270 mm (202 x 89.4 in).
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 | 800 mm (31.5 in) |
| Rapid Traverse Rate | X: 15 m/min (591 ipm); Y: 10 m/min (394 ipm); Z: 18 m/min (709 ipm) |
| Tailstock Travel | 500 mm (19.7 in) |
| Tailstock Quill Travel | 125 mm (4.9 in) |
| Tailstock Quill Diameter | Ø125 mm (Ø4.9 in) |
| Tailstock Taper | MT#5 |
| Servo Motor X | 7 kW |
| Servo Motor Y Optional | 3 kW |
| Servo Motor Z | 7 kW |
| Bed Inclination | 60° |
| Machine Weight | 11,200 kg (24,640 lb) |
| Machine Dimensions | 5,132 x 2,270 x 2,765 mm (202 x 89.4 x 108.9 in) |
Specifications sourced from johnford.com.tw — verified 2026-10-04
Strengths & Limitations
Strengths
- 700 mm (27.6 in) swing over the cross slide on an 800 mm (31.5 in) bed
- 450 mm (17.7 in) chuck available
- Four automatic speeds to 2,000 rpm
- Optional 30 / 37 kW (40.2 / 49.6 hp) motor
- 370 mm (14.6 in) of X travel on a 7 kW servo motor
Limitations
- Z travel of 800 mm (31.5 in)
- Tailstock travel of 500 mm (19.7 in)
- Standard power is 22 / 26 kW (29.5 / 34.9 hp)
- Spindle speed stops at 2,000 rpm
Best For
Frequently Asked Questions
01
A 381 mm (15 in) 3-jaw hydraulic through-hole chuck is standard and a 450 mm (17.7 in) chuck is the option. Swing is 920 mm (36.2 in) over the bed and 700 mm (27.6 in) over the cross slide.
02
The ST-40B swings 790 mm (31.1 in) over the bed and 600 mm (23.6 in) over the cross slide, with 320 mm (12.6 in) of X travel and 4 kW axis motors. The ST-40BH has the larger swing, 370 mm (14.6 in) of X and 7 kW motors.
03
22 / 26 kW (29.5 / 34.9 hp) as standard and 30 / 37 kW (40.2 / 49.6 hp) as an option, through four automatic speeds to 2,000 rpm.
04
11,200 kg (24,640 lb). Outside dimensions are 5,132 x 2,270 x 2,765 mm (202 x 89.4 x 108.9 in), and the bed is inclined at 60°.
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