Johnford ST-40C
Key Specifications
Max Spindle
Rapid Traverse
Spindle Power
swing over bed
swing over cross slide
chuck size
How much does the Johnford ST-40C cost?
Price estimate
We do not have a price for the Johnford ST-40C 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
The Johnford ST-40C is a short, heavy chucker: a 510 mm (20.1 in) chuck and an A2-15 spindle on a bed with just 800 mm (31.5 in) of Z travel.
One detail of the table deserves attention before anything else. The optional chuck is 610 mm (24 in), and the swing over the cross slide is 600 mm (23.6 in). A chuck that size clears the bed, which swings 790 mm (31.1 in), but the carriage cannot pass under it, so tool reach and jaw positions have to be worked out with that in mind.
The C spindle has a 152 mm (6 in) bore, 139 mm (5.5 in) of bar capacity and a 200 mm (7.9 in) bearing diameter. Standard power is 30 / 37 kW (40.2 / 49.6 hp), with 37 / 45 kW (49.6 / 60.3 hp) as an option. With the belt-type gearbox it runs to 1,500 rpm as standard and 1,400 rpm in the optional version; a geared headstock is also listed, at 1,200 rpm.
On so short a bed the tailstock, with 500 mm (19.7 in) of travel, is secondary. This is a machine for rings, discs, couplings and other parts whose diameter is greater than their length. It weighs 11,150 kg (24,530 lb), against 11,000 kg (24,200 lb) for the ST-40A.
Full Specifications
| Parameter | Value |
|---|---|
| Swing Over Bed | 790 mm (31.1 in) |
| Swing Over Cross Slide | 600 mm (23.6 in) |
| Chuck Size | 510 mm (20.1 in) |
| Chuck Size Optional | 610 mm (24 in) |
| Bar Capacity | 139 mm (5.5 in) |
| Spindle Nose | A2-15 |
| Spindle Bore | 152 mm (6 in) |
| Spindle Transmission | Auto 4 speeds |
| Max Spindle Speed | 1,500 rpm (Std.); 1,400 rpm (Opt.) |
| Spindle Speed Geared Headstock | 1,200 rpm |
| Spindle Motor Power | 30 / 37 kW (40.2 / 49.6 hp) (Std.); 37 / 45 kW (49.6 / 60.3 hp) (Opt.) |
| Spindle Bearing Diameter | 200 mm (7.9 in) |
| Turret Stations | 12 |
| X Axis Travel | 320 mm (12.6 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 | 4 kW |
| Servo Motor Y Optional | 3 kW |
| Servo Motor Z | 4 kW |
| Bed Inclination | 60° |
| Machine Weight | 11,150 kg (24,530 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
- 510 mm (20.1 in) chuck on a machine 5,132 mm (202 in) long
- 30 / 37 kW (40.2 / 49.6 hp) standard, 37 / 45 kW (49.6 / 60.3 hp) optional
- 152 mm (6 in) spindle bore with 139 mm (5.5 in) bar capacity
- Geared headstock listed at 1,200 rpm as an alternative to the belt-type gearbox
- 200 mm (7.9 in) spindle bearing diameter
Limitations
- The optional 610 mm (24 in) chuck is larger than the 600 mm (23.6 in) swing over the cross slide
- Spindle speed is no higher than 1,500 rpm
- 800 mm (31.5 in) of Z travel
- X and Z servo motors are 4 kW
Best For
Frequently Asked Questions
01
A 610 mm (24 in) chuck is the listed option. Swing over the bed is 790 mm (31.1 in), so it fits, but swing over the cross slide is 600 mm (23.6 in), which is less than the chuck diameter.
02
With the belt type gear box, 1,500 rpm as standard and 1,400 rpm as the option. With the geared headstock, 1,200 rpm. The transmission has four automatic speeds.
03
The ST-40B has a 381 mm (15 in) chuck, a 132.5 mm (5.2 in) bore, 2,000 rpm and 22 / 26 kW (29.5 / 34.9 hp) as standard. The ST-40C moves to a 510 mm (20.1 in) chuck, a 152 mm (6 in) bore, 1,500 rpm and 30 / 37 kW (40.2 / 49.6 hp).
04
11,150 kg (24,530 lb), on outside dimensions of 5,132 x 2,270 x 2,765 mm (202 x 89.4 x 108.9 in). The bed is inclined at 60°.
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