Johnford ST-80DH
Key Specifications
Max Spindle
Rapid Traverse
Spindle Power
swing over bed
swing over cross slide
chuck size
How much does the Johnford ST-80DH cost?
Price estimate
We do not have a price for the Johnford ST-80DH 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
Large pipe couplings and similar short, big-bore parts are the work of the Johnford ST-80DH. It has a 185 mm (7.3 in) spindle bore, 800 mm (31.5 in) of swing over the cross slide and 2,000 mm (78.7 in) of Z travel.
The D spindle takes 165 mm (6.5 in) stock through the headstock. Around the chuck, the high frame leaves 1,000 mm (39.4 in) of swing over the bed, so a coupling blank or flange far larger than the 510 mm (20.1 in) chuck body can be gripped in extended jaws and still clear. The optional chuck is 610 mm (24 in).
Internal work dominates on such parts: boring, internal threading, sealing faces. The 420 mm (16.5 in) of X travel lets a stout boring bar reach the center line and retract past the bore wall, and the 240 mm (9.4 in) spindle bearing supports the overhung part.
Speed is 1,000 rpm with either the belt-type gearbox or the geared headstock; the geared version has a 176 mm (6.9 in) bore. Power is 30 / 37 kW (40.2 / 49.6 hp), optionally 37 / 45 kW (49.6 / 60.3 hp). The machine weighs 15,600 kg (34,320 lb).
Full Specifications
| Parameter | Value |
|---|---|
| Swing Over Bed | 1,000 mm (39.4 in) |
| Swing Over Cross Slide | 800 mm (31.5 in) |
| Chuck Size | 510 mm (20.1 in) |
| Chuck Size Optional | 610 mm (24 in) |
| Bar Capacity | 165 mm (6.5 in) |
| Spindle Nose | A2-15 |
| Spindle Bore | 185 mm (7.3 in) / Geared headstock 176 mm (6.9 in) |
| Spindle Transmission | Auto 4 speeds |
| Max Spindle Speed | 1,000 rpm |
| Spindle Speed Geared Headstock | 1,000 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 | 240 mm (9.4 in) |
| Turret Stations | 12 |
| X Axis Travel | 420 mm (16.5 in) |
| Y Axis Travel Optional | ±75 mm (±3 in) |
| Z Axis Travel | 2,000 mm (78.7 in) |
| Rapid Traverse Rate | X: 10 m/min (394 ipm); Y: 10 m/min (394 ipm); Z: 12 m/min (472 ipm) |
| Tailstock Travel | 1,700 mm (66.9 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 | 15,600 kg (34,320 lb) |
| Machine Dimensions | 7,412 x 2,504 x 2,955 mm (291.8 x 98.6 x 116.3 in) |
Specifications sourced from johnford.com.tw — verified 2026-10-04
Strengths & Limitations
Strengths
- 185 mm (7.3 in) bore with 165 mm (6.5 in) bar capacity
- 1,000 mm (39.4 in) swing over the bed, 800 mm (31.5 in) over the cross slide
- 240 mm (9.4 in) spindle bearing diameter
- 420 mm (16.5 in) of X travel for boring bars
- 30 / 37 kW (40.2 / 49.6 hp) or 37 / 45 kW (49.6 / 60.3 hp)
Limitations
- Spindle speed of 1,000 rpm
- Geared headstock bore is 176 mm (6.9 in)
- Machine weight of 15,600 kg (34,320 lb)
- Boring bar holders are optional
Best For
Frequently Asked Questions
01
A 185 mm (7.3 in) bore, or 176 mm (6.9 in) with the geared headstock, and 165 mm (6.5 in) of bar capacity. The nose is A2-15 and the bearing diameter 240 mm (9.4 in).
02
The ST-80D swings 920 mm (36.2 in) over the bed and 700 mm (27.6 in) over the cross slide with 370 mm (14.6 in) of X travel, at 15,500 kg (34,100 lb). The ST-80DH swings 1,000 mm (39.4 in) and 800 mm (31.5 in) with 420 mm (16.5 in) of X, at 15,600 kg (34,320 lb).
03
510 mm (20.1 in) as standard and 610 mm (24 in) as an option. The standard chuck is a 3-jaw hydraulic through-hole type with hard and soft jaws.
04
2,000 mm (78.7 in), with 1,700 mm (66.9 in) of tailstock travel. The machine is 7,412 mm (291.8 in) long and 2,955 mm (116.3 in) high.
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