Johnford ST-100D
Key Specifications
Max Spindle
Rapid Traverse
Spindle Power
swing over bed
swing over cross slide
chuck size
How much does the Johnford ST-100D cost?
Price estimate
We do not have a price for the Johnford ST-100D 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
Pipe work decides for the Johnford ST-100D. It has 165 mm (6.5 in) of bar capacity through a 185 mm (7.3 in) bore and 2,400 mm (94.5 in) of Z travel.
A typical job is a length of pipe that needs a thread or a sealing face on its end. The pipe passes through the spindle and is gripped in the 510 mm (20.1 in) chuck; only the end is in the work zone. For that kind of part the Z travel is used for long bores, long tapers or for parts held between chuck and center, and the 2,100 mm (82.7 in) of tailstock travel serves the second case.
If the pipe is larger than the D spindle allows, Johnford lists bigger spindle bores as an option, with Ø234, Ø318, Ø410 and Ø510 mm named. A geared headstock is also listed; it takes the bore down to 176 mm (6.9 in).
Spindle speed is 1,000 rpm. On pipe diameters that is seldom a restriction, but it does limit surface speed on small turned diameters, so this is not the model for mixed work with small shafts. Weight is 17,000 kg (37,400 lb) and length 7,812 mm (307.6 in).
Full Specifications
| Parameter | Value |
|---|---|
| Swing Over Bed | 920 mm (36.2 in) |
| Swing Over Cross Slide | 700 mm (27.6 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 | 370 mm (14.6 in) |
| Y Axis Travel Optional | ±75 mm (±3 in) |
| Z Axis Travel | 2,400 mm (94.5 in) |
| Rapid Traverse Rate | X: 10 m/min (394 ipm); Y: 10 m/min (394 ipm); Z: 12 m/min (472 ipm) |
| Tailstock Travel | 2,100 mm (82.7 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 | 17,000 kg (37,400 lb) |
| Machine Dimensions | 7,812 x 2,504 x 2,895 mm (307.6 x 98.6 x 114 in) |
Specifications sourced from johnford.com.tw — verified 2026-10-04
Strengths & Limitations
Strengths
- 165 mm (6.5 in) bar capacity through a 185 mm (7.3 in) bore
- 2,400 mm (94.5 in) of Z travel and 2,100 mm (82.7 in) of tailstock travel
- Bigger spindle bores are a listed option
- 240 mm (9.4 in) bearing diameter
- 30 / 37 kW (40.2 / 49.6 hp) standard, 37 / 45 kW (49.6 / 60.3 hp) optional
Limitations
- 1,000 rpm limits surface speed on small diameters
- Bore falls to 176 mm (6.9 in) with the geared headstock
- Machine weight of 17,000 kg (37,400 lb)
- Rapid traverse of 10 m/min on X and 12 m/min on Z
Best For
Frequently Asked Questions
01
Bar capacity is 165 mm (6.5 in) and the bore 185 mm (7.3 in), or 176 mm (6.9 in) with the geared headstock. Bigger spindle bores like Ø234, Ø318, Ø410, Ø510 mm are optional.
02
1,000 rpm, with four automatic speeds. The table gives the same figure for the belt type gear box and for the geared headstock. The motor is 30 / 37 kW (40.2 / 49.6 hp).
03
04
The standard table lists one chuck, 510 mm (20.1 in), or 610 mm (24 in) as an option. A rear chuck is not listed for this model, so support behind the spindle would need to be discussed with Johnford.
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