Johnford ST-40AH
Key Specifications
Max Spindle
Rapid Traverse
Spindle Power
swing over bed
swing over cross slide
chuck size
How much does the Johnford ST-40AH cost?
Price estimate
We do not have a price for the Johnford ST-40AH 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 H in Johnford ST-40AH stands for a higher frame. Against the plain ST-40A it swings 920 mm (36.2 in) over the bed and 700 mm (27.6 in) over the cross slide, with the same 800 mm (31.5 in) of Z travel.
What is striking is how little else moves. The table gives both machines the same outside dimensions, 5,132 x 2,270 x 2,765 mm (202 x 89.4 x 108.9 in), and the same weight of 11,000 kg (24,200 lb); the ST-40A swings 790 mm (31.1 in) and 600 mm (23.6 in). Two things do change with the frame: X travel goes from 320 mm (12.6 in) on the ST-40A to 370 mm (14.6 in), and the X and Z servo motors from 4 kW to 7 kW.
The spindle is the fast A unit, 3,000 rpm with the standard 304 mm (12 in) chuck and 91 mm (3.6 in) bar capacity. A large swing with a small, fast spindle is an unusual pairing. It fits thin, wide parts such as covers, discs and light housings, held in the optional 381 mm (15 in) chuck or on a fixture, where diameter is large but mass and cutting forces are not.
Rapids stay at 15 m/min on X and 18 m/min on Z. The tailstock has 500 mm (19.7 in) of travel and an MT#5 quill.
Full Specifications
| Parameter | Value |
|---|---|
| Swing Over Bed | 920 mm (36.2 in) |
| Swing Over Cross Slide | 700 mm (27.6 in) |
| Chuck Size | 304 mm (12 in) |
| Chuck Size Optional | 381 mm (15 in) |
| Bar Capacity | 91 mm (3.6 in) (Std.); 102 mm (4 in) (Opt.) |
| Spindle Nose | A2-8 / A2-11 (Opt.) |
| Spindle Bore | 115 mm (4.5 in) |
| Spindle Transmission | Auto Hi-Lo |
| Max Spindle Speed | 3,000 rpm for 12 in (91) chuck; 2,800 rpm for 12 in (102) chuck; 2,500 rpm for 15 in (102) chuck |
| Spindle Motor Power | 22 / 26 kW (29.5 / 34.9 hp) |
| Spindle Bearing Diameter | 160 mm (6.3 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 | 11,000 kg (24,200 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 with a 3,000 rpm spindle
- Same footprint and 11,000 kg (24,200 lb) weight as the ST-40A
- 7 kW servo motors on X and Z
- 370 mm (14.6 in) of X travel
- Rapid traverse of 15 m/min on X and 18 m/min on Z
Limitations
- Standard chuck is 304 mm (12 in), small for the swing
- Only 22 / 26 kW (29.5 / 34.9 hp)
- 800 mm (31.5 in) of Z travel
- Speed is 2,500 rpm with the 15 in chuck
Best For
Frequently Asked Questions
01
Swing, X travel and axis motors. The ST-40A 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 and 4 kW motors. The ST-40AH swings 920 mm (36.2 in) and 700 mm (27.6 in) with 370 mm (14.6 in) of X and 7 kW motors.
02
Not according to the table: both are listed at 5,132 x 2,270 x 2,765 mm (202 x 89.4 x 108.9 in). The ST-40A is also listed at the same 11,000 kg (24,200 lb).
03
The A spindle: A2-8 nose with A2-11 optional, 115 mm (4.5 in) bore, Auto Hi-Lo transmission and 22 / 26 kW (29.5 / 34.9 hp). Speed is 3,000 rpm with the 12 in chuck and 91 mm (3.6 in) bar capacity.
04
A programmable hydraulic tailstock with rotary quill: Ø125 mm (4.9 in) quill, 125 mm (4.9 in) of quill travel, MT#5 taper and 500 mm (19.7 in) of tailstock travel.
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