Airtac SCJ40 Standard Cylinder SCJ40X400-75S
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X400-75S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 75 mm range without swapping the cylinder. Ø40mm bore, 400mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke400 mm
- Stroke adjust-75 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X400-75S
The SCJ40X400-75S is a 40 mm bore double-acting single-rod cylinder with a rear-cap adjusting screw that provides up to 75 mm of field-adjustable stroke reduction. With a 16 mm diameter rod and PT1/4 ports, it delivers 628 N of push force and 528 N of pull force at 0.5 MPa, making it a versatile mid-range actuator for tasks where the stroke end position must be fine-tuned during commissioning or changeover without replacing the cylinder.
This model includes a built-in magnet (suffix -S), allowing direct mounting of CMSG, DMSG, or EMSG reed and solid-state sensors on the barrel for reliable end-of-stroke detection. The body length A(SCJ) is 185 mm, and the pneumatic cushion length is 21 mm, providing smooth deceleration. The operating pressure range is 0.15–1.0 MPa, with a proof pressure of 1.5 MPa.
Airtac SCJ40 Standard Cylinder SCJ40X400-75S Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X400-75S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 400 mm |
| Stroke adjustment | Up to 75 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT1/4 |
| Rod thread | M12×1.25 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Adjustable, 21 mm |
| Max stroke | Up to 1200 mm |
Specifications follow the official AirTAC SCJ (adjustable-stroke) datasheet. The rear adjusting screw sets the stroke end position; force is the same as the equivalent single-rod SC bore. Confirm against the product label before installation. Thread options: PT (standard) / G.
Theoretical Output Force (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
SCJ is single-rod, so force matches the equivalent SC bore: push uses the full bore area, pull subtracts the rod area. Actual usable force is lower than theoretical due to friction and back-pressure; size with a safety margin.
Model Code: Airtac SCJ40 Standard Cylinder SCJ40X400-75S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×400 | Nominal (maximum) stroke length in mm. |
| -75 | Adjustable-stroke range in mm (options 10/20/30/40/50/75/100). |
| -S | Optional built-in magnet for sensor position sensing. |
Related types: SC (single rod, fixed stroke), SCD (double rod), SCT (multi-position). SCJ mounting: Basic, FA, LB, TC, TCM1. Seals: TPU standard / H = Viton / N = NBR. Thread: blank = PT, G = G thread.
Where the Airtac SCJ40 Standard Cylinder SCJ40X400-75S Is Used
Multi-Product Assembly Jigs
The 75 mm adjust range allows a single cylinder to set different press-fit depths for various product variants on an assembly line, eliminating the need for mechanical shims or multiple fixed-stroke cylinders.
Material Feeding & Stopping
Fine-tune the stop position of a material gate or pusher for different box or panel sizes. The built-in magnet provides precise end-of-stroke feedback to the PLC via a DMSG sensor.
Commissioning & Process Tuning
During initial machine setup, the stroke can be precisely dialed in from 325 mm to 400 mm to optimize actuator travel for a new process, then locked in place, speeding up commissioning time.
Is the Airtac SCJ40 Standard Cylinder SCJ40X400-75S the Right Cylinder?
Choose this 40 mm bore when the 628 N push force at 0.5 MPa meets the application need; it is a step up from the 32 mm bore (402 N push) and a step below the 50 mm bore (982 N push). The 75 mm adjustable range is ideal for processes requiring significant stroke-end variation, such as accommodating different part depths or tooling setups. If a fixed, non-adjustable stroke is sufficient, consider the standard SC series. For this 400 mm stroke, evaluate side-load conditions; an external guide rail or a guided cylinder is recommended if the rod is subjected to significant radial forces to prevent bending and premature seal wear.
As a direct replacement, match an AirTAC SCJ cylinder with a 40 mm bore, 400 mm nominal stroke, a -75 adjustable range, PT ports, basic mounting, and a built-in magnet (-S). This model uses the standard TPU seal material, suitable for a -20 to +70 °C temperature range.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-75)
- ✓ Required force at your working pressure
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Set the rear adjusting screw, then lock it before running.
- check Adjust end cushion screws for smooth stops.
- check Use SCJ mounting accessory (FA / LB / TC / TCM1).
- check Installation by qualified personnel per AirTAC docs.
Airtac SCJ40 Standard Cylinder SCJ40X400-75S FAQ
The theoretical push force at 0.5 MPa is 628 N, and the pull force is 528 N (due to the 16 mm rod area). At the maximum operating pressure of 1.0 MPa, the push force reaches 1130 N. The rear adjusting screw only changes the stroke end position and does not alter the cylinder's force output.
Yes, this SCJ40X400-75S is a direct replacement for any AirTAC SCJ40 cylinder with a 400 mm nominal stroke, a -75 adjustable range, PT ports, basic mounting, and a magnet. Ensure the adjustable range, mounting style, and sensor compatibility match your existing setup.
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