Airtac SCJ40 Standard Cylinder SCJ40X100-20
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X100-20 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 20 mm range without swapping the cylinder. Ø40mm bore, 100mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke100 mm
- Stroke adjust-20 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X100-20
The SCJ40X100-20 is a double-acting, single-rod pneumatic cylinder from the AirTAC SCJ adjustable-stroke series, offering a 40 mm bore and a nominal 100 mm stroke. A rear-cap adjusting screw provides up to 20 mm of stroke-end reduction, letting you dial in the exact stopping position during commissioning or changeovers without swapping the cylinder. It delivers 628 N of push force and 528 N of pull force at 0.5 MPa, with a 16 mm diameter piston rod and PT1/4 ports.
This tie-rod cylinder uses a TPU seal as standard, rated for -20 to +70 °C, and includes an adjustable air cushion for smooth deceleration. The SCJ body length A is 185 mm, slightly longer than the fixed-stroke SC equivalent to house the adjustment mechanism. It is a genuine AirTAC unit, built for reliable field tuning in compact automation tasks.
Airtac SCJ40 Standard Cylinder SCJ40X100-20 Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X100-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 100 mm |
| Stroke adjustment | Up to 20 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 SCJ40X100-20
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×100 | Nominal (maximum) stroke length in mm. |
| -20 | 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 SCJ40X100-20 Is Used
Commissioning & Set-up
Fine-tune the end-stop position by up to 20 mm during machine bring-up without removing the cylinder, speeding up the alignment of sensors and tooling on assembly fixtures.
Format Changeovers
Adjust the stroke end to accommodate different product sizes on packaging or sorting lines. The screw adjustment allows a quick mechanical change without reprogramming servo axes.
Wear Compensation
Take up mechanical play or seal wear in clamping and pressing mechanisms over time. The 20 mm adjustment range lets operators restore precise contact without replacing components.
Is the Airtac SCJ40 Standard Cylinder SCJ40X100-20 the Right Cylinder?
Choose the SCJ40X100-20 when your application benefits from on-machine stroke fine-tuning within a 20 mm window. If you need more force, step up to the 50 mm bore SCJ50 series, which provides 982 N of push at 0.5 MPa; for a lighter, more compact solution, the 32 mm bore offers 402 N. This adjustable-stroke model is ideal for set-up trials, but if the stroke is permanently fixed after commissioning, a standard SC40X100 fixed-stroke cylinder is a more economical choice. For direct replacement, match the 40 mm bore, 100 mm nominal stroke, 20 mm adjustment range, PT port thread, and basic mounting style.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-20)
- ✓ 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 SCJ40X100-20 FAQ
At the standard operating pressure of 0.5 MPa, this cylinder generates 628 N of push force and 528 N of pull force. The maximum push force at 0.9 MPa is 1130 N. The pull force is lower because the 16 mm piston rod reduces the effective area on the return stroke.
No, the SCJ40X100-20 is a standard double-acting cylinder and will not hold position if air pressure is exhausted or the directional valve is centered. The adjustable air cushion only decelerates the piston at stroke end; it is not a locking device. For load holding without live pressure, you must add an external rod lock or a pilot-operated check valve.
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