Airtac SCJ100 Standard Cylinder SCJ100X40-20
The AirTAC Airtac SCJ100 Standard Cylinder SCJ100X40-20 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. Ø100mm bore, 40mm nominal stroke, PT1/2 ports and adjustable end cushioning.
- BoreØ100 mm
- Nominal stroke40 mm
- Stroke adjust-20 mm
- Port sizePT1/2
- Rod threadM20×1.5
- CushionAdjustable, 29 mm
About the Airtac SCJ100 Standard Cylinder SCJ100X40-20
The SCJ100X40-20 is a double-acting, single-rod pneumatic cylinder from the AirTAC SCJ adjustable-stroke family, delivering a substantial 3927 N of push force at 0.5 MPa (7068 N at 0.9 MPa). A rear-cap adjusting screw provides 20 mm of field-adjustable stroke-end reduction, allowing engineers to fine-tune the piston's stopping position without removing the cylinder or adding external hard stops. The 100 mm bore uses a 25 mm diameter piston rod, PT1/2 ports, and an M20x1.5 rod thread for robust mechanical connection.
With a 29 mm air cushion and a body length A(SCJ) of 245 mm, this genuine AirTAC cylinder is built for reliable deceleration and easy integration into machinery requiring precise end-position tuning. The adjustable stroke is ideal for commissioning, format changeovers, and compensating for tooling wear, all while maintaining the full force capability of a standard SC cylinder of the same bore.
Airtac SCJ100 Standard Cylinder SCJ100X40-20 Technical Specifications
| Model | Airtac SCJ100 Standard Cylinder SCJ100X40-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø100 mm |
| Nominal stroke | 40 mm |
| Stroke adjustment | Up to 20 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT1/2 |
| Rod thread | M20×1.5 |
| 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, 29 mm |
| Max stroke | Up to 1500 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 (Ø100mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 3927 N | 3682 N |
| 0.7 MPa | 5498 N | — |
| Max (@1.0 MPa) | 801 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 SCJ100 Standard Cylinder SCJ100X40-20
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 100 | Bore size in mm. |
| ×40 | 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 SCJ100 Standard Cylinder SCJ100X40-20 Is Used
End-Stop Tuning for Clamping
A high-force clamp in a welding fixture can be precisely dialed in using the 20 mm adjustment screw to accommodate slight variations in workpiece thickness, ensuring consistent clamping pressure without crushing parts.
Product Pusher Adjustment
On a packaging line, the stroke end of a heavy-duty case pusher can be fine-tuned to handle different box sizes during a format changeover, eliminating the need for mechanical stop rework.
Wear Compensation in Press Tools
In a stamping or forming press, the adjustable stroke compensates for gradual tooling wear over thousands of cycles, maintaining the correct final forming depth without replacing the actuator.
Is the Airtac SCJ100 Standard Cylinder SCJ100X40-20 the Right Cylinder?
Choose the SCJ100X40-20 when your application requires a high-force actuator with the flexibility to adjust the stroke end position by up to 20 mm on the machine. If the force is insufficient, stepping up to a 125 mm bore provides 6136 N of push force at 0.5 MPa; if it is excessive, an 80 mm bore delivers 2513 N. For applications where the stroke is fixed and never needs field adjustment, the standard SC100 series offers a simpler, non-adjustable alternative. A direct replacement must match the 100 mm bore, 40 mm nominal stroke, 20 mm adjustable range, PT port thread, and basic mounting configuration. For strokes of 300 mm or more, evaluate side-loading and rod bending; an external guide or a guided cylinder is recommended to protect the rod and seals.
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 SCJ100 Standard Cylinder SCJ100X40-20 FAQ
Being a single-rod cylinder, push and pull forces differ. At 0.5 MPa, the push force is 3927 N and the pull force is 3681 N. At the maximum operating pressure of 0.9 MPa, the push force reaches 7068 N. The theoretical maximum at 1.0 MPa is 801 kgf.
The SCJ has a rear-cap adjusting screw that shortens the stroke end by up to 20 mm from its 40 mm nominal maximum. This is a mechanical stroke-end limiter, not a force or speed control. Choose the SCJ when you need to fine-tune the piston's stopping position on the machine for commissioning, format changes, or wear take-up. If your stroke is fixed and will never need field adjustment, the standard SC series is the appropriate choice.
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