Airtac SCJ100 Standard Cylinder SCJ100X25-20STC
The AirTAC Airtac SCJ100 Standard Cylinder SCJ100X25-20STC 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, 25mm nominal stroke, PT1/2 ports and adjustable end cushioning.
- BoreØ100 mm
- Nominal stroke25 mm
- Stroke adjust-20 mm
- Port sizePT1/2
- Rod threadM20×1.5
- CushionAdjustable, 29 mm
About the Airtac SCJ100 Standard Cylinder SCJ100X25-20STC
The SCJ100X25-20STC is a 100 mm bore double-acting single-rod cylinder with a 25 mm nominal stroke and a 20 mm rear adjusting screw for fine-tuning the stroke end position on the machine. At 0.5 MPa it delivers 3927 N push and 3681 N pull, providing substantial force in a compact stroke length for clamping, pressing, or short-stroke positioning tasks.
This model includes a built-in magnet (-S) for direct mounting of CMSG/DMSG/EMSG sensors and a centre trunnion (TC) mount with the TCM1 bracket for pivoting applications. The 25 mm rod runs in a tie-rod body (A length 245 mm) with PT3/8 ports and an adjustable air cushion (29 mm) to decelerate the piston smoothly.
Airtac SCJ100 Standard Cylinder SCJ100X25-20STC Technical Specifications
| Model | Airtac SCJ100 Standard Cylinder SCJ100X25-20STC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø100 mm |
| Nominal stroke | 25 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 SCJ100X25-20STC
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 100 | Bore size in mm. |
| ×25 | 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 SCJ100X25-20STC Is Used
Clamp Force Tuning
The 20 mm adjust range lets operators dial in the exact clamp position on fixtures without changing tooling, compensating for part tolerance variations in automated welding cells.
Short-Stroke Stop Gate
Used as a pneumatic stop on a conveyor line, the rear screw adjusts the gate's extended position to handle different product widths, powered by the cylinder's 3927 N push force.
Press-Fit Depth Control
In a benchtop assembly press, the adjustable stroke end sets the precise insertion depth for bearings or bushings, ensuring consistent assembly quality without mechanical hard stops.
Is the Airtac SCJ100 Standard Cylinder SCJ100X25-20STC the Right Cylinder?
Choose the SCJ100 bore when the 80 mm bore's 2513 N push at 0.5 MPa is insufficient; the step up to 100 mm provides a 56% force increase. If your application does not require field adjustment of the stroke end, the fixed-stroke SC100 cylinder offers a simpler, more compact alternative. For direct replacement, match the bore (100 mm), nominal stroke (25 mm), adjust range (20 mm), PT port thread, TC centre trunnion mounting (F-SC100TC), and the -S magnet option.
With a 25 mm stroke, side-loading is typically minimal, but always ensure the load is guided externally if any off-axis force is present to prevent premature rod bearing wear.
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 SCJ100X25-20STC FAQ
At 0.5 MPa air pressure, the push force is 3927 N and the pull force is 3681 N. The maximum push force at the 0.9 MPa operating limit is 7068 N. Because it is a single-rod cylinder, push force is always higher than pull force.
Yes, if the old cylinder matches the 100 mm bore, 25 mm nominal stroke, 20 mm adjustable range, PT port thread, centre trunnion (TC) mounting, and has a magnet for sensors. The F-SC100TC mounting bracket must also be compatible.
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