Airtac SCJ100 Standard Cylinder SCJ100X250-20S
The AirTAC Airtac SCJ100 Standard Cylinder SCJ100X250-20S 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, 250mm nominal stroke, PT1/2 ports and adjustable end cushioning.
- BoreØ100 mm
- Nominal stroke250 mm
- Stroke adjust-20 mm
- Port sizePT1/2
- Rod threadM20×1.5
- CushionAdjustable, 29 mm
About the Airtac SCJ100 Standard Cylinder SCJ100X250-20S
The SCJ100X250-20S is a double-acting, single-rod pneumatic cylinder with a 100 mm bore and a 250 mm nominal stroke, offering up to 20 mm of field-adjustable stroke-end reduction via a rear-cap screw. This model delivers a substantial 3927 N of push force at 0.5 MPa, making it a robust actuator for medium-to-heavy industrial tasks. The built-in magnet (denoted by the -S suffix) allows direct mounting of CMSG/DMSG/EMSG sensors along the tie-rod barrel for reliable end-of-stroke detection.
With a 25 mm piston rod and PT1/2 ports, this cylinder is designed for filtered air systems operating between 0.15 and 1.0 MPa. The 29 mm air cushion at each end decelerates the piston, protecting the end caps during high-cycle operation. Its body length A(SCJ) is 245 mm, and the adjustable stroke feature is ideal for commissioning fine-tuning, format changeovers, or compensating for tooling wear without replacing the entire cylinder.
Airtac SCJ100 Standard Cylinder SCJ100X250-20S Technical Specifications
| Model | Airtac SCJ100 Standard Cylinder SCJ100X250-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø100 mm |
| Nominal stroke | 250 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 SCJ100X250-20S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 100 | Bore size in mm. |
| ×250 | 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 SCJ100X250-20S Is Used
Commissioning & Setup
Field technicians can precisely dial in the retract stroke end position on a new assembly line without modifying hard stops, saving hours of mechanical adjustment during machine bring-up.
Product Format Changeover
On packaging lines, the 20 mm adjustment range allows operators to quickly reset the stroke for different box sizes or pallet patterns, minimizing downtime between production runs.
Wear Compensation
In clamping or pressing fixtures, the stroke can be incrementally shortened over time to compensate for pad or tooling wear, maintaining consistent clamp force without replacing the actuator.
Is the Airtac SCJ100 Standard Cylinder SCJ100X250-20S the Right Cylinder?
Choose the SCJ100X250-20S when you need a powerful push force in the 4000 N class at standard plant pressure and require the flexibility to fine-tune the stroke end position by up to 20 mm. If your force requirement is lower, stepping down to the 80 mm bore (2513 N push at 0.5 MPa) can reduce air consumption and physical size. For applications where the stroke is fixed and never needs adjustment, the standard SC100X250 fixed-stroke cylinder is a more economical choice. As a direct replacement, match the 100 mm bore, 250 mm nominal stroke, 20 mm adjust range, PT port thread, and the built-in magnet configuration. For strokes of 300 mm or more, be mindful of side-loading on the 25 mm rod; an external guide or a guided cylinder is recommended to prevent rod bending and premature seal 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 SCJ100X250-20S FAQ
The push force is 3927 N at 0.5 MPa and 7068 N at the maximum operating pressure of 0.9 MPa. The pull force is lower due to the single 25 mm rod, providing 3681 N at 0.5 MPa. Always size your cylinder based on the required force at your specific operating pressure.
Yes, it is a direct dimensional replacement for an SC100 of the same nominal stroke, provided you have clearance for the rear adjusting screw. The SCJ100X250-20S offers the added benefit of a 20 mm stroke-end adjustment range. Ensure your mounting (basic in this case), port thread (PT), and magnet option (-S) match your existing setup.
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