Airtac SCJ100 Standard Cylinder SCJ100X250-40S
The AirTAC Airtac SCJ100 Standard Cylinder SCJ100X250-40S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 40 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-40 mm
- Port sizePT1/2
- Rod threadM20×1.5
- CushionAdjustable, 29 mm
About the Airtac SCJ100 Standard Cylinder SCJ100X250-40S
The SCJ100X250-40S is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, letting you fine-tune the 250 mm nominal stroke by up to 40 mm using the rear-cap screw. This 100 mm bore unit delivers a substantial 3927 N of push force at 0.5 MPa, making it a strong candidate for medium-to-heavy linear positioning tasks where the final stop point must be dialed in during commissioning or changeover.
Equipped with a built-in magnet (-S suffix), the cylinder barrel accepts CMSG/DMSG/EMSG reed and solid-state sensors for reliable end-of-stroke detection without external brackets. The tie-rod construction uses a 25 mm piston rod, PT1/2 ports, and a 29 mm air cushion to decelerate the piston smoothly. The body length (A dimension) is 245 mm, and the standard stroke range for this bore extends up to 1500 mm.
Airtac SCJ100 Standard Cylinder SCJ100X250-40S Technical Specifications
| Model | Airtac SCJ100 Standard Cylinder SCJ100X250-40S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø100 mm |
| Nominal stroke | 250 mm |
| Stroke adjustment | Up to 40 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 SCJ100X250-40S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 100 | Bore size in mm. |
| ×250 | Nominal (maximum) stroke length in mm. |
| -40 | 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 SCJ100X250-40S Is Used
Commissioning & Setup
Dial in the exact stop position during machine commissioning without machining custom stops. The 40 mm adjustment range lets technicians fine-tune the 250 mm stroke end on the fly.
Format Changeovers
Quickly adapt a packaging machine's pusher or stop gate to a new product size. The rear screw adjusts the stroke end in seconds, minimizing downtime between production runs.
Wear Compensation
Take up mechanical play or tooling wear in clamping and pressing fixtures. The adjustable stroke end maintains consistent contact pressure and position over the machine's lifecycle.
Is the Airtac SCJ100 Standard Cylinder SCJ100X250-40S the Right Cylinder?
For applications needing a push force around 3927 N at 0.5 MPa, the 100 mm bore is a sweet spot. If your load is lighter, stepping down to an 80 mm bore (2513 N push) can reduce air consumption and physical size. For heavier demands, the 125 mm bore (6136 N push) is the next logical step. This SCJ adjustable-stroke model is the right choice when you need to tweak the stroke end on the machine; if your stroke is fixed and never changes, a standard SC100X250 fixed-stroke cylinder is a simpler, more cost-effective alternative.
As a direct replacement, match the 100 mm bore, 250 mm nominal stroke, and 40 mm adjustment range with PT ports. This model uses a basic mount (no bracket) and includes the -S magnet. For strokes of 250 mm and above, be mindful of side loads on the 25 mm rod; if the load is not perfectly guided, add an external guide rail or switch to a guided cylinder to prevent rod bending and premature seal wear.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-40)
- ✓ 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 SCJ100X250-40S FAQ
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. Because it is a single-rod cylinder, the push force is always greater than the pull force due to the rod area.
Yes, if you need the adjustable stroke feature. The SCJ100X250-40S shares the same 100 mm bore, PT1/2 ports, and tie-rod body as an SC100, but the rear adjusting screw adds length. Ensure your machine has clearance for the longer SCJ body (A=245 mm) and that you need the 40 mm stroke-end adjustment range.
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