Airtac SCJ100 Standard Cylinder SCJ100X250-20
The AirTAC Airtac SCJ100 Standard Cylinder SCJ100X250-20 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, 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 SCJ100X250-20
The SCJ100X250-20 is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke, built around a robust 100 mm bore. Its rear-cap adjusting screw provides a 20 mm range to precisely set the stroke end position, making it invaluable for commissioning and format changeovers without swapping the cylinder. At a standard 0.5 MPa operating pressure, it delivers a substantial 3927 N of push force and 3681 N on the pull stroke, driven by a 25 mm diameter piston rod.
This tie-rod cylinder uses a PT1/2 port and an M20x1.5 rod thread for secure, leak-free connections. The body length (A dimension) is 245 mm, and it includes an adjustable air cushion with a 29 mm cushion length to decelerate the piston smoothly at the end of travel. With a maximum standard stroke of 1500 mm for this bore, the 250 mm nominal stroke is well within standard limits, ensuring quick availability.
Airtac SCJ100 Standard Cylinder SCJ100X250-20 Technical Specifications
| Model | Airtac SCJ100 Standard Cylinder SCJ100X250-20 |
|---|---|
| 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 SCJ100X250-20
| 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 SCJ100X250-20 Is Used
Commissioning & Setup
Technicians can dial in the exact 250 mm stroke end-stop during initial machine setup, compensating for mounting bracket tolerances and ensuring perfect alignment with tooling without needing shims or custom spacers.
Product Format Changeover
On a packaging line, the 20 mm adjustment allows operators to quickly reset a pusher or diverter's end position when switching between different product sizes, minimizing downtime between batches.
Clamping & Pressing
In a gluing or pressing station, the screw provides a fine-tuneable hard stop. The 3927 N push force at 0.5 MPa is sufficient for heavy-duty clamping, and the stop can be adjusted to control the final pressed depth with high repeatability.
Is the Airtac SCJ100 Standard Cylinder SCJ100X250-20 the Right Cylinder?
Select the SCJ100X250-20 when you need a high-force actuator with the ability to fine-tune the stroke end on the machine. If your application requires even more force, stepping up to the 125 mm bore provides 6136 N of push at 0.5 MPa. For a simpler, fixed-stroke solution where adjustability is not required, the standard SC100X250 is the direct alternative. A direct replacement must match the 100 mm bore, 250 mm nominal stroke, 20 mm adjustable range, PT port thread, and basic mounting.
For this 250 mm stroke length, be mindful of side loads on the piston rod. If the load is not guided externally, the rod can experience bending moments that reduce seal life. In such cases, use an external guide rail or consider a guided cylinder assembly to absorb the transverse forces and protect the cylinder.
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 SCJ100X250-20 FAQ
At the standard 0.5 MPa operating pressure, the push force is 3927 N and the pull force is 3681 N. The push force is greater because the single piston rod reduces the effective piston area on the pull side. The maximum theoretical force at 1.0 MPa is 801 kgf.
A rear-cap screw allows you to shorten the stroke end by up to 20 mm from its 250 mm nominal maximum. It is a direct upgrade for an SC100X250 if you need field adjustability, provided the port thread (PT), mounting style, and magnet option match. The cylinder does not lock or hold position if air pressure is lost; an external lock is needed for that.
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