Airtac SCJ100 Standard Cylinder SCJ100X250-75
The AirTAC Airtac SCJ100 Standard Cylinder SCJ100X250-75 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 75 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-75 mm
- Port sizePT1/2
- Rod threadM20×1.5
- CushionAdjustable, 29 mm
About the Airtac SCJ100 Standard Cylinder SCJ100X250-75
The SCJ100X250-75 is a double-acting, single-rod pneumatic cylinder that delivers a substantial 3927 N of push force at 0.5 MPa, making it a workhorse for heavy-duty linear applications. Its defining feature is a rear-cap adjusting screw that provides a 75 mm field-adjustable stroke range, allowing you to fine-tune the stroke end position without removing the cylinder from the machine.
Built on a robust tie-rod design with a 25 mm diameter piston rod and PT1/2 ports, this cylinder is engineered for reliable performance. The 29 mm air cushion at each end decelerates the piston smoothly, protecting the end caps from impact, while the 245 mm body length (A dimension) provides a compact footprint for its 250 mm nominal stroke.
Airtac SCJ100 Standard Cylinder SCJ100X250-75 Technical Specifications
| Model | Airtac SCJ100 Standard Cylinder SCJ100X250-75 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø100 mm |
| Nominal stroke | 250 mm |
| Stroke adjustment | Up to 75 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 SCJ100X250-75
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 100 | Bore size in mm. |
| ×250 | Nominal (maximum) stroke length in mm. |
| -75 | 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 SCJ100X250-75 Is Used
Clamp Force Calibration
In automated welding or assembly fixtures, the 75 mm adjustment range allows operators to precisely set the clamping stroke to accommodate varying part thicknesses or to compensate for electrode wear over time, ensuring consistent clamp force.
Product Diverting & Sorting
For conveyor systems handling different package sizes, the adjustable stroke lets a single SCJ100 actuator serve multiple product lanes. The stroke end can be quickly re-set for a new box width, eliminating the need for mechanical stop changes.
Press-Fit Depth Adjustment
During the setup of a bearing or bushing press, the 75 mm stroke-end screw provides a fine-tuning mechanism to control the final insertion depth. This allows for quick recipe changes between different product models without swapping the cylinder.
Is the Airtac SCJ100 Standard Cylinder SCJ100X250-75 the Right Cylinder?
Select the SCJ100X250-75 when your application demands high force and the ability to dial in the exact stroke end position on-site, such as during commissioning or format changes. If you need more force, step up to the 125 mm bore which provides 6136 N of push force; for a lighter, more compact solution, the 80 mm bore offers 2513 N. This adjustable-stroke model is ideal when the stroke requirement is not yet fixed, but if your stroke is already determined and will not change, a fixed-stroke SC100X250 cylinder is a more economical choice. For a direct replacement, match the 100 mm bore, 250 mm nominal stroke, 75 mm adjust range, and PT port thread.
For this 250 mm stroke, always ensure the rod is guided if it experiences significant side loads to prevent bending and premature seal wear. An external guide rail or switching to a guided cylinder assembly is recommended for non-axial loads.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-75)
- ✓ 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 SCJ100X250-75 FAQ
The adjustment is made via a screw mechanism in the rear end cap. This screw acts as an internal, moveable stop for the piston, allowing you to shorten the stroke end position by up to 75 mm from its maximum of 250 mm. It adjusts the retracted end position, not the extension force or speed.
The theoretical push force at 0.5 MPa is 3927 N, and the pull force on the rod retract is 3681 N. The force is directly proportional to air pressure; at the maximum operating pressure of 1.0 MPa, the push force reaches 7068 N. These values are for a static load; dynamic forces require a safety factor.
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