Airtac SCJ63 Standard Cylinder SCJ63X250-75S
The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X250-75S 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. Ø63mm bore, 250mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ63 mm
- Nominal stroke250 mm
- Stroke adjust-75 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 28 mm
About the Airtac SCJ63 Standard Cylinder SCJ63X250-75S
The SCJ63X250-75S is a double-acting, single-rod pneumatic cylinder with a 63 mm bore and a nominal stroke of 250 mm, featuring a rear-cap adjusting screw that provides a 75 mm field-adjustable stroke range. This allows engineers to fine-tune the end position without removing the cylinder, delivering a push force of 1559 N at 0.5 MPa and a maximum push of 2805 N at 0.9 MPa operating pressure.
This model includes a built-in magnet, enabling direct mounting of CMSG/DMSG/EMSG reed or solid-state sensors along the tie-rod barrel for precise end-of-stroke detection. The 20 mm piston rod, PT1/4 ports, and a 28 mm air cushion ensure reliable deceleration, while the body length A(SCJ) measures 197 mm, making it a compact solution for dynamic stroke adjustment tasks.
Airtac SCJ63 Standard Cylinder SCJ63X250-75S Technical Specifications
| Model | Airtac SCJ63 Standard Cylinder SCJ63X250-75S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 250 mm |
| Stroke adjustment | Up to 75 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT1/4 |
| Rod thread | M16×1.5 |
| 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, 28 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 (Ø63mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 1559 N | 1402 N |
| 0.7 MPa | 2182 N | — |
| Max (@1.0 MPa) | 318 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 SCJ63 Standard Cylinder SCJ63X250-75S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 63 | 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 SCJ63 Standard Cylinder SCJ63X250-75S Is Used
Commissioning & Setup
The 75 mm screw adjustment allows technicians to dial in the exact stroke end position during machine commissioning, compensating for assembly tolerances without needing to swap out the cylinder or add hard stops.
Product Changeover
On packaging or sorting lines, the adjustable stroke lets operators quickly reset a pusher or diverter's travel for different product sizes, minimizing downtime during batch changes.
Wear Compensation
In clamping or pressing fixtures, the stroke can be incrementally extended over time to compensate for pad or tooling wear, maintaining consistent contact force without reprogramming the machine.
Is the Airtac SCJ63 Standard Cylinder SCJ63X250-75S the Right Cylinder?
Select this 63 mm bore SCJ when you need a mid-range force class with the flexibility to adjust the stroke end by up to 75 mm on the machine, ideal for commissioning or format changes. If more force is required, stepping up to an 80 mm bore provides 2513 N of push at 0.5 MPa; for a lighter, more compact solution, a 50 mm bore delivers 982 N. This adjustable-stroke unit is the correct choice over a fixed-stroke SC when the exact end position must be dialed in after installation.
For a direct replacement, match the SCJ63 bore, 250 mm nominal stroke, 75 mm adjust range, PT port thread, and the -S magnet option. With a 250 mm stroke, ensure the load is guided to prevent excessive side-loading and rod bending; if the application cannot guarantee axial alignment, consider adding an external guide rail or switching to a guided cylinder assembly.
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 SCJ63 Standard Cylinder SCJ63X250-75S FAQ
At the standard 0.5 MPa operating pressure, it produces 1559 N of push force and 1402 N of pull force. The maximum push force at 0.9 MPa is 2805 N. The pull force is lower because the 20 mm piston rod reduces the effective area on the return stroke.
You can replace another AirTAC SCJ63 adjustable-stroke cylinder with the same 250 mm nominal stroke, 75 mm adjust range, PT ports, and magnet option. It is not a direct dimensional swap for a fixed-stroke SC cylinder, as the SCJ body is longer to house the adjusting screw mechanism.
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